-(void)drawRect:(CGRect)rect{    CGContextRef cont = UIGraphicsGetCurrentContext();    CGContextSetStrokeColorWithColor(cont, RGB(238, 234, 252).CGColor);    CGContextSetLineWidth(cont, 1);    CGFloat lengths[] = {
   8,5};    CGContextSetLineDash(cont, 0, lengths, 2);  //画虚线    CGContextBeginPath(cont);    CGContextMoveToPoint(cont, 10*RatioWidth, rect.size.height - 1);    //开始画线    CGContextAddLineToPoint(cont, rect.size.width-10*RatioWidth, rect.size.height - 1);    CGContextStrokePath(cont);}