画线 ios

最新推荐文章于 2021-01-12 09:31:59 发布

原创最新推荐文章于 2021-01-12 09:31:59 发布 · 331 阅读

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本文介绍如何使用Objective-C在iOS应用中实现自定义虚线的绘制过程。通过设置上下文、线条属性及颜色，利用Core Graphics框架完成指定路径上的虚线绘制，并展示了具体的实现代码。

//

float h=0;
UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:CGRectMake(0,0, SCREEN_WIDTH,h)];
[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
//间隔
CGFloat lengths[] = {4,4};
CGContextRef line = UIGraphicsGetCurrentContext();
//颜色
CGContextSetStrokeColorWithColor(line, RGBA(15, 41, 74, 1).CGColor);

CGContextSetLineDash(line, 0, lengths, 2);  //画虚线

CGContextMoveToPoint(line, 0.0, h);    //开始画横线
CGContextAddLineToPoint(line, SCREEN_WIDTH, h);

// CGContextMoveToPoint(line, SCREEN_WIDTH/2,0); //开始画竖线
// CGContextAddLineToPoint(line, SCREEN_WIDTH/2, h);
CGContextStrokePath(line);
//加载popView;
imageView1.image = UIGraphicsGetImageFromCurrentImageContext();