Core Animation笔记（特殊图层）

1.shapeLayer: 渲染快速，内存占用小，不会被图层边界裁掉（可以在边界之外绘制），不会像素化（当做3D变化如缩放是不会失真）

   CGRect rect = self.containerView.bounds;CAShapeLayer *shaper = [CAShapeLayer new];shaper.backgroundColor = [UIColor yellowColor].CGColor;shaper.lineWidth = 2;shaper.strokeColor = [UIColor redColor].CGColor;//单独设置左上，右上圆角UIRectCorner rcorner = UIRectCornerTopLeft|UIRectCornerTopRight;UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:rcorner cornerRadii:CGSizeMake(30, 30)];//设置路径shaper.path = path.CGPath;
//    [self.containerView.layer addSublayer:shaper];//定义父图层的可见区域(这里使父图层的圆角单独设置左上,右上)self.containerView.layer.mask = shaper;

2.CATextLayer

     CATextLayer *textLayer = [CATextLayer new];textLayer.frame = self.containerView.bounds;[self.containerView.layer addSublayer:textLayer];//设置文本属性textLayer.foregroundColor = [UIColor blueColor].CGColor;textLayer.alignmentMode = kCAAlignmentJustified;textLayer.wrapped = YES;//设置字体UIFont *font = [UIFont systemFontOfSize:14];CFStringRef fontStrRef = (__bridge CFStringRef)font.fontName;CGFontRef fontRef = CGFontCreateWithFontName(fontStrRef);textLayer.font = fontRef;CFRelease(fontRef);textLayer.fontSize = font.pointSize;//设置缩放倍数，防止像素化textLayer.contentsScale = [UIScreen mainScreen].scale;//这里也可以设置富文本字符串NSMutableStringtextLayer.string = @"on my god we you yao bei rangyizhuier le ma ,zhe me zhen shi de ma ,ai ";

3.CATransformLayer: 不平面化子图层，用于构建3D 形状，如下代码用于构建一个正方体

//产生某个面的子layer
- (CALayer*)faceWithTransform:(CATransform3D)transform{CALayer *layer = [CALayer layer];layer.frame = CGRectMake(-50, -50, 100, 100);layer.backgroundColor = [UIColor colorWithRed:rand()/(double)INT_MAX green:rand()/(double)INT_MAX  blue:rand()/(double)INT_MAX alpha:1].CGColor;layer.transform = transform;return layer;
}

- (CALayer*)cubeWithTransform:(CATransform3D)transform{CATransformLayer *cubeLayer = [CATransformLayer layer];//1CATransform3D ct = CATransform3DMakeTranslation(0, 0, 50);[cubeLayer addSublayer:[self faceWithTransform:ct]];//2ct = CATransform3DMakeTranslation(50, 0, 0);ct = CATransform3DRotate(ct, M_PI_2, 0, 1, 0);[cubeLayer addSublayer:[self faceWithTransform:ct]];//3ct = CATransform3DMakeTranslation(0, -50, 0);ct = CATransform3DRotate(ct, -M_PI_2, 1, 0, 0);[cubeLayer addSublayer:[self faceWithTransform:ct]];//4ct = CATransform3DMakeTranslation(0, 50, 0);ct = CATransform3DRotate(ct, -M_PI_2, 1, 0, 0);[cubeLayer addSublayer:[self faceWithTransform:ct]];//5ct = CATransform3DMakeTranslation(-50, 0, 0);ct = CATransform3DRotate(ct, -M_PI_2, 0, 1, 0);[cubeLayer addSublayer:[self faceWithTransform:ct]];//6ct = CATransform3DMakeTranslation(0, 0, -50);ct = CATransform3DRotate(ct, M_PI, 0, 1, 0);[cubeLayer addSublayer:[self faceWithTransform:ct]];cubeLayer.position = CGPointMake(self.containerView.bounds.size.width/2, self.containerView.bounds.size.height/2);//运用3D变换cubeLayer.transform = transform;return cubeLayer;}

- (void)testTransformLayer{CATransform3D tran = CATransform3DIdentity;tran.m34 = -1.0/500;
//添加透视效果self.containerView.layer.sublayerTransform = tran;CATransform3D ct2  = CATransform3DIdentity;ct2 = CATransform3DTranslate(ct2, 100, 0, 0);ct2 = CATransform3DRotate(ct2, -M_PI_4, 1, 0, 0);ct2 = CATransform3DRotate(ct2, -M_PI_4, 0, 1, 0);[self.containerView.layer addSublayer:[self cubeWithTransform:ct2]];}

4.CAGradientLayer:渐变图层

 CAGradientLayer *gradientLayer = [CAGradientLayer layer];gradientLayer.frame = self.containerView.bounds;[self.containerView.layer addSublayer:gradientLayer];gradientLayer.colors = @[(__bridge id)[UIColor redColor].CGColor,(__bridge id)[UIColor yellowColor].CGColor,(__bridge id)[UIColor greenColor].CGColor];gradientLayer.startPoint = CGPointMake(0, 0);gradientLayer.endPoint = CGPointMake(1, 1);//各个渐变点开始渐变的位置，和colors数组个数必须一致.gradientLayer.locations = @[@0.0,@0.1,@0.2]

5.CAReplicatorLayer，生成重复的子图层，并未每个图层应用变换

    CAReplicatorLayer *replayer = [CAReplicatorLayer layer];replayer.frame = self.containerView.bounds;[self.containerView.layer addSublayer:replayer];
//复制个数replayer.instanceCount = 10;CATransform3D transform = CATransform3DIdentity;transform = CATransform3DTranslate(transform, 0, 200, 0);transform = CATransform3DRotate(transform, M_PI/5.0, 0, 0, 1);transform = CATransform3DTranslate(transform, 0, -200, 0);//运用变换replayer.instanceTransform = transform;//改变下一图层的蓝红通道 ,每个复制的图层颜色不一样replayer.instanceBlueOffset = -0.1;replayer.instanceRedOffset = - 0.1;//放一个子图层进去CALayer *layer = [CALayer layer];layer.frame = CGRectMake(100, 100, 100, 100);layer.backgroundColor = [UIColor whiteColor].CGColor;[replayer addSublayer:layer];

产生一个倒影效果(这里自定义一个view用于产生倒影效果)：

自定义view,返回指定的图层
+ (Class)layerClass{return [CAReplicatorLayer class];
}
- (instancetype)init{if (self = [super init]) {[self setUp];}return self;
}
- (instancetype)initWithFrame:(CGRect)frame{if (self = [super initWithFrame:frame]) {[self setUp];}return self;
}
- (void)awakeFromNib{[super awakeFromNib];[self setUp];
}
- (void)setUp{CAReplicatorLayer *layer = (CAReplicatorLayer*)self.layer;layer.instanceCount = 2;CATransform3D transform = CATransform3DIdentity;CGSize size = self.bounds.size;
    transform = CATransform3DTranslate(transform, 0, size.height+2, 0);/**y方向倒转*/transform = CATransform3DScale(transform, 1, -1, 0);layer.instanceTransform = transform;layer.instanceAlphaOffset = -0.6;}

6.CAEmitterLayer:粒子发散效果

 CAEmitterLayer *emmitLayer = [CAEmitterLayer layer];emmitLayer.frame = self.containerView.bounds;[self.containerView.layer addSublayer:emmitLayer];CGSize size = self.containerView.frame.size;emmitLayer.masksToBounds = true;//重叠部分效果，kCAEmitterLayerAdditive，重叠部分更亮emmitLayer.renderMode = kCAEmitterLayerAdditive;//发散点emmitLayer.emitterPosition = CGPointMake(size.width/2, size.height/2);CAEmitterCell *cell =[ CAEmitterCell emitterCell];
//注意图片大小cell.contents = (__bridge id)[UIImage imageNamed:@"spark.jpg"].CGImage;cell.birthRate = 50;//每秒多少个cell.lifetime = 5;cell.color = [UIColor colorWithRed:1 green:0.5 blue:1 alpha:1].CGColor;cell.alphaSpeed = -0.3;cell.velocity = 150;cell.velocityRange = 150;
//发散范围cell.emissionRange = M_PI*2;emmitLayer.emitterCells = @[cell];

7.其他

CAEAGLLayer

CAScrollLayer

CATiledLayer:载入大图

转载于:https://www.cnblogs.com/cnman/p/10702848.html

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