核心动画

一、瑕疵抖动效果

这种抖动的幅度很大。

    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    
    anim.keyPath = @"transform.rotation";
    
    // 1. 抖動幅度
    anim.values = @[@(angle2Radion(-5)),@(angle2Radion(5))];
    
    // 2. 一直抖動
    anim.repeatCount = MAXFLOAT;
    
    [_imageV.layer addAnimation:anim forKey:nil];

二、 正常抖动

只需要 把下方这句代码 改一下就OK

    // 把这句代码改成 
    anim.values = @[@(angle2Radion(-5)),@(angle2Radion(5))];

    // 改成这句代码
    anim.values = @[@(angle2Radion(-5)),@(angle2Radion(5)),@(angle2Radion(-5))];

三、把抖动效果的原点由图片的中心点改成 左上角

 _imageV.layer.anchorPoint = CGPointZero;

四、摆动

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _imageV.layer.anchorPoint = CGPointZero;
}
// 抖动效果
- (void)DouDongXiaoGuo
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    
    anim.keyPath = @"transform.rotation";
    
    // 1. 抖動幅度还可以使用path
    anim.path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 5, 5)].CGPath;
    
    anim.duration = 1;
    // 2. 一直抖動
    anim.repeatCount = MAXFLOAT;
    
    [_imageV.layer addAnimation:anim forKey:nil];
}

五、position 的画圆

   CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    
    anim.keyPath = @"position";
    
    // 1. 抖動幅度还可以使用path
    anim.path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, 100, 100)].CGPath;
    
    anim.duration = 1;
    // 2. 一直抖動
    anim.repeatCount = MAXFLOAT;
    
    [_imageV.layer addAnimation:anim forKey:nil];

六、跟随用户所画的线条移动位置

1. 在SB中拖动一个UIView .

2. class : WYGrayBgView 类.

3. 在ViewController中不写任何代码。

@interface WYGrayBgView ()
@property (nonatomic,strong) UIBezierPath   *path;
@end

@implementation WYGrayBgView
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    // 获取手指的触摸点
    CGPoint curP = [touch locationInView:self];
    
    // 创建路径
    UIBezierPath *path = [UIBezierPath bezierPath];
    _path = path;
    
    //设置起点
    [path moveToPoint:curP];
}

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    //获取手指的触摸点
    CGPoint curP = [touch locationInView:self];
    
    [_path addLineToPoint:curP];
    
    [self setNeedsDisplay];
}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //给imageView 添加核心动画
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    anim.keyPath = @"position";
    
    anim.path = _path.CGPath;
    
    anim.duration = 1;
    
    anim.repeatCount = MAXFLOAT;
    
    [[[self.subviews firstObject] layer] addAnimation:anim forKey:nil];
}

- (void)drawRect:(CGRect)rect
{
    [_path stroke];
}