UILongPressGestureRecognizer在文本字段上顯示警報

Question

我有一個UILongPressGestureRecognizer添加到UITextField。 當我按下UITextField時，它向我顯示警報，但這是三個警報向我顯示。 那是我的代碼：

- (void)viewDidLoad
{
    [super viewDidLoad];
    UILongPressGestureRecognizer *gs = [[UILongPressGestureRecognizer      alloc]initWithTarget:self action:@selector(AlertServer:)];
    gs.delegate = self;
    [_companyidTxt addGestureRecognizer:gs];
    [gs release];
}
-(void)AlertServer:(UILongPressGestureRecognizer *)gs
{
    alertView = [[UIAlertView alloc] initWithTitle:@"Server" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Okay", nil];
    alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
    myTextField = [alertView textFieldAtIndex:0];
    myTextField.text=mainString;
    [alertView show];
    [alertView release];
    [alertView retain];
}

誰能解釋這種情況的發生以及如何預防？ 提前感謝

Answer 1

嘗試這個，

-  (void)AlertServer:(UILongPressGestureRecognizer*)sender { 
    if (sender.state == UIGestureRecognizerStateEnded) {
       alertView = [[UIAlertView alloc] initWithTitle:@"Server" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Okay", nil];
    alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
    myTextField = [alertView textFieldAtIndex:0];
    myTextField.text=mainString;
    [alertView show];
    [alertView release];

     }
    else if (sender.state == UIGestureRecognizerStateBegan){
       NSLog(@"UIGestureRecognizerStateBegan.");
   //Do Whatever You want on Began of Gesture
     }
  }

Answer 2

根據觀察結果更改longPressGestureRecognizer.minimumPressDuration （時間間隔以秒為單位。默認持續時間為0.5秒。）或使用某些標志來檢查是否已顯示警報。