webrtc iOS native : +[UIDevice d

今天学（踩）到了一个 iOS 开发小知识（坑）：如果静态库里定义了 Category，那使用这个静态库的 App 工程里，OtherLinker Flags 还需要加上 -ObjC 这个参数，否则 Category 定义的方法会找不到。

此事缘起于对 WebRTC iOS 静态库的使用，运行时报错 '+[UIDevice deviceType]: unrecognized selector sent toclass 0x1b47d8c60'。

起先我没有尝试求助 Google，而是自己在琢磨，但无果。而 Google 很快给了我答案。所以遇到问题，先 Google 一下也没什么损失，说不定就有答案呢 :)
webrtc iOS native : +[UIDevice deviceType]: unrecognized selector sent toclass 0x3aa4b420

It turned out that this issue was caused by ldfalg "-force_load"option in my application. Changed it to "-ObjC" and it is workingfine now. Please refer to below for more information.

https://groups.google.com/d/msg/discuss-webrtc/G64eXgQh7Xs/eUMhSB8aCgAJ

+[UIDevice deviceType]: unrecognized selector sent to class 0x1a01696a8

webrtc 使用了category 如果需要加载进来需要告诉 other linker flags参数 -ObjC 或者-all_load

https://github.com/RTCat/rtcat_ios_demo3/issues/1

What does the -ObjC linker flag do?

This flag causes the linker to load every object file in the library thatdefines an Objective-C class or category. While this option will typicallyresult in a larger executable (due to additional object code loaded into theapplication), it will allow the successful creation of effective Objective-Cstatic libraries that contain categories on existing classes.

https://stackoverflow.com/a/6630019/3077508