处理UIWebview中的触摸

Question

我创建的一个子类UIWebView,并且已经实施了 touchesBegan,touchesMoved和touchesEnded方法.

但是webview子类不处理touch事件.

是否有任何方法来处理UIWebView子类内的触摸事件???

Answer 1

不需要子类化,只需添加一个UITapGestureRecognizer:

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapMethod)];
[tap setNumberOfTapsRequired:1]; // Set your own number here
[tap setDelegate:self]; // Add the <UIGestureRecognizerDelegate> protocol

[self.myWebView addGestureRecognizer:tap];

<UIGestureRecognizerDelegate>在头文件中添加协议,并添加此方法:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

Answer 2

如果您只需要处理手势,同时保持UIWebView的其余功能不变,您可以继承UIWebView并使用此策略:

在UIWebView子类的init方法中,添加手势识别器,例如:

UISwipeGestureRecognizer  * swipeRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGestureRightMethod)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[self addGestureRecognizer:swipeRight];
swipeRight.delegate = self;

然后,将此方法添加到您的类:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

添加并处理指定的选择器到类,在本例中为"handleSwipeGestureRightMethod",你很高兴...

Answer 3

你可以把一个UIView在你的UIWebView,并在此改变touchesDidBegin等,然后将它们发送到您的网页流量.例如:

用户接触你UIView,这会激起你的兴趣

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{  
    // Execute your code then send a touchesBegan to your webview like so:
[webView touchesBegan:touches withEvent:event];
return;
}

你UIView必须通过webview.

Answer 4

我不确定这是不是你想要的(这不是你要求的,但它可能会取决于你的最终游戏是什么),但你可以从UIWebView内部解释JavaScript的触摸,并获得javascript到做

document.location='http://null/'+xCoord+'/'+yCoord; // Null is arbitrary.

然后,您可以使用UIWebView的委托方法捕获它

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

如果request.URL.host(或其他任何东西)isEqualToString:@"null"采取相关的操作(并返回NO而不是YES).您甚至可以通过执行以下操作将JS添加到每个页面:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
  [webView stringByEvaluatingJavaScriptFromString:@"window.ontouchstart=function(/* ... */);"];
}

希望这可以帮助？

Answer 5

你的意思是当调用touchesBegan、touchesMoved和touchesEnded时你的子类实现不会被调用？

这听起来像是您创建对象实例的方式有问题。我认为需要更多细节。

（采取评论形式）

头文件

#import <UIKit/UIKit.h> 

@interface MyWebView : UIWebView { } @end 

实施文件

#import "MyWebView.h" 

@implementation MyWebView 

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

- (void)drawRect:(CGRect)rect { 
    NSLog(@"MyWebView is loaded"); 
} 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
   NSLog(@"touches began"); 
} 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
    NSLog(@"Touches ended");     
} 

- (void)dealloc { 
   [super dealloc]; 
} 

@end