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澄清我有以下代碼(這兩個項目和itemsCopy是NSMutableArray的公司):需要對addObjectsFromArray功能
//DO: populate items w/ 30 elements
[self.itemsCopy addObjectsFromArray:self.items];
//DO: remove all elements in items
結果
Begin Pass 1:
itemsCopy = 0
items = 30
End Pass 1:
itemsCopy = 30
items = 0
Begin Pass 2:
itemsCopy = 0
items = 30
End Pass 2:
itemsCopy = 30
items = 0
我怎樣才能不斷追加項目itemsCopy的結束?我想場景是這樣的:
Begin Pass 1:
itemsCopy = 0
items = 30
End Pass 1:
itemsCopy = 30;
items = 0;
Begin Pass 2:
itemsCopy = 30
items = 30
End Pass 2:
itemsCopy = 60
items = 0
某處您必須重新初始化itemsCopy數組,或者每次執行不同對象上的操作時都需要重新初始化.... – ennuikiller 2010-07-01 00:33:07
so addObjectsFromArray should always append? – 2010-07-01 01:43:26
希漢阿拉姆:是的。請參閱文檔:http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/Reference/Reference.html#//apple_ref/occ/instm/NSMutableArray/addObjectsFromArray:無處它說它會重置陣列,也沒有任何理由。 – 2010-07-01 12:05:24