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Short answer: UIKit does not document a supported one-call method that turns a legacy UIWebView into a bitmap of its entire scrollable HTML document. UIWebView is deprecated, and Apple says to use WKWebView instead. The documented drawHierarchy(in:afterScreenUpdates:) method captures the view hierarchy “as visible onscreen,” not guaranteed offscreen web content.
If you only need what the user can currently see, capture the viewport in your IBAction with UIGraphicsImageRenderer. If you need the whole document, treat it as a rendering or export problem, migrate to WKWebView, and validate the approach against your actual HTML and deployment target rather than trusting the common “resize to contentSize and draw” recipe.
What “full UIWebView screenshot” can mean
Before writing the action, decide which artifact your feature actually needs:
- Viewport bitmap: the pixels currently visible in the web view.
- Whole-document image: one tall bitmap containing content below the current viewport.
- Document export: a PDF or other paginated representation that preserves a long document more naturally than one enormous bitmap.
These are different operations. A larger image context only allocates a larger bitmap; it does not force WebKit to lay out, load, or paint every offscreen element. Lazy images, scripts, animations, cross-origin resources, and content that appears only after scrolling make a full-document image especially dependent on the page and OS version.
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| Requirement | What the documented API establishes | Practical decision |
|---|---|---|
| Current visible screen | drawHierarchy(in:afterScreenUpdates:) renders the hierarchy as visible onscreen. |
Use a viewport capture in the action. |
| All scrollable HTML in one image | No official guarantee that resizing UIWebView to scrollView.contentSize paints every offscreen pixel. |
Use a separately validated rendering/export design. |
| New or maintained app | Apple marks UIWebView deprecated and directs developers to WKWebView. |
Migrate instead of expanding a legacy workaround. |
Why the usual content-size recipe is not a guarantee
UIWebView exposes its associated UIScrollView through scrollView. That gives you scroll metrics, including contentSize, but the API reference does not promise that assigning those dimensions to an image context and drawing the view will render the complete web document.
UIKit’s hierarchy-drawing contract is deliberately narrower: it renders a snapshot of the complete view hierarchy as visible onscreen into the current context. A Boolean result can be false when image data is missing for a view. Consequently, this pattern is not a verified universal solution:
let size = webView.scrollView.contentSize
// Creating an image context of `size` does not, by itself, make
// offscreen UIWebView content render into that context.Do not describe that snippet as a supported full-page API. If you test a legacy technique for a specific app, report the exact iOS versions, web content, and loading conditions under which it worked. There is no official guarantee here for lazy-loaded elements, animated content, or every cross-origin resource.
Capture the visible UIWebView in an IBAction
For a viewport screenshot, use the modern renderer API. UIGraphicsBeginImageContext is deprecated; UIGraphicsImageRenderer is the current choice for new code.
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Connect a UIWebView outlet named webView and a button to this action. Set the web view’s delegate to the view controller and do not enable the capture button until loading has finished.
import UIKit
final class LegacyWebViewController: UIViewController, UIWebViewDelegate {
@IBOutlet private weak var webView: UIWebView!
@IBOutlet private weak var captureButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
webView.delegate = self
captureButton.isEnabled = false
}
func webViewDidFinishLoad(_ webView: UIWebView) {
captureButton.isEnabled = true
}
func webView(_ webView: UIWebView,
didFailLoadWithError error: Error) {
captureButton.isEnabled = false
// Present an error or retry UI appropriate for your app.
}
@IBAction private func captureViewport(_ sender: UIButton) {
guard !webView.isLoading else {
return // The delegate has not reported a finished page yet.
}
webView.layoutIfNeeded()
let format = UIGraphicsImageRendererFormat()
format.scale = webView.window?.screen.scale ?? UIScreen.main.scale
let renderer = UIGraphicsImageRenderer(
size: webView.bounds.size,
format: format
)
var hierarchyRendered = false
let image = renderer.image { _ in
hierarchyRendered = webView.drawHierarchy(
in: webView.bounds,
afterScreenUpdates: true
)
}
guard hierarchyRendered else {
// Apple documents a false result when image data is missing.
presentCaptureFailure()
return
}
// Use `image` here: show it in an image view, write PNG/JPEG data,
// or pass it to the next step in your app.
handleCapturedImage(image)
}
private func presentCaptureFailure() {
// Replace with your app's alert or logging path.
}
private func handleCapturedImage(_ image: UIImage) {
// Replace with your save/share path.
}
}This produces the web view’s current viewport, not a whole scrollable document. The renderer’s pixel dimensions follow the screen scale, so a Retina device produces a higher-resolution bitmap than a scale-1 simulator. The capture should run after the page has finished loading and after any visual changes you require have been committed.
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Objective-C action shape
If the legacy project is Objective-C, the same boundaries apply: wait for webViewDidFinishLoad:, size the renderer to webView.bounds, call drawHierarchyInRect:afterScreenUpdates:, and check its Boolean return value. Do not substitute the deprecated UIGraphicsBeginImageContext merely because the project uses Objective-C.
How to approach a genuinely whole-document result
1. Migrate the web view
Apple documents WKWebView as the replacement for UIWebView, including for apps targeting iOS 8 and later. It can be created in Interface Builder or programmatically. Migration removes the deprecated control from the design, but it still does not make every long-page rasterization strategy automatically reliable.
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Ask whether the consumer really needs a single image. A PDF or other document artifact can be a better fit for a long report, because it avoids an extremely tall bitmap and gives you pagination. If an image is mandatory, decide how you will handle page breaks, image quality, links, fonts, JavaScript-generated sections, and content that loads only after interaction.
3. Make page readiness explicit
- Wait for the web view’s load-completion callback.
- Wait for application-specific DOM content, not merely the first navigation completion, when scripts add the important content later.
- Account for lazy-loaded images and infinite-scroll sections; a page may not contain all content until it is scrolled or otherwise activated.
- Freeze or disable animations if a deterministic image matters.
- Test on every deployment target and with representative pages, including failures and offline states.
4. Rasterize only after validating the renderer
The available Apple API descriptions do not specify a guaranteed full-document UIWebView pipeline. Do not publish a resize-and-draw workaround as universally correct. If your product has a narrow, controlled HTML template, validate your chosen export or rendering method on that exact template and document its limits.
Common failure modes and fixes
The image contains only the visible area
Cause: You used a viewport hierarchy-drawing API; its documented scope is what is visible onscreen.
Fix: Keep it for viewport capture. For a whole document, redesign around a validated export/render path or migrate to WKWebView; increasing the bitmap height alone is not evidence of correctness.
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The screenshot is blank or partly missing
Cause: The page is still loading, a view has not produced image data, or dynamic resources have not arrived.
Fix: Gate the action on the load delegate, call layoutIfNeeded(), use afterScreenUpdates: true, and handle a false return from drawHierarchy. Add page-specific readiness checks for script-generated content.
The capture button works intermittently
Cause: The action races navigation, layout, or an animation.
Fix: Disable the button during navigation, re-enable it from the completion delegate, and capture only after the required visual state has been applied.
The app becomes slow or runs out of memory
Cause: A full-length bitmap can be very large, especially at Retina scale.
Fix: Prefer a document artifact for long content, capture the viewport, reduce the required output dimensions, or process pages/sections separately if your validated design permits it. Never assume that one giant image is the cheapest or most stable representation.
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- Capture only after the page and layout are ready.
- Use
UIGraphicsImageRendererfor new bitmap code. - Check the hierarchy-drawing Boolean result.
- Keep viewport capture and whole-document export as separate features in your API and UI.
- Test dynamic, lazy-loaded, animated, and cross-origin content on the oldest supported OS.
- Record the exact content and OS conditions for any legacy workaround; do not generalize from one page.
- Plan for failure states such as navigation errors, blank pages, and missing resources.
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If your real goal is a clean screenshot of a public web page rather than an in-app UIWebView bitmap, ScreenshotNeo provides a one-request website screenshot API. It accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and the response reports the page verdict and billing status in X-Page-Verdict and X-Billed headers. It also offers an MCP server for AI agents, with take_screenshot, get_page_info, and capture_pdf tools.
For a full-page capture, lazy images, CSS/JavaScript, selectors, device presets, dark mode, custom headers or cookies, geolocation, transparent backgrounds, resizing, caching, signed links, asynchronous webhooks, and bulk capture are available as request options. Those controls solve website capture; they are not an API for rendering a private, in-process UIWebView instance.
See the ScreenshotNeo API documentation for request parameters. A cURL request is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe same request in Python:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
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Can I guarantee that an iframe or cross-origin resource appears in the full image?
No guarantee is established for the legacy approach. Resource loading, security boundaries, lazy loading, and the target WebKit version can all affect the result, so test the exact content you ship.
Should I keep UIWebView for a new feature?
No. Keep it only for constrained legacy maintenance while planning migration; Apple’s documented replacement is WKWebView.
Frequently Asked Questions
Does Apple’s iPhone “Full Page” screenshot feature provide an app API for UIWebView?
No. It is a user-facing device workflow, not an API contract for capturing a web view from an IBAction.
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Can an iframe or cross-origin resource be guaranteed in a full image?
No. The legacy approach has no such guarantee; loading behavior, security boundaries, lazy content, and the WebKit version can change the result.
Should UIWebView be used for a new feature?
No. Apple’s documented replacement is WKWebView; retain UIWebView only for constrained legacy maintenance.
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