UIView 设置阴影(属性说明)

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以下代码实现：

第一个图片的代码

//加阴影--任海丽编辑

    _imageView.layer.shadowColor = [UIColor blackColor].CGColor;//shadowColor阴影颜色

    _imageView.layer.shadowOffset = CGSizeMake(,);//shadowOffset阴影偏移,x向右偏移4，y向下偏移4，默认(0, -3),这个跟shadowRadius配合使用

    _imageView.layer.shadowOpacity = 0.8;//阴影透明度，默认0

    _imageView.layer.shadowRadius = ;//阴影半径，默认3

第二个图片的代码

    _imageView1.layer.shadowColor = [UIColor yellowColor].CGColor;//shadowColor阴影颜色

    _imageView1.layer.shadowOffset = CGSizeMake(,);//shadowOffset阴影偏移，默认(0, -3),这个跟shadowRadius配合使用

    _imageView1.layer.shadowOpacity = ;//阴影透明度，默认0

    _imageView1.layer.shadowRadius = ;//阴影半径，默认3

    //路径阴影

    UIBezierPath *path = [UIBezierPath bezierPath];

    float width = _imageView1.bounds.size.width;

    float height = _imageView1.bounds.size.height;

    float x = _imageView1.bounds.origin.x;

    float y = _imageView1.bounds.origin.y;

    float addWH = ;

    CGPoint topLeft      = _imageView1.bounds.origin;

    CGPoint topMiddle = CGPointMake(x+(width/),y-addWH);

    CGPoint topRight     = CGPointMake(x+width,y);

    CGPoint rightMiddle = CGPointMake(x+width+addWH,y+(height/));

    CGPoint bottomRight  = CGPointMake(x+width,y+height);

    CGPoint bottomMiddle = CGPointMake(x+(width/),y+height+addWH);

    CGPoint bottomLeft   = CGPointMake(x,y+height);

    CGPoint leftMiddle = CGPointMake(x-addWH,y+(height/));

    [path moveToPoint:topLeft];

    //添加四个二元曲线

    [path addQuadCurveToPoint:topRight

                 controlPoint:topMiddle];

    [path addQuadCurveToPoint:bottomRight

                 controlPoint:rightMiddle];

    [path addQuadCurveToPoint:bottomLeft

                 controlPoint:bottomMiddle];

    [path addQuadCurveToPoint:topLeft

                 controlPoint:leftMiddle];

    //设置阴影路径

     _imageView1.layer.shadowPath = path.CGPath;