添加阴影和设置圆角
圆角:

CALayer * layer = [theView layer];[layer setShadowOffset:theOffset];[layer setShadowRadius:theRadius];[layer setShadowOpacity:theOpacity];[layer setShadowColor:theColor.CGColor];

其中:theView(UIView)为目标view
theOffset(CGSize)为阴影偏移量,默认为(0, -3)
theRadius(float)为阴影四角圆角半径,默认值为3
theOpacity(float)为阴影透明度(取值为[0,1])
theColor(UIColor)为阴影颜色