我的 Xcode Objective-C iOS 应用程序在调用静态库中的成员时崩溃

Question

My hello world app running on iPad crashes when it calls my static lib. App does nothing but call member get_string in static lib.

I copied .h & .a to a folder within app's project folder, and added search paths to .h and .a Builds, runs, then crashes.

Answer 1

I think the issue is you're calling a class method/ static function on instance. It should be called like this NSLog(@"----------------- %@ ------------------------", [[hello_world_lib2 class] get_string] );

Answer 2

I got it working. (iOS feels like a form of malware....when you have to program it. How programmer indifferent is Xcode compared with Visual Studio. I remember a few years ago when Xcode rated only 2 stars on the Apple Store itself.)

Anyway, I hope this solution saves others the days of trial-and-error it took me to figure out the magic --- and no Apple dev programming guides or examples for a simple static lib, that I could find.

1. Create static lib project
2. Add functionality. eg. a member fn that returns a string
3. Build
4. Create objC app
5. Create folder for static lib within app proj folder
6. Copy (ctrl drag) .h & .a from static lib proj lefthand product pane to staticLib folder within app folder
7. Import .a & .h: Drag .a and .h from staticLib folder to app's lefthand project window, line beneath proj line
8. Copy app > TARGETS > target > Build settings > All > Search Paths > Library Search Paths to

Header Search Paths
9. Set active scheme to target HW (eg. your iPhone or iPad) 10. Set PROJECT build settings > Basic > Deployment section > iOS Dep Targ = iOS of target HW (eg. 13.6) 11. Verify build ok