NSString 计算尺寸

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NSDictionary *attribute =@{NSFontAttributeName: [UIFontsystemFontOfSize:15]};

CGSize size = [@"tabbar_shaixuan"boundingRectWithSize:CGSizeMake(100,0)options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeadingattributes:attributecontext:nil].size;


自定义cell高度:http://www.cocoachina.com/applenews/devnews/2014/0604/8668.html

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