iOS直角矩形图片绘制

1、效果如下、本文仅展示黑色直角矩形背景图片绘制方式、文字为Label后来附加

2、使用自定义的UIImageView、绘制 image、通过贝塞尔曲线、四点连线填充颜色完成、

• 从（0,0） ---> (width,0) ---> (width-5,height) ---> (0,height) 四点、
• 连接上path、
• 填充上颜色、
• 获取上下文图片

3、实现代码

@implementation HSRectangeView
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.image = [self getRectWithCorner:frame];
    }
    return self;
}
- (UIImage *)getRectWithCorner:(CGRect)frame {
    UIImage *opaueImage;
    UIGraphicsBeginImageContextWithOptions(frame.size,NO, [UIScreen mainScreen].scale);
    CGContextRef context = UIGraphicsGetCurrentContext();
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(0, 0)];
    [path addLineToPoint:CGPointMake(frame.size.width, 0)];
    [path addLineToPoint:CGPointMake(frame.size.width-5, frame.size.height)];
    [path addLineToPoint:CGPointMake(0, frame.size.height)];
    CGContextAddPath(context, path.CGPath);
    [[UIColor blackColor] setFill];
    CGContextFillPath(context);
    opaueImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return opaueImage;
}
@end

4、调用方式

 UIImageView *backView = [[HSRectangeView alloc]initWithFrame:CGRectMake(0, 10, 80, 20)];
 [headImgView addSubview:backView];