无法在 UIWebView IOS 5 中捕获触摸

Posted 2023-02-23

【中文标题】无法在 UIWebView IOS 5 中捕获触摸

【英文标题】：Unable to capture touch in UIWebView IOS 5

【发布时间】：2012-07-20 07:04:10

【问题描述】：

我是 iPhone 开发者的新手，

TouchCapturingWindow.h

@interface TouchCapturingWindow : UIWindow
 
       NSMutableArray *views;

       @private
       UIView *touchView;

- (void)addViewForTouchPriority:(UIView*)view;
- (void)removeViewForTouchPriority:(UIView*)view;
@end

TouchCapturingWindow.m

 (void)addViewForTouchPriority:(UIView*)view
 
    if ( !views ) views = [[NSMutableArray alloc] init];
    [views addObject:view];

- (void)removeViewForTouchPriority:(UIView*)view 

    if ( !views ) return;
    [views removeObject:view];

- (void)sendEvent:(UIEvent *)event 
 
    UITouch *touch = [[event allTouches] anyObject];
    if (touch.phase == UITouchPhaseBegan) 
    
        for ( UIView *view in views ) 
        
            if ( ![view isHidden] && [view pointInside:[touch locationInView:view] withEvent:event] ) 
            
                touchView = view;
                [touchView touchesBegan:[event allTouches] withEvent:event];
                break;
            
        
    
    else if (touch.phase == UITouchPhaseMoved) 
    
        if ( touchView ) 
        
            [touchView touchesMoved:[event allTouches] withEvent:event];
        
    
    else if (touch.phase == UITouchPhaseCancelled) 
    
        if ( touchView ) 
        
            [touchView touchesCancelled:[event allTouches] withEvent:event];
            touchView = nil;
        
    
    else if (touch.phase == UITouchPhaseEnded) 
    
        if ( touchView ) 
        
            [touchView touchesEnded:[event allTouches] withEvent:event];
            touchView = nil;
        
    
    [super sendEvent:event];

@end

DownloadPage.m

- (void)viewDidLoad

    [super viewDidLoad];   
    CGRect webFrame = CGRectMake(0.0, 0.0, 500.0, 500.0);
    webView = [[UIWebView alloc] initWithFrame:webFrame];
    [webView setBackgroundColor:[UIColor greenColor]];
    NSString *urlAddress = @"http://***.com/";
    NSURL *url = [NSURL URLWithString:urlAddress];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [webView loadRequest:requestObj];
    [self.view addSubview:webView]; 
    NSString *t= [webView stringByEvaluatingjavascriptFromString:@"window.getSelection().toString()"];
    NSLog(@"selected text=%@",t);

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event 
 
       NSLog(@"Touches began"); 
 
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event      
 
      NSLog(@"Touches moved"); 
  
- (void) touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event 
  
      NSLog(@"Touches ended"); 
 
- (void) touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event 
  
      NSLog(@"Touches cancelled"); 
 

我们将不胜感激。

【参考方案1】：

这是一个古老的“问题”。

我这样做的方法是为您的 html 按钮或您希望的任何元素添加一个链接。

然后实现这个 UIWebView 委托方法（不要忘记在你的 h 文件中添加 UIWebViewDelegate）。当在 webview 中按下链接时会调用此方法，以便您可以根据自己的需要使用它：

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


    //Do what ever you want here


    //prevent the web View from loading the link
    return NO;

顺便说一句 您可以使用NSURL *url = request.URL; 来检查 URL，如果您有想要激活的链接，或者您有多个想要实施的操作。

【讨论】：

我没有收到您的代码，您能否建议我应该对我的代码进行哪些更改？