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https://issues.apache.org/jira/browse/WEEX-648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667231#comment-16667231
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ASF GitHub Bot commented on WEEX-648:
-------------------------------------
wqyfavor commented on a change in pull request #1644: [WEEX-648][iOS]native
batch for dom operations generating from JavaScript
URL: https://github.com/apache/incubator-weex/pull/1644#discussion_r228931993
##########
File path: ios/sdk/WeexSDK/Sources/Manager/WXComponentManager.mm
##########
@@ -991,8 +991,38 @@ - (void) _printFlexComponentFrame:(WXComponent *)component
- (void)_syncUITasks
{
- NSArray<dispatch_block_t> *blocks = _uiTaskQueue;
- _uiTaskQueue = [NSMutableArray array];
+ static NSInteger _syncUITaskCount = 0;
+ NSInteger mismatchBeginIndex = _uiTaskQueue.count;
+ for (NSInteger i = _uiTaskQueue.count - 1;i >= 0;i --) {
+ if (_uiTaskQueue[i] == WXPerformUITaskBatchEndBlock) {
+ _syncUITaskCount = 0;
+ // clear when find the matches for end and begin tag
+ break;
+ }
+ if (_uiTaskQueue[i] == WXPerformUITaskBatchBeginBlock) {
+ mismatchBeginIndex = i;
+ break;
+ }
+ }
+
+ NSArray<dispatch_block_t> *blocks = nil;
+ if (mismatchBeginIndex == _uiTaskQueue.count) {
+ // here we get end tag or there are not begin and end directives
+ } else {
+ _syncUITaskCount ++;
+ // we only find begin tag but missing end tag,
+ if (_syncUITaskCount > (MAX_DROP_FRAME_FOR_BATCH)) {
+ // when the wait times come to MAX_DROP_FRAME_FOR_BATCH, we will
pop all the stashed operation for user experience.
+ mismatchBeginIndex = _uiTaskQueue.count;
+ _syncUITaskCount = 0;
+ }
+ }
+
+ if (mismatchBeginIndex > 0) {
+ blocks = [_uiTaskQueue subarrayWithRange:NSMakeRange(0,
mismatchBeginIndex)];
+ [_uiTaskQueue removeObjectsInRange:NSMakeRange(0, blocks.count)];
+ }
+
Review comment:
把下面的dispatch_async也放到if (mismatchBeginIndex >
0)这个if里面吧，空任务的时候减少一次给main提交block。
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> introduce native batch for dom operations generating from javaScript
> --------------------------------------------------------------------
>
> Key: WEEX-648
> URL: https://issues.apache.org/jira/browse/WEEX-648
> Project: Weex
> Issue Type: Improvement
> Components: Android, iOS
> Reporter: xingZhang
> Assignee: xingZhang
> Priority: Major
>
> We will introduce native batch for dom operations generating from javaScript
> wrap a series of dom operations with beginBatch and endBatch directives, when
> every V-sync signal comes, we ensure that the operations between beginBatch
> and endBatch can be performed in current V-sync, this policy can drop frames
> maybe, for our policy dropping frames, we only allow 20 frames at most.
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