檢測滾動視圖上的圖像

Question

幫助我請滾動查看哪個圖像在滾動視圖上。

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
NSArray *colors = [[NSArray alloc] initWithObjects:@"ip1.jpg", @"ip2.jpg", @"ip3.jpg", @"ip4.jpg", @"ip5.jpg", @"ip6.jpg", @"ip7.jpg", @"ip8.jpg", @"ip9.jpg", @"ip10.jpg",@"ip11.jpg",@"ip12.jpg",@"ip13.jpg",@"ip14.jpg",@"ip15.jpg",@"ip16.jpg",@"ip17.jpg",@"ip18.jpg",@"ip19.jpg",@"ip20.jpg",@"ip21.jpg", nil]; 

    NSMutableArray *imgArray = [[NSMutableArray alloc] init]; 
    UIImageView *tempImageView; 
    for(NSString *name in colors) { 
     tempImageView = [[UIImageView alloc] init]; 
     tempImageView.contentMode = UIViewContentModeScaleAspectFill; 
     tempImageView.image = [UIImage imageNamed:name]; 
     [imgArray addObject:tempImageView]; 

    } 

    CGSize pageSize = scrollView.frame.size; // scrollView is an IBOutlet for our UIScrollView 
    NSUInteger page = 0; 
    for(prevView in imgArray) { 

     [scrollView addSubview:prevView]; 


     // This is the important line 
     prevView.frame = CGRectMake(pageSize.width * page++ + 30, 0, pageSize.width - 60, pageSize.height); 
} 




    scrollView.contentSize = CGSizeMake(pageSize.width * [imgArray count], pageSize.height); 

} 



- (void)scrollViewDidScroll:(UIScrollView *)sender { 
    if (!pageControlBeingUsed) { 
     // Switch the indicator when more than 50% of the previous/next page is visible 
     CGFloat pageWidth = self.scrollView.frame.size.width; 
     int page = floor((self.scrollView.contentOffset.x - pageWidth/2)/pageWidth) + 1; 
     self.pageControl.currentPage = page; 



    } 
} 

請幫助我。如果我使用slog來顯示CurrentPage，它會顯示我喜歡「117892」，我只需要一個NSLog，它將顯示我的「顏色」NSArray中的當前圖像。非常感謝

Answer 1

試試這個，你可以聲明 「頁」 變量作爲全球然後在代碼

NSLog(@"%@",[colors objectAtIndex:page]);