摘要：
一开始用UILineBreakModeWordWrap时，发现中英文混合，用sizeWithFont高度不是很精确；后来改为UILineBreakModeCharacterWrap就OK了；下面是UILineBreakMode的说明：typedef enum { UILineBreakModeWordWrap = 0, UILineBreakModeCharacterWrap, UILineBreakModeClip, UILineBreakModeHeadTruncation, UILineBreakModeTailTruncation, UILineBreakModeMiddleTrunc 阅读全文
