iOS UILabel单边圆角+边框

//单边圆角
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.stateLabel.bounds byRoundingCorners:UIRectCornerBottomLeft cornerRadii:CGSizeMake(5, 5)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.stateLabel.bounds;
maskLayer.path = maskPath.CGPath;
self.stateLabel.layer.mask  = maskLayer;

其中RoundingCorners中决定要圆角的边，如要多个边则（UIRectCornerBottomLeft | UIRectCornerBottomRight）就可以。

如果要加边框可以通过改变CAShapeLayer的line来实现

resetLayer.lineWidth=1;
resetLayer.strokeColor=[UIColor lightGrayColor].CGColor;
resetLayer.fillColor=[UIColor whiteColor].CGColor;

[resetButton.layer addSublayer:resetLayer];