檢測UITableView單元格中的Tap＆Hold

Question

我們如何檢測&保持在UITableViewCell？

Answer 1

在iOS 3.2或更高版本可以使用UILongPressGestureRecognizer

Answer 2

你或許應該處理UIControlTouchDown事件，這取決於你的意思是「持有」的東西，火的NSTimer，因爲你發起的觸摸，將計算的時間間隔，並在燒製時失效或釋放觸摸（UIControlTouchUpInside和UIControlTouchUpOutside events）。當定時器啓動時，您會檢測到「輕按&」。

Answer 3

下面是直接從我的應用程序解除的代碼。您應該將這些方法（和一個布爾_cancelTouches成員）添加到您從UITableViewCell派生的類中。

-(void) tapNHoldFired { 
    self->_cancelTouches = YES; 
    // DO WHATEVER YOU LIKE HERE!!! 
} 
-(void) cancelTapNHold { 
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tapNHoldFired) object:nil]; 
} 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
    self->_cancelTouches = NO; 
    [super touchesBegan:touches withEvent:event]; 
    [self performSelector:@selector(tapNHoldFired) withObject:nil afterDelay:.7]; 
} 
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
    [self cancelTapNHold]; 
    if (self->_cancelTouches) 
     return; 
    [super touchesEnded:touches withEvent:event]; 
} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 
    [self cancelTapNHold]; 
    [super touchesMoved:touches withEvent:event]; 
} 

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { 
    [self cancelTapNHold]; 
    [super touchesCancelled:touches withEvent:event]; 
} 

Answer 4

//Add gesture to a method where the view is being created. In this example long tap is added to tile (a subclass of UIView): 

    // Add long tap for the main tiles 
    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longTap:)]; 
    [tile addGestureRecognizer:longPressGesture]; 
    [longPressGesture release]; 

-(void) longTap:(UILongPressGestureRecognizer *)gestureRecognizer{ 
    NSLog(@"gestureRecognizer= %@",gestureRecognizer); 
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) { 
     NSLog(@"longTap began"); 

    } 

}