触摸时淡出UIButton

Question

我有一个选择状态和一个UIButton的正常状态,它们都是UIImages.触摸按钮时,我希望它能够达到选定状态,然后在一秒钟内恢复正常状态.按下UIButton*btn时,我设置了以下动画,但它只是再次切换回取消选择状态.我该如何实现这一目标？

[btn setSelected:YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0f];
[btn setSelected:NO];
[UIView commitAnimations];

干杯

聂

Answer 1

既然selected不是动画属性,那就行不通(正如你所发现的那样).我的解决方案是让btn的选定状态位于完全相同位置的按钮下方的单独UIImageView中.然后在点击按钮的操作中:

- (void) tapButton:(UIButton *)btn {
    btn.alpha = 0;
    [[UIApplication sharedApplication] beginIgnoringInteractionEvents];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1];
    [UIView setAnimationDelegate:[UIApplication sharedApplication]];
    [UIView setAnimationDidStopSelector:@selector(endIgnoringInteractionEvents)];
    btn.alpha = 1;
    [UIView commitAnimations];
}

注意我还添加了begin/endIgnoringInteractionEvents调用,因此用户在淡入恢复正常状态时无法点击按钮.如果您想允许,请使用更换begin/end呼叫[UIView setAnimationBeginsFromCurrentState];