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2014/03/13
[Objective-C] 這裡什麼都沒有!!! - nil / Nil / NULL
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等等，這個變數容器已經不在存放著iPad了，但要怎麼從變數容器中移除呢?
我是nil，
你也可以叫我Nil或是NULL，
我代表"什麼都沒有"，
只要你將我放在變數容器中就可以清除iPad於存在了。
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