iOS中UIAlertView3秒后消失的两种实现方法
一,效果图。
二,代码。
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. UIAlertView* alert = [[UIAlertView alloc]initWithTitle:nil message:@"此信息3秒后消失" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil]; [alert show]; [self performSelector:@selector(dismissAlert:) withObject:alert afterDelay:3.0]; } - (void)dismissAlert:(UIAlertView*)alert { if ( alert.visible ) { [alert dismissWithClickedButtonIndex:alert.cancelButtonIndex animated:YES]; } }
下面给大家介绍下UIAlertView自动消失的两种方法
话说,在写程序的过程中用到很多提示的信息,于是非常自然地就要使用UIAlertView控件。
但是这些提示的信息有时候只需提示就行,不用操作,那么此时就要这个提示框自动消失就OK了。
UIAlertView弹出后2s让其自动消失,两种方法:
(1)结合NSTimer
UIAlertView baseAlert = nil; - (void) performDismiss: (NSTimer *)timer { [baseAlert dismissWithClickedButtonIndex:0 animated:NO];//important [baseAlert release]; baseAlert = NULL; } - (void) presentSheet { baseAlert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"\nMessage Message Message " delegate:self cancelButtonTitle:nil otherButtonTitles: nil]; [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector: @selector(performDismiss:) userInfo:nil repeats:NO]; [baseAlert show]; }
(2)使用PerformSelector:withObject:afterDelay:方法
- (void) dimissAlert:(UIAlertView *)alert { if(alert) { [alert dismissWithClickedButtonIndex:[alert cancelButtonIndex] animated:YES]; [alert release]; } } - (void)showAlert{ UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"title" message:@"message" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil]; [alert show]; [self performSelector:@selector(dimissAlert:) withObject:alert afterDelay:2.0]; }
总结
以上所述是小编给大家介绍的iOS中UIAlertView3秒后消失的两种实现方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对海外IDC网网站的支持!
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