iOS7 中 boundingRectWithSize:options:attributes:context:计算文本尺寸的使用

CGSize constraintSize;

        constraintSize.width = MAXFLOAT;

        constraintSize.height = 32;

        //CGSize sizeFrame =[content.text sizeWithFont:WBLText16Font constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];

        //旧的

 

//新的

        

        

        NSDictionary *attribute = @{NSFontAttributeName: WBLText16Font};

        

        CGSize sizeFrame = [content.text boundingRectWithSize:CGSizeMake(MAXFLOAT, 0) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil].size;