iphone之点击UIWebView中链接调用Safari打开目标链接

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

{

    NSURL *requestURL =[ [ request URL ] retain ];

    if ( ( [ [ requestURL scheme ] isEqualToString: @"http" ] || [ [ requestURL scheme ] isEqualToString: @"https" ] || [ [ requestURL scheme ] isEqualToString: @"mailto" ])
        && ( navigationType == UIWebViewNavigationTypeLinkClicked ) ) {
        return ![ [ UIApplication sharedApplication ] openURL: [ requestURL autorelease ] ];
    }
    [ requestURL release ];
    return YES;
}

二、

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

{

    if (navigationType==UIWebViewNavigationTypeLinkClicked) {

        NSString *currentUrl=request.URL.absoluteString;

        [self applicationWebLoad:currentUrl];

        return NO;

    }

    return YES;

}

-(void)applicationWebLoad:(NSString *)urlString

{

    UIApplication *application=[UIApplication sharedApplication];

    NSURL *url =[NSURL URLWithString:urlString];

    if ([application canOpenURL:url]) {

        [application openURL:url];

    }

    else

    {

        NSLog(@"open url failed");

    }

}

*需要注意的是，-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 这个方法，会在发起请求 loadRequest后调用，而且调用的次数也不是一次，直到加载完毕 

返回值为no表示不加载

一般情况我们把加载方法写在了viewWillAppear中，点击webview中的链接，调用safari，当我们回到我们的应用中，当前WebView就会重新加载到别的页面（点击后的），而这是通常是不允许的，所以就可以使用上面的方法。