以编程方式添加 PageControl

发布于 2024-08-17 20:40:52 字数 709 浏览 5 评论 0原文

我想以编程方式将 UIPageControl 项添加到我的视图控制器中。 self.view 属性包含一个具有以下属性的 UIScrollView：

scrollView = [[UIScrollView alloc] initWithFrame:applicationFrame];
scrollView.backgroundColor = [UIColor blackColor];
scrollView.maximumZoomScale = 1.0;
scrollView.minimumZoomScale = 1.0;
scrollView.clipsToBounds = YES;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.pagingEnabled = YES;
self.view = scrollView;

到目前为止一切顺利。现在我想通过添加以下内容（几行后）来添加 PageControl 元素：

pageControl.numberOfPages = 2;
pageControl.currentPage = 0;

pageControl 元素是使用 @property 和 @synthesize 合成的。但是，即使我添加 [self.view addSubview:pageControl]; 这也不会显示任何内容。

有什么想法为什么这不起作用吗？

原文

I would like to add a UIPageControl item programmatically to my view Controller. The self.view property contains a UIScrollView with the following properties:

scrollView = [[UIScrollView alloc] initWithFrame:applicationFrame];
scrollView.backgroundColor = [UIColor blackColor];
scrollView.maximumZoomScale = 1.0;
scrollView.minimumZoomScale = 1.0;
scrollView.clipsToBounds = YES;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.pagingEnabled = YES;
self.view = scrollView;

So far so good. Now I wanted to add a PageControl element by adding this (a few lines later):

pageControl.numberOfPages = 2;
pageControl.currentPage = 0;

The pageControl element is synthesized using the @property and @synthesize. However, this does not display anything, even if I add a [self.view addSubview:pageControl];

Any ideas why this is not working?

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顾铮苏瑾 2024-08-24 20:40:52

感谢 Nimrod 的评论，我有了正确的想法，这就是它的工作原理（现在很明显我的版本失败了:)）

// Init Page Control
pageControl = [[UIPageControl alloc] init];
pageControl.frame = CGRectMake(x, y, xx, yy);
pageControl.numberOfPages = 2;
pageControl.currentPage = 0;
[self.view addSubview:pageControl];

Thanks to the comment from Nimrod I had the right idea, here is how it worked (rather obvious now that my version failed :))

// Init Page Control
pageControl = [[UIPageControl alloc] init];
pageControl.frame = CGRectMake(x, y, xx, yy);
pageControl.numberOfPages = 2;
pageControl.currentPage = 0;
[self.view addSubview:pageControl];

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