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我正試圖在iPhone應用程序中創建一個活動指示器。問題是,我不能讓它出現在實際的任務之前,我希望它已經完成顯示。關於iPhone的操作順序,有沒有什麼特別的東西?如何讓UIView即時顯示?
這裏是我的問題的代碼(在我的應用程序委託):
-(BOOL)showProgressView: (NSString *) message {
self.progress = [[UIView alloc] initWithFrame:window.frame];
UIImageView *img = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"squircle.png"]];
[img setAlpha:0.5];
[img setFrame:CGRectMake(94, 173, 133, 133)];
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(51.5, 51.5, 30, 30)];
spinner.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
[img addSubview:spinner];
[self.progress addSubview:img];
[spinner startAnimating];
[img release];
[spinner release];
[window addSubview:self.progress];
return YES;
}
然後我把這個代碼:
if ([appDelegate showProgressView:@"Loading..:"])
{
//My actual code loads data and stuff here but that is not important
//drawCtrl is a UIViewController subclass that is instantiated here
UINavigationController *navController = [appDelegate navigationController];
[navController pushViewController:drawCtrl animated:YES];
[drawCtrl release];
}
的問題是,我的活動指示燈直到新的視圖控制器被推入navController的堆棧纔會出現。我能以某種方式控制它嗎?
在此先感謝!
-Mats