看到UIScrollView的背景的大面積放大的和向下平移

問題時：看到UIScrollView的背景的大面積放大的和向下平移

我遇到的問題是，當我放大到我的UIScrollView（啓用了分頁），然後我平移（滾動？）向下 - 我可以很好地拖過我的視圖並查看scrollview背景的大部分區域。我放大的越遠，UIScrollView的背景就越多。（我已經將scrollview的背景設置爲綠色，所以我可以告訴我在看什麼）。

不知道爲什麼背景區域暴露如此...？

我已經玩過在各個位置設置滾動視圖的框架大小，邊界大小，內容大小等無濟於事。

不幸的是我不能發佈的截圖發生了什麼，由於是一個新的用戶:(

進一步瞭解詳細：

我的應用程序的主視圖包含一個全屏幕的大小UIScrollView中填充了一系列的UIView子視圖這些子視圖通過在for循環中創建nib名稱添加到滾動視圖中，然後使用loadNibNamed方法檢索它們以創建&添加UIView

每個UIView都是在IB中設計的d包含以下內容：一個UIImageView，其圖像屬性設置爲.jpg圖像，另一個較小的UIScrollView，以及一個透明的UIView，位於包含一堆定製UIButton的imageview之上。

當我填充我的scrollView後，我設置它的一些屬性，如contentSize，pagingEnabled，min & maxZoomScale等。&然後將它的委託設置爲self（MainViewController）。

MainViewController的相關方法：

@implementation MainViewController_iPhone 

@synthesize scrollView, loadedNibView; 

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [self loadNibs]; 
    [self initializeOrientation]; 
} 

-(void) loadNibs { 
    currentPage = 0; 

    for (int i = 0; i < NUM_VIEWS; i++) { 
     loadedNibView = [self getNibView:i];  //load the UIView from the associated nib file 
     loadedNibView.tag = i;      //used later to retrieve view for current page 
     [scrollView addSubview:loadedNibView]; 
    } 

    //Set the content size to sum of the widths of the all UIViews 
    scrollView.contentSize = CGSizeMake(self.view.frame.size.width * NUM_VIEWS, self.view.frame.size.height); 
    scrollView.pagingEnabled = YES; 
    scrollView.bounces = YES; 
    scrollView.clipsToBounds = YES;     
    //scrollView.alwaysBounceVertical = YES; 

    //zoom features 
    scrollView.maximumZoomScale = 5.0; 
    scrollView.minimumZoomScale = 1;     

    scrollView.delegate = self;      
} 

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)myScrollView { 
    return [myScrollView viewWithTag:(currentPage)]; 
} 

- (void)scrollViewDidScroll:(UIScrollView *)myScrollView { 
    CGFloat pageWidth = myScrollView.frame.size.width; 
    currentPage = floor((myScrollView.contentOffset.x - pageWidth/2)/pageWidth) + 1; 
} 

- (void)scrollViewDidZoom:(UIScrollView *)myScrollView { 
} 

- (void)scrollViewWillBeginZooming:(UIScrollView *)myScrollView withView:(UIView *)view 
{ 
    //zooming & paging do not work well together; disable paging while we're zooming 
    myScrollView.pagingEnabled = NO; 
} 

- (void)scrollViewDidEndZooming:(UIScrollView *)myScrollView withView:(UIView *)view atScale:(float)scale 
{ 
    if(scale == 1) //if we're zoomed entirely back out 
    { 
    //re-enable paging & reset the content size 
    myScrollView.pagingEnabled = YES; 
    scrollView.contentSize = CGSizeMake(self.view.frame.size.width * NUM_VIEWS, self.view.frame.size.height); //without this line, can no longer page through scrollview after zooming 
    } 
} 


@end

而且它的.H：

@interface MainViewController_iPhone : MainViewController <UIScrollViewDelegate> { 
    IBOutlet UIScrollView *scrollView;   //The main ScrollView that scrolls between pages of different images to search 
    UIView *loadedNibView;      //The UIView that we load from it's corresponding nib (i.e. IMG1_iPhone.xib) 
    int currentPage; 
} 

//methods 
-(void) loadNibs; 
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)myScrollView; 
- (void)scrollViewWillBeginZooming:(UIScrollView *)myScrollView withView:(UIView *)view; 
- (void)scrollViewDidEndZooming:(UIScrollView *)myScrollView withView:(UIView *)view atScale:(float)scale; 
- (void)scrollViewDidZoom:(UIScrollView *)myScrollView; 
- (void)scrollViewDidScroll:(UIScrollView *)myScrollView; 

//properties 
@property (nonatomic, retain) UIScrollView *scrollView; 
@property (nonatomic, retain) UIView *loadedNibView; 

@end

任何意見/建議將不勝感激...謝謝！

來源

2011-03-04 NMS

好吧，我想清楚我的問題是什麼。

我意識到，當我放大第一幅圖像時，它給我帶來的怪異行爲，滾動視圖背景隨着放大而增大，但是如果我放大第二幅圖像 - 沒有奇怪的行爲。所以我開始想知道這兩幅圖像之間有什麼區別......並意識到它一定是標籤。在for循環中，我加載視圖&設置它們的標記我將第一個設置爲零，然後從那裏遞增。糟糕 - 有點忘了，有一堆其他視圖&對象的默認標籤爲零！所以後來當它詢問標籤爲0的視圖時 - 它返回的是其他視圖&，這是獲取調整大小而不是我的圖像。

修復：

#define ZOOM_TAG 1000 

... 


for (int i = 0; i < NUM_VIEWS; i++) { 
    loadedNibView = [self getNibView:i]; 
    //loadedNibView.tag = i 
    loadedNibView.tag = i + ZOOM_TAG; //used later to retrieve view for current page 
    [scrollView addSubview:loadedNibView]; 
} 

... 

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)myScrollView { 

    //return [myScrollView viewWithTag:(currentPage)]; 
    return [myScrollView viewWithTag:(currentPage + ZOOM_TAG)]; 

}

來源

2011-03-09 16:33:59 NMS

看到UIScrollView的背景的大面積放大的和向下平移

回答

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