Xcode--创建动画

1.动画（头部-开始动画）
[UIView beginAnimations:nil context:nil];

2.设置动画的执行时间
[UIView setAnimationDuration:1.0];

3.向上移动

// CGPoint tempCenter = _btn.center;
CGRect tempFrame = _btn.frame;

tempFrame.origin.y -= 50;

_btn.frame = tempFrame;  



3.左旋转45°   (transfrom 变形,改造)

//_btn.transfrom = CGAffineTransformMakeROtation(- M_PI_4);

_btn.transform = CGAffineTransformRotate(_btn.transform,- M_PI_4);

4.变大

//_btn.transform = CGAffineTransformMakeScale(1.2, 1.2);
_btn.transform = CGAffineTransformScale(_btn.transform, 1.2, 1.2);

5.透明度 (0-1)
_ben.alpha = 1;

6.动画（尾巴-提交动画-执行动画）
[UIView commitAnimations];


//清空之前所有的形变状态（消除以前的旋转、缩放等状态）
_btn.transform = CGAffineTransformIdentity;

方法二：
[UIView animateWithDuration:1.0 animations:^{
    rowView.frame = CGRectMake(0,20,100,40);
    rowView.alpha = 1;
}];

[UIView animateWithDuration:1.0 animations:^{
    rowView.frame = CGRectMake(0,20,100,40);
    rowView.alpha = 1;
} completion:^(BOOL finished){ //动画执行完毕后会自动调用这个block
    NSLog(@“哈哈”);
}];