这个功能一般用的不多，但不免碰到有提出这样需求的。
加圆角虚线后
废话不多说，上代码：
CAShapeLayer *borderLayer = [CAShapeLayer layer];
borderLayer.bounds = CGRectMake(0, 0, viewWidth, viewHeight);
borderLayer.position = CGPointMake(CGRectGetMidX(view.bounds), CGRectGetMidY(view.bounds));
borderLayer.path = [UIBezierPath bezierPathWithRoundedRect:borderLayer.bounds cornerRadius:8].CGPath;
borderLayer.lineWidth = 1. / [[UIScreen mainScreen] scale];
borderLayer.lineDashPattern = @[@4, @4];
borderLayer.fillColor = [UIColor clearColor].CGColor;
borderLayer.strokeColor = [UIColor redColor].CGColor;
[view.layer addSublayer:borderLayer];
可以封装一个方法，不用对每一个View都写这段代码
-(void)addDottedBorderWithView:(UIView*)view{
CGFloat viewWidth = view.mj_w;
CGFloat viewHeight = view.mj_h;
view.layer.cornerRadius = 8;
CAShapeLayer *borderLayer = [CAShapeLayer layer];
borderLayer.bounds = CGRectMake(0, 0, viewWidth, viewHeight);
borderLayer.position = CGPointMake(CGRectGetMidX(view.bounds), CGRectGetMidY(view.bounds));
borderLayer.path = [UIBezierPath bezierPathWithRoundedRect:borderLayer.bounds cornerRadius:8].CGPath;
borderLayer.lineWidth = 1. / [[UIScreen mainScreen] scale];
borderLayer.lineDashPattern = @[@4, @4];
borderLayer.fillColor = [UIColor clearColor].CGColor;
borderLayer.strokeColor = [UIColor redColor].CGColor;
[view.layer addSublayer:borderLayer];
}
用到的时候直接把相应的View传过来就行了 。
