iphone - 如何使用网页 View 作为页面( subview )进行无缝滚动 View

我想制作一个无缝的scrollView
滚动 View 应将Web View 作为其 subview
并应无缝滚动

问题是...
我引用了

http://iosdevelopertips.com/user-interface/creating-circular-and-infinite-uiscrollviews.html#comment-66679

现在我只用了3页就实现了无缝的滚动 View ，但是我希望将Webview替换为label ...

最佳答案

缺口
在viewDidLoad中，我们必须编写以下代码。

- (void)viewDidLoad
{
    [super viewDidLoad];

    documentTitles = [[NSMutableArray alloc] init];
    arrayWebViews = [[NSMutableArray alloc] init];

    // create our array of documents
    for (int i = 0; i < 5; i++)
    {
        [documentTitles addObject:[NSString stringWithFormat:@"index%i",i]];
    }

    // create webviews for the html files

    webOne = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
    webTwo = [[UIWebView alloc] initWithFrame:CGRectMake(320, 0, 320, 400)];
    webThree = [[UIWebView alloc] initWithFrame:CGRectMake(640, 0, 320, 400)];

    // load all three pages into our scroll view
    [self loadPageWithId:2 onPage:0];
    [self loadPageWithId:0 onPage:1];
    [self loadPageWithId:1 onPage:2];

    // add them as the subview of scrollview
    [scrollView addSubview:webOne];
    [scrollView addSubview:webTwo];
    [scrollView addSubview:webThree];

    // adjust content size for three pages of data and reposition to center page
    scrollView.contentSize = CGSizeMake(960, 400);
    [scrollView scrollRectToVisible:CGRectMake(320,0,320,400) animated:NO];
}

现在在loadPageWithID:andPage:方法中编写以下代码

- (void)loadPageWithId:(int)index onPage:(int)page
{
    switch (page)
    {
        case 0:
            {
                self.webOne.backgroundColor = [UIColor clearColor];
                self.webOne.delegate = self;
                [self.webOne loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle]                                                                                              pathForResource:[documentTitles objectAtIndex:index] ofType:@"html"]isDirectory:NO]]];
                [arrayWebViews addObject:self.webOne];
            }
            break;
}

现在在scrollViewDidEndDecelerating中编写以下代码:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)sender
{
    UIWebView* lobjTempWebView = [arrayWebViews objectAtIndex:0];

    for (int indexWebViews = 0; indexWebViews < 2; indexWebViews ++)
    {
        [arrayWebViews replaceObjectAtIndex:indexWebViews withObject:[arrayWebViews objectAtIndex:indexWebViews + 1]];
    }

    [arrayWebViews replaceObjectAtIndex:[arrayWebViews count] - 1 withObject:lobjTempWebView];

    [[arrayWebViews objectAtIndex:0] setFrame:CGRectMake(0, 0, 320, 400)];
    [[arrayWebViews objectAtIndex:1] setFrame:CGRectMake(320, 0, 320, 400)];
    [[arrayWebViews objectAtIndex:2] setFrame:CGRectMake(640, 0, 320, 400)];

    if(scrollView.contentOffset.x > scrollView.frame.size.width)
    {

        currIndex = (currIndex >= [documentTitles count]-1) ? 0 : currIndex + 1;
        nextIndex = (currIndex >= [documentTitles count]-1) ? 0 : currIndex + 1;
        [[arrayWebViews objectAtIndex:2] loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle]                                                                                              pathForResource:[documentTitles objectAtIndex:nextIndex] ofType:@"html"]isDirectory:NO]]];

    }
    // Reset offset back to middle page
    [scrollView scrollRectToVisible:CGRectMake(320,0,320,400) animated:NO];
}