Xamarin iOS UIButton如何以编程方式单击按钮？

Question

I'm attempting to fake the act of clicking a button, by programmatically calling it within my ViewWillAppear() function.

The onclick function is defined in my ViewDidLoad(), and you can see I am trying to use a Perform Selector to manually call the button.

The button does not appear to be running. Any ideas?

public override void ViewDidLoad()
{
    base.ViewDidLoad();

    idButtonScanLoad.TouchUpInside += async (sender, ea) =>
    {
        System.Console.WriteLine("Scan button pressed");
    };

}

[Export("TouchUpInsideEvent:")]
private void TouchUpInsideEvent(NSObject sender)
{
    Console.WriteLine("yay!");
}

public override void ViewWillAppear(bool animated)
{
    base.ViewWillAppear(animated);

    this.PerformSelector(new ObjCRuntime.Selector("TouchUpInsideEvent:"), this as NSObject, 10f);
}

Answer 1

这是答案，您应该从ViewDidLoad方法调用它。

myButton.SendActionForControlEvents (UIControlEvent.TouchUpInside);

Answer 2

If you want to create a button's click event, you can use the this

public override void ViewDidLoad()
{
     Mybutton.AddTarget(ButtonEventHandler, UIControlEvent.TouchUpInside);
}

public void ButtonEventHandler(object sender, EventArgs e)
{
    if(sender==Mybutton)
    {
       //do stuff here
    }
}