Invoking the Sync Down Method with a Custom Target | Mobile SDK Development Guide

Pass an instance of your custom SFSyncDownTarget class to the SFMobileSyncSyncManager sync down method:

Swift

1func syncDown(target: SyncDownTarget, 
2            soupName: String, 
3            onUpdate: ()) -> SyncState

Objective-C

1- (SFSyncState*) 
2    syncDownWithTarget:(SFSyncDownTarget*)target 
3              soupName:(NSString*)soupName 
4           updateBlock:
5              (SFSyncSyncManagerUpdateBlock)updateBlock;

Pass an instance of your custom SyncDownTarget class to the SyncManager sync down method:

1SyncState syncDown(SyncDownTarget target, SyncOptions options, String soupName, SyncUpdateCallback callback);

Create a target object with the following property settings:
- Set type to "custom".
- Set at least one of the following properties:
  
  iOS (if supported):
  
  Set iOSImpl to the name of your iOS custom class.
  
  Android (if supported):
  
  Set androidImpl to the package-qualified name of your Android custom class.
The following example supports both iOS and Android:
1var target = 2{type:"custom", 3 androidImpl: 4 "com.salesforce.samples.notesync.ContentSoqlSyncDownTarget", 5 iOSImpl:"SFContentSoqlSyncDownTarget", 6 … 7};

Pass this target to the hybrid sync down method:

1cordova.require("com.salesforce.plugin.MobileSync").syncDown(target, …);