ios - 将事件传递到另一个 View

Question

我有一种情况，我想将一个 UIView(不是我的代码)放在另一个 UIView 的顶部，并将事件传播到最底部的 View 。更具体地说，我想在 MKMapView 之上放置一个 UIView。

我有一个包含两个 View (作为 subview )的 UIView。我希望我的 uiview 将事件从它的 View 转发到它的两个 subview 。

.h:

@interface MyUIView : UIView

@end

.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，并且我试图将拦截的事件传递给 mkMapView。我看到了日志消息，但是它似乎没有传递事件，因为我可以使 mkmapview 滚动/平移。

Answer 1

如果另一个 View 位于带有附加手势识别器的 View 的顶部，则手势识别器与最顶层 View 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 并在不需要时适本地删除它们。该操作不需要在接收手势的同一 View 上执行，因此在其他 View 中接收平移手势然后在后台平移 map 应该可以工作。