如何拦截触摸MKMapView或UIWebView对象上的事件？

Question

如何拦截触摸MKMapView或UIWebView对象上的事件？我不确定我做错了什么，但我试图抓住一个MKMapView物体。我通过创建以下类来继承它：#import <UIKit/UIKit.h>#import <MapKit/MapKit.h>@interface MapViewWithTouches : MKMapView {}- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event;   @end并实施：#import "MapViewWithTouches.h"@implementation MapViewWithTouches- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event {     NSLog(@"hello");     //[super touchesBegan:touches   withEvent:event];}@end但看起来当我使用这个类时，我在控制台上看不到任何内容：MapViewWithTouches *mapView = [[MapViewWithTouches alloc] initWithFrame:self.view.frame];[self.view insertSubview:mapView atIndex:0];知道我做错了什么吗？

Answer 1

我发现实现这一目标的最好方法是使用手势识别器。其他方式涉及大量的hackish编程，不完美地复制Apple的代码，特别是在多点触控的情况下。

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。将它添加到地图视图，然后使用gestureRecognizer的touchesBegan，touchesMoved等等。

如何检测MKMapView中的任何水龙头（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

SWIFT 3

let tapInterceptor = WildCardGestureRecognizer(target: nil, action: nil)tapInterceptor.touchesBeganCallback = {
    _, _ in
    self.lockedOnUserLocation = false}mapView.addGestureRecognizer(tapInterceptor)

WildCardGestureRecognizer.swift

import UIKit.UIGestureRecognizerSubclassclass WildCardGestureRecognizer: UIGestureRecognizer {

    var touchesBeganCallback: ((Set<UITouch>, UIEvent) -> Void)?

    override init(target: Any?, action: Selector?) {
        super.init(target: target, action: action)
        self.cancelsTouchesInView = false
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
        touchesBeganCallback?(touches, event)
    }

    override func canPrevent(_ preventedGestureRecognizer: UIGestureRecognizer) -> Bool {
        return false
    }

    override func canBePrevented(by preventingGestureRecognizer: UIGestureRecognizer) -> Bool {
        return false
    }}

Answer 2

经过一天的比萨饼，尖叫声，我终于找到了解决方案！井井有条！

Peter，我使用了上面的技巧并稍微调整了一下，最终得到了一个与MKMapView完美配合的解决方案，并且也应该与UIWebView配合使用

MKTouchAppDelegate.h

#import <UIKit/UIKit.h>@class UIViewTouch;@class MKMapView;@interface MKTouchAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    UIViewTouch *viewTouch;
    MKMapView *mapView;}@property (nonatomic, retain) UIViewTouch *viewTouch;@property (nonatomic, retain) MKMapView *mapView;@property (nonatomic, retain) IBOutlet UIWindow *window;@end

MKTouchAppDelegate.m

#import "MKTouchAppDelegate.h"#import "UIViewTouch.h"#import <MapKit/MapKit.h>@implementation MKTouchAppDelegate@synthesize window;@synthesize viewTouch;@synthesize mapView;- (void)applicationDidFinishLaunching:(UIApplication *)application {

    //We create a view wich will catch Events as they occured and Log them in the Console
    viewTouch = [[UIViewTouch alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

    //Next we create the MKMapView object, which will be added as a subview of viewTouch
    mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    [viewTouch addSubview:mapView];

    //And we display everything!
    [window addSubview:viewTouch];
    [window makeKeyAndVisible];}- (void)dealloc {
    [window release];
    [super dealloc];}@end

UIViewTouch.h

#import <UIKit/UIKit.h>@class UIView;@interface UIViewTouch : UIView {
    UIView *viewTouched;}@property (nonatomic, retain) UIView * viewTouched;- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;@end

UIViewTouch.m

#import "UIViewTouch.h"#import <MapKit/MapKit.h>@implementation UIViewTouch@synthesize viewTouched;//The basic idea here is to intercept the view which is sent back as the firstresponder in hitTest.//We keep it preciously in the property viewTouched and we return our view as the firstresponder.- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    NSLog(@"Hit Test");
    viewTouched = [super hitTest:point withEvent:event];
    return self;}//Then, when an event is fired, we log this one and then send it back to the viewTouched we kept, and voilà!!! :)- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touch Began");
    [viewTouched touchesBegan:touches withEvent:event];}- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touch Moved");
    [viewTouched touchesMoved:touches withEvent:event];}- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touch Ended");
    [viewTouched touchesEnded:touches withEvent:event];}- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touch Cancelled");}@end

我希望这对你们有所帮助！

干杯

Answer 3

UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleGesture:)];   tgr.numberOfTapsRequired = 2;tgr.numberOfTouchesRequired = 1;[mapView addGestureRecognizer:tgr];[tgr release];- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer{
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded)
        return;

    CGPoint touchPoint = [gestureRecognizer locationInView:mapView];
    CLLocationCoordinate2D touchMapCoordinate = [mapView convertPoint:touchPoint toCoordinateFromView:mapView];

    //.............}