iOS之CAReplicatorLayer属性简介和使用

1、CAReplicatorLayer简介

　　CAReplicatorLayer用于对图层进行复制，包括图层的动画也能复制！可以看着将某一段事务进行重复！

#import <QuartzCore/CALayer.h>

NS_ASSUME_NONNULL_BEGIN
CA_CLASS_AVAILABLE (10.6, 3.0, 9.0, 2.0)
@interface CAReplicatorLayer : CALayer

//指定图层重复制多少次
@property NSInteger instanceCount;

//设置为YES,图层将保持于CATransformLayer类似的性质和相同的限制
@property BOOL preservesDepth;

//复制延时，一般用在动画上
@property CFTimeInterval instanceDelay;

//3D变换
@property CATransform3D instanceTransform;

//设置多个复制图层的颜色,默认位白色
@property(nullable) CGColorRef instanceColor;

//设置每个复制图层相对上一个复制图层的红色、绿色、蓝色、透明度偏移量
@property float instanceRedOffset;
@property float instanceGreenOffset;
@property float instanceBlueOffset;
@property float instanceAlphaOffset;

@end

NS_ASSUME_NONNULL_END

2、CAReplicatorLayer的简单使用

- (void)cirAction{
    CAShapeLayer *sharLayer = [CAShapeLayer layer];
    sharLayer.backgroundColor = [UIColor redColor].CGColor;
    sharLayer.bounds = CGRectMake(0, 0, 20, 20);
    sharLayer.position = CGPointMake(CScreenWidth/2, 150);
    sharLayer.cornerRadius = 10;
    
    CABasicAnimation *ani = [CABasicAnimation animationWithKeyPath:@"transform"];
    ani.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(10, 10, 1)];
    ani.duration = 2;
    
    CABasicAnimation *ani1 = [CABasicAnimation animationWithKeyPath:@"opacity"];
    ani1.fromValue = @1;
    ani1.toValue = @0;
    ani1.duration = 2;
    
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.animations = @[ani,ani1];
    group.duration = 2;
    group.repeatCount = HUGE;
    [sharLayer addAnimation:group forKey:nil];
    
    CAReplicatorLayer *replayer  =[CAReplicatorLayer layer];
    [replayer addSublayer:sharLayer];
    replayer.instanceCount = 3;
    replayer.instanceDelay = 0.5;
    [self.showView.layer addSublayer:replayer];
}

效果图

- (void)alphaAction{
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.backgroundColor = [UIColor redColor].CGColor;
    shapeLayer.bounds = CGRectMake(0, 0, 50, 50);
    shapeLayer.position = CGPointMake(CScreenWidth/2, 50);
    shapeLayer.borderColor = [UIColor whiteColor].CGColor;
    shapeLayer.cornerRadius = 25;
    shapeLayer.borderWidth = 1;
    shapeLayer.transform = CATransform3DMakeScale(.0, .0, .0);


    CABasicAnimation *ani = [CABasicAnimation animationWithKeyPath:@"transform"];
    ani.duration = 2;
    ani.repeatCount = HUGE;
    ani.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(1, 1, 1)];
    ani.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(.1, .1, .1)];
    [shapeLayer addAnimation:ani forKey:nil];

    CAReplicatorLayer *repLayer = [CAReplicatorLayer layer];
    repLayer.frame = CGRectMake(0, 0, CScreenWidth, 300);

    [repLayer addSublayer:shapeLayer];
    repLayer.instanceCount = 20;
    repLayer.instanceDelay = .1;
    repLayer.instanceTransform = CATransform3DMakeRotation(M_PI/10, 0, 0, 1);
    repLayer.instanceAlphaOffset = -0.05;
    [self.showView.layer addSublayer:repLayer];

}

效果图