Xcode 11：未更新到应用程序或断点的代码更改不起作用

Question

XCode: 11.1 OS: 10.15 Test device: iPhone 5s, iOS: 12.4.2

Hi guys, I made a stupid mistake to immediately upgrade Xcode and MacOS, without waiting for a later stable version.

Anyway, if I made changes in my code, for example adding a NSLog() line, this addition is not updated on the app in my test device. To make it work, I have to uninstall the app from the test device, and reinstall it by running the code from Xcode. This happens every time I make changes in code. I have to delete the app on the device and reinstall it again.

I was looking for a solution on the internet, but didn't find any. I assume this is a Xcode bug, but I'm also curious if you have the same problem. If hope someone has a quick fix.

Update 1 On the simulator it works ok.

Answer 1

Try changing the Build System to Legacy :

File > Project Settings > Build System

The new Build System has some problems with app cache.

Answer 2

This happened to me, even changing something simple like a print would cause the breakpoints to stop working. I would have to reinstall the app on the test device every time I made a change for it to be reflected in the app. After I restarted the test phone, Xcode, and cleaned the build folder it worked for me.

Try to restart the test device, then run the app again. If this does not work:

• Navigate to ~/library/MobileDevice/Provisioning Profiles/

• Remove the.mobileprovision file that corresponds to the app you are working on. (you have to click on the files to see what they are, otherwise its just a long string)

• Navigate to ~/library/Developer/Xcode/DerivedData/YOUR_APP_NAME

• Remove the build folder

• close Xcode, uninstall the app, restart the phone, open the Xcode project, clean the build folder, run the app