iOS设置可选择圆角方向的控件圆角

self.view.layer.cornerRadius =10.f;//如果设置圆角角度为半圆，则数值为控件高度的一半

self.view.layer.masksToBounds = YES;//是否删除多余的位置

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:btn.bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(10, 10)];

//rect为控件的frame corners为圆角的位置 cornerRadii为圆角的大小

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

maskLayer.frame =frame;

maskLayer.path = maskPath.CGPath;

btn.layer.mask = maskLayer;