参考:https://stackoverflow.com/questions/3898974/stringwithformat-vs-initwithformat-on-nsstring
简要来说就是initWithFormat创建的string对象需要手动释放
stringWithFormat这个会自动释放
参考:https://stackoverflow.com/questions/3898974/stringwithformat-vs-initwithformat-on-nsstring
简要来说就是initWithFormat创建的string对象需要手动释放
stringWithFormat这个会自动释放
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