UILongPressGestureRecognizer只調用第二次

Question

這是我的問題，當我使用UILongPressGestureRecognizer，它只在第二次工作...我按了3秒的按鈕，它不工作，但第二次，我推3秒按鈕它工作正常...有些想法？

-(IBAction)seleccionar1:(id)sender{ 
UILongPressGestureRecognizer *longpressGesture =[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)]; 
longpressGesture.minimumPressDuration = 3; 
[longpressGesture setDelegate:self]; 
[sender addGestureRecognizer:longpressGesture];} 

-(IBAction)seleccionar2:(id)sender{ 
UILongPressGestureRecognizer *longpressGesture =[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)]; 
longpressGesture.minimumPressDuration = 3; 
[longpressGesture setDelegate:self]; 
[sender addGestureRecognizer:longpressGesture];} 

- (void)longPressHandler:(UILongPressGestureRecognizer *)gestureRecognizer{ 
if(gestureRecognizer.view==boton1) 
{ 
    [boton1 setTitle:@"Funciona 1" forState:UIControlStateNormal]; 
} 
if(gestureRecognizer.view==boton2) 
{ 
    [boton2 setTitle:@"Funciona 2" forState:UIControlStateNormal]; 
}} 

感謝所有的朋友。

問候

Answer 1

，因爲在第一次的動作不是添加到按鈕添加它的用戶動作..手勢之前例如在viewDidLoad中添加這樣的按鈕。