iphone - UIScrollView 和图像缩略图

Question

我想要一个 ScrollView ，每次在 ScrollView 上显示 5 个缩略图。基本上它是一个只有一行的表格，每行都有 5 个缩略图。您向右滑动手指，然后显示下一组 5 个缩略图。

我需要做什么？我们真的需要一个 ScrollView 来做到这一点吗？我该如何开始？

Answer 1

在包含 UIScrollView 的 UIView 中，将此代码(类似于)放置在 -viewDidLoad 中:

UIScreen *screen = [UIScreen mainScreen];
pageWidth = screen.bounds.size.height;
pageHeight = screen.bounds.size.width;


scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, pageWidth, pageHeight)];
[scrollView setAutoresizingMask:UIViewAutoresizingNone];
[scrollView setContentSize:CGSizeMake(numPages * pageWidth, pageHeight)];
[scrollView setContentOffset:CGPointMake(pageWidth, 0)];
[scrollView setPagingEnabled:YES];
[scrollView setDelaysContentTouches:YES];
[scrollView setDelegate:self];
[scrollView setClearsContextBeforeDrawing:NO];
[scrollView setOpaque:YES];

[self.view insertSubview:scrollView atIndex:0];
[scrollView release];

// iterate through your thumbnails - which are UIViews
thumbnailViews = [NSMutableArray array];
[thumbnailViews retain];
NSUInteger pageCounter = 0;

for (...)
    {
    ThumbnailView *thumbnailView = [[ThumbnailView alloc] initWithFrame:CGRectMake( pageCounter*pageWidth, 0, pageWidth, pageHeight )];
    [thumbnailView setMultipleTouchEnabled:YES];
    [thumbnailView setViewController:self]; // this may be necessary to push/pop on navigation controller stack.
    [thumbnailView restoreState];
    [scrollView thumbnailView];
    [thumbnailViews thumbnailView];
    ++pageCounter;
}

在我的例子中，pageWidth、pageHeight、thumbnailViews和scrollView都是我的UIView子类的ivars。