iOS 虚线实现

//设置图片
self.DottedLine.image = [self imageWithLineWithImageView:self.DottedLine];

//画虚线方法
-(UIImage *)imageWithLineWithImageView:(UIImageView *)imageView{
    CGFloat width = imageView.frame.size.width;
    CGFloat height = imageView.frame.size.height;
    UIGraphicsBeginImageContext(imageView.frame.size);
    [imageView.image drawInRect:CGRectMake(0, 0, width, height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGFloat lengths[] = {5,5};//虚线的长度设置
    CGContextRef line = UIGraphicsGetCurrentContext();
    CGContextSetStrokeColorWithColor(line, [UIColor colorWithRed:133/255.0 green:133/255.0 blue:133/255.0 alpha:1.0].CGColor);
//画线
    CGContextSetLineDash(line, 0, lengths, 1);
    CGContextMoveToPoint(line, 0, 1);
    CGContextAddLineToPoint(line, width-5, 1);
    CGContextStrokePath(line);
    return  UIGraphicsGetImageFromCurrentImageContext();
}

效果图

68B0C875-4E58-43E0-99E6-530CA9D16220.png

Alert:
只是测试了这一种方法,还有其他的方法,回头测试了再贴出来