自动关闭的Alert窗口代码,ObjC代码库,德仔网

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【ObjC】自动关闭的Alert窗口

作者:万鑫 / 发布于2014/11/15/ 586

弹出的对话框（UIAlertView）不需要用户点击按钮，可以自动关闭消失，诀窍是利用NSTimer定时器来关闭alertview。


	UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
	 message:[@"一个可以自动关闭的Alert窗口"
	 delegate:nil
	 cancelButtonTitle:nil //NSLocalizedString(@"OK", @"OK") //取消任何按钮
	 otherButtonTitles:nil];
	 //[alert setBounds:CGRectMake(alert.bounds.origin.x, alert.bounds.origin.y, alert.bounds.size.width, alert.bounds.size.height+30.0)];
	 [alert show];
	
	 UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
	
	 // Adjust the indicator so it is up a few pixels from the bottom of the alert
	 indicator.center = CGPointMake(alert.bounds.size.width/2, alert.bounds.size.height-40.0);
	 [indicator startAnimating];
	 [alert insertSubview:indicator atIndex:0];
	 [indicator release];
	
	 [NSTimer scheduledTimerWithTimeInterval:3.0f
	 target:self
	 selector:@selector(dismissAlert:)
	 userInfo:[NSDictionary dictionaryWithObjectsAndKeys:alert, @"alert", @"testing ", @"key" ,nil] //如果不用传递参数，那么可以将此项设置为nil.
	 repeats:NO];
	
	 NSLog(@"release alert");
	 [alert release];
	
	
	-(void) dismissAlert:(NSTimer *)timer{
	
	 NSLog(@"release timer");
	 NSLog([[timer userInfo] objectForKey:@"key"]);
	
	 UIAlertView *alert = [[timer userInfo] objectForKey:@"alert"];
	 [alert dismissWithClickedButtonIndex:0 animated:YES];
	
	}
	
	
	 //定时器停止使用：
	
	 [timer invalidate];
	 timer = nil;

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　Alert窗口　

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