CABasicAnimation来做心跳动画

CABasicAnimation *anim = [CABasicAnimation animation];
    
    anim.keyPath = @"transform.scale";
    anim.toValue = @0.5;
    anim.repeatCount = MAXFLOAT;
    
    [_heartImageV.layer addAnimation:anim forKey:nil];//_heartImageV 上放一张🧡形图片
 

 

简单讲就是利用核心动画，设置核心动画对象的keyPath为tramsform.scale，然后将这个核心动画对象添加到图层上。

百度了一下，keyPath值还挺多的：

animationWithKeyPath的值：

　 transform.scale = 比例轉換

    transform.scale.x = 闊的比例轉換

    transform.scale.y = 高的比例轉換

    transform.rotation.z = 平面圖的旋轉

    opacity = 透明度

    margin

    zPosition

    backgroundColor    背景颜色

    cornerRadius    圆角

    borderWidth

    bounds

    contents

    contentsRect

    cornerRadius

    frame

    hidden

    mask

    masksToBounds

    opacity

    position

    shadowColor

    shadowOffset

    shadowOpacity

    shadowRadius

可以分为三类吧：

1. 缩放 keypath 用bounds 或者 transform 或者 　transform.scale

方案一：

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"bounds"];

anim.duration = 2;

anim.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, 30, 30)];

[_myView.layer addAnimation:anim forKey:nil];
 

方案二：（还是一比较简单）

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
anim.duration = 1.5; // 动画持续1.5s

// CALayer的宽度从0.5倍变为2倍
// CALayer的高度从0.5倍变为1.5倍
anim.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.5, 0.5, 1)];
anim.toValue  = [NSValue valueWithCATransform3D:CATransform3DMakeScale(2, 1.5, 1)];

[_myView.layer addAnimation:anim forKey:nil];
 

方案三:（还是一比较简单）
CABasicAnimation *anim = [CABasicAnimation animation]; // 告诉系统修改图层的哪个属性  anim.keyPath = @"transform.scale"; // 告诉系统修改图层的哪个值 // anim.toValue = [NSValue valueWithCGPoint:CGPointMake(300, 300)]; anim.toValue = @0.5; // 取消反弹 // 告诉在动画结束的时候不要移除 anim.removedOnCompletion = NO; // 始终保持最新的效果 anim.fillMode = kCAFillModeForwards; [_redView.layer addAnimation:anim forKey:nil];
 

2.平移  keypath 用position 或transform

CABasicAnimation *anim = [CABasicAnimation animation];
    
    anim.keyPath = @"position";
    
    anim.toValue = [NSValue valueWithCGPoint:CGPointMake(250, 500)];
    
    // 必须设置代理
    anim.delegate = self;
    
    // 取消反弹
    anim.removedOnCompletion = NO;
    anim.fillMode = kCAFillModeForwards;
    
    [_redView.layer addAnimation:anim forKey:nil];
 

3.旋转  keypath 用 transform

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
anim.duration = 1.5;

// 绕着(0, 0, 1)这个向量轴 Z 轴，顺时针旋转45°(M_PI_4)
anim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_4, 0, 0, 1)];

[_redView.layer addAnimation:anim forKey:nil];