这是给self.view画一个类似self.layer.border的边框, 是虚线~
在网上找的例子
CAShapeLayer *border = [CAShapeLayer layer];
border.strokeColor = SLColorLine.CGColor;
border.fillColor = nil;
border.path = [UIBezierPath bezierPathWithRect:self.bounds].CGPath;
border.frame = self.bounds;
border.lineWidth = 1.f;
border.lineCap = @"square";
border.lineDashPattern = @[@4, @2];
[self.layer addSublayer:border];
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