iOS view添加虚线边框

有时候需要为UIView添加虚线描边，本文记录一种实现方式，主要是通过对UIView的根layer添加CAShapeLayer来完成。效果图如下:

UIView虚线边框示意图

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核心代码示例如下:

CGSize screenSize = [UIScreen mainScreen].bounds.size;

CGFloat viewWidth = 200;

CGFloat viewHeight = 200;

UIView *view = [[UIView alloc] initWithFrame:CGRectMake((screenSize.width - viewWidth)/2, (screenSize.height - viewHeight) / 2, viewWidth, viewHeight)];

view.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1];

view.layer.cornerRadius = CGRectGetWidth(view.bounds)/2;

CAShapeLayer *borderLayer = [CAShapeLayer layer];

borderLayer.bounds = CGRectMake(0, 0, viewWidth, viewHeight);

borderLayer.position = CGPointMake(CGRectGetMidX(view.bounds), CGRectGetMidY(view.bounds));

//矩形

//    borderLayer.path = [UIBezierPath bezierPathWithRect:borderLayer.bounds].CGPath;

//圆形,圆角

borderLayer.path = [UIBezierPath bezierPathWithRoundedRect:borderLayer.bounds cornerRadius:CGRectGetWidth(borderLayer.bounds)/2].CGPath;

borderLayer.lineWidth = 1. / [[UIScreen mainScreen] scale];

//虚线边框

borderLayer.lineDashPattern = @[@8, @8];

//实线边框

//    borderLayer.lineDashPattern = nil;

borderLayer.fillColor = [UIColor clearColor].CGColor;

borderLayer.strokeColor = [UIColor redColor].CGColor;

[view.layer addSublayer:borderLayer];

[self.view addSubview:view];

//可通过修改UIBezierPath来改变虚线框的路径。如果想把边框绘制成实线，可将borderLayer.lineDashPattern置为nil即可。

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转自：武一顶顶

链接：https://www.jianshu.com/p/e6b0f6213bb9