iphone - 确定长按手势识别器的位置

Question

目前我在四个不同的 TableView 上有 Long Pres Gesture Recognizers(每个 Storyboard场景中有两个，因此有两个 Storyboard场景)。我在 ViewDidLoad 方法中使用以下代码创建了这些 LPGR...

//Add Long Press Gesture Reconizer
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] 
                                      initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 1; //seconds
lpgr.delegate = self;
[self.GolferOne addGestureRecognizer:lpgr];
[self.GolferTwo addGestureRecognizer:lpgr];
[self.GolferThree addGestureRecognizer:lpgr];
[self.GolferFour addGestureRecognizer:lpgr];
//Done Adding Long Press Gesture Reconizer

接下来我有另一种方法，我想在 LPG 被按下的地方进行 NSLog...

CGPoint p = [gestureRecognizer locationInView:self.GolferOne];

   NSIndexPath *indexPath = [self.GolferOne indexPathForRowAtPoint:p];
    if (indexPath == nil)
        NSLog(@"long press on table view but not on a row [Golfer One]");
    else
        NSLog(@"long press on table view at row %d [Golfer One]", indexPath.row);

    //Golfer Two

    p = [gestureRecognizer locationInView:self.GolferTwo];

    indexPath = [self.GolferTwo indexPathForRowAtPoint:p];
    if (indexPath == nil)
        NSLog(@"long press on table view but not on a row [Golfer Two]");
    else
        NSLog(@"long press on table view at row %d [Golfer Two]", indexPath.row);

    //Golfer Three

    p = [gestureRecognizer locationInView:self.GolferThree];

    indexPath = [self.GolferThree indexPathForRowAtPoint:p];
    if (indexPath == nil)
        NSLog(@"long press on table view but not on a row [Golfer Three]");
    else
        NSLog(@"long press on table view at row %d [Golfer Three]", indexPath.row);

    //Golfer Four

    p = [gestureRecognizer locationInView:self.GolferFour];

    indexPath = [self.GolferFour indexPathForRowAtPoint:p];
    if (indexPath == nil)
        NSLog(@"long press on table view but not on a row [Golfer Four]");
    else
        NSLog(@"long press on table view at row %d [Golfer Four]", indexPath.row);

我知道它为什么不起作用，但我找不到让它起作用的解决方案。它不是只返回一个 NSLog，而是返回四次(每个高尔夫球手一次，因为其中三个的 indexPath=nil)

任何帮助将不胜感激。还有为什么它对 NSLog 有这样的滞后？

Answer 1

根据识别器的 locationInView: 属性确定手势在 View 中的位置:

// Get the location of the gesture
CGPoint location = [recognizer locationInView:self.view];