Question

问题：

我遇到的问题是当我放大我的UIScrollView（启用分页），然后我平移（滚动？） - 我可以拖过我的视图并看到大面积的scrollview的背景。我进一步放大了，UIScrollView的背景就越多了。（我已将scrollview的背景设置为绿色，因此我可以告诉我正在查看的内容。）

不确定为什么背景区域会像那样曝光......？

我已经玩过在各个位置设置scrollview的帧大小，边界大小，内容大小等无济于事。

不幸的是，由于成为新用户，我无法发布最新消息的截图:(

更多详情：

我的应用程序的主视图包含一个全屏大小的UIScrollView，其中填充了许多UIView子视图。通过在for循环中创建nib名称，然后使用loadNibNamed方法检索它们来创建＆amp ;,将这些子视图添加到scrollview中。添加UIView。

这些UIViews中的每一个都是在IB中设计的，包含以下内容：一个UIImageView，其图像属性设置为.jpg图像，另一个较小的UIScrollView，以及透明的UIView在我的imageview顶部，其中包含一堆自定义UIButtons。

在我填充scrollView之后，我设置了一些属性，例如contentSize，pagingEnabled，min＆amp; maxZoomScale等＆amp;然后将它的委托设置为self（MainViewController）。

MainViewController的相关方法：

@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

这是.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

非常感谢任何想法/建议......谢谢！

Answer 1

好的，我弄清楚我的问题是什么。

我意识到，当我放大第一张图片时，它给了我奇怪的行为，滚动视图背景随着我缩放而增长，但如果我放大第二张图像 - 没有奇怪的行为。所以我开始想知道这两个图像之间有什么区别......并且意识到它必须是标签。在for循环中我加载视图＆amp;设置他们的标签我将第一个设置为零，并从那里递增。哎呀 - 有点忘了还有很多其他观点＆amp;默认标记为零的对象！所以后来当它要求带有标签0的视图时 - 它返回了一些其他视图＆amp;这是一个调整大小而不是我的形象。

修正：

#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)];

}

在放大时看到大面积的UIScrollView背景＆amp;平躺下来

1 个答案: