CN108694066A - A kind of method that tableView delays refresh - Google Patents
A kind of method that tableView delays refresh Download PDFInfo
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- CN108694066A CN108694066A CN201810439848.2A CN201810439848A CN108694066A CN 108694066 A CN108694066 A CN 108694066A CN 201810439848 A CN201810439848 A CN 201810439848A CN 108694066 A CN108694066 A CN 108694066A
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- Prior art keywords
- tableview
- refresh
- version number
- delay
- kreloadver
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/451—Execution arrangements for user interfaces
Abstract
The present invention relates to the methods that a kind of tableView delays refresh, and include the following steps:Initialize an overall situation version number kReloadVer;Whether judge, which currently allows to carry out delay, is refreshed LazyLoading;If it is not allowed, the operation for refreshing entire tableView is then executed, if it is allowed, then executing following operation:The value of global version number kReloadVer adds one, generate temporary version ver, value is the same as current global version number, call dispatch_after methods, refresh tasks are made to be added to queue and delay execution, by the way of caching temporary variable in iOS closures, temporary version number and global version number are compared, the refresh requests of repetition are abandoned.The present invention can cache the principle of temporary variable using in iOS closures, and repetitive requests are abandoned by comparing the temporary version number of caching and global version number, to achieve the purpose that delay executes, save system resource, delay refreshing effect is good, is convenient for later maintenance.
Description
Technical field
The present invention relates to tableView optimisation techniques field, specifically a kind of method that tableView delays refresh.
Background technology
In the project development of iOS system, the most used class should count tableView, tableView in the iOS pages
Namely UITableView classes, referred to as table view(List control), a behavior content element Cell of tableView, and many
Cell can divide Do to have a header Header and footer Footer again with component part Section, each Section or more, many
Section then constitute whole table Table, certain Table and also have Header and Footer.App's on the market is big now
Most interfaces are all paved by tableView.
TableView is the high-level view in iOS, is inherited in ScrollView, therefore its institute with ScrollView
It is functional.The representation formats of tableView are divided to two kinds of Plain and Grouped two kinds of styles.TableView provides two kinds of agencies
Class delegate and dataSource.
The Local hydrodynamic unit logic of tableView depends on three letters typically to realizing certain some or one group of effect
Number, reload, delete, insert.Many animation effects dazzled very much of tableView are realized with this.
The refreshing of tableView common are following several:
The first refreshes:Refresh entire UITableView, self.tableView reloadData;
Second of refreshing:Refresh the cell of part;
Such as:Refresh first cell of first section
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:
indexPath,nil] withRowAnimation:UITableViewRowAnimationFade];
The third refreshes:Local hydrodynamic unit section;
Such as:Refresh the 0th section
NSIndexSet *indexSet = [[NSIndexSet alloc] initWithIndex:0];
[self.tableView reloadSections:indexSet withRowAnimation:
UITableViewRowAnimationFade];。
Under certain data interaction scenes, it may appear that the case where frequently user interface is refreshed, and frequently refreshing can make
User's interface card is obtained, reduced performance influences user experience, needs to control the opportunity of refreshing.
Invention content
In view of the deficiencies in the prior art, refresh the purpose of the present invention is to provide a kind of tableView delays
Method can cache the principle of temporary variable using in iOS closures, the temporary version number by that will cache and global version number
It compares to abandon repetitive requests, to achieve the purpose that delay executes, saves system resource, delay refreshing effect is good, is convenient for the later stage
It safeguards.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of method that tableView delays refresh, which is characterized in that include the following steps:
Initialize an overall situation version number kReloadVer;
Whether judge, which currently allows to carry out delay, is refreshed LazyLoading;
If it is not allowed, the operation for refreshing entire tableView is then executed,
If it is allowed, then executing following operation:
The value of global version number kReloadVer adds one,
Temporary version ver, the same current overall situation version number kReloadVer of value are generated,
Dispatch_after methods are called, refresh tasks is made to be added to queue and delay execution,
By the way of caching temporary variable in iOS closures, temporary version ver is cached,
When dispatch_after closures are called, temporary version ver and overall situation version number kReloadVer are compared,
If unequal, illustrate there are new dispatch_after methods called, abandon the refresh requests of repetition, realize that delay is held
The purpose that row refreshes.
Based on the above technical solution, the refresh requests for abandoning repetition realize that delay executes the purpose refreshed,
It specifically includes:
Judge whether temporary version ver and overall situation version number kReloadVer are identical,
If it is different, then after showing this delay, and have invoked delay operation, then call discard methods to abandon this operation,
If identical, further judge currently whether refreshing, current non-Flushing status then calls p_
ReloadTableView methods execute tableView and refresh.
Based on the above technical solution, when executing the operation for refreshing entire tableView, reloaddata is in data
It is called immediately after source DataSource changes.
Based on the above technical solution, the global version number kReloadVer initial values are defaulted as 0.
Based on the above technical solution, the temporary version ver is written in iOS closures and is cached.
The method that tableView delays of the present invention refresh can cache temporary variable using in iOS closures
Principle, by the way that the temporary version number of caching and global version number's comparison are abandoned repetitive requests, to reach the mesh that delay executes
, system resource is saved, delay refreshing effect is good, is convenient for later maintenance.
Description of the drawings
The present invention has following attached drawing:
The flow chart of Fig. 1 present invention.
Specific implementation mode
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, the method that tableView delays of the present invention refresh, includes the following steps:
Initialize an overall situation version number kReloadVer;
Whether judge, which currently allows to carry out delay, is refreshed LazyLoading;
If it is not allowed, the operation for refreshing entire tableView is then executed,
If it is allowed, then executing following operation:
The value of global version number kReloadVer adds one,
Temporary version ver, the same current overall situation version number kReloadVer of value are generated,
Dispatch_after methods are called, refresh tasks is made to be added to queue and delay execution,
By the way of caching temporary variable in iOS closures, temporary version ver is cached,
When dispatch_after closures are called, temporary version ver and overall situation version number kReloadVer are compared,
If unequal, illustrate there are new dispatch_after methods called, abandon the refresh requests of repetition, realize that delay is held
The purpose that row refreshes.
IOS closures are exactly the Block of iOS, can also make function variable, block that can be buffered in the outside of closure timing
Variable numerical value, when closure when calling by the way that the variable value of caching and current variable value are compared, come
Realize the judgement of certain conditions.The present invention in this way realizes the refreshing of delay tableView, and effective solution is short
Due to there is the problem of multiple network request returns cause tableView frequently to refresh in time, by caching a version ver number
Value, when closure is called, compare current value and cache size proves that new request returns if different, then can be with
Ignore this refreshing.
Based on the above technical solution, the refresh requests for abandoning repetition realize that delay executes the purpose refreshed,
It specifically includes:
Judge whether temporary version ver and overall situation version number kReloadVer are identical,
If it is different, then after showing this delay, and have invoked delay operation, then call discard methods to abandon this operation,
If identical, further judge currently whether refreshing, current non-Flushing status then calls p_
ReloadTableView methods execute tableView and refresh.
Based on the above technical solution, when executing the operation for refreshing entire tableView, reloaddata is in data
It is called immediately after source DataSource changes.
Based on the above technical solution, the global version number kReloadVer initial values are defaulted as 0.
Based on the above technical solution, the temporary version ver is written in iOS closures and is cached.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (5)
1. a kind of method that tableView delays refresh, which is characterized in that include the following steps:
Initialize an overall situation version number kReloadVer;
Whether judge, which currently allows to carry out delay, is refreshed LazyLoading;
If it is not allowed, the operation for refreshing entire tableView is then executed,
If it is allowed, then executing following operation:
The value of global version number kReloadVer adds one,
Temporary version ver, the same current overall situation version number kReloadVer of value are generated,
Dispatch_after methods are called, refresh tasks is made to be added to queue and delay execution,
By the way of caching temporary variable in iOS closures, temporary version ver is cached,
When dispatch_after closures are called, temporary version ver and overall situation version number kReloadVer are compared,
If unequal, illustrate there are new dispatch_after methods called, abandon the refresh requests of repetition, realize that delay is held
The purpose that row refreshes.
2. the method that tableView delays as described in claim 1 refresh, it is characterised in that:The refreshing for abandoning repetition
Request is realized that delay executes the purpose refreshed, is specifically included:
Judge whether temporary version ver and overall situation version number kReloadVer are identical,
If it is different, then after showing this delay, and have invoked delay operation, then call discard methods to abandon this operation,
If identical, further judge currently whether refreshing, current non-Flushing status then calls p_
ReloadTableView methods execute tableView and refresh.
3. the method that tableView delays as described in claim 1 refresh, it is characterised in that:It executes and refreshes entirely
When the operation of tableView, reloaddata is called immediately after data source DataSource changes.
4. the method that tableView delays as described in claim 1 refresh, it is characterised in that:The overall situation version number
KReloadVer initial values are defaulted as 0.
5. the method that tableView delays as described in claim 1 refresh, it is characterised in that:The temporary version ver,
It is cached in write-in iOS closures.
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| CN201810439848.2A CN108694066B (en) | 2018-05-09 | 2018-05-09 | TableView delayed refreshing method |
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| CN108694066B CN108694066B (en) | 2021-04-27 |
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| CN108694066B (en) | 2021-04-27 |
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