iOS - 存儲對變量內的對象的引用

Question

我將如何去引用變量內的UILabel？

例如;

NSObject *instance; 
switch (option) { 
    case 0: 
    { 
     NSObject *instance = self.player1; 
    } 
    case 1: 
    { 
     NSObject *instance = self.player2; 
    } 
} 
instance.text = @"Hello" 

然後我想更改NSObject中標籤的文本，但看起來不起作用。 那麼我該如何去做這件事？順便說一下，如果你不能說，我是新來的Objective C。

Answer 1

NSObject *instance; 
switch (option) { 
    case 0: 
     instance = self.player1; // Don't redeclare the variable, just set it. 
     break; // If we don't do this, we'll continue on to the next line! 

    case 1: 
     instance = self.player2; 
     break; 

    default: 
     // If option isn't 0 or 1, we should try to handle it. 
     instance = nil; 
     break; 
} 

我強烈建議通過一些Objective-C和/或C教程去 - 如果您有與語法的基礎知識的問題，你會發現它很難取得多大進展。堆棧溢出不是學習這種事情的最佳方式。