What does the completion handler look like in C# when trying to animate?

Question

I want translate this code

[UIView animateWithDuration:0.25
    animations:^{
        self.datePicker.alpha = 0.0f;
    }
    completion:^(BOOL finished){
        self.datePicker.hidden = YES;
    }
];

to Xamarin iOS:

UIView.Animate (0.25,
    animation: () => {
        this.datePicker.Alpha = 0.0f;
    },
    completion: (finished){
        this.datePicker.Hidden = true;
    }
);

The problem is in the completion block. How do I use the bool finished here?

I get

Unexpected Symbol {

Answer 1

It's basic lambda expression.

UIView.Animate (0.25,
    animation: () => {
        this.datePicker.Alpha = 0.0f;
    },
    completion: () => {
        this.datePicker.Hidden = true;
    }
);

Or since you have only one statement in your body, you can cut it down even further to

UIView.Animate (0.25,
    animation: () => this.datePicker.Alpha = 0.0f,
    completion: () => this.datePicker.Hidden = true
);

Answer 2

Use UIView.AnimateNotify() to get the delegate for the completion handler that uses the bool parameter.