UIGestureRecognizer 滑动并按住

Question

我正在尝试实现滚动菜单的效果。如果用户进行单次滑动（向任何方向），我将为每次滑动移动一个项目。使用 UISwipeGestureReconizer 效果很好，但是如果用户在滑动后继续按住屏幕上的手指，我想继续滚动直到手指抬起。

看来我想将 UISwipeGestureRecognizer 与 UILongPressGestureRecognizer 结合起来来完成此任务。成功滑动 (UISwipeGestureRecognizer) 后，启用 UILongPressGestureRecognizer 并开始滚动，直到手指抬起（UILongPressGestureRecognizer 结束）。

问题是成功滑动后不会发生 UILongPressGestureRecognizer 事件。

下面是一个示例：

// Create single swipe recognizer to recognize right swipes
swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleSwipeFrom:)];
swipeRecognizer.delegate = self;
[_gestureView addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];

// Create long press recognizer to recognize right press and holds
longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeAndHoldFrom:)];
longPressRecognizer.delegate = self;
[longPressRecognizer setMinimumPressDuration:0.5];
[longPressRecognizer setEnabled:NO];
[_gestureView addGestureRecognizer:longPressRecognizer];
[longPressRecognizer release];

- (void)handleSingleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {

    if ([recognizer state] == UIGestureRecognizerStateEnded) {
        // Move one item in direction based on recognizer.direction
        [_longPressGestureRecognizer setEnabled:YES];
    }
}

如果我在滑动后将手指放在屏幕上，则永远不会调用 UILongPressGestureRecognizer 事件。关于如何实现这一目标有什么想法吗？

Answer 1

尝试实现 UIGestureRecognizerDelegate 并使用此方法：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

这将允许两者同时运行。您需要将代码添加到手柄滑动并保持方法中，以确保它仅在滑动完成后运行。

干杯