删除开始的'-'线
NSRange range = [intro rangeOfString:@"-"];
[intro deleteCharactersInRange:range];
删除结尾的'-'线
NSString *introduction = [intro substringToIndex:[intro length]-1];
NSString字符串操作技巧之删除
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转载自lizhuang.iteye.com/blog/1987626
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