动画 UIView 大小跳跃

Question

想要通过改变 UIView 的高度和位置来为它设置动画。第一个动画跳跃？我在 Storyboards 中将 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，它的高度迅速跃升至 200+ 像素，然后按应有的动画效果？

- (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

尝试移动线条

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

在街区外。放在调用动画方法之前。