lblOverlayView_text.text do not change from @"english subtitle" to @"change";
how to change, and why not ?
- (void)video123 {
lblOverlayView = [[UILabel alloc] init];
int height=40;
lblOverlayView.frame = CGRectMake(0, 480-height, 320, height);
lblOverlayView.backgroundColor = [UIColor grayColor];
lblOverlayView.alpha = 0.5f;
lblOverlayView.text = @"english subtitle";
lblOverlayView.textColor=[UIColor greenColor];
lblOverlayView.textAlignment=UITextAlignmentCenter;
NSString *urlAddress=@"http://video.ted.com/talk/stream/2011U/Blank/MattCutts_2011U-320k.mp4";
movieURL= [NSURL URLWithString:urlAddress];
//MPMoviePlayerViewController *
moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:movieURL];
[moviePlayer.view addSubview:lblOverlayView];
[self presentMoviePlayerViewControllerAnimated:moviePlayer];
[NSThread detachNewThreadSelector:@selector(thread) toTarget:self withO开发者_如何转开发bject:nil];
NSLog(@"loop test end playback starting...");
}
- (void) thread{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while (true)
{
[NSThread sleepForTimeInterval: 0.2];
lblOverlayView.text = @"change";
}
[pool drain];
}
You are updating your label from a background thread. UI elements must always be updated from the main thread.
[lblOverlayView performSelectorOnMainThread:@selector(setText:) withObject:@"Change" waitUntilDone:NO];
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