ios - 在 Swift 中使用 UIPageViewController 直接跳转到特定页面
<p><p>我正在使用 UIPageViewController 来滑动图像。 ViewController 中有一组小图像，然后我转到另一个仅显示较大图像的 ViewController 。我创建了一个带有 ScrollView 的页面 ViewController ，它工作正常，但它总是从第一张图像开始。假设第一个 Controller 有五个小图像，假设用户点击第三个图像以查看更大尺寸的图像，则第二个 Controller 显示更大图像的segue成功完成，当前页面也设置为3但图像是第一个图像。当我使用第二个 Controller 时，我传递包含图像 url 的数组，并根据在第一个 View 上单击的索引设置当前页面，但图像是数组中的第一个图像。 </p>
<p> <a href="/image/c79Vw.jpg" rel="noreferrer noopener nofollow"><img src="/image/c79Vw.jpg" alt="enter image description here"/></a> </p>
<p> <a href="/image/8KvYx.jpg" rel="noreferrer noopener nofollow"><img src="/image/8KvYx.jpg" alt="enter image description here"/></a> </p>
<p>我该如何解决这个问题？下面是代码:</p>
<pre><code>import UIKit
class ImageViewerViewController: UIViewController, UIScrollViewDelegate {
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var pageControl: UIPageControl!
var seguedAlbumImagePathArray=[]
var seguedCurrentImageIndex: Int?
var totalPages: Int = 0
//let sampleBGColors: Array<UIColor> =
override func shouldAutorotate() -> Bool {
return false
}
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
return UIInterfaceOrientationMask.Portrait
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
totalPages = seguedAlbumImagePathArray.count
view.bringSubviewToFront(pageControl)
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
configureScrollView()
configurePageControl()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return UIStatusBarStyle.LightContent
}
// MARK: Custom method implementation
func configureScrollView() {
// Enable paging.
scrollView.pagingEnabled = true
// Set the following flag values.
scrollView.showsHorizontalScrollIndicator = false
scrollView.showsVerticalScrollIndicator = false
scrollView.scrollsToTop = false
// Set the scrollview content size.
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * CGFloat(totalPages), scrollView.frame.size.height)
// Set self as the delegate of the scrollview.
scrollView.delegate = self
// Load the ImageView view from the ImageView.xib file and configure it properly.
for i in 0 ..< totalPages {
// Load the ImageView view.
let imageView = NSBundle.mainBundle().loadNibNamed("ImageView", owner: self, options: nil) as! UIView
imageView.backgroundColor = UIColor.blackColor()
// Set its frame and the background color.
imageView.frame = CGRectMake(CGFloat(i) * scrollView.frame.size.width, scrollView.frame.origin.y, scrollView.frame.size.width, scrollView.frame.size.height)
//imageView.backgroundColor = sampleBGColors
// Set the proper message to the test view's label.
let label = imageView.viewWithTag(1) as! UILabel
label.text = "\(i + 1)/\(totalPages)"
// Set the proper message to the test view's label.
let imagev = imageView.viewWithTag(2) as! UIImageView
view.sendSubviewToBack(imagev)
if let imageData = NSUserDefaults.standardUserDefaults().objectForKey(seguedAlbumImagePathArray as! String),
let imageToDisplay = UIImage(data: imageData as! NSData) {
imagev.image = imageToDisplay
view.sendSubviewToBack(imagev)
}
else {
ImageLoader.sharedLoader.imageForUrl(seguedAlbumImagePathArray as! String, completionHandler:{(image: UIImage?, url: String) in
imagev.image = image
})
}
// Add the test view as a subview to the scrollview.
scrollView.addSubview(imageView)
}
}
func configurePageControl() {
// Set the total pages to the page control.
pageControl.numberOfPages = totalPages
// Set the initial page.
pageControl.currentPage = seguedCurrentImageIndex!
}
// MARK: UIScrollViewDelegate method implementation
func scrollViewDidScroll(scrollView: UIScrollView) {
// Calculate the new page index depending on the content offset.
let currentPage = floor(scrollView.contentOffset.x / UIScreen.mainScreen().bounds.size.width);
// Set the new page index to the page control.
pageControl.currentPage = Int(currentPage)
}
// MARK: IBAction method implementation
@IBAction func changePage(sender: AnyObject) {
// Calculate the frame that should scroll to based on the page control current page.
var newFrame = scrollView.frame
newFrame.origin.x = newFrame.size.width * CGFloat(pageControl.currentPage)
scrollView.scrollRectToVisible(newFrame, animated: true)
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>好的，我找到了出路，我可以使用滚动分页来达到预期的效果，这是我用来转到 ScrollView 的特定页面的代码:</p>
<pre><code>var frame: CGRect = scrollView.frame
frame.origin.x = frame.size.width * CGFloat(seguedCurrentImageIndex!)
frame.origin.y = 0
scrollView.scrollRectToVisible(frame, animated: false)
</code></pre></p>
<p style="font-size: 20px;">关于ios - 在 Swift 中使用 UIPageViewController 直接跳转到特定页面，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/38621665/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/38621665/
</a>
</p>
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