我有以下代码，应该给出 View “摇动”的效果，然后通过向上滑出屏幕来消除它。
有时它呈现得很完美，但大多数时候摇动动画不会显示， View 只会向上滑动。我不知道问题出在哪里:
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];
最佳答案
您需要做的唯一更改是重新放置:
[[[self editView] layer] addAnimation:animation forKey:@"position"];
在[CATransaction commit]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，摇动部分将首先发生，然后才开始按照您想要的方式向上移动。
关于ios - CABasicAnimation 始终不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31979729/