按钮左上角及左下角圆角:
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.signBtn.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerTopLeft cornerRadii:CGSizeMake(11, 11)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.signBtn.bounds;
maskLayer.path = maskPath.CGPath;
self.signBtn.layer.mask = maskLayer;
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