目标C:将静态变量的值赋给实例变量

我基本上想给类的每个实例一个唯一的ID。

所以,我创建了一个静态整数。每次创建一个新对象时,我都会增加它,然后将静态变量的值赋给一个ivar。但是很明显我不理解,因为,假设我创建了三个对象,“thispagenumber”(它是实例变量)总是3,不管我引用哪个对象。

更多信息:

此类创建许多“页面”对象。我想让每一页都知道它的页码,这样它就可以显示正确的页面艺术以及执行许多其他各种操作。

.h部分代码:

@interface Page : UIViewController
{
    NSNumber            *thisPageNumber;
    UIImageView         *thisPageView;
    UIImageView         *nextPageView;
    UIImageView         *prevPageView;  
    UIImageView         *pageArt;
}

.m部分代码:

@implementation Page

static int pageCount = 0;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
        pageCount++;
        thisPageNumber = pageCount;
    }
    return self;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    CGRect defaultFrame = CGRectMake(0.0, 0.0, 1024.0, 768.0);

    if (thisPageView == nil) {
        thisPageView = [[UIImageView alloc] 
                        initWithImage:[UIImage 
                                       imageNamed:[NSString stringWithFormat:@"Page%i.png", [thisPageNumber intValue]]]];
        thisPageView.frame = defaultFrame;
        [self.view addSubview:thisPageView];
    }

    if (nextPageView == nil && [thisPageNumber intValue] < BOOK_PAGE_COUNT) {
        nextPageView = [[UIImageView alloc] 
                        initWithImage:[UIImage 
                                       imageNamed:[NSString stringWithFormat:@"Page%i.png", [thisPageNumber intValue]+1]]];
        nextPageView.frame = defaultFrame;
        [self.view addSubview:nextPageView];
    }

    if (prevPageView == nil && [thisPageNumber intValue] > 1) {
        prevPageView = [[UIImageView alloc] 
                        initWithImage:[UIImage 
                                       imageNamed:[NSString stringWithFormat:@"Page%i.png", [thisPageNumber intValue]-1]]];
        prevPageView.frame = defaultFrame;
        [self.view addSubview:prevPageView];
    }    
}