CN105677366B - The method that Infinite Cyclic rolls selection is realized based on UITableView in iOS system - Google Patents
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Abstract
The invention discloses a kind of based on the method that UITableView realization Infinite Cyclic rolls selection in iOS system, creates UITableView and view controller and is loaded, adds two agencies；Two NSMutableArray are added, save the data source for needing initial data and UITableView to be shown respectively；Add the variation of the data object quantity in integer variable record rolling process and the change in location of selected object；UITableView data source is set, all variables are initialized；Setting sliding rate of deceleration, closes both ends elastic effect, its dataSource is arranged；Corresponding method, the more value of the variable of new record scrolling position information are rewritten in view controller, updates UITableView data source, refresh the interface UI.The present invention realizes the circulating rolling function of UITableView List View.
Description
Technical field
Embodiments of the present invention are related to computer technology and field of software development, more specifically, embodiment party of the invention
Formula is related to a kind of method for realizing that Infinite Cyclic rolls selection based on UITableView in iOS system.
Background technique
With the high speed development of internet and mobile application technology, smart phone and mobile application produce people's lives
Far-reaching influence is given birth to, being related to field includes each side in browsing internet, traffic, house property information, shopping, smart home etc.
Face, it may be said that mobile application is controlling daily life.Since Apple Inc.'s release iOS7 system in 2013, it is
System style flattening, causes the trend of a burst of human-computer interaction style transformation, and simultaneous user recognizes interactive interface
It is promoted, hommization, flattening, diversification, dynamic and visual, ultimate attainment smooth interaction are increasingly subject to people's favor.
During using UITableView for iOS system progress software development, although it, which is supplied to developer, to roll
List View, but it can not provide circulating rolling function, when for when selecting object data amount huger, sometimes
Need to realize one can satisfy can quickly be selected when user slides into bottom top cell object, due to primary
TableView is unable to circulating rolling, so only manually sliding into top again, this greatly reduces the experience of user.Nothing
By being that newest iOS9 system or pervious iOS version all have such functional defect.
Summary of the invention
Technical problem solved by the invention is that iOS system cannot provide the List View with circulating rolling function, when
User can only manually slide into top again when list is slided into bottom, greatly reduce the experience of user.And roll view
The rolling rate of figure can delay very much the update of dataSource to load fastly, influence very much user experience slowly.It is to be shown right due to needing
As quantity difference, the data amount check selection of the dataSource of UITableView is problematic, and number selection will increase too much is answered
It is born, and will lead to very little using Caton with memory.In order to realize circulating rolling, chosen after needing to record current scrolling
Position, the more new demand of data source is rapid and accurate during scrolling, especially data interface portion end to end, updates not in time
It will appear application interface Caton or display mistake.
In order to solve the above technical problems, an embodiment of the present invention adopts the following technical solutions:
A method of realizing that Infinite Cyclic rolls selection based on UITableView in iOS system, it includes following step
It is rapid:
Step 1: first creating a type and be the UITableView of Plain, then create a view controller, then exist
Load the UITableView of creation in view controller, and add act on behalf of UITableViewDataSource,
UITableViewDelegate；
Step 2: two NSMutableArray of addition, wherein first preservation need initial data to be shown, second
For the data source of UITableView；
Step 3: five integer variables of overall importance of addition record the variation of the data object quantity in entire rolling process
And the change in location of selected object；
Step 4: the data source of UITableView is set in viewDidLoad method according to initial data quantity, initially
Change all variables in step 3；
Step 5: the sliding rate of deceleration of UITableView being set, close both ends elastic effect, and it is set
dataSource；
Step 6: scrollViewDidEndDragging:willDecelerate is rewritten in view controller: and
ScrollViewDidEndDecelerating: method, the more value of the variable of new record scrolling position information；
Step 7: according to the variation of the value of correlated variables in step 6, updating the data source of UITableView, refresh UI circle
Face can be completed and realize that Infinite Cyclic rolls selection function using UITableView.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, described in step 2
Two NSMutableArray are substituted with NSArray.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, five described in step 3
A integer variable of overall importance is at least one of the variable for having global modification and reading characteristic.
It is above-mentioned based in iOS system UITableView realize Infinite Cyclic roll in the method for selection, the step 4 and
The specific steps of step 5 are as follows:
(1) allDataArray, dataSourceArray, allDataArrayCount are initialized；
(2) allDataArrayCount is judged, if passing through method addObjectsFromArray less than 99: repeating
The data in allDataArray are loaded, update the value of allDataArrayCount until it is greater than 99；
(3) setting defaultIndex is that middle position i.e. 49, selectedObjectAtAllDataArrayIndex is
2, dataSourceArrayCount 99, pass through method setContentOffset: the offest that tableView is arranged is
(0,60*abs(defaultIndex-2))；
(4) updateTableViewDatasource method is called, the data source of tableView is updated
dataSourceArray；
(5) be arranged tableView bounces be NO, decelerationRate 0.3, delegate and
DataSource is self, and tableView is loaded on viewController.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, described in step 6
ScrollViewDidEndDragging:willDecelerate: the realization step of method are as follows:
(1) when decelerate is NO, judge whether scrollView.contentOffset.y%60 is greater than 30, if
It is (0, ((scrollView.contentOffset.y)/60+ greater than the value that scrollView.contentOffset is then arranged
1) (0, ((scrollView.contentOffset.y)/60) * 60 * 60), are otherwise provided as；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, increases one newly
A int type temporary variable newSelectedObjectIndex, value selectedObjectAtAllDataArrayIndex
+(currentIndex-defaultIndex)；When newSelectedObjectIndex has been greater than the element number of initial data
When allDataArrayCount -1, the value for updating selectedObjectAtAllDataArrayIndex is
NewSelectedObjectIndex-allDataArrayCount, if be not more than and newSelectedObjectIndex
Less than 0, then selectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView, updates tableView's
Data source and the interface UI.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, described in step 6
ScrollViewDidEndDecelerating: the realization step of method are as follows:
(1) when scrollView.dragging is NO, whether judge scrollView.contentOffset.y%60
Greater than 30, if more than be then arranged scrollView.contentOffset value be (0,
((scrollView.contentOffset.y)/60+1) * 60), be otherwise provided as (0,
((scrollView.contentOffset.y)/60)*60；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, increases one newly
A int type temporary variable newSelectedObjectIndex, value selectedObjectAtAllDataArrayIndex
+(currentIndex-defaultIndex)；When newSelectedObjectIndex has been greater than the element number of initial data
When allDataArrayCount -1, the value for updating selectedObjectAtAllDataArrayIndex is
NewSelectedObjectIndex-allDataArrayCount, if be not more than and newSelectedObjectIndex
Less than 0, then selectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView, updates tableView's
Data source and the interface UI.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, it is described
The realization step of updateTableViewDatasource method are as follows:
(1) all the elements object of dataSourceArray is removed；
(2) it is recycled using for, cyclic variable i is decremented to 0 from defaultIndex, adds again to dataSourceArray
Add preceding part object elements, in loop body use three integer temporary variables: offestIndex, sumIndex and
TheObjectAtAllDataArrayIndex, offestIndex value are defaultIndex-i, and sumIndex value is
selectedObjectAtAllDataArrayIndex–offestIndex；When sumIndex is less than 0,
The value of theObjectAtAllDataArrayIndex is allDataArrayCount+sumIndex, otherwise its value is
sumIndex；The theObjectAtAllDataArrayIndex object in allDataArray is finally passed through into method
InsertObject:atIndex: it is inserted into the position that index is 0 in dataSourceArray；
(3) reuse for recycle added again to dataSourceArray after part object elements, cyclic variable j from
DefaultIndex+1 is incremented to dataSourceArrayCount -1, and two integer temporary variables are stated in loop body
The value of sumIndex and theObjectAtAllDataArrayIndex, sumIndex are j-defaultIndex+
SelectedObjectAtAllDataArrayIndex, when sumIndex is greater than allDataArrayCount -1,
The value of theObjectAtAllDataArrayIndex is sumIndex- (allDataArrayCount-1) -1, otherwise its value is
SumIndex finally adds the in allDataArray to dataSourceArray by addObject
TheObjectAtAllDataArrayIndex object.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, it is described
The realization step of updateTableView method are as follows:
(1) reloadData method is sent to tableView, reloads the data in tableView data source；
(2) send setContentOffset:animated to tableView: it is (0,60*abs that offest, which is arranged, in method
(defaultIndex-2)), animation effect animated therein is NO.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, the Infinite Cyclic
Roll selection refer to the last one data object being rolled in initial data after still be able to continue to roll, it is subsequent will be from first
Data object continues to roll according to specified sequence.
It is above-mentioned to realize that Infinite Cyclic rolls in the method for selection based on UITableView in iOS system, the life of the variable
Name is not limited to above-mentioned variable naming only for facilitating vivid explanation.
Compared with prior art, beneficial effects of the present invention first is that: the present invention provides one kind based in iOS system
The method that UITableView realizes circulating rolling selection menu, not by showing on mobile device screen interface
The cell number of UITableView influences, and allows user can be in the more situation of number of objects to be selected of list quickly
It is rolled to the position of the object of desired selection, reduces the unnecessary slide of user, solving UITableView cannot recycle
It rolls there is no the objective object for showing and choosing, UIPickerView is unable to the problem of plane circulation rolls, obtains software design
It is more humanized, improve the experience of user.
Detailed description of the invention
Fig. 1 is to realize that Infinite Cyclic rolls the process of the method for selection the present invention is based on UITableView in iOS system
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment
All it is that data source is fixed for UITableView under normal conditions, carries out data displaying by scrolling up and down
, it then has been found that its data source changes in real time with rolling, changes its deviant after sliding, then this
UITableView can be carried out Infinite Cyclic and roll, and the initial position of UITableView is allowed to be displaced to entire content first
Middle section, scroll up and down it initially can, then pass through two Proxy Methods
ScrollViewDidEndDragging:willDecelerate: and scrollViewDidEndDecelerating:, it is rolling
Its data source is updated immediately after dynamic, resets deviant, after refreshing the interface UI, transforms to UITableView rolling
The interface that active user sees, and these users be all it is imperceptible, user just can be allowed to feel that this UITableView can
With the rolling of Infinite Cyclic.
The present invention realizes the operating procedure that UITableView Infinite Cyclic rolls as shown in Figure 1, mainly including following step
It is rapid: step 1: creating a type first and be the UITableView of Plain, then create a view controller, in view control
Load the UITableView of creation on device, and add act on behalf of UITableViewDataSource,
UITableViewDelegate；Step 2: two NSMutableArray of addition, wherein first preservation need to be to be shown original
Data, second data source for UITableView；Step 3: five integer variables of overall importance of addition record entire roll
The variation of data object quantity in the process and the change in location of selected object；Step 4: the root in viewDidLoad method
The data source of UITableView, all variables in initialization step 3 are set according to initial data quantity；Step 5: setting
The sliding rate of deceleration of UITableView closes both ends elastic effect, and its dataSource is arranged；Step 6: in view
ScrollViewDidEndDragging:willDecelerate is rewritten in controller: and
ScrollViewDidEndDecelerating: method, the more value of the variable of new record scrolling position information；Step 7: according to step
The variation of the value of correlated variables in rapid 6 updates the data source of UITableView, refreshes the interface UI, use can be completed
UITableView realizes that Infinite Cyclic rolls selection function.
Below above-mentioned each step is carried out being more clear complete description.
Step 1: a new engineering is created in Xcode, creates a view controller (UIViewController),
It is created in this view controller and loads UITableView example tableView, a type Plain, and add generation
Manage UITableViewDataSource, UITableViewDelegate.
Step 2: two variable data arrays (NSMutableArray) are added under view controller, one of save is owned
Data object allDataArray, another be tableView data source dataSourceArray.
Step 3: added under view controller 5 integer variables of overall importance shaped like: defaultIndex,
currentIndex、selectedObjectAtAllDataArrayIndex、allDataArrayCount、
DataSourceArrayCount, wherein defaultIndex indicates that current selected object exists before sliding occurs
Position in dataSourceArray, current selected object is in dataSourceArray after currentIndex indicates sliding
Position, selectedObjectAtAllDataArrayIndex indicate institute's selected object in initial data allDataArray
In position, require to update this value after each sliding, allDataArrayCount indicates all data objects
Number, dataSourceArrayCount then indicate the data object number of the dataSource of tableView, the two are mainly used
In the correctness for guaranteeing that data are shown.
Step 4: the data source of tableView being set in viewDidLoad method and assigns initial value to each variable, is
It allows the rolling and the data correctness for keeping rolling process that tableView can be smooth, needs to guarantee
DataSourceArrayCount be equal to 99, if the object number of allDataArray less than 99, then only needing to be repeated
Load, the specific method is as follows:
(1) allDataArray, dataSourceArray, allDataArrayCount are initialized；
(2) allDataArrayCount is judged, if passing through method addObjectsFromArray less than 99: repeating
The data in allDataArray are loaded, update the value of allDataArrayCount until it is greater than 99；
(3) when allDataArrayCount is greater than 99, setting defaultIndex is middle position i.e. 49,
SelectedObjectAtAllDataArrayIndex is 2, dataSourceArrayCount 99, passes through method
SetContentOffset: the offest that tableView is arranged is (0,60*abs (defaultIndex-2))；
(4) updateTableViewDatasource method is called, the data source of tableView is updated
dataSourceArray；
(5) be arranged tableView bounces be NO, decelerationRate 0.3, delegate and
DataSource is self, and preferably tableView is loaded on viewController.
Step 5: configuration tableView has carried out the part attribute setting of tableView in step s 4, including has closed
Closing both ends elastic effect setting bounces is no, and the rate of deceleration decelerationRate that rolling is arranged is 0.3, setting
Delegate and dataSource is view controller where UITableView；It needs to pass through later
NumberOfSectionsInTableView: the method setting TableView of UITableViewDataSource only has 1
Section passes through method tableView:numberOfRowsInSection: be arranged tableView cell number be _
DataSourceArray.count passes through the tableView of UITableViewDelegate:
HeightForRowAtIndexPath: the height that cell is arranged in method is 1/5th of tableView height, passes through method
TableView:cellForRowAtIndexPath: the content of each cell is configured.
Step 6 includes step 6-1 and step 6-2, as follows:
Step 6-1: rewriteeing scrollViewDidEndDragging:willDecelerate: method, guarantees
TableView can timely update data source when rolling at a slow speed, obtain current selected object by the deviant after sliding first
Position currentIndex in data source can be obtained further according to the position defaultIndex of previously stored last time
It, finally can be again to current selected object in the position selectedObjectAtAllDataArrayIndex of initial data
The new data source dataSourceArray of tableView is obtained, scrollViewDidEndDragging is rewritten:
WillDecelerate: method is specific as follows:
(1) when decelerate is NO, judge whether scrollView.contentOffset.y%60 is greater than 30, if
It is (0, ((scrollView.contentOffset.y)/60+ greater than the value that scrollView.contentOffset is then arranged
1) (0, ((scrollView.contentOffset.y)/60) * 60 * 60), are otherwise provided as；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, can increase newly
One int type temporary variable newSelectedObjectIndex, value are
selectedObjectAtAllDataArrayIndex+(currentIndex-defaultIndex)；When
When newSelectedObjectIndex has been greater than the element number allDataArrayCount -1 of initial data, update
The value of selectedObjectAtAllDataArrayIndex is newSelectedObjectIndex-
AllDataArrayCount, if newSelectedObjectIndex is not more than the element number of initial data
AllDataArrayCount -1 and newSelectedObjectIndex is less than 0, then
SelectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView, updates tableView's
Data source and the interface UI.
Step 6-2: it is similar with step 6-1, scrollViewDidEndDecelerating: method is rewritten, when
TableView obtains new currentIndex in quick sliding, according to the defaultIndex of preservation, can be obtained and works as
Preceding selected object can finally be retrieved in the position selectedObjectAtAllDataArrayIndex of initial data
TableView new data source dataSourceArray, rewrite scrollViewDidEndDecelerating: method is as follows:
(1) when scrollView.dragging is NO, whether judge scrollView.contentOffset.y%60
Greater than 30, if more than be then arranged scrollView.contentOffset value be (0,
((scrollView.contentOffset.y)/60+1) * 60), be otherwise provided as (0,
((scrollView.contentOffset.y)/60)*60；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, can increase newly
One int type temporary variable newSelectedObjectIndex, value are
selectedObjectAtAllDataArrayIndex+(currentIndex-defaultIndex)；When
When newSelectedObjectIndex has been greater than the element number allDataArrayCount -1 of initial data, update
The value of selectedObjectAtAllDataArrayIndex is newSelectedObjectIndex-
AllDataArrayCount, if newSelectedObjectIndex is not more than the element number of initial data
AllDataArrayCount -1 and newSelectedObjectIndex is less than 0, then
SelectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView, updates tableView's
Data source and the interface UI.
Above-mentioned steps 4, step 6, step 7 have invoked method updateTableViewDatasource, to update
TableVide data source dataSourceArray, method updateTableViewDatasource are implemented as follows:
(1) all the elements object of dataSourceArray is removed；
(2) it is recycled using for, cyclic variable i is decremented to 0 from defaultIndex, adds again to dataSourceArray
Add preceding part object elements, in loop body use three integer temporary variables: offestIndex, sumIndex and
TheObjectAtAllDataArrayIndex, offestIndex value are defaultIndex-i, and sumIndex value is
selectedObjectAtAllDataArrayIndex–offestIndex；When sumIndex is less than 0,
The value of theObjectAtAllDataArrayIndex is allDataArrayCount+sumIndex, otherwise its value is
sumIndex；The theObjectAtAllDataArrayIndex object in allDataArray is finally passed through into method
InsertObject:atIndex: it is inserted into the position that index is 0 in dataSourceArray；
(3) reuse for recycle added again to dataSourceArray after part object elements, cyclic variable j from
DefaultIndex+1 is incremented to dataSourceArrayCount -1, and two integer temporary variables are stated in loop body
The value of sumIndex and theObjectAtAllDataArrayIndex, sumIndex are j-defaultIndex+
SelectedObjectAtAllDataArrayIndex, when sumIndex is greater than allDataArrayCount -1,
The value of theObjectAtAllDataArrayIndex is sumIndex- (allDataArrayCount-1) -1, otherwise its value is
SumIndex finally adds the in allDataArray to dataSourceArray by addObject
TheObjectAtAllDataArrayIndex object.
The method updateTableView that above-mentioned steps 6-1 and step 6-2 are called, to refresh the interface UI, method
UpdateTableView is implemented as follows:
(1) reloadData method is sent to tableView, reloads the data in tableView data source；
(2) send setContentOffset:animated to tableView: it is (0,60*abs that offest, which is arranged, in method
(defaultIndex-2)), animation effect animated therein is NO.
Step 7: according to the variation of the value of correlated variables in step 6, updating the data source of UITableView, refresh UI circle
Face can be completed and realize that Infinite Cyclic rolls selection function using UITableView.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, however, it is to be understood that ability
Field technique personnel can be designed that a lot of other modification and implementations, these modifications and implementations will fall in the application public affairs
Within the scope and spirit opened.It more specifically, can be to the group of theme combination layout in range disclosed in the present application
A variety of variations and modifications are carried out at component and/or layout.In addition to variations and improvements to the component parts and or layout,
To those skilled in the art, other purposes also will be apparent.
Claims (4)
1. a kind of method for realizing that Infinite Cyclic rolls selection based on UITableView in iOS system, it is characterised in that it includes
Following steps:
Step 1: first creating a type and be the UITableView of Plain, then create a view controller, then in view
Load the UITableView of creation on controller, and add act on behalf of UITableViewDataSource,
UITableViewDelegate；
Step 2: two NSMutableArray of addition, wherein first preservation needs initial data to be shown, second is
The data source of UITableView；
Step 3: addition five integer variables of overall importance, record the data object quantity in entire rolling process variation and by
The change in location of selected object；
Step 4: the data source of UITableView, initialization step are set in viewDidLoad method according to initial data quantity
All variables in rapid 3；
Step 5: the sliding rate of deceleration of UITableView being set, close both ends elastic effect, and it is set
dataSource；
Step 6: scrollViewDidEndDragging:willDecelerate is rewritten in view controller: and
ScrollViewDidEndDecelerating: method, the more value of the variable of new record scrolling position information；
Step 7: according to the variation of the value of correlated variables in step 6, updating the data source of UITableView, refresh the interface UI, i.e.,
It is achievable to realize that Infinite Cyclic rolls selection function using UITableView；The specific steps of step 4 and step 5 are as follows:
(1) allDataArray, dataSourceArray, allDataArrayCount are initialized；
(2) allDataArrayCount is judged, if passing through method addObjectsFromArray less than 99: repeating to load
Data in allDataArray update the value of allDataArrayCount until it is greater than 99；
(3) setting defaultIndex is i.e. 49, the selectedObjectAtAllDataArrayIndex in middle position 2,
DataSourceArrayCount is 99, passes through method setContentOffset: be arranged tableView offest be (0,
60*abs(defaultIndex-2))；
(4) updateTableViewDatasource method is called, the data source of tableView is updated
dataSourceArray；The realization step of the updateTableViewDatasource method are as follows:
(a) all the elements object of dataSourceArray is removed；
(b) it is recycled using for, cyclic variable i is decremented to 0 from defaultIndex, before adding again to dataSourceArray
Partial objects element, in loop body use three integer temporary variables: offestIndex, sumIndex and
TheObjectAtAllDataArrayIndex, offestIndex value are defaultIndex-i, and sumIndex value is
selectedObjectAtAllDataArrayIndex–offestIndex；When sumIndex is less than 0,
The value of theObjectAtAllDataArrayIndex is allDataArrayCount+sumIndex, otherwise its value is
sumIndex；The theObjectAtAllDataArrayIndex object in allDataArray is finally passed through into method
InsertObject:atIndex: it is inserted into the position that index is 0 in dataSourceArray；
(c) reuse for recycle added again to dataSourceArray after part object elements, cyclic variable j from
DefaultIndex+1 is incremented to dataSourceArrayCount -1, and two integer temporary variables are stated in loop body
The value of sumIndex and theObjectAtAllDataArrayIndex, sumIndex are j-defaultIndex+
SelectedObjectAtAllDataArrayIndex, when sumIndex is greater than allDataArrayCount -1,
The value of theObjectAtAllDataArrayIndex is sumIndex- (allDataArrayCount-1) -1, otherwise its value is
SumIndex finally adds the in allDataArray to dataSourceArray by addObject
TheObjectAtAllDataArrayIndex object；
(5) bounces that tableView is arranged is NO, decelerationRate 0.3, delegate and dataSource
For self, tableView is loaded on viewController；
ScrollViewDidEndDragging:willDecelerate described in step 6: the realization step of method are as follows:
(1) when decelerate is NO, judge whether scrollView.contentOffset.y%60 is greater than 30, if more than
The value that scrollView.contentOffset is then arranged is (0, ((scrollView.contentOffset.y)/60+1) *
60) (0, ((scrollView.contentOffset.y)/60) * 60, are otherwise provided as；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, increases one newly
Int type temporary variable newSelectedObjectIndex, value selectedObjectAtAllDataArrayIndex+
(currentIndex-defaultIndex)；When newSelectedObjectIndex has been greater than the element number of initial data
When allDataArrayCount -1, the value for updating selectedObjectAtAllDataArrayIndex is
NewSelectedObjectIndex-allDataArrayCount, if be not more than and newSelectedObjectIndex
Less than 0, then selectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView updates the data of tableView
Source and the interface UI；The realization step of the updateTableView method are as follows:
(a) reloadData method is sent to tableView, reloads the data in tableView data source；
(b) send setContentOffset:animated to tableView: it is (0,60*abs that offest, which is arranged, in method
(defaultIndex-2)), animation effect animated therein is NO；
ScrollViewDidEndDecelerating described in step 6: the realization step of method are as follows:
(1) when scrollView.dragging is NO, judge whether scrollView.contentOffset.y%60 is greater than
30, if more than be then arranged scrollView.contentOffset value be (0,
((scrollView.contentOffset.y)/60+1) * 60), be otherwise provided as (0,
((scrollView.contentOffset.y)/60)*60；
(2) value for updating currentIndex is scrollView.contentOffset.y/60+2；
(3) it obtains tableView has rolled how many row according to the value of currentIndex and defaultIndex, increases one newly
Int type temporary variable newSelectedObjectIndex, value selectedObjectAtAllDataArrayIndex+
(currentIndex-defaultIndex)；When newSelectedObjectIndex has been greater than the element number of initial data
When allDataArrayCount -1, the value for updating selectedObjectAtAllDataArrayIndex is
NewSelectedObjectIndex-allDataArrayCount, if be not more than and newSelectedObjectIndex
Less than 0, then selectedObjectAtAllDataArrayIndex value is allDataArrayCount+
NewSelectedObjectIndex, otherwise value is newSelectedObjectIndex；
(4) call method updateTableViewDatasource and updateTableView updates the data of tableView
Source and the interface UI.
2. the method according to claim 1 for realizing that Infinite Cyclic rolls selection based on UITableView in iOS system,
It is characterized in that two NSMutableArray described in step 2 are substituted with NSArray.
3. the method according to claim 1 for realizing that Infinite Cyclic rolls selection based on UITableView in iOS system,
It is characterized in that five integer variables of overall importance described in step 3 are at least one had in the variable of global modification reading characteristic
Kind.
4. the method according to claim 1 for realizing that Infinite Cyclic rolls selection based on UITableView in iOS system,
It still is able to it is characterized in that the Infinite Cyclic rolls after selection refers to the last one data object being rolled in initial data
Continue to roll, it is subsequent to continue to roll from first data object according to specified sequence.
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| CN108614739A (en) * | 2016-12-12 | 2018-10-02 | 阿里巴巴集团控股有限公司 | A kind of method and device for transmitting message |
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