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我有一个tableview（文件名-5.m），它工作正常，并正确显示tableview中的数据。当用户选择一行时，它会在同一屏幕上添加一个显示进度指示器的子视图。添加子视图后，它启动一个后台线程，解析HTML数据并将其添加到SQLite3数据库。后台线程，SQLIte数据插入，HTML解析都工作正常。现在，当它完成时，它会在removeProgressInd方法中返回到five.m，该方法将删除进度指示器并导航到新的表视图（文件名TitleOnly.m）。它可以成功返回，因为我可以看到来自removeProgressInd方法的所有NSLog消息。但是代码不会停止进度指标，也不会移动到新的tableview。代码运行没有任何错误。我试图在viewDidLoad和viewDidAppear中运行相同的代码，而不是removeProgressInd，但我只看到NSLog消息。这是我的代码。从后台线程返回代码不工作
Five.m - 的tableview DidSelelectRow
{
// start ProgressInd
[self.view addSubview:self.progressInd];
// shows progress Indicator on screen when I run my app in simulator
// start Parsing Calculation in Background thread
if ([email protected]"0")
{
NSLog(@"starting backgroung thread- parsing calulation- because flag==0");
ParsingCalculation *parsC = [[ParsingCalculation alloc] init];
[queue addOperation:parsC];
[parsC performSelectorInBackground:@selector(main) withObject:nil];
[parsC release];
//successfully starts parsing in background
}
}
ParsingCalculation.m文件代码
- (void)main {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
//your code to do the operations...
appDelegate5=[[[UIApplication sharedApplication] delegate] retain];
NSLog(@"Now we are in ParsingCalulation.m");
//resultsFromURL is another method in parsingCalulation.m that does all parsing successfully
[self resultsFromURL:appDelegate5.globalLocationURL];
NSLog(@"Now we are moving back in Five.m -calling function removeProgressInd ");
[[Five shared] performSelectorOnMainThread:@selector(removeProgressInd)
withObject:nil
waitUntilDone:YES];
//it returns back to five.m successfully after finishing HTML Parsing
[pool release];
}
Five.m - removeProgressInd方法
-(void) removeProgressInd{
NSLog(@"Now we are back in Five.m -in function removeProgressInd ");
//remove progressInd from superview as parsing calculation has been completed
[progressInd stopAnimating];
[self.progressInd removeFromSuperview];
//move to TitleOnly.m tableview
NSLog(@"navigate to TitleOnly ");
TitleOnly *newView = [[TitleOnly alloc] initWithNibName:@"TitleOnly" bundle:nil];
[self.navigationController pushViewController:newView animated:YES];
[newView release];
}
我可以在控制台中看到“导航到TitleOnly”消息而没有任何错误，这意味着它成功运行了[progressInd stopAnimating]和[self.progressInd removeFromSuperview]命令，没有任何错误，因为这些命令就在此NSLog消息之前。但它不会从屏幕上删除进度指标。同样，它不显示TitleOnly tableview。 ''
我该如何解决它？哪里有问题？我究竟做错了什么？
请尽快回复。