ios異步中實現按序下載隊列

HFSingleonH 頭件這裏寫連接內容web #define HFSingletonH(name) + (instancetype)shared##name; // .m文件 #if __has_feature(objc_arc) #define HFSingletonM(name) \ static id _instace; \ \ + (id)allocWithZone:(struct

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