一、UIView动画

     //UIView动画有开始beginAnimation，有结束commitAnimation

    //第一步：开始UIView动画

    [UIView beginAnimations:@"标识ID（可随意命名）" context:nil];

    //第二步：设置动画时长

    [UIView setAnimationDuration:3];

    //第三步：设置UIView动画的回调代理

    [UIView setAnimationDelegate:self];

    //第四步：设置相关的对象的frame（或者color，alpha等属性）

    _testView.frame = CGRectMake(100, 100, 200, 100);

    _testView.backgroundColor = [UIColor redColor];

    _testView.alpha = 0.2;

    //第五步：结束动画（提交动画效果）

    [UIView commitAnimations];

第三步满足回调协议后走协议方法：

//开始动画时的方法

- (void)animationWillStart:(NSString *)animationID context:(void *)context {

    NSLog(@"ID = %@,context = %@", animationID, context);

}

//结束动画时的方法

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

    NSLog(@"ID = %@,context = %@", animationID, context);

}

 

二、CoreAnimation动画

 1.layer的属性

#pragma mark - Layer的常用属性        /*    //设置图片为圆角    self.imageView.layer.cornerRadius = self.imageView.frame.size.width / 2;    //注意：光设置上边一句代码是实现不了效果的（masksToBounds这个属性影响layer层的阴影效果，导致阴影不显示）    //允许改变角度    //self.imageView.layer.masksToBounds = YES;        //设置layer的阴影颜色    self.imageView.layer.shadowColor = [UIColor redColor].CGColor;    //设置layer层的透明度    self.imageView.layer.shadowOpacity = 0.5f;    //设置阴影的偏移量    self.imageView.layer.shadowOffset = CGSizeMake(-20, 10);    //设置阴影的模糊度    self.imageView.layer.shadowRadius = 1.0f;        //需求：拖进来一个UIView设置它的阴影    self.myView.layer.shadowColor = [UIColor blackColor].CGColor;    self.myView.layer.shadowOpacity = 1;    self.myView.layer.shadowOffset = CGSizeMake(20, 0);    //self.imageView.layer.shadowRadius = 3;        */

 

2.各种动画实现方法步骤

• 声明方法名称
• 赋给对应动画操作的keyPath
• 设置动画操作需要的属性值
• 将该动画操作添加给图片的layer进行操作

#pragma mark - CASpringAnimation动画按钮的响应方法- (IBAction)springAnimation:(id)sender {        CASpringAnimation *springAnimation = [CASpringAnimation animation];        springAnimation.keyPath = @"transform.scale";    springAnimation.fromValue = @1;    springAnimation.toValue = @0.25;    springAnimation.duration = 3.0f;    [self.imageView.layer addAnimation:springAnimation forKey:@"springAnimation"];    }#pragma mark - CAAnimationGroup组动画按钮的响应方法- (IBAction)animationGroup:(id)sender {        //平移动画    CABasicAnimation *basicAnimation1 = [CABasicAnimation animation];    basicAnimation1.keyPath = @"transform.translation.y";    basicAnimation1.toValue = @(400);        //缩小动画    CABasicAnimation *basicAnimation2 = [CABasicAnimation animation];    basicAnimation2.keyPath = @"transform.scale";    basicAnimation2.toValue = @(0.2);        //旋转动画    CABasicAnimation *basicAnimation3 = [CABasicAnimation animation];    basicAnimation3.keyPath = @"transform.rotation";    basicAnimation3.toValue = @(M_PI);        //需要创建管理各个动画的动画组    CAAnimationGroup *group = [CAAnimationGroup animation];    group.animations = @[basicAnimation1, basicAnimation2, basicAnimation3];    group.duration = 5.0f;        [self.imageView.layer addAnimation:group forKey:@"groupAnimation"];        }#pragma mark - CAKeyframeAnimation动画按钮的响应方法- (IBAction)keyFrameAnimation:(id)sender {        //第一步：创建对象    CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animation];    //第二步：设置动画轨迹    keyFrameAnimation.keyPath = @"transform.rotation";    //第三步：设置旋转角度(弧度的计算公式：度数/180*π)（π = M_PI）    keyFrameAnimation.values = @[@(0 / 180.0 * M_PI), @(360 / 180.0 * M_PI)];    keyFrameAnimation.repeatCount = 3;    //第四步：设置时长    keyFrameAnimation.duration = 3.0f;    //第五步：添加动画到layer层    [self.imageView.layer addAnimation:keyFrameAnimation forKey:@"keyFrameAnimation"];        }#pragma mark - CABasicAnimation动画的响应方法- (IBAction)basicAnimation:(id)sender {        /***************移动效果***************/        //第一步：创建动画对象    CABasicAnimation *basicAnimation = [CABasicAnimation animation];    //第二步：告诉layer层需要执行什么样子的动画[后面设置的内容为CALayer的相关属性]    basicAnimation.keyPath = @"position";    //第三步：告诉layer从哪里来，到哪里去    basicAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(100, 100)];    basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(300, 300)];    //注意点：如果要实现移动到的位置不回到原来的位置，需要实现以下两句代码    basicAnimation.removedOnCompletion = NO;    //设置保存动画状态的内容    basicAnimation.fillMode = kCAFillModeForwards;    //第四步：设置动画持续时长    basicAnimation.duration = 4;    //第五步：将要执行的动画添加到calayer上    [self.imageView.layer addAnimation:basicAnimation forKey:@"basic1"];            /***************翻转效果***************/    CABasicAnimation *basic = [CABasicAnimation animation];    basic.keyPath = @"transform";    //设置翻转到的地方    basic.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI, 0, 0, 1)];    basic.duration = 2.0f;    [self.imageView.layer addAnimation:basic forKey:@"basic2"];        //根据key去除移除动画//    [self.imageView.layer removeAnimationForKey:@"basic1"];            }