拦截/劫持 MKMapView 的 iPhone 触摸事件 [英] Intercepting/Hijacking iPhone Touch Events for MKMapView

问题描述

3.0 SDK 是否存在禁用实时缩放和拦截 MKMapView 的放大手势的错误?我有一些真正简单的代码，所以我可以检测点击事件，但有两个问题:

Is there a bug in the 3.0 SDK that disables real-time zooming and intercepting the zoom-in gesture for the MKMapView? I have some real simple code so I can detect tap events, but there are two problems:

1. 放大手势总是被解释为缩小
2. 所有缩放手势都不会实时更新地图视图.

在 hitTest 中，如果我返回地图"视图，MKMapView 功能运行良好，但我没有机会拦截事件.

In hitTest, if I return the "map" view, the MKMapView functionality works great, but I don't get the opportunity to intercept the events.

有什么想法吗?

MyMapView.h:

MyMapView.h:

@interface MyMapView : MKMapView
{
    UIView      *map;
}

MyMapView.m:

MyMapView.m:

- (id)initWithFrame:(CGRect)frame
{
    if (![super initWithFrame:frame])
        return nil;

    self.multipleTouchEnabled = true;

    return self;
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    NSLog(@"Hit Test");
    map = [super hitTest:point withEvent:event];
    return self;
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"%s", __FUNCTION__);
    [map touchesCancelled:touches withEvent:event];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent*)event
{
    NSLog(@"%s", __FUNCTION__);
    [map touchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    NSLog(@"%s, %x", __FUNCTION__, mViewTouched);
    [map touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
{
    NSLog(@"%s, %x", __FUNCTION__, mViewTouched);
    [map touchesEnded:touches withEvent:event];
}

推荐答案

我发现实现这一目标的最佳方法是使用手势识别器.目前还不清楚您是想自己识别缩放事件，还是只是检测用户何时缩放/平移.

The best way I have found to achieve this is with a Gesture Recognizer. It's unclear if you want to recognize zoom events yourself or just detect when the user is zooming/panning.

我不需要检测地图平移或缩放——我只关心用户是否将手指放在 MKMapView 的任何位置.如果您需要以 100% 的召回率和精度检测缩放或平移，则可能比这更复杂.我们真正需要的是 MKMapView 的开源实现，以便我们可以将其添加到委托中，以及许多其他功能.

I don't need to detect a map pan or zoom--i just care if the user has put a finger down anywhere in the MKMapView. If you need to detect zooming or panning with 100% recall and precision, it might be more complicated than this. What we really need is an open source implementation of MKMapView so we can add this to the delegate, among many other features.

这就是我要做的:实现一个无法阻止且无法阻止其他手势识别器的手势识别器.将其添加到地图视图并根据需要处理相关的触摸事件.

Here's what I do: Implement a gesture recognizer that cannot be prevented and that cannot prevent other gesture recognizers. Add it to the map view and deal with the relevant touch events as you desire.

WildcardGestureRecognizer * tapInterceptor = [[WildcardGestureRecognizer alloc] init];
 tapInterceptor.touchesBeganCallback = ^(NSSet * touches, UIEvent * event) {
  self.lockedOnUserLocation = NO;
 };
 [mapView addGestureRecognizer:tapInterceptor];

WildcardGestureRecognizer.h

//
//  WildcardGestureRecognizer.h
//  Copyright 2010 Floatopian LLC. All rights reserved.
//

#import <Foundation/Foundation.h>

typedef void (^TouchesEventBlock)(NSSet * touches, UIEvent * event);

@interface WildcardGestureRecognizer : UIGestureRecognizer {
 TouchesEventBlock touchesBeganCallback;
}
@property(copy) TouchesEventBlock touchesBeganCallback;


@end

WildcardGestureRecognizer.m

//
//  WildcardGestureRecognizer.m
//  Created by Raymond Daly on 10/31/10.
//  Copyright 2010 Floatopian LLC. All rights reserved.
//

#import "WildcardGestureRecognizer.h"


@implementation WildcardGestureRecognizer
@synthesize touchesBeganCallback;

-(id) init{
 if (self = [super init])
 {
  self.cancelsTouchesInView = NO;
 }
 return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
 if (touchesBeganCallback)
  touchesBeganCallback(touches, event);
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
}

- (void)reset
{
}

- (void)ignoreTouch:(UITouch *)touch forEvent:(UIEvent *)event
{
}

- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer
{
 return NO;
}

- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
{
 return NO;
}

@end

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