Question

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

来源

#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

问题是导入时它没有显示在NativeModules中。它返回undefined。我想念什么？我使用RCT_EXPORT_MODULE()进行导出，并且使用requiresMainQueueSetup禁止警告Module RCTImageLoader requires main queue setup since it overrides init but doesn't implement requiresMainQueueSetup . In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of的警告。我一直在搜索，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..

感谢您的帮助！

Answer 1

只需确保您的文件位于iOS文件夹中即可。尝试使一个简单的导出模块起作用，然后根据需要对其进行修改。

在修改iOS本机文件后，请不要忘记使用xCode或控制台进行重新构建。

一个简单的导出本机模块应如下所示（根据RN文档）：

require('common')

然后尝试将其导入您的RN代码：

// 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

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

您的项目树可能看起来像：

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

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

如果在本机模块中，则通常应更新这些模块。

如果警告与您的代码有关，则必须按如下所示修改模块：

对于Swift：

requiresMainQueueSetup

对于目标C：

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

只需根据模块需要设置返回值即可。通常，如果您的模块不与UI交互，则NO便足够。

在NativeModules中找不到模块

标题

来源

1 个答案: