动画UIView大小跳跃

Question

通过改变其高度和位置来制作UIView的动画。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。我点击View，它会快速跳到200+像素，然后按照它应该动画？

- (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。在调用动画方法之前把它放。