問題描述

我想創建一個 UIScrollView 的屏幕截圖，它應該包含滾動視圖的全部內容，甚至包括當前對用戶不可見的內容.為此，我嘗試了以下兩種方法:

func snapShot(view:UIView) ->UIImage {UIGraphicsBeginImageContextWithOptions(view.bounds.size, true, 0);view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true);讓圖像 = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();返回圖像；}func snapShotScrollView(scrollView:UIScrollView) ->UIImage {讓 bounds = scrollView.bounds;scrollView.bounds.size = scrollView.contentSize;讓圖像 = snapShot(scrollView);scrollView.bounds = 邊界；返回圖像；}

但生成的圖像仍然只是顯示滾動視圖中當前對用戶可見的那些視圖元素.但我想查看所有視圖.

我該怎么做?

編輯

我也試過了:

func 快照() ->圖像?{變種圖像:UIImage?UIGraphicsBeginImageContext(scrollView.contentSize)讓 savedContentOffset = scrollView.contentOffset讓 savedFrame = scrollView.frame;scrollView.contentOffset = CGPoint.zero;scrollView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height);scrollView.layer.render(in: UIGraphicsGetCurrentContext()!)圖像 = UIGraphicsGetImageFromCurrentImageContext();scrollView.contentOffset = savedContentOffset;scrollView.frame = savedFrame;UIGraphicsEndImageContext();返回圖片}

編輯 2

我的 UIScrollView 放置在 UIView 內，并且確實包含 UIStackView.該視圖被設計為一個彈出視圖，因此看起來像是彈出了一個對話.我第一次編輯的代碼示例在一個空白的 UIViewController 中工作，只有一個 UIScrollView 但不在上述星座中.

從

I want to create a screenshot of a UIScrollView which should contain the whole content of the scroll view, even that content, which is currently not visible to the user. For that I tried the following two methods:

func snapShot(view:UIView) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, true, 0);

    view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true);

    let image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;
}

func snapShotScrollView(scrollView:UIScrollView) -> UIImage {
    let bounds = scrollView.bounds;

    scrollView.bounds.size = scrollView.contentSize;

    let image = snapShot(scrollView);

    scrollView.bounds = bounds;

    return image;
}

But the resulting image is still just showing those view elements inside the scroll view which are currently visible to the user. But I want to see all views.

How can I do that?

EDIT

I also tried:

func snapshot() -> UIImage? {
    var image: UIImage?

    UIGraphicsBeginImageContext(scrollView.contentSize)

    let savedContentOffset = scrollView.contentOffset
    let savedFrame = scrollView.frame;

    scrollView.contentOffset = CGPoint.zero;
    scrollView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height);

    scrollView.layer.render(in: UIGraphicsGetCurrentContext()!)
    image = UIGraphicsGetImageFromCurrentImageContext();

    scrollView.contentOffset = savedContentOffset;
    scrollView.frame = savedFrame;

    UIGraphicsEndImageContext();

    return image
}

Edit 2

My UIScrollView is placed inside a UIView and does contain a UIStackView. The View is designed as a popover view so that it looks like a dialogue is popping up. The code sample from my first edit is working in a blank UIViewController with only one UIScrollView but not in the mentioned constellation.

To Swift from this answer, adding a test ViewController:

class ScreenShotTestViewController: UIViewController {

    var scrollView: UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()
        scrollView = UIScrollView(frame: CGRect(origin: CGPoint.zero, size: view.frame.size))
        scrollView.contentSize = CGSize(width: view.frame.size.width, height: view.frame.size.height * 2)
        scrollView.backgroundColor = UIColor.yellow
        view.addSubview(scrollView)

        let label = UILabel(frame: CGRect(x: 0.0, y: view.frame.size.height * 1.5, width: view.frame.size.width, height: 44.0))
        label.text = "Hello World!"
        scrollView.addSubview(label)

        let screenShot = snapshot()
    }

    func snapshot() -> UIImage?
    {      
        UIGraphicsBeginImageContext(scrollView.contentSize)

        let savedContentOffset = scrollView.contentOffset
        let savedFrame = scrollView.frame

        scrollView.contentOffset = CGPoint.zero
        scrollView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height)

        scrollView.layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()

        scrollView.contentOffset = savedContentOffset
        scrollView.frame = savedFrame

        UIGraphicsEndImageContext()

        return image
    }
}

Results in an image of the complete content, including subviews:

這篇關于如何截取 Scrollview 的所有內容?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！