iOS动画：UIView动画和CALayer动画（CABasicAnimation、CAKeyframeAnimation的使用）

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//参数1 动画名称 参数2 要实现动画的对象上下文

    [UIView beginAnimations:@"attribute" context:_showImageView];

    //设置动画的时间

    [UIView setAnimationDuration:1.0f];

    //设置动画延迟时间

//    [UIView setAnimationDelay:2];

    //设置视图center 实现试图移动动画

    _showImageView.center = CGPointMake(100, 100);

    //设置alpha值:视图透明度

    _showImageView.alpha = 0.2f;

    //设置背景颜色

    _showImageView.backgroundColor = [UIColor greenColor];

    //UIView动画 设置代理

    [UIView setAnimationDelegate:self];

    //动画将要开始代理方法

    [UIView setAnimationWillStartSelector:@selector(animationWillStart:context:)];

    //动画已经结束代理方法

    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];

    //提交动画设置，执行动画

    [UIView commitAnimations];

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//UIView动画， 使用Block实现

    [UIView animateWithDuration:1.0f animations:^{

        //通过设置translation 实现视图的偏移

        if ([self.mySwitch isOn]) {

            //基于上一次的translation

            _showImageView.transform = CGAffineTransformTranslate(_showImageView.transform, 50, 0);

        } else {

            //基于原始的translation

            _showImageView.transform = CGAffineTransformMakeTranslation(-50, 0);

        }

    }];

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//CABasic 有两个属性 fromValue 动画开始值，toValue动画结束值

    CABasicAnimation *animation1 = [CABasicAnimation animationWithKeyPath:@"position"];

    [animation1 setDuration:2];

    animation1.fromValue = [NSValue valueWithCGPoint:CGPointMake(150, 150)];

    animation1.toValue = [NSValue valueWithCGPoint:CGPointMake(200, 200)];

    [_imageView.layer addAnimation:animation1 forKey:@"position"];

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//创建组动画对象

    CAAnimationGroup *group = [CAAnimationGroup animation];

    //CABasic动画

    CABasicAnimation *animation1 = [CABasicAnimation animationWithKeyPath:@"transform.scale.y"];

    animation1.fromValue = @1.5;

    animation1.toValue = @0.5;

    //关键帧动画

    CAKeyframeAnimation *animation2 = [CAKeyframeAnimation animationWithKeyPath:@"position"];

    animation2.values = @[[NSValue valueWithCGPoint:CGPointMake(100, 100)],

                         [NSValue valueWithCGPoint:CGPointMake(200, 150)],

                         [NSValue valueWithCGPoint:CGPointMake(100, 200)],

                         [NSValue valueWithCGPoint:CGPointMake(200, 250)]];

    //group添加动画数组，group中动画对象并发执行

    [group setAnimations:@[animation1, animation2]];

    [group setDuration:4.0f];

    [_imageView.layer addAnimation:group forKey:@"group"];