IOS开发复制的总结(深拷贝浅拷贝区别)

 1.复制可变字符串 NSMutableString * city = [NSMutableString stringWithString:@"北京"]; //复制可变副本 NSMutableString * cityCopy = [city mutableCopy]; //修改副本 [cityCopy replaceCharacte

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