Is it ok to cast a NSdictionary object to NSMutableDictionary?
NSDictionary *dict;
NSMutableDictionary *mDict = (NSMutabl开发者_开发百科eDictionary *)dict;
Tried this and it worked fine.
No it is not. If you want a mutable dictionary, make one:
NSMutableDictionary* mutableDict = [dict mutableCopy];
Do not forget in accordance with the rules you own mutableDict and must release it when you are done with it.
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
微信重新建群怎么开发者_Go百科建？ 产品名称：苹果手机 产品型号：iPhone 11 系统版本：iOS 13
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