使用Autolayout的滚动视图尺寸:框架是600x480紧凑/任何尺寸级别,比iPhone 5更大?

时间:2015-02-24 18:07:16

标签: ios swift uiscrollview autolayout

我希望我的scrollview框架与superview框架的尺寸相同。并设置contentsize,使其包含所有imageViews。

问题在于AutoLayout,宽度和高度是600 x 480,我使用的是iphone5,尺寸类是w:Compact / h:Any。(我期望类似:320 x 523)。
我的约束是:具有超视图的等宽度,具有超视图的等高(乘数0.8),水平中心X和垂直中心Y.

let pagesScrollViewSize = scrollView.frame.size
println("pagesScrollViewSize : \(pagesScrollViewSize)") //600x480
scrollView.contentSize = CGSizeMake(pagesScrollViewSize.width * CGFloat(pageCount), pagesScrollViewSize.height)

有人知道如何解决这个问题吗? imageview看起来比屏幕的框架大,因此.SizeAspectFit不遵循正确的尺寸。它不是滚动到另一个imageView,而是滚动查看图像的其余部分,这是我不想要的。

编辑:
这是ViewController.swift中的完整代码:

class ViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var pageControl: UIPageControl!
    @IBOutlet weak var scrollView: UIScrollView!

    var pageViews: [UIImageView?] = []
    var pageImages : [UIImage?] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        pageImages = [UIImage(named:"photo1.png"),
        UIImage(named:"photo2.png"),
        UIImage(named:"photo3.png"),
        UIImage(named:"photo4.png")]

        let pageCount = pageImages.count
        pageControl.currentPage = 0
        pageControl.numberOfPages = pageCount

        for _ in 0..<pageCount {
            pageViews.append(nil)
        }

        let pagesScrollViewSize = scrollView.frame.size
        println("pagesScrollViewSize : \(pagesScrollViewSize)")
        scrollView.contentSize = CGSizeMake(pagesScrollViewSize.width * CGFloat(pageCount), pagesScrollViewSize.height)
        loadVisiblePages()
    }

    //when scrolling
    func scrollViewDidScroll(scrollView: UIScrollView!){
        loadVisiblePages()
    }

    func loadVisiblePages(){
        let pageWidth = scrollView.frame.size.width
        let page = Int(floor( (scrollView.contentOffset.x * 2.0 + pageWidth) / (pageWidth*2.0) ))
        println("page: \(page)")
        pageControl.currentPage = page
        let firstPage = page-1
        let lastPage = page+1
        //remove all the pages before firstPage
        for var index = 0; index < firstPage; ++index{
            purgePage(index)
        }
        //load pages in our range
        for var index = firstPage; index <= lastPage; ++index {
            loadPage(index)
        }
        //remove after lastPage
        for var index = lastPage+1; index < pageImages.count; ++index {
            purgePage(index)
        }
    }

    func loadPage(index:Int){
        if index < 0 || index >= pageImages.count {
            return
        }
        if let pageView = pageViews[index] {
            //already loaded
        }
        else {
            var frame = scrollView.bounds
            frame.origin.x = frame.size.width * CGFloat(index)
            frame.origin.y = 0.0
            println("\(frame)")

            var newImageView = UIImageView(image:pageImages[index])
            newImageView.contentMode = .ScaleAspectFit
            newImageView.frame = frame
            scrollView.addSubview(newImageView)

            pageViews[index] = newImageView
        }
    }

    func purgePage(index:Int){
        if index < 0 || index >= pageImages.count {
            return
        }
        if let pageView = pageViews[index] {
            pageView.removeFromSuperview()
            pageViews[index] = nil
        }
    }

}

由于

1 个答案:

答案 0 :(得分:4)

viewDidAppearviewDidLayoutSubviews之后才会应用尺寸类(或任何自动布局更改)。您需要将此代码移动到其中一个代码中。您正在查看视图的框架,因为它是从Interface Builder文档(xib或storyboard)中加载的。在这些生命周期事件之后,你永远不应该检查框架。

Unable to set frame correctly before viewDidAppear