IOS-官方文档CGAffineTransform（旋转，缩放，平移）

1.旋转
方法原型

CGAffineTransform CGAffineTransformMakeRotation ( CGFloat angle );
//旋转

代码实例

self.view.backgroundColor = [UIColor whiteColor];

    UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 55, 20)];
    title.center = CGPointMake(100,200);
    title.text = @"公告";
    title.textColor = [UIColor redColor];
    title.font = [UIFont systemFontOfSize:10.0f];
    title.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:title];

    [UIView animateWithDuration:3.0
                     animations:^{
                         title.transform = CGAffineTransformRotate(CGAffineTransformScale(title.transform, 1.5, 1.5), -0.2*M_PI); //缩放+旋转
                     }];

2.缩放
方法原型

CGAffineTransform CGAffineTransformMakeScale ( CGFloat sx, CGFloat sy );
//缩放

代码实例

View animateWithDuration:3.0
                     animations:^{
                         title.transform=CGAffineTransformScale(title.transform, 1.0, 2.0); //实现的是放大和缩小
                     }];

3.平移
方法原型

CGAffineTransform CGAffineTransformMakeTranslation ( CGFloat tx, CGFloat ty ); //平移

代码实例

[UIView animateWithDuration:3.0
                     animations:^{
                         title.transform=CGAffineTransformTranslate(title.transform, 20, 20); //平移
                     }];