我們在開發APP 的過程中會經常遇到這樣的需求，跳轉到客服QQ界面，撥打電話等，直接上代碼

1.關于APP跳轉到客服QQ界面

 // 空白的webview
   UIWebView * webView = [[UIWebView alloc] initWithFrame:CGRectZero];
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"mqq://"]]) {
    
    //1691838426 是QQ號
    
    NSString * string = @"mqq://im/chat?chat_type=wpa&uin=1691838426&version=1&src_type=web";
    
    UIAlertController *actionSheet = [UIAlertController alertControllerWithTitle:@"shipping要打開你的QQ" message:nil preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *callAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:string]]];
    }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    }];
    
    [actionSheet addAction:cancelAction];
    [actionSheet addAction:callAction];
    [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:actionSheet animated:YES completion:nil];
    [[UIApplication sharedApplication].keyWindow.rootViewController.view addSubview:webView];
    
}else{
    
    UIAlertView*ale=[[UIAlertView alloc] initWithTitle:@"提示" message:@"您沒有安裝手機QQ，請安裝手機QQ后重試，或用PC進行操作。" delegate:self cancelButtonTitle:nil otherButtonTitles:@"確定", nil];
    [ale show];
    
}

2.關于APP直接撥打電話又三種實現方式

• 第一種：直接撥打電話，沒有提示
  //撥打電話
  UIApplication *ac = [UIApplication sharedApplication];

    NSURL *url = [NSURL URLWithString:[@"tel://"   stringByAppendingString:@"你要放的電話號碼"]];
  
    [ac openURL:url];
  

• 第二種：打完電話后還會回到原來的程序，也會彈出提示，
  NSMutableString * str=[[NSMutableString alloc] initWithFormat:@"tel:%@",@"你要放的電話號碼"];
  UIWebView * callWebview = [[UIWebView alloc] init];
  [callWebview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:str]]];
  [self.view addSubview:callWebview];

• 第三種： 打完電話后還會回到原來的程序，也會彈出提示，
  NSMutableString * str=[[NSMutableString alloc] initWithFormat:@"telprompt://%@",@"你要放的電話號碼"];
  [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];