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我正在尝试使用本机代码在 react-native (0.53.3) 中实现 iCloudStorage。现在我有以下内容：

标题

#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>

@interface iCloudStorage : RCTEventEmitter <RCTBridgeModule>

@end

资源

#import "iCloudStorage.h"
#import <React/RCTEventDispatcher.h>

static NSString* const ICLOUDSTORAGE_PREFIX = @"@com.manicakes.iCloudStorage/";
static NSString* const ICLOUD_STORE_CHANGED = @"ICLOUD_STORE_CHANGED";
static NSString* const kStoreChangedEvent = @"iCloudStoreDidChangeRemotely";
static NSString* const kChangedKeys = @"changedKeys";

@implementation iCloudStorage
RCT_EXPORT_MODULE()


+ (NSString*)appendPrefixToKey:(NSString*)key {
  return [NSString stringWithFormat:@"%@%@", ICLOUDSTORAGE_PREFIX, key];
}

+ (NSString*)removePrefixFromKey:(NSString*)key {
  if (![key hasPrefix:ICLOUDSTORAGE_PREFIX]) {
    return nil;
  }
  return [key substringFromIndex:[ICLOUDSTORAGE_PREFIX length]];
}

+ (NSDictionary*)storeDictionary {
  NSUbiquitousKeyValueStore* store = [NSUbiquitousKeyValueStore defaultStore];
  return [store dictionaryRepresentation];
}

+ (NSArray*)allKeysInStore {
  return [[iCloudStorage storeDictionary] allKeys];
}

+ (id) getObjectForKey:(NSString*)key {
  return [[NSUbiquitousKeyValueStore defaultStore] objectForKey:[iCloudStorage appendPrefixToKey:key]];
}

+ (void) setValue:(NSString*)value forKey:(NSString*)key {
  [[NSUbiquitousKeyValueStore defaultStore] setObject:value forKey:[iCloudStorage appendPrefixToKey:key]];
  [[NSUbiquitousKeyValueStore defaultStore] synchronize];
}

+ (void) removeKey:(NSString*)key {
  [[NSUbiquitousKeyValueStore defaultStore] removeObjectForKey:[iCloudStorage appendPrefixToKey:key]];
  [[NSUbiquitousKeyValueStore defaultStore] synchronize];
}

+ (NSString*) getMergedItemWithKey:(NSString*)key value:(NSString*)value rejecter:(RCTPromiseRejectBlock)reject {
  NSDictionary* storedItem = @{};
  NSDictionary* newItem = @{};
  NSString* storedString = [iCloudStorage getObjectForKey:key];

  if (storedString != nil) {
    NSError* error = nil;
    id object = [NSJSONSerialization JSONObjectWithData:[storedString dataUsingEncoding:NSUTF8StringEncoding]
                                                options:0
                                                  error:&error];
    if (error != nil) {
      reject(@"json_decode_err", @"Error parsing stored value as JSON string.", error);
      return nil;
    }

    if (![object isKindOfClass:[NSDictionary class]]) {
      reject(@"json_not_object_err", @"The stored JSON string does not parse into an object.", nil);
      return nil;
    }

    if (value != nil) {
      id newObject = [NSJSONSerialization JSONObjectWithData:[value dataUsingEncoding:NSUTF8StringEncoding]
                                                     options:0
                                                       error:&error];
      if (error != nil) {
        reject(@"json_decode_err", @"The provided value is not valid JSON.", error);
        return nil;
      }

      if (![newItem isKindOfClass:[NSDictionary class]]) {
        reject(@"json_not_object_err", @"The provided JSON string does not parse into an object.", nil);
        return nil;
      }

      newItem = newObject;
    }

    storedItem = object;
  }

  NSMutableDictionary* mergedItem = [NSMutableDictionary dictionaryWithDictionary:storedItem];
  [mergedItem addEntriesFromDictionary:newItem];

  NSError* error = nil;
  NSData* data = [NSJSONSerialization dataWithJSONObject:mergedItem options:0 error:&error];
  if (error != nil) {
    reject(@"json_encode_err", @"Error encoding the merged JSON data to string.", error);
    return nil;
  }

  return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

- (instancetype)init {
  self = [super init];

  if (self) {
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(ubiquitousStoreUpdated:)
                                                 name:NSUbiquitousKeyValueStoreDidChangeExternallyNotification
                                               object:nil];
    [[NSUbiquitousKeyValueStore defaultStore] synchronize];
  }

  return self;
}

- (NSArray<NSString *> *)supportedEvents {
  return @[ kStoreChangedEvent ];
}

- (void) ubiquitousStoreUpdated:(NSNotification*)notification {
  // if this notification comes in before bridge has initialized,
  // don't try to send the event (app crashes if you do).
  if (!self.bridge) {
    return;
  }

  NSArray* changedKeys = [[notification userInfo] objectForKey:NSUbiquitousKeyValueStoreChangedKeysKey];
  NSMutableArray* reportedChangedKeys = [NSMutableArray array];
  for (NSString* key in changedKeys) {
    NSString* reportedKey = [iCloudStorage removePrefixFromKey:key];
    if (reportedKey) {
      [reportedChangedKeys addObject:reportedKey];
    }
  }

  if ([reportedChangedKeys count]) {
    NSDictionary* body = @{ kChangedKeys : reportedChangedKeys };
    [self sendEventWithName:kStoreChangedEvent body:body];
  }
}

RCT_EXPORT_METHOD(getItem: (NSString*)key resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  resolve([iCloudStorage getObjectForKey:key]);
}

RCT_EXPORT_METHOD(setItem: (NSString*)key value: (NSString*)value resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  [iCloudStorage setValue:value forKey:key];
  resolve(@{});
}

RCT_EXPORT_METHOD(removeItem: (NSString*)key resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  [iCloudStorage removeKey:key];
  resolve(@{});
}

RCT_EXPORT_METHOD(mergeItem: (NSString*)key value: (NSString*)value resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  NSString* newValue = [iCloudStorage getMergedItemWithKey:key value:value rejecter:reject];
  if (newValue == nil) {
    // we failed and reject block was called.
    return;
  }

  [iCloudStorage setValue:newValue forKey:key];

  resolve(@{});
}

RCT_REMAP_METHOD(clear, clearResolver:(RCTPromiseResolveBlock)resolve
                 rejecter:(RCTPromiseRejectBlock)reject) {
  for (NSString* key in [iCloudStorage allKeysInStore]) {
    if ([key hasPrefix:ICLOUDSTORAGE_PREFIX]) {
      [[NSUbiquitousKeyValueStore defaultStore] removeObjectForKey:key];
    }
  }

  resolve(@{});
}

RCT_REMAP_METHOD(getAllKeys, getAllKeysResolver:(RCTPromiseResolveBlock)resolve
                 rejecter:(RCTPromiseRejectBlock)reject) {
  NSMutableArray* allKeys = [NSMutableArray array];

  for (NSString* storeKey in [iCloudStorage allKeysInStore]) {
    NSString* key = [iCloudStorage removePrefixFromKey:storeKey];
    if (key != nil) {
      [allKeys addObject:key];
    }
  }

  resolve(allKeys);
}

RCT_EXPORT_METHOD(multiGet: (NSArray*)keys resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  NSMutableArray *result = [NSMutableArray arrayWithCapacity:[keys count]];
  for (NSString* key in keys) {
    NSObject* object = [iCloudStorage getObjectForKey:key];
    if (object != nil) {
      [result addObject:object];
    }
  }

  resolve(result);
}

RCT_EXPORT_METHOD(multiSet: (NSDictionary*)keyValuePairs resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  for (NSString* key in [keyValuePairs allKeys]) {
    [iCloudStorage setValue:[keyValuePairs objectForKey:key] forKey:key];
  }
  resolve(@{});
}

RCT_EXPORT_METHOD(multiRemove: (NSArray*)keys resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  for (NSString* key in keys) {
    [iCloudStorage removeKey:key];
  }

  resolve(@{});
}

RCT_EXPORT_METHOD(multiMerge: (NSDictionary*)keyValuePairs resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
  NSMutableDictionary* result = [NSMutableDictionary dictionaryWithCapacity:[keyValuePairs count]];
  BOOL failed = NO;
  for (NSString* key in [keyValuePairs allKeys]) {
    NSString* newValue = [iCloudStorage getMergedItemWithKey:key value:[keyValuePairs objectForKey:key] rejecter:reject];
    if (newValue == nil) {
      break;
    }
  }

  if (failed) {
    return;
  }

  for (NSString* key in [result allKeys]) {
    [iCloudStorage setValue:[result objectForKey:key] forKey:key];
  }

  resolve(@{});
}

- (NSDictionary<NSString *,id> *)constantsToExport {
  return @{ ICLOUD_STORE_CHANGED : kStoreChangedEvent };
}

+ (BOOL)requiresMainQueueSetup {
  return TRUE;
}

@end

问题是它没有显示在NativeModules我导入它的时候。它返回undefined。我错过了什么？我RCT_EXPORT_MODULE()用来导出它，我可以requiresMainQueueSetup抑制警告Module RCTImageLoader requires main queue setup since it overridesinit but doesn't implementrequiresMainQueueSetup . In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of。我一直在寻找，但在任何地方都找不到答案。我已将文件添加到以项目命名的文件夹中：

<projectfolder>
  --<projectName>
    iCloudStorage.h
    iCloudStorage.m
  --libraries
  --etc..

谢谢您的帮助！

4

1 回答 1

1

只需确保您的文件位于 iOS 文件夹中。尝试使一个简单的导出模块工作，然后根据您的需要进行修改。

修改 iOS 原生文件后不要忘记使用 xCode 或控制台重新构建。

一个简单的导出本机模块应该如下所示（根据 RN 文档）：

// CalendarManager.h
#import <React/RCTBridgeModule.h>

@interface CalendarManager : NSObject <RCTBridgeModule>
@end

// CalendarManager.m
#import "CalendarManager.h"

@implementation CalendarManager

// To export a module named CalendarManager
RCT_EXPORT_MODULE();

// This would name the module AwesomeCalendarManager instead
// RCT_EXPORT_MODULE(AwesomeCalendarManager);

@end

然后尝试在您的 RN 代码中导入它：

import {NativeModules} from 'react-native';
var CalendarManager = NativeModules.CalendarManager;

来源： https ://facebook.github.io/react-native/docs/native-modules-ios

您的项目树应该如下所示：

<projectfolder>
  --<projectName>
      --<ios>
         iCloudStorage.h
         iCloudStorage.m
      --<android>
      --JS libraries
      --JS files etc

关于requiresMainQueueSetup警告：

如果它在本机模块中，通常更新这些模块应该可以工作。

如果警告与您的代码有关，您将必须修改您的模块，如下所示：

对于斯威夫特：

@objc(MyModule)
class MyModule: NSObject {
  // ADD the 3 lines from below:
  @objc static func requiresMainQueueSetup() -> Bool {
    return false
  }

对于目标 C：

+ (BOOL)requiresMainQueueSetup
{
    return NO;
}

只需根据您的模块需要设置返回值即可。如果您的模块不与 UI 交互，通常一个 NO 就足够了。

于 2018-10-11T08:53:21.553 回答