UIActivityIndicatorView 不旋转，直到我返回到父 UITableView
我有一个使用 UITableViews 并从服务器获取数据的应用程序。我试图将 UIActivityIndicatorView 放在父 UITableView 上，以便在加载子 UITableView 时它会旋转。我通过 Interface Builder 等将 UIActivityIndicatorView 全部连接起来。
-(void)spinTheSpinner {
NSLog(@"Spin The Spinner");
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[spinner startAnimating];
[NSThread sleepForTimeInterval:9];
[self performSelectorOnMainThread:@selector(doneSpinning) withObject:nil waitUntilDone:NO];
[pool release];
}
-(void)doneSpinning {
NSLog(@"done spinning");
[spinner stopAnimating];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[NSThread detachNewThreadSelector:@selector(spinTheSpinner) toTarget:self withObject:nil];
NSMutableString *tempText = [[NSMutableString alloc] initWithString:[categoryNumber objectAtIndex:indexPath.row]];
Threads *viewController = [[Threads alloc] initWithNibName:@"newTable" bundle:nil tagval:tempText SessionID:PHPSESSID];
[self.navigationController pushViewController:viewController animated:YES];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[viewController release];
}
因此，当我将子 UITableView 推到屏幕上时，UIActivityIndicatorView （旋转器）就位于父 UITableView 上。如果我转到子 UITableView，然后快速返回到父视图，我可以捕获正在旋转的 UIActivitIndicatorView。 NSLogs 在正确的时间显示 - 当我第一次点击父 UITableView 中的单元格时，“旋转微调器”出现在日志中。 9 秒后，我在日志中“完成旋转”，但旋转器永远不会旋转，除非我及时弹回父 UITableView。
为什么这不能正常工作的想法？
I have an App using UITableViews and fetching data from a server. I am attempting to put a UIActivityIndicatorView on the Parent UITableView, so it spins while the Child UITableView is loading. I have the UIActivityIndicatorView all hookedup through Interface Builder, etc.
-(void)spinTheSpinner {
NSLog(@"Spin The Spinner");
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[spinner startAnimating];
[NSThread sleepForTimeInterval:9];
[self performSelectorOnMainThread:@selector(doneSpinning) withObject:nil waitUntilDone:NO];
[pool release];
}
-(void)doneSpinning {
NSLog(@"done spinning");
[spinner stopAnimating];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[NSThread detachNewThreadSelector:@selector(spinTheSpinner) toTarget:self withObject:nil];
NSMutableString *tempText = [[NSMutableString alloc] initWithString:[categoryNumber objectAtIndex:indexPath.row]];
Threads *viewController = [[Threads alloc] initWithNibName:@"newTable" bundle:nil tagval:tempText SessionID:PHPSESSID];
[self.navigationController pushViewController:viewController animated:YES];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[viewController release];
}
So, when I push the Child UITableView onto the screen, the UIActivityIndicatorView (spinner) just sits there on the Parent UITableView. If I go to the Child UITableView and then quickly go back to the Parent View, I can catch the UIActivitIndicatorView in the act of spinning. The NSLogs are showing at the correct times - when I first tap the cell in the Parent UITableView, the "Spin The Spinner" appears in the Log. 9 seconds later, I get "done spinning" in the Log, but the spinner never spins unless I pop back to the Parent UITableView in time.
Ideas of why this is not working properly?
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评论（2）
也许 sleepForTimeInterval 正在阻止动画。
尝试删除 sleepForTimeInterval 并用对performSelector:withObject:afterDelay:的调用替换performSelectorOnMainThread。
Perhaps the sleepForTimeInterval is blocking the animation.
Try removing the sleepForTimeInterval and replace performSelectorOnMainThread with a call to
performSelector:withObject:afterDelay:.让 ui 在线程外显示它：
let the ui display it outside thread: