IOS每日学习7.30 IOS动画之UIView动画

目前ios动画主要分两种，一种是基于UIView的动画，一种是Core Animation，今天先讨论UIView动画。

实际上，在UIKIt框架内的UIView动画还是基于Core Animation封装的，只不过面对开发者来说，更简单了一些。UIView的动画是改变UIView以下属性产生的：

1.@porperty frame   在父视图中位置和大小

2.@property bounds 基于本地坐标的位置和大小

3.@property center  视图的中心点

4.@property transform  视图的变化矩阵

5.@property alpha  视图的透明度

6.@property backgroundColor  背景色

UIView动画函数有以下几个：

+ (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)delay options:(UIViewAnimationOptions)options animations:(void(^)(void))animations completion:(void(^)(BOOLfinished))completion;

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatio initialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;

这些函数使用起来都比较简单，上代码

[UIViewanimateWithDuration:2animations:^(void){

[self.tempImgViewsetFrame:CGRectMake(frame.origin.x+200, frame.origin.y-150, frame.size.width, frame.size.height)];

}completion:nil];//改变图片的位置，产生移动的动画效果

CGRectnewRect=CGRectMake(0, 0, 120, 200);

[UIViewanimateWithDuration:2animations:^(void){

[self.tempImgViewsetBounds:newRect];

}completion:^(BOOLflag){

[UIViewanimateWithDuration:2animations:^(void){

[self.tempImgViewsetBounds:bounds];

}completion:nil];

}];//改变图片的bounds属性，使图片先变大在变回原样

self.tempImgView.image=[UIImageimageNamed:@"wukong"];

[UIViewanimateWithDuration:2animations:^(void){

self.tempImgView.transform=CGAffineTransformMakeScale(0.6, 0.6);

}completion:^(BOOLflag){

self.tempImgView.image=[UIImageimageNamed:@"bee"];

}

];//使图片变小，然后改变图片内容

self.tempImgView.image=[UIImageimageNamed:@"wukong"];

[UIViewanimateWithDuration:2animations:^(void){

self.tempImgView.alpha=0.1 ;

}completion:nil];//使图片变透明