拦截/劫持MKMapView的iPhone Touch事件

Question

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

1. 放大手势始终被解释为缩小
2. 没有一个缩放手势实时更新Map的视图.

在hitTest中,如果我返回"map"视图,MKMapView功能效果很好,但我没有机会拦截事件.

有任何想法吗？

MyMapView.h:

@interface MyMapView : MKMapView
{
    UIView      *map;
}

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];
}

Answer 1

我发现实现这一目标的最好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.

我不需要检测地图平移或缩放 - 我只关心用户是否已将手指放在MKMapView中的任何位置.如果需要以100%的调用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,因此我们可以将其添加到委托中,以及许多其他功能.

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

如何检测MKMapView中的任何点击(没有技巧)

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

Answer 2

我有同样的问题 - 我想在地图视图上绘制地图比例.为了做到这一点,我不得不拦截触摸事件,然后将它们发送回地图视图.不幸的是,当MKMapView不是事件的原始接收器时,一些平滑的平移和缩放动画不再起作用.

但是我已经找到了解决这个问题的方法 - 有点hacky但是有效:1.我已将MapScales UIView置于MKMapView之上,并关闭接收事件,以便底层MKMapView默认接收事件.2.我已经使用MyMainWindow类对UIWindow进行了子类化,并且我已经覆盖了该方法:

- (void) sendEvent:(UIEvent*)event {
  [super sendEvent:event];
  [self send_the_event_also_to_my_MapScales_component_with_use_of_listener_design_pattern];
}

3. 我已经使我的应用程序的主窗口成为MyMainWindow的一个不稳定状态.

通过这种方式,我的MapScales组件接收并可以对所有触摸事件做出反应,同时它不会破坏底层的MKMapView :)

Answer 3

MKMapView 不响应上面列出的触摸方法...