iOS跨应用命令调用可行性咨询：无需修改接收端实现方案

Hey there! As someone who's used to Windows' more flexible cross-app communication, iOS's security model will feel pretty restrictive at first—let's break down your questions clearly:

Can one app control another without modifying the target app? #

Short answer: Almost certainly not, and here's why:

• iOS enforces a strict App Sandbox that isolates every app from each other. By design, apps can't access another app's memory, inject input (like keyboard events), or trigger internal menu commands unless the target app explicitly allows it.
• The only way to interact with another app without modifying it is if the target already supports system-approved mechanisms like URL Schemes or Universal Links. But even then, you're limited to the actions the target app has pre-configured (e.g., opening a specific screen, passing basic parameters)—you can't send arbitrary hotkeys or trigger unexposed commands.
• There are no public APIs to simulate keyboard input for another app. Apple blocks this to protect user privacy and prevent malicious apps from hijacking user interactions.

What entry-level APIs are available for inter-app communication? #

If the target app supports the required mechanisms, these are the standard tools:

• URL Schemes: Use UIApplication.shared.open(_:options:completionHandler:) (in Swift/Obj-C) to launch the target app with a custom URL (e.g., myapp://action?value=foo). The target app must register this scheme in its Info.plist.
• Universal Links: A more secure alternative to URL Schemes, using HTTPS links that directly deep-link into the target app. Again, the target app needs to configure associated domains to support this.
• App Extensions: For limited interactions (like sharing content), but this requires the target app to implement an extension point (e.g., Share Extension), which means modifying the target app's code—so this doesn't fit your "no modification" requirement.

Can Qt achieve this on iOS? #

Qt's iOS support is built on top of Apple's native frameworks, so it can't bypass iOS's sandbox restrictions:

• You can use QDesktopServices::openUrl() in Qt to trigger URL Schemes or Universal Links, just like native iOS code. This works if the target app supports those mechanisms.
• Qt has no way to simulate keyboard events or directly control another app's internal commands. Any attempt to do so would be blocked by iOS's security model, and wouldn't pass App Store review if you're distributing publicly.

A quick note: If you're working with enterprise apps (not for the App Store), you might explore MDM solutions or jailbroken devices, but these are non-standard, unsupported, and pose significant security risks.

内容的提问来源于stack exchange，提问作者nearproc