UIWebView 屏蔽 alert警告框

如果是网页内容里面的alert,我们可以等网页加载完毕,也就是在webViewDidFinishLoad中执行下面的js代码,就可以屏蔽alert了

 

[myWebView stringByEvaluatingJavaScriptFromString:@"window.alert=null;"];

但上面的方法对于网页onLoad事件里面的alert就不起作用了

解决方法就是给UIWebView添加一个类别:

给工程添加JavaScriptAlert.h

@interface UIWebView (JavaScriptAlert) 

- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame;

- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame;

@end

给工程添加JavaScriptAlert.m文件

@implementation UIWebView (JavaScriptAlert)

- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame {

    /*

     UIAlertView* dialogue = [[UIAlertView alloc] initWithTitle:nil message:message delegate:nil cancelButtonTitle:@"好" otherButtonTitles:nil];

     [dialogue show];

     [dialogue autorelease];

     */

}

- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame{

   return NO;

}

@end

其实runJavaScriptAlertPanelWithMessage和runJavaScriptConfirmPanelWithMessage是WebUIDelegate的成员函数,详情可以查阅WebUIDelegate的帮助文档