ios - CABasicAnimation 一直不工作

Question

我有以下代码，应该提供 View “摇晃”的效果，然后通过向上滑出屏幕来消除它。

有时完美呈现，但大多数时候摇动动画不会显示， View 只是向上滑动。我无法弄清楚问题可能是什么:

CABasicAnimation *animation =
        [CABasicAnimation animationWithKeyPath:@"position"];
        [animation setDuration:0.05];
        [animation setRepeatCount:8];
        [animation setAutoreverses:YES];
        [animation setFromValue:[NSValue valueWithCGPoint:
                                 CGPointMake([[self editView] center].x - 20.0f, [[self editView] center].y)]];
        [animation setToValue:[NSValue valueWithCGPoint:
                               CGPointMake([[self editView] center].x + 20.0f, [[self editView] center].y)]];
        [[[self editView] layer] addAnimation:animation forKey:@"position"];
        
        [CATransaction begin]; {
            [CATransaction setCompletionBlock:^{
                
                
                [UIView animateWithDuration:0.4f delay:0.7 options:UIViewAnimationOptionTransitionNone animations:^{
                    
                    _editView.center = CGPointMake(self.navigationController.view.bounds.size.width / 2, 0 - 380);
                    [_textView resignFirstResponder];
                    
                    [_tint setAlpha:0];
                    
                    
                } completion:^(BOOL finished) {
                    
                    [_editView removeFromSuperview];
                    [_tint removeFromSuperview];
                }];
                
            }];
            
} [CATransaction commit];

Answer 1

您唯一需要做的改变是重新放置:

[[[self editView] layer] addAnimation:animation forKey:@"position"];

在 [CATransaction commit]; 的正上方。

这样，就变成了:

[CATransaction begin];
{
    [CATransaction setCompletionBlock:^
    {
        [UIView animateWithDuration:0.4f delay:0.7f options:UIViewAnimationOptionTransitionNone animations:^
        {
            _editView.center = CGPointMake(self.navigationController.view.bounds.size.width / 2.0f, -380.0f);
           [_textView resignFirstResponder];
           [_tint setAlpha:0];
        }
        completion:^(BOOL finished)
        {
            [_editView removeFromSuperview];
            [_tint removeFromSuperview];
        }];
    }];
}
[[[self editView] layer] addAnimation:animation forKey:@"position"];
[CATransaction commit];

然后，摇晃部分将首先发生，然后才开始按照您的意愿向上动画。