以编程方式删除子视图(Removing subviews programmatically)

以编程方式删除子视图(Removing subviews programmatically)

我在appdelegate中的didReceiveRemoteNotification：方法中得到了这段代码

我想知道如何使用延迟删除此子视图，假设子视图显示来自推送通知的信息，但我希望它们在3.5秒后消失（delay2）

谢谢！

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo { NSLog(@"remote notification: %@",[userInfo description]); NSDictionary *apsInfo = [userInfo objectForKey:@"aps"]; NSString *alert = [apsInfo objectForKey:@"alert"]; NSLog(@"Received Push Alert: %@", alert); NSString *sound = [apsInfo objectForKey:@"sound"]; NSLog(@"Received Push Sound: %@", sound); AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); NSString *badge = [apsInfo objectForKey:@"badge"]; NSLog(@"Received Push Badge: %@", badge); application.applicationIconBadgeNumber = [[apsInfo objectForKey:@"badge"] integerValue]; // Create the UILabel instance CGRect myFrame = CGRectMake(0, 20, 320, 50); UIView *myView = [[UIView alloc] initWithFrame:myFrame]; myView.backgroundColor = [UIColor blueColor]; [self.window addSubview:myView]; [myView release]; UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 35, 300, 20)]; [aLabel setText:alert]; [self.window addSubview:aLabel]; [aLabel release]; NSString *path = [[NSBundle mainBundle] pathForResource:@"sound"ofType:@"mp3"]; AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; [theAudio play]; //SONAR// [self performSelector:@selector(delay2) withObject:nil afterDelay:3.5]; } -(void)delay2 { NSString *path = [[NSBundle mainBundle] pathForResource:@"sound"ofType:@"mp3"]; AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; [theAudio play]; }

I got this code inside my didReceiveRemoteNotification: method in appdelegate

I would like to know how can I remove this subviews using a delay, it is supposed the subviews show info from a push notification but I want them to disappear after 3.5 seconds(delay2)

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo { NSLog(@"remote notification: %@",[userInfo description]); NSDictionary *apsInfo = [userInfo objectForKey:@"aps"]; NSString *alert = [apsInfo objectForKey:@"alert"]; NSLog(@"Received Push Alert: %@", alert); NSString *sound = [apsInfo objectForKey:@"sound"]; NSLog(@"Received Push Sound: %@", sound); AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); NSString *badge = [apsInfo objectForKey:@"badge"]; NSLog(@"Received Push Badge: %@", badge); application.applicationIconBadgeNumber = [[apsInfo objectForKey:@"badge"] integerValue]; // Create the UILabel instance CGRect myFrame = CGRectMake(0, 20, 320, 50); UIView *myView = [[UIView alloc] initWithFrame:myFrame]; myView.backgroundColor = [UIColor blueColor]; [self.window addSubview:myView]; [myView release]; UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 35, 300, 20)]; [aLabel setText:alert]; [self.window addSubview:aLabel]; [aLabel release]; NSString *path = [[NSBundle mainBundle] pathForResource:@"sound"ofType:@"mp3"]; AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; [theAudio play]; //SONAR// [self performSelector:@selector(delay2) withObject:nil afterDelay:3.5]; } -(void)delay2 { NSString *path = [[NSBundle mainBundle] pathForResource:@"sound"ofType:@"mp3"]; AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; [theAudio play]; }

最满意答案

您可以使用UIView的removeFromSuperview实例方法。 在向所有人添加窗口集标记的视图时。 在delay2方法中，使用tag＆removeFromSuperview方法删除它们。

CGRect myFrame = CGRectMake(0, 20, 320, 50); UIView *myView = [[UIView alloc] initWithFrame:myFrame]; myView.backgroundColor = [UIColor blueColor]; [myView setTag:999]; [self.window addSubview:myView]; [myView release]; UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 35, 300, 20)]; [aLabel setText:alert]; [aLabel setTag:999]; [self.window addSubview:aLabel]; [aLabel release]; -(void)delay2 { for(UIView *subView in window.subviews) { if(subView.tag == 999) [subView removeFromSuperview]; }

}

You can use removeFromSuperview instance method of UIView. While adding views on window set tag to all. And in delay2 method remove them using tag & removeFromSuperview method.

CGRect myFrame = CGRectMake(0, 20, 320, 50); UIView *myView = [[UIView alloc] initWithFrame:myFrame]; myView.backgroundColor = [UIColor blueColor]; [myView setTag:999]; [self.window addSubview:myView]; [myView release]; UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 35, 300, 20)]; [aLabel setText:alert]; [aLabel setTag:999]; [self.window addSubview:aLabel]; [aLabel release]; -(void)delay2 { for(UIView *subView in window.subviews) { if(subView.tag == 999) [subView removeFromSuperview]; }

}