一，app跳轉到safari

NSURL* url = [NSURL URLWithString:urlStr];
[[UIApplication sharedApplication] openURL:url];

二，跳轉到指定QQ號

判斷是否安裝qq

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"mqq://"]]) {
    NSLog(@"had installed");
}else{
    NSLog(@"no installed");
}

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectZero];    
NSURL*url = [NSURL URLWithString:@"mqq://im/chat?chat_type=wpa&uin=501863587&version=1&src_type=web"];
NSURLRequest*request = [NSURLRequest requestWithURL:url];
webView.delegate = self;
[webView loadRequest:request];
[self.view addSubview:webView];