从自己的app跳转到QQ指定的聊天界面

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectZero];
    NSURL *url = [NSURL URLWithString:@"mqq://im/chat?chat_type=wpa&uin=2259403697&version=1&src_type=web"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    webView.delegate = self;
    [webView loadRequest:request];
    [self.view addSubview:webView];