在练习缩放旋转UIButton控件时，出现点击控件x,y同时增加或者减一定像素，经过查找是xcode5开启了Auto Layout.
放大缩小的代码
- (IBAction)btnScale:(UIButton *)sender {
//动画开始，设置执行时间
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
int tag = [sender tag];
float scale = tag == 8? 1.2: 0.8;
//CGAffineTransform _transform = _btn.transform;
_btn.transform = CGAffineTransformScale(_btn.transform, scale, scale);
//_transform = _btn.transform;
//提交动画
[UIView commitAnimations];
}
左右旋转的代码
- (IBAction)btnRotate:(UIButton *)sender {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
int tag = [sender tag];
int rotate = tag == 7? 1: -1;
_btn.transform = CGAffineTransformRotate(_btn.transform, M_PI_4*rotate);
//int rotate = tag==7? 1: -1;
//_btn.transform = CGAffineTransformRotate(_btn.transform, M_PI_4*rotate);
[UIView commitAnimations];
}
还原控件的操作
- (IBAction)btnReset:(UIButton *)sender {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
sender.transform = CGAffineTransformIdentity;
[UIView commitAnimations];
}
iOS缩放、旋转UIButton,布布扣,bubuko.com
原文：http://www.cnblogs.com/qifeng/p/3925537.html