CALayer的基本属性

    

    CALayer *superLayer=self.view.layer;

    //创建CALayer

    CALayer *subLayer =[CALayer layer];

    //添加到父图层

    [superLayer addSublayer:subLayer];

    //尺寸

    subLayer.bounds =CGRectMake(0, 0, 200, 200);

    //颜色

    subLayer.backgroundColor =[UIColor greenColor].CGColor;

    //位置

    subLayer.position=CGPointMake(100, 100);

    //锚点

    subLayer.anchorPoint =CGPointMake(0 , 0);

    //圆角

    subLayer.cornerRadius =100;

    //context内容

    UIImage *image =[UIImage imageNamed:@"b"];

    subLayer.contents =(__bridge id)(image.CGImage);

    //超出范围剪裁

    subLayer.masksToBounds =YES;

    //边框颜色

    subLayer.borderColor=[UIColor yellowColor].CGColor;

    //边框大小

    subLayer.borderWidth =5;

    // 阴影

    // 阴影和边界剪裁是不能同时使用的，因为阴影本身就是渲染到边界外面的

    //再从新创建CALyer，这样可以添加阴影

    CALayer *shadowLayer =[CALayer layer];

    shadowLayer.bounds =subLayer.bounds;

    shadowLayer.position =subLayer.position;

    shadowLayer.anchorPoint = CGPointMake(0, 0);

    //圆角

    shadowLayer.cornerRadius =100;

    // CALayer的默认背景色不是白色，而是透明色

    shadowLayer.backgroundColor =[UIColor whiteColor].CGColor;

    //阴影颜色

    shadowLayer.shadowColor =[UIColor grayColor].CGColor;

    //阴影偏移量

    shadowLayer.shadowOffset =CGSizeMake(10, 10);

    //阴影不透明度

    shadowLayer.shadowOpacity =1;

    //添加视图

    [superLayer insertSublayer:shadowLayer below:subLayer];

    //形变

    //位移01

    subLayer.transform =CATransform3DMakeTranslation(-100, 100, 0);

    //位移02

    subLayer.transform =CATransform3DMakeTranslation(100, -100, 0);

    //放大，缩小

    subLayer.transform=CATransform3DMakeScale(.5, .5, .5);

    //旋转  (-1,0,1)  倒着转，不转，正着转;旋转中心以锚点为中心点

    subLayer.transform =CATransform3DMakeRotation(-M_PI_4, -1, 0, 1);

    

    CALayer *transLayer =[CALayer layer];

    transLayer.bounds =CGRectMake(0, 0, 100, 100);

    transLayer.position =CGPointMake(100, 100);

    transLayer.backgroundColor =[UIColor brownColor].CGColor;

    [self.view.layer addSublayer:transLayer];

    //近大远小

    CATransform3D trans =CATransform3DIdentity;

    trans.m34 =-1/800.f;

    subLayer.transform =trans;

    trans =CATransform3DRotate(trans, M_PI_4, 0, -1, -1);

    transLayer.transform =trans;

    CALayer *textLayer =[CALayer layer];

    textLayer.bounds =transLayer.bounds;

    textLayer.position =transLayer.position;

    textLayer.backgroundColor =[UIColor blueColor].CGColor;

    [self.view.layer insertSublayer:textLayer below:transLayer];