系統權限

• 在訪問相機、相冊等，需在info.plist里配置上請求權限的描述信息
  舉個栗子：
  <key>NSCameraUsageDescription</key>
  <string>描述信息</string>
  下面列出所有的key，用到的自行添加吧。
  NSBluetoothPeripheralUsageDescription
  NSCalendarsUsageDescription
  NSCameraUsageDescription
  NSContactsUsageDescription
  NSHealthShareUsageDescription
  NSHealthUpdateUsageDescription
  NSHomeKitUsageDescription
  NSLocationAlwaysUsageDescription
  NSLocationWhenInUseUsageDescription
  NSMicrophoneUsageDescription
  NSMotionUsageDescription
  NSPhotoLibraryUsageDescription
  NSRemindersUsageDescription
  NSSiriUsageDescription
  NSSpeechRecognitionUsageDescription
  NSVideoSubscriberAccountUsageDescription
  NSVoIPUsageDescription

App跳轉設置

  openUrl:
  openURL: options: completionHandler:
  prefs:root=某項服務

若要跳轉系統設置，需先再URL type中添加一個prefs值，如下圖：

設置 url types.png

• iOS <= iOS7 , 只能跳轉到 系統設置頁面
  NSURL *url= [NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"];
  if ([[UIApplication sharedApplication] canOpenURL:url]) {
  [[UIApplication sharedApplication] openURL:url];
  }

• iOS >= iOS8 && <= iOS9 ，支持跳轉到設置界面及設置內層界面
  可以使用UIApplicationOpenSettingsURLString跳轉到當前app設置

• iOS >= iOS10，支持跳轉到自己應用設置，不支持跳轉到系統設置
  NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
  UIApplication *application = [UIApplication sharedApplication];
  if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
  [application openURL:url options:@{} completionHandler:^(BOOL success) {
  if (completion) { completion(success); }
  }];
  }
  options可選值：UIApplicationOpenURLOptionUniversalLinksOnly。
  Value為布爾值，默認為False，如果Value為True，那么只有安裝了Link所對應的App的情況下才能打開這個Universal Link，而不是通過啟動Safari方式打開這個Link的代表的網站。
  [[UIApplication sharedApplication] openURL:URL options:@{UIApplicationOpenURLOptionUniversalLinksOnly:@YES} completionHandler:nil];

• iOS >= iOS8 可以這樣
  - (void)openUrl:(NSString *)urlStr completiongHandler:(void (^ __nullable)(BOOL success))completion {
  NSURL *url = [NSURL URLWithString:urlStr];
  UIApplication *application = [UIApplication sharedApplication];
  if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
  [application openURL:url options:@{} completionHandler:^(BOOL success) {
  if (completion) { completion(success); }
  }];
  }
  else {
  BOOL success = false;
  if ([application canOpenURL:url]) {
  success = [application openURL:url];
  }
  if (completion) { completion(success); }
  }
  }
  調用
  // NSString *urlStr = @"prefs:root=Phone";
  NSString *urlStr = UIApplicationOpenSettingsURLString;
  [self openUrl:urlStr completiongHandler:^(BOOL success) {
  if (!success) {
  // 跳轉失敗
  }else {
  // 跳轉成功
  }
  }];

• 以下列出一些系統設置的URL
  蜂窩網絡：prefs:root=MOBILE_DATA_SETTINGS_ID
  VPN — prefs:root=General&path=Network/VPN
  Wi-Fi：prefs:root=WIFI
  定位服務：prefs:root=LOCATION_SERVICES
  個人熱點：prefs:root=INTERNET_TETHERING
  關于本機：prefs:root=General&path=About
  輔助功能：prefs:root=General&path=ACCESSIBILITY
  飛行模式：prefs:root=AIRPLANE_MODE
  鎖定：prefs:root=General&path=AUTOLOCK
  亮度：prefs:root=Brightness
  藍牙：prefs:root=General&path=Bluetooth
  時間設置：prefs:root=General&path=DATE_AND_TIME
  FaceTime：prefs:root=FACETIME
  設置：prefs:root=General
  鍵盤設置：prefs:root=General&path=Keyboard
  iCloud：prefs:root=CASTLE
  iCloud備份：prefs:root=CASTLE&path=STORAGE_AND_BACKUP
  語言：prefs:root=General&path=INTERNATIONAL
  定位：prefs:root=LOCATION_SERVICES
  音樂：prefs:root=MUSIC
  Music Equalizer — prefs:root=MUSIC&path=EQ
  Music Volume Limit — prefs:root=MUSIC&path=VolumeLimit
  Network — prefs:root=General&path=Network
  Nike + iPod — prefs:root=NIKE_PLUS_IPOD
  Notes — prefs:root=NOTES
  Notification — prefs:root=NOTIFICATIONS_ID
  Phone — prefs:root=Phone
  Photos — prefs:root=Photos
  Profile — prefs:root=General&path=ManagedConfigurationList
  Reset — prefs:root=General&path=Reset
  Safari — prefs:root=Safari
  Siri — prefs:root=General&path=Assistant
  Sounds — prefs:root=Sounds
  Software Update — prefs:root=General&path=SOFTWARE_UPDATE_LINK
  Store — prefs:root=STORE
  Twitter — prefs:root=TWITTER
  Usage — prefs:root=General&path=USAGE
  Wallpaper — prefs:root=Wallpaper