CGFloat viewWidth = 150;
CGFloat viewHeight = 150;
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, viewWidth, viewHeight)];
view.backgroundColor = [UIColor colorWithWhite:0.7 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));
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。
