如何在iOS中更改条纹进度条的框架？

Question

我想获得进度条，如下图所示：

Striped loading progress bar with triangle at the end

在github https://github.com/iluuu1994/ITProgressBar-iOS项目的帮助下，到目前为止我已经完成了这项工作，所以这就是我的尝试：

     UIGraphicsBeginImageContextWithOptions(CGSizeMake(42, self.frame.size.height-10), NO, 0.f);
        UIColor* color = [UIColor colorWithRed:251.0f/255.0f green:235.0f/255.0f blue:77.0f/255.0f alpha:1.0f];

        UIBezierPath *bezierPath = [UIBezierPath new];
        [bezierPath moveToPoint:CGPointMake(0.0, 0.0)];
        [bezierPath addLineToPoint:CGPointMake(23, 0)];
        [bezierPath addLineToPoint:CGPointMake(42, 29)];
        [bezierPath addLineToPoint:CGPointMake(23, 70)];
        [bezierPath addLineToPoint:CGPointMake(0, 70)];
        [bezierPath addLineToPoint:CGPointMake(20, 29)];
        [bezierPath addLineToPoint:CGPointMake(0, 0)];
        [bezierPath closePath];
        [color setFill];
        [bezierPath fill];

    }];
}

我试图从UIView覆盖drawRect方法，但似乎没有任何效果，所以我努力将掩码应用到我正在使用的图层。