UILongPressGestureRecognizer問題

Question

我有一個關於UILongPressGestureRecognizer一個問題，我有加的姿態像下面的代碼

**ViewDidLoad** 
UILongPressGestureRecognizer *_longRecognizer = [[UILongPressGestureRecognizer alloc]  initWithTarget:self action:@selector(ICN_TRASH_Click:)]; 
NSArray *recognizerArray = [[NSArray alloc] initWithObjects:_longRecognizer, nil]; 

[[self.view viewWithTag:2001] setGestureRecognizers:recognizerArray]; 

OnClick 
if ([sender isKindOfClass:[UILongPressGestureRecognizer class]]) 
{ 

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"Are you sure delete all message ?" delegate:self cancelButtonTitle:@"Yes" otherButtonTitles:@"No",nil]; 
    [alert show]; 
    [alert release]; 

} 

所以我們長按按鈕兩次打電話alertview， 沒有任何人有一個想法，爲什麼面對這個問題。

Answer 1

所以你按下按鈕（然後釋放它，我猜），你得到的消息兩次？

也許你應該檢查手勢識別器的狀態（如果它是開始階段或結束階段）GestureRecognizer state。