Gracias @rmaddy, agregué esto justo después de otros pares clave-cadena en Info.plist y solucioné el problema:
<key>NSPhotoLibraryUsageDescription</key>
<string>Photo Library Access Warning</string>
Editar:
También terminé teniendo problemas similares en diferentes componentes de mi aplicación. Terminé agregando todas estas claves hasta ahora (después de actualizar a Xcode8 / iOS10):
<key>NSPhotoLibraryUsageDescription</key>
<string>This app requires access to the photo library.</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app does not require access to the microphone.</string>
<key>NSCameraUsageDescription</key>
<string>This app requires access to the camera.</string>
Consulte este enlace developer.apple.com para obtener una lista completa de referencias clave de la lista de propiedades.
Lista llena:
Apple Music:
<key>NSAppleMusicUsageDescription</key>
<string>My description about why I need this capability</string>
Bluetooth:
<key>NSBluetoothPeripheralUsageDescription</key>
<string>My description about why I need this capability</string>
Calendario:
<key>NSCalendarsUsageDescription</key>
<string>My description about why I need this capability</string>
Cámara:
<key>NSCameraUsageDescription</key>
<string>My description about why I need this capability</string>
Contactos:
<key>NSContactsUsageDescription</key>
<string>My description about why I need this capability</string>
FaceID:
<key>NSFaceIDUsageDescription</key>
<string>My description about why I need this capability</string>
Cuota de salud:
<key>NSHealthShareUsageDescription</key>
<string>My description about why I need this capability</string>
Actualización de salud:
<key>NSHealthUpdateUsageDescription</key>
<string>My description about why I need this capability</string>
Kit para el hogar:
<key>NSHomeKitUsageDescription</key>
<string>My description about why I need this capability</string>
Ubicación:
<key>NSLocationUsageDescription</key>
<string>My description about why I need this capability</string>
Ubicación (siempre):
<key>NSLocationAlwaysUsageDescription</key>
<string>My description about why I need this capability</string>
Ubicación (cuando está en uso):
<key>NSLocationWhenInUseUsageDescription</key>
<string>My description about why I need this capability</string>
Micrófono:
<key>NSMicrophoneUsageDescription</key>
<string>My description about why I need this capability</string>
Movimiento (acelerómetro):
<key>NSMotionUsageDescription</key>
<string>My description about why I need this capability</string>
NFC (comunicación de campo cercano):
<key>NFCReaderUsageDescription</key>
<string>My description about why I need this capability</string>
Librería fotográfica:
<key>NSPhotoLibraryUsageDescription</key>
<string>My description about why I need this capability</string>
Biblioteca de fotos (acceso de solo escritura):
<key>NSPhotoLibraryAddUsageDescription</key>
<string>My description about why I need this capability</string>
Recordatorios:
<key>NSRemindersUsageDescription</key>
<string>My description about why I need this capability</string>
Siri
<key>NSSiriUsageDescription</key>
<string>My description about why I need this capability</string>
Reconocimiento de voz:
<key>NSSpeechRecognitionUsageDescription</key>
<string>My description about why I need this capability</string>
NSPhotoLibraryUsageDescription
y encontrará muchos ejemplos.