UIKit框架（3）UIView的动画处理方式

//标识动画的开始位置
+ (void)beginAnimations:(NSString *)animationID context:(void *)context
//标识动画的结束位置，并开始动画
+ (void)commitAnimations
//设置动画执行时间，单位为秒
+ (void)setAnimationDuration:(NSTimeInterval)duration
//动画重复次数，默认为1
+ (void)setAnimationRepeatCount:(float)repeatCount

CGRect frame = self.btn.frame;
frame.size.width *= 1.2;
frame.size.height *= 1.2;
[UIView beginAnimations:@"btn" context:nil];
[UIView setAnimationDuration:0.5];
self.btn.frame = frame;
[UIView commitAnimations];

+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations
+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delayoptions:(UIViewAnimationOptions)options animations:(void (^)(void))animationscompletion:(void (^)(BOOL finished))completion

CGRect frame = self.btn.frame;
frame.size.width *= 1.2;
frame.size.height *= 1.2;
[UIView animateWithDuration:0.5 animations:^{
self.btn.frame = frame;
}];

//位置形变
CGAffineTransform CGAffineTransformMakeTranslation ( CGFloat tx, CGFloat ty );
//尺寸形变
CGAffineTransform CGAffineTransformMakeScale ( CGFloat sx, CGFloat sy );
//旋转形变
CGAffineTransform CGAffineTransformMakeRotation ( CGFloat angle );

//位置形变
CGAffineTransform CGAffineTransformTranslate ( CGAffineTransform t, CGFloat tx,CGFloat ty );
//尺寸形变
CGAffineTransform CGAffineTransformScale ( CGAffineTransform t, CGFloat sx,CGFloat sy );
//旋转形变
CGAffineTransform CGAffineTransformRotate ( CGAffineTransform t, CGFloat angle );

CGAffineTransform transform = CGAffineTransformScale(self.btn.transform, 1.2, 1.2);
[UIView beginAnimations:@"btn" context:nil];
[UIView setAnimationDuration:0.5];
self.btn.transform = transform;
[UIView commitAnimations];

const CGAffineTransform CGAffineTransformIdentity;