Add command to set date on RCTDatePickerManager

Summary: We are moving away from setNativeProps, this adds necessary method on native to leverage commands API

Reviewed By: shergin

Differential Revision: D17787877

fbshipit-source-id: 8f06cdd85c96bce4ea9bb7a8cd5f6c1a1d68b20a

Author: sammy-SC

React/Views/RCTDatePickerManager.m

@@ -11,6 +11,7 @@
 #import "RCTDatePicker.h"
 #import "RCTEventDispatcher.h"
 #import "UIView+React.h"
+#import <React/RCTUIManager.h>
 
 @implementation RCTConvert(UIDatePicker)
 
@@ -41,4 +42,22 @@ - (UIView *)view
 RCT_REMAP_VIEW_PROPERTY(mode, datePickerMode, UIDatePickerMode)
 RCT_REMAP_VIEW_PROPERTY(timeZoneOffsetInMinutes, timeZone, NSTimeZone)
 
+RCT_EXPORT_METHOD(setNativeDate : (nonnull NSNumber *)viewTag toDate : (NSDate *)date)
+{
+  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, NSDictionary<NSNumber *, UIView *> *viewRegistry) {
+    UIView *view = viewRegistry[viewTag];
+    
+    if ([view isKindOfClass:[RCTDatePicker class]]) {
+      [(RCTDatePicker *)view setDate:date];
+    } else {
+      UIView *subview = view.subviews.firstObject;
+      if ([subview isKindOfClass:[RCTDatePicker class]]) {
+        [(RCTDatePicker *)subview setDate:date];
+      } else {
+        RCTLogError(@"view type must be RCTPicker");
+      }
+    }
+  }];
+}
+
 @end