Question

我使用长按手势创建一个简单的视图（黑色方块）并将其拖动到屏幕上（UIGestureRecognizerStateChanged），直到我捕获到UIGestureRecognizerStateEnded。好的，这很好用。现在我希望能够开始识别这个黑色方形视图的附加手势（UISwipeGestureRecognizer）。算法很简单：

长按
手指停留在屏幕上
拖动方形视图（setCenter：）
滑动并识别UISwipeGestureRecognizer

问题是当长按手势未完成时我无法识别滑动（UIGestureRecognizerStateEnded）

#pragma mark - View lifecycle

- (void)loadView {
    [super loadView];

    // Long press
    self.longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(gestureAction:)];
    [self.longPressGestureRecognizer setDelegate:self];
    [self.view addGestureRecognizer:self.longPressGestureRecognizer];

    // Swipe
    self.swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(gestureAction:)];
    [self.swipeGestureRecognizer setDelegate:self];
    [self.swipeGestureRecognizer setEnabled:NO];
    [self.view addGestureRecognizer:self.swipeGestureRecognizer];
}

#pragma mark - Gesture recognizer

- (void)gestureAction:(UIGestureRecognizer *)recognizer {

    // Swipe
    if ([recognizer isKindOfClass:NSClassFromString(@"UISwipeGestureRecognizer")]) {
        NSLog(@"swipeGestureRecognizer handled!!");
    }

    // Long press
    if ([recognizer isKindOfClass:NSClassFromString(@"UILongPressGestureRecognizer")]) {
        if (recognizer.state == UIGestureRecognizerStateBegan) {
            self.activeView = [[ItemView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
            [self.activeView setBackgroundColor:[UIColor blackColor]];
            self.activeView.center = [recognizer locationInView:self.view];
            [self.view addSubview:self.activeView];
        }
        else if (recognizer.state == UIGestureRecognizerStateChanged) {
            if (![self.swipeGestureRecognizer isEnabled]) {
                [self.swipeGestureRecognizer setEnabled:YES];
                NSLog(@"swipeGestureRecognizer enabled");
            }
            self.activeView.center = [recognizer locationInView:self.view];
        }
        else if (recognizer.state == UIGestureRecognizerStateEnded) {
            [self.swipeGestureRecognizer setEnabled:NO];
            NSLog(@"swipeGestureRecognizer disabled");
            [self.activeView removeFromSuperview];
            self.activeView = nil;
        }
    }
}

#pragma mark - UIGestureRecognizerDelegate

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

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    return YES;
}

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

P.S。当您在日期画布上长按时创建事件时，我希望行为与本机日历应用程序中的行为完全相同。如果你滑动一个物体（在你长按手势之前）它会平滑地消失。

Answer 1

要同时识别多个手势，您需要使用UiGestureRecognizer协议中的以下委托方法，

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

以下是文档的LINK。

修改

所以我尝试做同样的事情，是的，即使在我的情况下，直到长按结束才能识别滑动..！所以你想要移动视图，然后使用PanGesture而不是滑动手势..！它会工作我刚试过.. :)）

Answer 2

您启用滑动识别器时关闭：否。我建议坚持下去。并且例如计算一个手势被识别的时间。如果收到相同的手势，则不要添加此计数器。当它以正确的顺序发生时，你设置一个功能来打开/释放一个动作。

同时使用UILongPressGestureRecognizer和UISwipeGestureRecognizer

2 个答案: