定义全局 NSMutableArray [英] Define global NSMutableArray

问题描述

有没有办法定义一个全局的 NSMutableArray?我希望能够声明数组，以便我可以通过一系列实例方法访问/修改它.这是我下面的代码，我想确保这是我应该做的.

Is there a way to define a global NSMutableArray? I'd like to be able to declare the array so I can access/modify it across a series of instance methods. Here is the code that I have below and want to make sure this is how I should do it.

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate> {
    NSMutableArray *sizedWordList;
}

在 .m 中:

sizedWordList = [[NSMutableArray alloc] init];

- (void)dealloc
{
    [sizedWordList release];
}

推荐答案

在我看来，您不想要一个全局变量，而是一个实例变量.在这种情况下，您的声明:

It seems to me that you do not want a global variable but, instead, an instance variable. In that case, your declaration:

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate> {
    NSMutableArray *sizedWordList;
}

在头文件中是正确的.但是，在实现文件中，您不能在实例方法之外(或者，如果它确实是一个全局变量，则在类方法或函数之外)执行以下操作:

in the header file is correct. However, in the implementation file, you cannot do the following outside of an instance method (or, if it were indeed a global variable, outside of a class method or a function):

sizedWordList = [[NSMutableArray alloc] init];

它在 Objective-C 中是不合法的.初始化实例变量的正确位置是 -init 方法.由于您的类是 UIViewController 的子类，您应该覆盖其指定的初始化程序，-initWithNibName:bundle::

It is not legal in Objective-C. The correct place to initialise instance variables is the -init method. Since your class is a subclass of UIViewController, you should override its designated initialiser, -initWithNibName:bundle::

- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle {
    self = [super initWithNibName:nibName bundle:nibBundle];
    if (self) {
        sizedWordList = [[NSMutableArray alloc] init];
    }
    return self;
}

你的 -dealloc 方法几乎是正确的——记住你应该总是在你的 末尾发送 [super dealloc]-dealloc 方法:

Your -dealloc method is almost correct — remember that you should always send [super dealloc] at the end of your -dealloc method:

- (void)dealloc
{
    [sizedWordList release];
    [super dealloc];
}

完成后，您可以在任何其他实例方法中使用该数组.例如，

Having done that, you can use the array in any other instance method. For instance,

- (void)logWordList {
    NSLog(@"%@", sizedWordList);
}

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