UIView的阴影设置主要通过UIView的layer的相关属性来设置
阴影的颜色
imgView.layer.shadowColor = [UIColor blackColor].CGColor;阴影的透明度
imgView.layer.shadowOpacity = 0.8f;阴影的圆角
imgView.layer.shadowRadius = 4.f;阴影偏移量
imgView.layer.shadowOffset = CGSizeMake(4,4);
imgView.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阴影。
阴影的路径
除了通过上面的操作，我们还可以设定阴影的路径
//路径阴影
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;
总结
以上就是这篇文章的全部内容，希望能对各位iOS开发者们能有所帮助，如果有疑问大家可以留言交流。
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