UIView设置阴影效果

UIView的阴影效果主要是通过UIView的layer的相关属性来设置

阴影的颜色

shadowView.layer.shadowColor = [UIColor blackColor].CGColor;

阴影的透明度

shadowView.layer.shadowOpacity = 0.8f;

阴影的圆角

shadowView.layer.shadowRadius = 4.0f;

阴影的偏移量

shadowView.layer.shadowOffset = CGSizeMake(4,4);

shadowView.layer.shadowOffset = CGSizeMake(0,0);

其实从偏移量上可以看出来,即使偏移量为(0,0)时,围绕view的四周依然能看到一定的阴影效果.

也可以通过设置路径来设置阴影效果:

阴影路径

UIBezierPath *path = [UIBezierPath bezierPath];

[path moveToPoint:CGPointMake(-5, -5)];

//添加直线
[path addLineToPoint:CGPointMake(paintingWidth /2, -15)];
[path addLineToPoint:CGPointMake(paintingWidth +5, -5)];
[path addLineToPoint:CGPointMake(paintingWidth +15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(paintingWidth +5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(paintingWidth /2, paintingHeight +15)];
[path addLineToPoint:CGPointMake(-5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(-15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(-5, -5)];
//设置阴影路径
imgView.layer.shadowPath = path.CGPath;