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Merge branch 'master' of https://github.com/easemob/sdkexamples-ios

# By winterSleep
# Via winterSleep
* 'master' of https://github.com/easemob/sdkexamples-ios:
  添加手机靠近耳朵时, 音频切换到听筒播放代码.
  添加手机靠近耳朵时, 音频切换到听筒播放代码.