当我想要使用＆＃34; next＆＃34;时，我不太确定最好的方法或适当的SDK调用。或＆＃34;之前＆＃34;分页结果分页时由图表api返回的URL。我已经查看了FBRequest和FBRequestConnection的文档，但是没有任何方法或调用可以作为我问题的明显解决方案。任何人都有一个或可以提出一个能指出正确方向的建议吗？
答案 0 :(得分：8)
要获得下一个链接，您必须这样做：
我用这种方式解决了这个问题：
添加标题
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>
和代码
//use this general method with any parameters you want. All requests will be handled correctly
- (void)makeFBRequestToPath:(NSString *)aPath withParameters:(NSDictionary *)parameters success:(void (^)(NSArray *))success failure:(void (^)(NSError *))failure
{
//create array to store results of multiple requests
NSMutableArray *recievedDataStorage = [NSMutableArray new];
//run requests with array to store results in
[self p_requestFriendsFromPath:aPath
parameters:parameters
storage:recievedDataStorage
succes:success
failure:failure];
}
- (void)p_requestFromPath:(NSString *)path parameters:(NSDictionary *)params storage:(NSMutableArray *)friends succes:(void (^)(NSArray *))success failure:(void (^)(NSError *))failure
{
//create requests with needed parameters
FBSDKGraphRequest *fbRequest = [[FBSDKGraphRequest alloc]initWithGraphPath:path
parameters:params
HTTPMethod:nil];
//then make a Facebook connection
FBSDKGraphRequestConnection *connection = [FBSDKGraphRequestConnection new];
[connection addRequest:fbRequest
completionHandler:^(FBSDKGraphRequestConnection *connection, NSDictionary*result, NSError *error) {
//if error pass it in a failure block and exit out of method
if (error){
if(failure){
failure(error);
}
return ;
}
//add recieved data to array
[friends addObjectsFromArray:result[@"data"];
//then get parameters of link for the next page of data
NSDictionary *paramsOfNextPage = [FBSDKUtility dictionaryWithQueryString:result[@"paging"][@"next"]];
if (paramsOfNextPage.allKeys.count > 0){
[self p_requestFromPath:path
parameters:paramsOfNextPage
storage:friends
succes:success
failure:failure];
//just exit out of the method body if next link was found
return;
}
if (success){
success([friends copy]);
}
}];
//do not forget to run connection
[connection start];
}
使用方法：
获取好友列表使用技巧如下：
//For example retrieve friends list with limit of retrieving data items per request equal to 5
NSDictionary *anyParametersYouWant = @{@"limit":@5};
[self makeFBRequestToPath:@"me/taggable_friends/"
withParameters:anyParametersYouWant
success:^(NSArray *results) {
NSLog(@"Found friends are:\n%@",results);
}
failure:^[(NSError *) {
NSLog(@"Oops! Something went wrong(\n%@",error);
}];
];
答案 1 :(得分：8)
尼古拉的解决方案非常完美。这是它的Swift版本
func makeFBRequestToPath(aPath:String, withParameters:Dictionary<String, AnyObject>, success successBlock: (Array<AnyObject>?) -> (), failure failureBlock: (NSError?) -> ())
{
//create array to store results of multiple requests
let recievedDataStorage:Array<AnyObject> = Array<AnyObject>()
//run requests with array to store results in
p_requestFromPath(aPath, parameters: withParameters, storage: recievedDataStorage, success: successBlock, failure: failureBlock)
}
func p_requestFromPath(path:String, parameters params:Dictionary<String, AnyObject>, var storage friends:Array<AnyObject>, success successBlock: (Array<AnyObject>?) -> (), failure failureBlock: (NSError?) -> ())
{
//create requests with needed parameters
let req = FBSDKGraphRequest(graphPath: path, parameters: params, tokenString: FBSDKAccessToken.currentAccessToken().tokenString, version: nil, HTTPMethod: "GET")
req.startWithCompletionHandler({ (connection, result, error : NSError!) -> Void in
if(error == nil)
{
print("result \(result)")
let result:Dictionary<String, AnyObject> = result as! Dictionary<String, AnyObject>
//add recieved data to array
friends.append(result["data"]!)
//then get parameters of link for the next page of data
let nextCursor:String? = result["paging"]!["next"]! as? String
if let _ = nextCursor
{
let paramsOfNextPage:Dictionary = FBSDKUtility.dictionaryWithQueryString(nextCursor!)
if paramsOfNextPage.keys.count > 0
{
self.p_requestFromPath(path, parameters: paramsOfNextPage as! Dictionary<String, AnyObject>, storage: friends, success:successBlock, failure: failureBlock)
//just exit out of the method body if next link was found
return
}
}
successBlock(friends)
}
else
{
//if error pass it in a failure block and exit out of method
print("error \(error)")
failureBlock(error)
}
})
}
func getFBFriendsList()
{
//For example retrieve friends list with limit of retrieving data items per request equal to 5
let anyParametersYouWant:Dictionary = ["limit":2]
makeFBRequestToPath("/me/friends/", withParameters: anyParametersYouWant, success: { (results:Array<AnyObject>?) -> () in
print("Found friends are: \(results)")
}) { (error:NSError?) -> () in
print("Oops! Something went wrong \(error)")
}
}
答案 2 :(得分：3)
所以在我寻找一个明显的答案时，我偶然发现了github.com上的Facebook iOS SDK源代码，发现了这个类：https://github.com/facebook/facebook-ios-sdk/blob/master/src/Network/FBGraphObjectPagingLoader.m。
在＆＃34; - (void)followNextLink＆＃34;方法我找到了我的解决方案：
FBRequest *request = [[FBRequest alloc] initWithSession:self.session
graphPath:nil];
FBRequestConnection *connection = [[FBRequestConnection alloc] init];
[connection addRequest:request completionHandler:
^(FBRequestConnection *innerConnection, id result, NSError *error) {
_isResultFromCache = _isResultFromCache || innerConnection.isResultFromCache;
[innerConnection retain];
self.connection = nil;
[self requestCompleted:innerConnection result:result error:error];
[innerConnection release];
}];
// Override the URL using the one passed back in 'next'.
NSURL *url = [NSURL URLWithString:self.nextLink];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
connection.urlRequest = urlRequest;
self.nextLink = nil;
self.connection = connection;
[self.connection startWithCacheIdentity:self.cacheIdentity
skipRoundtripIfCached:self.skipRoundtripIfCached];
上面有很多我不需要的代码，所以我能够（在SO OP的帮助下）将其浓缩为：
/* make the API call */
FBRequest *request = [[FBRequest alloc] initWithSession:FBSession.activeSession graphPath:nil];
FBRequestConnection *connection = [[FBRequestConnection alloc] init];
[connection addRequest:request completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] initWithDictionary:@{@"friends": [result objectForKey:@"data"], @"paging": [result objectForKey:@"paging"]}];
NSLog(@"%@", dictionary);
block(dictionary, error);
}];
// Override the URL using the one passed back in 'next|previous'.
NSURL *url = [NSURL URLWithString:paginationUrl];
NSMutableURLRequest* urlRequest = [NSMutableURLRequest requestWithURL:url];
connection.urlRequest = urlRequest;
[connection start];
为了帮助可能需要更通用方法的其他人，我已将我的大部分Facebook API图表调用编入@ https://gist.github.com/tamitutor/c65c262d8343d433cf7f找到的要点。