Question

我在UITextField中添加了UILongPressGestureRecognizer。当我按下UITextField时，它会显示警报，但这是三个警报显示我。那是我的代码：

- (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];
}

任何人都可以解释为什么会发生这种情况，以及如何预防？ Thanx提前

Answer 1

试试这个，

-  (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

根据您的观察结果更改longPressGestureRecognizer.minimumPressDuration（时间间隔以秒为单位。默认持续时间为0.5秒。）或使用一些标记来检查是否已显示警报。

UILongPressGestureRecognizer在Textfield上显示警报

2 个答案: