小编Jre*_*ros的帖子

我正在研究UIButton动画,其中:

它UIButton位于屏幕的底部中央,缩小为小尺寸

_menuBtn.transform = CGAffineTransformMakeScale(0.1f, 0.1f);

当应用程序启动时,它应该移动到屏幕的左下方,因为它会缩放或增长到原始大小.

- (void)viewDidLoad
{
    [super viewDidLoad];

    _menuBtn.frame = CGRectMake(160, 513, 30, 30); 
    _menuBtn.superview.frame = CGRectMake(160, 513, 30, 30);

    _menuBtn.transform = CGAffineTransformMakeScale(0.1f, 0.1f);
    NSLog(@"_menuBtn: %@ ; _menuBtn.superview: %@", _menuBtn, _menuBtn.superview);
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:5];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    CGAffineTransform scaleTrans  = CGAffineTransformMakeScale(1.0f, 1.0f);
    CGAffineTransform lefttorightTrans  = CGAffineTransformMakeTranslation(-200.0f,0.0f);
    _menuBtn.transform = CGAffineTransformConcat(scaleTrans, lefttorightTrans);
    [UIView commitAnimations];

}

问题

当动画开始时,按钮开始从屏幕的右下方开始移动,而不是在它应该是的底部中心.有帮助吗？

记录结果

NSLog(@"%@", _myBtn);

2013-08-14 09:22:38.913 GJCoolNavi[339:c07] <UIButton: 0x813ea30; frame = (0 0; 0 0); opaque = …