1. 屏蔽系统日志
   Xcode8里边 Edit Scheme-> Run -> Arguments, 在Environment Variables里边添加
   OS_ACTIVITY_MODE = Disable

2. Xcode8注释快捷键失效注释快捷键 ⌘ `+ / `失效，在终端输入下面的命令，重启系统即可

   sudo /usr/libexec/xpccachectl
   

__aaa

3. ios10相机等权限获取时的崩溃
   出现的提示信息有：

   This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.
   

   意思是没有获取相机的权限，需要添加在plist文件中添加这项权限

   // 相机权限
   <key>NSCameraUsageDescription</key>
   <string>CameraUsageDescription</string>
   

   以下是所有权限的相关键值：

   // 蓝牙权限
   <key>NSBluetoothPeripheralUsageDescription</key>
    <string>BluetoothPeripheralUsageDescription</string>
   
   // 日历权限
    <key>NSCalendarsUsageDescription</key>
    <string>CalendarsUsageDescription</string>
   // 相机权限
    <key>NSCameraUsageDescription</key>
    <string>CameraUsageDescription</string>
   
   // 联系人
    <key>NSContactsUsageDescription</key>
    <string>ContactsUsageDescription</string>
   
   // 健康分享权限
    <key>NSHealthShareUsageDescription</key>
    <string>HealthShareUsageDescription</string>
   // 健康更新权限
    <key>NSHealthUpdateUsageDescription</key>
    <string>HealthUpdateUsageDescription</string>
   
   // HomeKit使用权限
    <key>NSHomeKitUsageDescription</key>
    <string>HomeKitUsageDescription</string>
   //  位置一直使用权限
    <key>NSLocationAlwaysUsageDescription</key>
    <string>LocationAlwaysUsageDescription</string>
   
   // 使用位置权限
    <key>NSLocationUsageDescription</key>
    <string>LocationUsageDescription</string>
   // 程序运行时使用位置权限
    <key>NSLocationWhenInUseUsageDescription</key>
    <string>LocationWhenInUseUsageDescription</string>
   
   // 获取appleMusic权限
    <key>NSAppleMusicUsageDescription</key>
    <string>AppleMusicUsageDescription</string>
   
   // 麦克锋使用权限
    <key>NSMicrophoneUsageDescription</key>
    <string>MicrophoneUsageDescription</string>
   
   // 陀螺仪使用权限
    <key>NSMotionUsageDescription</key>
    <string>MotionUsageDescription</string>
   
   // 相册使用权限
    <key>NSPhotoLibraryUsageDescription</key>
    <string>PhotoLibraryUsageDescription</string>
   
   // 提醒权限
    <key>NSRemindersUsageDescription</key>
    <string>RemindersUsageDescription</string>
   
   // Siri 使用权限
    <key>NSSiriUsageDescription</key>
    <string>SiriUsageDescription</string>
   
   // 语音识别权限
    <key>NSSpeechRecognitionUsageDescription</key>
    <string>SpeechRecognitionUsageDescription</string>
   
   // 视频权限
    <key>NSVideoSubscriberAccountUsageDescription</key>
    <string>VideoSubscriberAccountUsageDescription</string>
   
   // 音乐库权限
    <key>kTCCServiceMediaLibrary</key>
    <string>CCServiceMediaLibrary</string>