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// 内部图片的frame
- (CGRect)imageRectForContentRect:(CGRect)contentRect
{
    CGFloat imageW = contentRect.size.width;
    CGFloat imageH = contentRect.size.height * IWTabBarButtonImageRatio;
    return CGRectMake(0, 0, imageW, imageH);
}

// 内部文字的frame
- (CGRect)titleRectForContentRect:(CGRect)contentRect
{
    CGFloat titleY = contentRect.size.height * IWTabBarButtonImageRatio;
    CGFloat titleW = contentRect.size.width;
    CGFloat titleH = contentRect.size.height - titleY;
    return CGRectMake(0, titleY, titleW, titleH);
}