iOS uislider滑轨宽度调宽和滑轨调宽后滑不到最右边出现

//// 改变滑条的宽度

- (CGRect)trackRectForBounds:(CGRect)bounds {

    returnbounds;

}

//改变宽度后，滑到右边会出现直角的多余的情况，以下宽度加20就是完整覆盖

- (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value{

 rect.origin.x= rect.origin.x-10;

 rect.size.width= rect.size.width+20;

 return CGRectInset([super thumbRectForBounds:bounds trackRect:rect value:value],10,10);

}