Question

我遇到一个问题，当我点击我的按钮时，淡入淡出的动画无法正常显示淡入和淡出我的视图，视图会再次出现。

View在xib文件中设置为alpha值为＆＃34; 0＆＃34;

我的代码：

-(IBAction)startFade:(UIButton*)sender{
    UIView *searchView = [UIView safe_cast:[self.view viewWithName:@"searchField"]];
    [UIView animateWithDuration:2.f delay:0.f options:UIViewAnimationOptionCurveEaseIn animations:^{
        [searchView setAlpha:0.f];
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:2.f delay:0.f options:UIViewAnimationOptionCurveEaseInOut animations:^{
            [searchView setAlpha:1.f];
        } completion:nil];
    }];
}

Answer 1

第二个动画在第一个动画的完成处理程序中，所以每次都会做两个动画，你需要将第二个动画分开

尝试这样的事情

-(IBAction)startFade:(UIButton*)sender{
    UIView *searchView = [UIView safe_cast:[self.view viewWithName:@"searchField"]];
    //assuming searchView.alpha == 1 or 0 by default
    CGFloat alpha = searchView.alpha;
    [UIView animateWithDuration:2.f delay:0.f options:UIViewAnimationOptionCurveEaseIn animations:^{
        [searchView setAlpha:1.0f - alpha];
    } completion:nil];
}

这应该按每个按钮将其交换为隐藏或可见

淡出动画循环播放

1 个答案: