动画UIView大小跳跃

Question

通过更改UIView的高度和位置来使其动画化。 第一个动画跳了吗？ 我将故事板中设置的UIView（theView）的大小设置为216的高度。因此，应用程序加载并显示theView。 我单击theView，它的高度迅速跳升到200+像素，然后按需要进行动画处理？

- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
UIView *view = singleTap.view;
[UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear | UIViewAnimationOptionAllowUserInteraction animations:^{
    CGRect theFrame = self.theView.frame;
    theFrame.size.height += 100.f;  <!-- when it hits here the view jumps then animates
    self.theView.frame = theFrame;
}
                 completion:^(BOOL finished) {
                     if(finished){
                         [UIView animateWithDuration:1.2 delay:0 options:UIViewAnimationCurveLinear | UIViewAnimationOptionAllowUserInteraction animations:^{
                             CGRect theFrame = self.theView.frame;
                             theFrame.origin.y -= 100.f;
                             self.theView.frame = theFrame;
                         }
                                          completion:^(BOOL finished) {
                                              NSLog(@"animations complete");
                                          }];
                     }
                 }];

}

Answer 1

尝试移动线

CGRect theFrame = self.theView.frame;
theFrame.size.height += 100.f;  <!-- when it hits here the view jumps then animates

在街区之外。 将其放在动画方法调用之前。