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UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:CGRectMake(0, 200, 320, 20)]; [self.view addSubview:imageView1]; UIGraphicsBeginImageContext(imageView1.frame.size); //开始画线 [imageView1.image drawInRect:CGRectMake(0, 0, imageView1.frame.size.width, imageView1.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); //设置线条终点形状 const CGFloat lengths[] = {5,3}; CGContextRef line = UIGraphicsGetCurrentContext(); CGContextSetStrokeColorWithColor(line, [UIColor redColor].CGColor); CGContextSetLineDash(line, 0, lengths, 2); //画虚线 CGContextMoveToPoint(line, 0.0, 20.0); //开始画线 CGContextAddLineToPoint(line, 310.0, 20.0); CGContextStrokePath(line); imageView1.image = UIGraphicsGetImageFromCurrentImageContext();