CALayer,,,CATextLayer,,,CAShapeLayer,, CAGradientLayer

CALayer     

    //获得根图层

    CALayer *layer = [[CALayer alloc]init]; (CATextLayer 可以填加文字)

   

    layer.backgroundColor = [UIColor blueColor].CGColor;

    layer.position = CGPointMake(ScreenWidth/2.0, ScreenHeight/2.0);

    layer.bounds = CGRectMake(0, 0, 40, 40);

    layer.cornerRadius = 40/2.0;

    layer.shadowColor=[UIColor grayColor].CGColor;

    layer.shadowOffset=CGSizeMake(2, 2);

    layer.shadowOpacity=0.9;

   layer.contents = (__bridge id)image.CGImage; //添加图片

    layer.contentsGravity = kCAGravityResizeAspect; //图片的展示方式

    

    [self.view.layer addSublayer:layer];

 

     //获取到Layer

     CALayer *layer = self.view.layer.sublayers.firstObject;

 

CATextLayer

  

    CATextLayer *lary = [CATextLayer layer];

    lary.string = @"dasfasa";

    lary.bounds = CGRectMake(0, 0, 320, 20);

    lary.font = CFBridgingRetain(@"HiraKakuProN-W3");//字体的名字 不是 UIFont

    lary.fontSize = 12.f;//字体的大小

    lary.wrapped = YES;//默认为No.  当Yes时，字符串自动适应layer的bounds大小

    lary.alignmentMode = kCAAlignmentCenter;//字体的对齐方式

    lary.position = CGPointMake(160, 410);//layer在view的位置 适用于跟随摸一个不固定长的的控件后面需要的

    lary.contentsScale = [UIScreen mainScreen].scale;//解决文字模糊 以Retina方式来渲染，防止画出来的文本像素化

    lary.foregroundColor =[UIColor redColor].CGColor;//字体的颜色 文本颜色

    [self.view.layer addSublayer:lary];

 

CAShapeLayer (对UIView进行不规则裁切, 与UIBezierPath相结合使用,)

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 64, 100, 100)];

 

//    UIBezierPath *path = [UIBezierPath bezierPath];

//    [path moveToPoint:point1];

//    [path addLineToPoint:point2];

//    [path addLineToPoint:point3];

//    [path closePath];

//    view.layer.mask = layer;  //对View进行不规则裁切

 

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    shapeLayer.frame = CGRectMake(0, 0, 100, 100);

    shapeLayer.strokeEnd = 0.7f;

    shapeLayer.strokeStart = 0.1f;

    shapeLayer.path = path.CGPath;

    shapeLayer.fillColor = [UIColor clearColor].CGColor;

    shapeLayer.lineWidth = 2.0f;

    shapeLayer.strokeColor = [UIColor blueColor].CGColor;

   

    [self.view.layer addSublayer:shapeLayer];

 

CAGradientLayer 渐变

 

    CAGradientLayer *gradientLayer = [CAGradientLayer layer];

    gradientLayer.frame = self.view.bounds;

    [self.view.layer addSublayer:gradientLayer];

   

    gradientLayer.colors = @[(__bridge id)[UIColor clearColor].CGColor, (__bridge id)[UIColor whiteColor].CGColor];

   

    gradientLayer.startPoint = CGPointMake(0, 0);

    gradientLayer.endPoint = CGPointMake(0, 1);