iOS－动画的两种方式

第一种   头尾式动画

 [UIView beginAnimations:nil context:(nil)];
    [UIView setAnimationDuration:2];
    self.btnIcon.center = centerPoint;
    [UIView commitAnimations];


 [UIView beginAnimations:nil context:(nil)];
    [UIView setAnimationDuration:2];
    self.btnIcon.bounds = originBounds;
    [UIView commitAnimations];

第二种 block

    [UIView animateWithDuration:1.0
animations:^{
    self.btnIcon.center = centerPoint;
}];
}