我正在申请

1) 我显示一个警报 View 以接受或拒绝调用....

2) 但是，如果调用者自己取消了调用，则会显示一条警报，说明调用者已取消调用。

我的问题是，如果调用在我接受之前被取消，警报 View 会堆叠起来，并且在警报 View (2)的附近我仍然可以看到警报 View (1)，因为我的要求是直接显示查看任何警报 View 的关闭。

我已经创建了一个生成警报 View 的方法，我给警报 View 提供了差异标签

-(void)generateMessage:(const char*)msg Title:(const char*)title withAcceptButton: (bool)doAddAcceptButton Tag:(int)tag{

dispatch_async(dispatch_get_main_queue(), ^{

                 // We are now back on the main thread
                 UIAlertView *alertView = [[UIAlertView alloc] >init];
                //add button

                 if(doAddAcceptButton==true)
                 {
                     [alertView  addButtonWithTitle:@"OK"];
                     [alertView addButtonWithTitle:@"Cancel"];
                     alertView.cancelButtonIndex=1;

                 }
                 else {
                     [alertView  addButtonWithTitle:@"OK"];
                     alertView.cancelButtonIndex=0;
                 }

                 //add tag
                 [alertView setTag:tag];

                 //add title
                 if(title==NULL)
                 {
                     [alertView setTitle:@"MESSAGE"];
                 }
                 else {
                     NSMutableString *head = [[NSMutableString >alloc] initWithCString:title
                                                                             >encoding:NSUTF8StringEncoding];
                     [alertView setTitle:head];
                     [head release];
                 }


                 if(msg==NULL)
                 {
                     [alertView setMessage:@"ERROR"];
                 }
                 else {
                     NSMutableString *body = [[NSMutableString >alloc] initWithCString:msg
                                                                             >encoding:NSUTF8StringEncoding];
                     [alertView setMessage:body];
                     [body release];
                 }
                 [alertView setDelegate:self];
                 [alertView show];
                 [alertView release];


             });

}

最佳答案

只需保留对警报 View 的引用。这样，如果第一个仍在显示，您可以在显示第二个之前清除它。像这样的东西:

.h文件:

@interface ViewController : UIViewController <UIAlertViewDelegate> {
  UIAlertView * _alertView1;
  UIAlertView * _alertView2;
}

.m文件:

- (void)viewDidLoad; {
  [super viewDidLoad];
  _alertView1 = [[UIAlertView alloc] initWithTitle:@"Alert 1" message:@"A New call!" delegate:self cancelButtonTitle:@"Deny" otherButtonTitles:@"Accept", nil];
  _alertView2 = [[UIAlertView alloc] initWithTitle:@"Alert 2" message:@"The Call was cancelled!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
}

- (void)callWasCancelled; { // This would be the method where the second AlertView is called.
  if(_alertView1.isVisible){
    [_alertView1 dismissWithClickedButtonIndex:0 animated:YES];
  }
  [_alertView2 show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex; {
  if(alertView == _alertView1){
    if(buttonIndex == 1){
      // Accept the call!
    }
  }
}

希望对您有所帮助!

关于iphone - 处理两个警报 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10679782/