如何使用 MonoTouch 为 UIButton Alpha 属性设置动画 [英] How can I animate a UIButton Alpha property with MonoTouch

问题描述

我有一个带有 Alpha 属性的简单 UIButton，我想将它从 1.0f 动画到 0.0f，然后再回到 1.0f.这基本上是响应 TouchDown.

I have a simple UIButton with an Alpha property that I would like to animate from 1.0f to 0.0f, and then back to 1.0f. This is basically responding to TouchDown.

另外，如果我调用的例程不在主线程上(在 ThreadPool 上调用异步委托)，我需要做什么特别的事情吗?

Also, is there anything special I need to do if the routine I am calling from is not on the main thread (async delegate invoked on the ThreadPool)?

我应该使用 CAAnimation 吗?

Should I use CAAnimation?

谢谢！

推荐答案

除非有人用单一的方式来做这件事，否则我说使用:

Unless someone pipes up with a mono way to do it, I say use:

- (void) pulseButton {
    button.alpha = 0.0;
    [UIView beginAnimations:nil context:button]; {
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(makeVisibleAgain:finished:context:)];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        [UIView setAnimationDuration:0.50];
        button.alpha = 0.0;
    } [UIView commitAnimations];
}
- (void)makeVisibleAgain:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
    UIButton *button = ((UIButton *) context);
    [UIView beginAnimations:nil context:nil]; {
        [UIView setAnimationDelegate:nil];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
        [UIView setAnimationDuration:0.5];
        button.alpha = 1.0;
    } [UIView commitAnimations];

}

这篇关于如何使用 MonoTouch 为 UIButton Alpha 属性设置动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！