RCTKeyboardAvoiding.m

// Simplest possible wrapper around IHKeyboardAvoiding.
//
// I don't really know how to Xcode, but I got it to work by:
//
//   1. Checking out the IHKeyboardAvoiding repository.
//         https://github.com/IdleHandsApps/IHKeyboardAvoiding
//
//   2. Dragging the Files IHKeyboardAvoiding.{h,m} into my project.
//
//   3. Ensuring that both .m files are in the "Compile Sources" phase of the target.
//
// Then, in JavaScript:
//
//   var KeyboardAvoiding = require("react-native").NativeModules.KeyboardAvoiding
//
//   ...
//      componentDidMount: function() {
//        /* If you're unlucky, try using a timeout? */
//        KeyboardAvoiding.avoid(React.findNodeHandle(this.refs.view))
//      },
//      componentWillUnmount: function() {
//        KeyboardAvoiding.stopAvoiding()
//      }
//
// I'm a lazy person and only bothered with the simplest API.

#import <Foundation/Foundation.h>

#import "IHKeyboardAvoiding.h"
#import "RCTBridgeModule.h"
#import "RCTBridge.h"
#import "RCTUIManager.h"
#import "RCTView.h"
#import "RCTSparseArray.h"

@interface RCTKeyboardAvoiding : NSObject <RCTBridgeModule>
@end

@implementation RCTKeyboardAvoiding

@synthesize bridge = _bridge;

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue {
  return _bridge.uiManager.methodQueue;
}

RCT_EXPORT_METHOD(avoid:(nonnull NSNumber*) tag)
{
  [_bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
    RCTView *view = tag == nil ? nil : viewRegistry[tag];
    RCTLogInfo(@"Avoiding %@ (%@)", tag, view);
    [IHKeyboardAvoiding setKeyboardAvoidingMode: KeyboardAvoidingModeMaximum];
    if (view)
      [IHKeyboardAvoiding setAvoidingView: view];
  }];
}

RCT_EXPORT_METHOD(stopAvoiding)
{
  [_bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
    [IHKeyboardAvoiding removeAll];
  }];
}

@end