MPVolumeView和iOS 5

Question

我正在尝试制作一个滑块来控制设备音量.以前我用MPVolumeView完成了这个,但是从iOS 5开始我在构建时遇到以下错误:

Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_MPVolumeView", referenced from:
  objc-class-ref in PlayerViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

有人可以告诉我是什么问题或者是否有其他方法来控制设备音量.

提前致谢!

Answer 1

你需要确保链接到 MediaPlayer.framework