Question

我在另一个UIView之上有一个UIView，我希望顶级的只能在1,2和3个水龙头上响应UITapGestureRecognizer，但是任何其他事件都会传递给它下面的UIView。下面的视图有一个UIPinchGestureRecognizer和一个UIPanGestureRecognizer，但如果任何触摸位于顶部UIView上，则无效。如果我将顶部UIView设置为userInteractionEnabled为NO，那么它是正常的，但是我当然无法从顶部UIView获得点击。任何提示都非常感谢。

Answer 1

我调整了Touches样本。不确定这是否是正确的方法。

所有这一切都在具有两个视图的视图控制器中完成（topView和bottomView）。

在viewDidLoad中的

我将所有手势识别器添加到顶视图 -

    tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureCaught)];
    [tapGesture setDelegate:self];
    [topView addGestureRecognizer:tapGesture];
    [tapGesture release];

    panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panBottomView)];
    [panGestureRecognizer setMaximumNumberOfTouches:2];
    [panGestureRecognizer setDelegate:self];
    [topView addGestureRecognizer:panGestureRecognizer];
    [panGestureRecognizer release];


    pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scaleBottomView)];
    [pinchGesture setDelegate:self];
    [topView addGestureRecognizer:pinchGesture];
    [pinchGesture release];

手势动作

    - (void)panBottomView
    {
        UIView *piece = bottomView; //Hardcoded because the pan gesture to be applied only on the bottom view.

        [self adjustAnchorPointForGestureRecognizer:panGestureRecognizer];

        if ([panGestureRecognizer state] == UIGestureRecognizerStateBegan || [panGestureRecognizer state] == UIGestureRecognizerStateChanged) {
            CGPoint translation = [panGestureRecognizer translationInView:[piece superview]];

            [piece setCenter:CGPointMake([piece center].x + translation.x, [piece center].y + translation.y)];
            [panGestureRecognizer setTranslation:CGPointZero inView:[piece superview]];
        }
    }


    // scale the piece by the current scale
    // reset the gesture recognizer's rotation to 0 after applying so the next callback is a delta from the current scale
    - (void)scaleBottomView {


        [self adjustAnchorPointForGestureRecognizer:pinchGesture];

        if ([pinchGesture state] == UIGestureRecognizerStateBegan || [pinchGesture state] == UIGestureRecognizerStateChanged) {
            bottomView.transform = CGAffineTransformScale([bottomView transform], [pinchGesture scale], [pinchGesture scale]);
            [pinchGesture setScale:1];
        }
    }

    - (void) tapGestureCaught {

//Do stuff for the topView

    }

    // scale and rotation transforms are applied relative to the layer's anchor point
    // this method moves a gesture recognizer's view's anchor point between the user's fingers
    - (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
        if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {

            /*You can put if conditions based on the class of gestureRecognizer for furthur customization. For me this method was not called for any gesture on the TOPVIEW. So i have sort of harcoded the following line*/
            UIView *piece = bottomView;
            CGPoint locationInView = [gestureRecognizer locationInView:piece];
            CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview];

            piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height);
            piece.center = locationInSuperview;
        }
    }

我还没有完全测试所有代码。尝试一下，看看它是否有效。

UIView通过某些事件

1 个答案: