如何防止 NSMutableArray 爲 nil ,致使數據沒法寫入

Demo NSMutableArray *dataArray = [[NSMutableArray alloc] init]; [dataArray addObject:@"123"]; NSLog(@"1--%@",dataArray);//打印數組 NSLog(@"1----%p",dataArray);//打印數組內存地址 dataArray = nil; [dataArray addOb

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