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Swift2中PFObject的fetchAllIfNeededInBackground(帶塊)的語法是什麼。解析的Swift 2語法fetchAllIfNeededInBackground
Objective-C的簽名是:
+ (void)fetchAllIfNeededInBackground:(nullable NSArray<PFObject *> *)objects block:(nullable PFArrayResultBlock)block;
有人能寫一個簡單的例子,在斯威夫特2編譯?