核心动画

1. 无缝动画

- (void)awakeFromNib {
    iphone每秒刷新60次, 屏幕刷新的时候就会触发
    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:selfselector:@selector(setNeedsDisplay)];
    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
}

- (void)drawRect:(CGRect)rect {
    
    self.snowY += 1;
    
雪花"];
将image 放在 view上的某一点上
    [image drawAtPoint:CGPointMake(0, self.snowY)];
    
    if (self.snowY > self.frame.size.height) {
        self.snowY = 0;
    }
}

2. CATransition

CATransition *animation = [CATransition animation];
    
动画种类
animation.type = @"pageCurl";

 //typedef enum : NSUInteger {
淡入淡出
推挤
揭开
覆盖
立方体
吮吸
翻转
波纹
翻页
反翻页
开镜头
关镜头
下翻页
上翻页
左翻转
右翻转
 //
 //} AnimationType;
 
 
    
动画种类的模式
animation.subtype = subtype;
 
// CA_EXTERN NSString * const kCATransitionFromRight
// CA_EXTERN NSString * const kCATransitionFromLeft
// CA_EXTERN NSString * const kCATransitionFromTop
// CA_EXTERN NSString * const kCATransitionFromBottom
 
 
    
animation.duration = 0.5;
    
[self.imageView.layer addAnimation:animation forKey:nil];
 
 
 
移除self.imageView.layer上的 所有动画
[self.imageView.layer removeAllAnimations];

3. CABasicAnimation

CABasicAnimation *animation1 = [CABasicAnimation animation];
animation1.keyPath = @"transform.rotation";
animation1.toValue = @M_PI_2;
        
CABasicAnimation *animation2 = [CABasicAnimation animation];
animation2.keyPath = @"transform.scale";
animation2.toValue = @0.5;
    
CABasicAnimation *animation3 = [CABasicAnimation animation];
animation3.keyPath = @"position";
animation3.toValue = [NSValue valueWithCGPoint:CGPointMake(100, 250)];
    
//  创建动画组
CAAnimationGroup *group = [CAAnimationGroup animation];

//  动画数组
group.animations = @[animation1, animation2, animation3];
group.duration = 2;

// 保持动画结束效果
group.removedOnCompletion = NO;
group.fillMode = kCAFillModeForwards;
    
[self.redView.layer addAnimation:group forKey:nil];
    
// self.view  执行 UIViewAnimationOptionTransitionCurlUp  动画
[UIView transitionWithView:self.view duration:0.5 options:UIViewAnimationOptionTransitionCurlUp animations:nil completion:nil];

4. CAKeyframeAnimation

CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
        
// 动画要修改的属性 的
animation.keyPath = @"transform.rotation";
        
// 动画要修改的属性 的
animation.values = @[@(angleWithRotation(-5)), @(angleWithRotation(5)), @(angleWithRotation(-5))];
        
animation.duration = 0.5;
        
animation.repeatCount = MAXFLOAT;
        
// 动画结束后不移除动画效果
animation.removedOnCompletion = NO;
        
// 向图层添加 动画
[self.imageView.layer addAnimation:animation forKey:nil];

5. 图层动画

添加涂层
 - (void)createLayer {
 创建一个涂层
     CALayer *layer = [CALayer layer];
     
 设置尺寸(涂层的大小)
     layer.bounds = CGRectMake(0, 0, 100, 100);
     
    // 设置位置(锚点显示在position上)
     layer.position = CGPointMake(100, 100);
     
 设置颜色
     layer.backgroundColor = [UIColor redColor].CGColor;
     
 设置内容
阿狸头像"].CGImage;
     
 
 绕锚点旋转
    layer.anchorPoint = CGPointMake(0.5, 1);
 
 
 
     [self.mainView.layer addSublayer:layer];
     
 }
 
 
 
 
 
[UIView animateWithDuration:0.5 animations:^{
        
 缩放
    self.mainView.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1);
        
 平移
    self.mainView.layer.transform = CATransform3DMakeTranslation(100, 100, 100);
        
 旋转
    self.mainView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 1, 0);
 
}];

6.CABasicAnimation

CABasicAnimation *animation = [CABasicAnimation animation];
    
// 动画修改的属性 的
animation.keyPath = @"transform.scale";
    
// 动画修改的属性 的
animation.toValue = @0.5;
    
// 动画时长
animation.duration = 0.5;
    
// 动画重复次数
animation.repeatCount = MAXFLOAT;
    
// 动画结束后不移除动画效果
animation.removedOnCompletion = NO;
    
// 保持最新的位置
animation.fillMode = kCAFillModeForwards;
    
// 给图层添加动画
[self.layer addAnimation:animation forKey:nil];