CN108694066B - TableView delayed refreshing method - Google Patents
TableView delayed refreshing method Download PDFInfo
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- CN108694066B CN108694066B CN201810439848.2A CN201810439848A CN108694066B CN 108694066 B CN108694066 B CN 108694066B CN 201810439848 A CN201810439848 A CN 201810439848A CN 108694066 B CN108694066 B CN 108694066B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- 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 invention relates to a tableView delayed refresh method, which comprises the following steps: initializing a global version number kReloadVer; judging whether lazyloloading is allowed to be performed at present; if not, the operation of refreshing the whole tableView is executed, and if the operation is allowed, the following operations are executed: adding one to the value of the global version number kReloadVer to generate a temporary version number ver, taking the value of the temporary version number ver and the current global version number, calling a dispatch _ after method to enable a refreshing task to be added into a queue and to be executed in a delayed mode, comparing the temporary version number with the global version number in a mode of caching a temporary variable in an iOS closure, and discarding repeated refreshing requests. The invention utilizes the principle that temporary variables can be cached in the iOS closure, discards repeated requests by comparing the cached temporary version number with the global version number, achieves the purpose of delaying execution, saves system resources, has good delayed refreshing effect and is convenient for later maintenance.
Description
Technical Field
The invention relates to the technical field of tableView optimization, in particular to a method for delaying refresh of tableView.
Background
In the project development of the iOS system, the most frequently used class in the iOS page corresponds to tablevew, which is also called a uitabeview class and is called a Table view (list control), one row of the tablevew is a content unit Cell, and many cells can form part of sections, each Section is further divided into a Header and a Footer, many sections form the whole Table, and certainly the Table also includes the Header and the Footer. Most interfaces of apps on the market today are tiled by tableView.
TableView is a high level view in iOS that inherits from ScrollView, so it has all the functionality of ScrollView. the tableView representation format is divided into two types, namely Plain and group. tableView provides two proxy classes, delete and dataSource.
the local refresh logic of tableView, usually to achieve some or a set of effects, relies on three functions, load, delete, insert. Many of the dazzling animation effects of tableView are achieved in this way.
the refresh of tableView is common to several:
first refresh: refresh the entire UITableView, self.
And a second refresh: refreshing local cells;
for example: refreshing the first cell of the first section
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationFade];
And a third refresh: locally refreshing a section;
for example: refresh 0 th section
NSIndexSet *indexSet = [[NSIndexSet alloc] initWithIndex:0];
[self.tableView reloadSections:indexSet withRowAnimation:UITableViewRowAnimationFade];。
Under certain data interaction situations, frequent refreshing of the user interface occurs, and the frequent refreshing causes the user interface to be stuck, the performance is reduced, the user experience is affected, and the refreshing time needs to be controlled.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a tableView delayed refreshing method, which achieves the purpose of delayed execution by using the principle that a temporary variable can be cached in an iOS closure and abandoning repeated requests by comparing the cached temporary version number with the global version number, saves system resources, has good delayed refreshing effect and is convenient for later maintenance.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method for deferred refresh of tableView, comprising the steps of:
initializing a global version number kReloadVer;
judging whether lazyloloading is allowed to be performed at present;
if not, an operation of refreshing the entire tableView is performed,
if so, performing the following operations:
the value of the global version number kReloadVer is incremented by one,
generating a temporary version number ver which takes the value of the temporary version number ver as the current global version number kReloadVer,
the dispatch _ after method is invoked, the flush task is added to the queue and delayed from executing,
caching the temporary version number ver by adopting a mode of caching temporary variables in the iOS closure,
when the dispatch _ after closure is called, the temporary version number ver is compared with the global version number kReloadVer, if the temporary version number ver is not equal to the global version number kReloadVer, a new dispatch _ after method is called, repeated refresh requests are abandoned, and the purpose of delaying the execution of refresh is achieved.
On the basis of the above technical solution, the discarding of the repeated refresh request achieves the purpose of delaying the execution of refresh, and specifically includes:
judging whether the temporary version number ver and the global version number kReloadVer are the same or not,
if the difference is different, the delay operation is called after the delay, the discard method is called to abandon the operation,
if the two states are the same, further judging whether the refresh is currently carried out or not, and if the refresh is not currently carried out, calling a p _ reloadTableView method to execute tableView refresh.
On the basis of the technical scheme, when the operation of refreshing the whole tableView is executed, the reloaddata is called immediately after the data source is changed.
On the basis of the technical scheme, the initial value of the global version number kReloadVer is defaulted to 0.
On the basis of the technical scheme, the temporary version number ver is written into the iOS closure for caching.
The method for delayed refreshing of tableView provided by the invention utilizes the principle that temporary variables can be cached in the iOS closure, discards repeated requests by comparing the cached temporary version number with the global version number, achieves the purpose of delayed execution, saves system resources, has good delayed refreshing effect and is convenient for later maintenance.
Drawings
The invention has the following drawings:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the method for deferred refresh of tableView according to the present invention comprises the following steps:
initializing a global version number kReloadVer;
judging whether lazyloloading is allowed to be performed at present;
if not, an operation of refreshing the entire tableView is performed,
if so, performing the following operations:
the value of the global version number kReloadVer is incremented by one,
generating a temporary version number ver which takes the value of the temporary version number ver as the current global version number kReloadVer,
the dispatch _ after method is invoked, the flush task is added to the queue and delayed from executing,
caching the temporary version number ver by adopting a mode of caching temporary variables in the iOS closure,
when the dispatch _ after closure is called, the temporary version number ver is compared with the global version number kReloadVer, if the temporary version number ver is not equal to the global version number kReloadVer, a new dispatch _ after method is called, repeated refresh requests are abandoned, and the purpose of delaying the execution of refresh is achieved.
The iOS closure is a Block of the iOS, which may also be called a function variable, and the Block may cache values of external variables at the time of the closure, and when the closure is called, the determination of certain conditions is realized by comparing the cached variable values with the current variable values. The method realizes the refresh of the delayed tableView, effectively solves the problem of frequent refresh of the tableView caused by the return of a plurality of network requests in a short time, compares the current value with the cache value when the closure is called by caching a version ver value, and if the current value is different from the cache value, proves that a new request is returned, and can ignore the refresh.
On the basis of the above technical solution, the discarding of the repeated refresh request achieves the purpose of delaying the execution of refresh, and specifically includes:
judging whether the temporary version number ver and the global version number kReloadVer are the same or not,
if the difference is different, the delay operation is called after the delay, the discard method is called to abandon the operation,
if the two states are the same, further judging whether the refresh is currently carried out or not, and if the refresh is not currently carried out, calling a p _ reloadTableView method to execute tableView refresh.
On the basis of the technical scheme, when the operation of refreshing the whole tableView is executed, the reloaddata is called immediately after the data source is changed.
On the basis of the technical scheme, the initial value of the global version number kReloadVer is defaulted to 0.
On the basis of the technical scheme, the temporary version number ver is written into the iOS closure for caching.
Those not described in detail in this specification are within the skill of the art.
Claims (4)
1. A method for deferred refresh of tableView, comprising the steps of:
initializing a global version number kReloadVer;
judging whether lazyloloading is allowed to be performed at present;
if not, an operation of refreshing the entire tableView is performed,
if so, performing the following operations:
the value of the global version number kReloadVer is incremented by one,
generating a temporary version number ver which takes the value of the temporary version number ver as the current global version number kReloadVer,
the dispatch _ after method is invoked, the flush task is added to the queue and delayed from executing,
caching the temporary version number ver by adopting a mode of caching temporary variables in the iOS closure,
when the dispatch _ after closure is called, comparing the temporary version number ver with the global version number kReloadVer, if the temporary version number ver is not equal to the global version number kReloadVer, indicating that a new dispatch _ after method is called, discarding repeated refresh requests, and realizing the purpose of delaying the execution of refresh;
the discarding of the repeated refresh request realizes the purpose of delaying the execution of the refresh, and specifically includes:
judging whether the temporary version number ver and the global version number kReloadVer are the same or not,
if the difference is different, the delay operation is called after the delay, the discard method is called to abandon the operation,
if the two states are the same, further judging whether the refresh is currently carried out or not, and if the refresh is not currently carried out, calling a p _ reloadTableView method to execute tableView refresh.
2. The tablevew delayed refresh method of claim 1, wherein: when the operation of refreshing the whole tableView is executed, the reloaddata is called immediately after the data source DataSource is changed.
3. The tablevew delayed refresh method of claim 1, wherein: the initial value of the global version number kReloadVer is defaulted to 0.
4. The tablevew delayed refresh method of claim 1, wherein: and the temporary version number ver is written into the iOS closure for caching.
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