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CGSize size = [xxx sizeWithAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14.0f]}]; CGSize adjustedSize = CGSizeMake(ceilf(size.width), ceilf(size.height));
iOS 根据字体设置size
原文地址：http://www.cnblogs.com/tongyuling/p/4834796.html
