能否在App内引导用户跳转至iOS系统版本更新页面？

Hey there! Great question—yes, you absolutely can guide users to the iOS system update page from inside your app, but there are a few key methods, limitations, and best practices to keep in mind to ensure it works reliably and passes App Store review.

Recommended Method: App Store Link (Stable & Approved) #

The most reliable and Apple-approved way is to link directly to the iOS app listing on the App Store. This page will either show an "Update" button if a new iOS version is available, or redirect users to the Settings app's software update section automatically.

Here’s how to implement this in Swift:

guard let iosUpdateUrl = URL(string: "https://apps.apple.com/us/app/ios/id1146719234") else { return }

UIApplication.shared.open(iosUpdateUrl) { success in
    if !success {
        // Show a friendly alert to users if the link fails to open
        let alert = UIAlertController(title: "Oops!", message: "Couldn't open the update page. Please go to Settings > General > Software Update manually.", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        self.present(alert, animated: true)
    }
}

Alternative Method: Direct Settings Deep Link (Less Stable) #

You can also use a URL scheme to jump straight to the "Software Update" section in the Settings app. This is more direct, but note that Apple doesn’t officially document this scheme, so it might break in future iOS versions. It’s still widely used, but you should always include a fallback.

Step 1: Add Scheme to Info.plist #

First, add App-Prefs to the LSApplicationQueriesSchemes array in your Info.plist (required for iOS 10+ to check if the scheme is supported):

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>App-Prefs</string>
</array>

Step 2: Implement the Deep Link #

Here’s the Swift code to handle the direct Settings link with a fallback to the App Store:

// Try direct Settings deep link first
if let settingsUpdateUrl = URL(string: "App-Prefs:root=General&path=SOFTWARE_UPDATE") {
    if UIApplication.shared.canOpenURL(settingsUpdateUrl) {
        UIApplication.shared.open(settingsUpdateUrl) { success in
            if !success {
                self.openAppStoreUpdateLink()
            }
        }
    } else {
        self.openAppStoreUpdateLink()
    }
} else {
    self.openAppStoreUpdateLink()
}

// Helper function for fallback
private func openAppStoreUpdateLink() {
    guard let iosUpdateUrl = URL(string: "https://apps.apple.com/us/app/ios/id1146719234") else { return }
    UIApplication.shared.open(iosUpdateUrl)
}

Critical Notes for Implementation #

• App Store Review: Apple allows linking to system updates if it’s necessary for your app to function (e.g., a feature requires iOS 17+). Avoid using these links for unnecessary prompts—this could lead to rejection.
• iOS Version Compatibility: The Settings URL scheme may change between iOS versions. Always test on multiple iOS versions and rely on the App Store link as a fallback.
• Failure Handling: Never assume the link will open successfully. Always include a backup plan (like directing users to manual update instructions) if the open request fails.

内容的提问来源于stack exchange，提问作者David Breen