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//中文转成utf8
NSString *utf8 = [@"今晚打老虎"
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//utf8转成中文
NSString *zhongwen = [utf8 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"utf8->%@",utf8);
NSLog(@"zhongwen->%@",zhongwen);
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原文地址:http://www.cnblogs.com/dopa-chenyy/p/5404447.html