Xcode 项目不会在 iOS 设备上运行

Question

Xcode gives me this message every-time I try running my app on my iPhone. (Works fine on the simulator.) (And this occurs in every project I have.) (I also just downloaded Xcode again.)

This is the message I get.

App Installation Failed.
Unknown Error Occurred.

How do I fix this error?

Answer 1

拔掉iOS设备并将其插回来为我修复它。

Answer 2

Alright, it was a simple fix:

1. Go into Xcode Preferences -> Accounts -> More Info. Hit the refresh icon.

2. Clean your project. Project -> Clean.

3. Force quit Xcode.

4. Reboot Mac and Device.

Answer 3

如果您有相同的应用程序但是从AppStore下载，我建议您从设备中手动删除应用程序，然后尝试使用XCode运行新版本。

Answer 4

After following the suggestions in this thread (restarting iPhone, cleaning Xcode project, quitting and re-launching Xcode) and others (setting Team to None then back to my Team) and unplugging and replugging Lightning connector from my iPhone 6 I was still experiencing this problem. Xcode would even display an error that my iPhone 6 was locked, even though it was not.

I was able to fix it by unplugging the USB-A connector of the USB to Lightning cable from my MacBook Pro, then plugging it back in. I'm not sure why that made the difference, but glad that it did resolve this annoying problem.

Answer 5

I have this issue regularly. There are a number of techniques that help me overcome it, including the classic "turn it off and back on again."

One thing that isn't mentioned here is that the iPhone should be switched on, unlocked, connected to the mac and then the app should be run (with the iPhone unlocked). Don't lock it!

Answer 6

Make sure your device name doesn't have any emoji (Xcode 11.0)

Answer 7

if you using vpn services, then you need to turn off vpn. Works for me