c# - 打电话 ios xamarin

Question

我目前在表格 View 中有一个按钮。我有一个自定义单元格类和一个更新单元格方法。

public void UpdateCell (string subtitle2)
{               
    call.SetTitle(subtitle2, UIControlState.Normal);
    call.TouchUpInside += (object sender, EventArgs e) => {
        UIApplication.SharedApplication.OpenUrl(new NSUrl("tel:" + subtitle2));
    };          
}

但是，当我运行这段代码时，出现错误。

Could not initialize an instance of the type 'MonoTouch.Foundation.NSUrl': the native 'initWithString:' method returned nil. It is possible to ignore this condition by setting MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure to false.

Answer 1

试试这个:

public void UpdateCell (string subtitle2)
{
    //Makes a new NSUrl
    var callURL = new NSUrl("tel:" + subtitle2);

    call.SetTitle(subtitle2, UIControlState.Normal);
    call.TouchUpInside += (object sender, EventArgs e) => {
    if (UIApplication.SharedApplication.CanOpenUrl (callURL)) {
    //After checking if phone can open NSUrl, it either opens the URL or outputs to the console.

        UIApplication.SharedApplication.OpenUrl(callURL);
    } else {
    //OUTPUT to console

    Console.WriteLine("Can't make call");
    }
  };          
}

不确定是否可以在 iPhone 模拟器中模拟电话调用，否则只需连接您的设备:-)