iOS的CoreAnimation框架下有一些特殊的layer,使用它们往往会做出非常炫丽的动画效果,不需要使用图片,不需要帧动画。下面我们就来看看三种常见的layer动画,分别是CAReplicatorLayer、CAEmitterLayer和CAGradientLayer。
一、复制层动画 CAReplicatorLayer
CAReplicatorLayer可以复制自己子层的layer,并且复制的出来的layer和原来的子layer拥有相同的动效。然后通过设置一些属性,就可以完成很酷的效果,非常强大。。
##效果1:
##实现:
1.首先我们要得到一个love路径,这个路径用UIBezierPath来制作;
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+ (CGPathRef)heartPath { CGFloat W = 25; CGFloat marginX = 10; CGFloat marginY = 15/25.0 * W; CGFloat space = 5/25.0 * W; UIBezierPath *bezierPath = [UIBezierPath new]; [bezierPath moveToPoint:(CGPointMake(marginX + W * 2, W * 4 + space))]; [bezierPath addQuadCurveToPoint:CGPointMake(marginX, W * 2) controlPoint:CGPointMake(W, W * 4 - space)]; [bezierPath addCurveToPoint:CGPointMake(marginX + W * 2, W * 2) controlPoint1:CGPointMake(marginX, marginY) controlPoint2:CGPointMake(marginX + W * 2, marginY)]; [bezierPath addCurveToPoint:CGPointMake(marginX + W * 4, W * 2) controlPoint1:CGPointMake(marginX + W * 2, marginY) controlPoint2:CGPointMake(marginX + W * 4, marginY)]; [bezierPath addQuadCurveToPoint:CGPointMake(marginX + W * 2, W * 4 + space) controlPoint:CGPointMake(marginX * 2 + W * 3, W * 4 - space)]; [bezierPath closePath]; CGAffineTransform T = CGAffineTransformMakeScale(3.0, 3.0); return CGPathCreateCopyByTransformingPath(bezierPath.CGPath, &T); } |
2.创建CAReplicatorLayer,添加上CAKeyframeAnimation动效;
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+ (CALayer *)replicatorLayer_Heart{ CAReplicatorLayer *replicatorLayer = [CAReplicatorLayer new]; replicatorLayer.frame = CGRectMake(0, 0, 200, 200); // replicatorLayer.backgroundColor = [UIColor colorWithWhite:0 alpha:0.75].CGColor; CALayer *subLayer = [CALayer new]; subLayer.bounds = CGRectMake(60, 105, 10, 10); subLayer.backgroundColor = [UIColor colorWithWhite:0.8 alpha:1.0].CGColor; subLayer.borderColor = [UIColor colorWithWhite:1.0 alpha:1.0].CGColor; subLayer.borderWidth = 1.0; subLayer.cornerRadius = 5.0; subLayer.shouldRasterize = YES; subLayer.rasterizationScale = [UIScreen mainScreen].scale; [replicatorLayer addSublayer:subLayer]; CAKeyframeAnimation *move = [CAKeyframeAnimation animationWithKeyPath:@"position"]; move.path = [self heartPath]; move.repeatCount = INFINITY; move.duration = 6.0; // move.autoreverses = YES; [subLayer addAnimation:move forKey:nil]; replicatorLayer.instanceDelay = 6/50.0; replicatorLayer.instanceCount = 50; replicatorLayer.instanceColor = [UIColor orangeColor].CGColor; replicatorLayer.instanceGreenOffset = -0.03; return replicatorLayer; } |
3.创建一个UIView,将CAReplicatorLayer添加上去。
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- (void)setReplicatorLayerType:(YUReplicatorLayerType)replicatorLayerType { CGFloat width = 100; UIView *aniView = [[UIView alloc] initWithFrame:CGRectMake(0, 150, width, width)]; [self.view addSubview:aniView]; [aniView.layer addSublayer: [YUReplicatorAnimation replicatorLayerWithType:replicatorLayerType]]; self.view.backgroundColor = [UIColor grayColor]; } |
##CAReplicatorLayer动画效果合集:
##实现:点击下载demo源代码
二、粒子动画 CAEmitterLayer
CAEmitterLayer 是一个高性能的粒子引擎,被用来创建复杂的粒子动画如:烟雾,火,雨等效果,并且很好地控制了性能。
CAEmitterLayer 看上去像是许多 CAEmitterCell 的容器,这些 CAEmitterCell 定义了一个例子效果。你将会为不同的例子效果定义一个或多个 CAEmitterCell 作为模版,同时 CAEmitterLayer 负责基于这些模版实例化一个粒子流。一个 CAEmitterCell 类似于一个 CALayer :它有一个 contents 属性可以定义为一个 CGImage ,另外还有一些可设置属性控制着表现和行为。
##下雪效果:
三、渐变层 CAGradientLayer
使用CAGradientLayer可以实现色差动画效果。
##效果:
##主要实现代码:
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- (void)showLoadingInView:(UIView *)view text:(NSString *)text { [view addSubview:self]; if (text) { self.text = text; } [self sizeToFit]; // 创建渐变效果的layer CAGradientLayer *graLayer = [CAGradientLayer layer]; graLayer.frame = self.bounds; graLayer.colors = @[(__bridge id)[[UIColor greenColor] colorWithAlphaComponent:0.3].CGColor, (__bridge id)[UIColor yellowColor].CGColor, (__bridge id)[[UIColor yellowColor] colorWithAlphaComponent:0.3].CGColor]; graLayer.startPoint = CGPointMake(0, 0);//设置渐变方向起点 graLayer.endPoint = CGPointMake(1, 0); //设置渐变方向终点 graLayer.locations = @[@(0.0), @(0.0), @(0.1)]; //colors中各颜色对应的初始渐变点 // 创建动画 CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"locations"]; animation.duration = 1.0f; animation.toValue = @[@(0.9), @(1.0), @(1.0)]; animation.removedOnCompletion = NO; animation.repeatCount = HUGE_VALF; animation.fillMode = kCAFillModeForwards; [graLayer addAnimation:animation forKey:@"xindong"]; // 将graLayer设置成textLabel的遮罩 self.layer.mask = graLayer; } |
demo下载
点击下载demo源代码
总结
iOS的动画非常强大,还有很多很多有待我去学习。另外,写的很不好的地方,希望各位大神能够指正,我会尽量去修改,谢谢。
原文:大专栏 几种特殊的layer动画
原文地址:https://www.cnblogs.com/wangziqiang123/p/11618214.html