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澄清我有以下代码(这两个项目和itemsCopy是NSMutableArray的公司):需要对addObjectsFromArray功能
//DO: populate items w/ 30 elements
[self.itemsCopy addObjectsFromArray:self.items];
//DO: remove all elements in items
结果
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
我怎样才能不断追加项目itemsCopy的结束?我想场景是这样的:
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
某处您必须重新初始化itemsCopy数组,或者每次执行不同对象上的操作时都需要重新初始化.... – ennuikiller 2010-07-01 00:33:07
so addObjectsFromArray should always append? – 2010-07-01 01:43:26
希汉阿拉姆:是的。请参阅文档:http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/Reference/Reference.html#//apple_ref/occ/instm/NSMutableArray/addObjectsFromArray:无处它说它会重置阵列,也没有任何理由。 – 2010-07-01 12:05:24