Question

我有一种情况，我想在另一个UIView之上放置一个UIView（不是我的代码），并将事件传播到最底层的视图。更具体一点的是，我想在一个MKMapView上放置一个UIView。

我有一个包含两个视图的UIView（作为子视图）。我希望我的uiview能够将事件从它的视图转发到它的子视图。

·H：

@interface MyUIView : UIView

@end

的.m：

#import "MyMapView.h"

#import <MapKit/MapKit.h>

#import "MapGestureRecognizer.h"

@implementation MyMapView

MKMapView *mkMapView;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }

    mkMapView = [[MKMapView alloc] initWithFrame:frame];
    [self addSubview:mkMapView];

// Create another view to place on top of the mkMapView
// This is not my view I do not control is codebase.  I would like to put it on top of the mkMapView
// and still have the mkMapView receive touch events
    UIView * otherView = [[UIView alloc] initWithFrame:frame];
    otherView.backgroundColor = [UIColor clearColor];
    [self addSubview:otherView];

    MapGestureRecognizer *mgr = [[MapGestureRecognizer alloc] init];
    mgr.touchesBeganCallback = ^(NSSet * touches, UIEvent * event) {
        UITouch *touch = [[event allTouches] anyObject];
        NSLog(@"touches began=%@", [NSString stringWithFormat:@"%i", touch.view.tag]);

        [mkMapView touchesBegan:touches withEvent:event];

    };

    mgr.touchesCancelledCallback = ^(NSSet * touches, UIEvent * event) {
        UITouch *touch = [[event allTouches] anyObject];
        NSLog(@"touches cancelled=%@", [NSString stringWithFormat:@"%i", touch.view.tag]);

        [mkMapView touchesCancelled:touches withEvent:event];

    };
    mgr.touchesEndedCallback = ^(NSSet * touches, UIEvent * event) {
        UITouch *touch = [[event allTouches] anyObject];
        NSLog(@"touches ended=%@", [NSString stringWithFormat:@"%i", touch.view.tag]);

        [mkMapView touchesEnded:touches withEvent:event];

    };
    mgr.touchesMovedCallback = ^(NSSet * touches, UIEvent * event) {
        UITouch *touch = [[event allTouches] anyObject];
        NSLog(@"touches moved=%@", [NSString stringWithFormat:@"%i", touch.view.tag]);

        [mkMapView touchesMoved:touches withEvent:event];

    };

    [self addGestureRecognizer:mgr];

    return self;
}


@end

我实现了自己的手势识别器来拦截这些事件，我试图将截获的事件传递给mkMapView。我看到日志消息，但它似乎没有通过事件，因为我可以使mkmapview滚动/平移。

Answer 1

如果另一个视图位于具有附加手势识别器的视图顶部，则手势识别器与最顶层视图一起工作，识别器不会触发。一种快速而肮脏的方法是将同一组识别器分配给otherView，并在不需要时适当地删除它们。不需要在接收手势的同一视图上执行操作，因此在Otherviews中接收平移手势然后在后台平移地图应该有效。

Answer 2

将您的代码更改为低于1 - >

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    mkMapView = [[MKMapView alloc] initWithFrame:frame];
    [self addSubview:mkMapView];

    UIView * otherView = [[UIView alloc] initWithFrame:frame];
    otherView.backgroundColor = [UIColor clearColor];
    [self addSubview:otherView];

    return self;
}

-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    return mkMapView;
}

将事件传递到另一个视图

2 个答案: