我对FB SDK和iOS开发很新。我试图将FBGraphUser对象传递给app委托，然后在另一个视图中使用它。我的应用程序正确连接到FB，然后在logginview中将FBGraphUser对象分配给appDelegate。现在的问题是，当我转到另一个视图时，它将再次检索它。
有谁知道为什么不工作？
我在loginViewController.h中的代码是
- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
user:(id<FBGraphUser>)user {
// here we use helper properties of FBGraphUser to dot-through to first_name and
// id properties of the json response from the server; alternatively we could use
// NSDictionary methods such as objectForKey to get values from the my json object
;
// setting the profileID property of the FBProfilePictureView instance
// causes the control to fetch and display the profile picture for the user
_loggedInUser = user;
[self saveFBuserToDB];
_appDelegate.loggedInUser = (id<FBGraphUser>) user;
// NSLog(@"%@",_appDelegate.loggedInUser);
}
直到这里它就像一个魅力。它连接到FB，当我执行NSLOG时，它会从应用程序委托中检索对象....
现在......当我进入另一个视图时，用户不再被设置
createExercisePopupViewController.h
#import <UIKit/UIKit.h>
#import "myGymAppDelegate.h"
@interface createExercisePopupViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
{
NSArray* routineName;
}
@property (retain,nonatomic) NSArray* routineName;
@property (strong,nonatomic) myGymAppDelegate *appDelegate;
和createExercisePopupViewController.h
#import "createExercisePopupViewController.h"
@interface createExercisePopupViewController ()
{
NSManagedObjectContext *context;
}
@end
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_appDelegate=(myGymAppDelegate*)[[UIApplication sharedApplication] delegate];
NSLog(@"%@",_appDelegate.loggedInUser);
}
SOLUTION：
虽然@Borinschi Ivan给出的答案是有效的
我发现另外一项工作不再使用app委托来重新审视fbgraph用户并在我所有其他视图中使用此方法。这将在每个其他视图中设置fb用户图包含viewdidload中的[self fbConnect]
- (void) fbConnect {
if (FBSession.activeSession.isOpen) {
[[FBRequest requestForMe] startWithCompletionHandler:
^(FBRequestConnection *connection,
NSDictionary<FBGraphUser> *user,
NSError *error) {
if (!error) {
_loggedInUser = user;
}
}];
}
}
答案 0 :(得分：2)
我用一个我编写的单例类完成了这个....
// HEADER
//
// imoFacebookSingletone.h
// PeopleInc
//
// Created by Borinschi Ivan on 2/17/13.
// Copyright (c) 2013 Borinschi Ivan. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <FacebookSDK/FacebookSDK.h>
#import "AppDelegate.h"
@interface imoFacebookSingletone : NSObject
+ (imoFacebookSingletone*)facebookUser;
@property (nonatomic,retain) NSString *userFullName;
@property (nonatomic,retain) NSString *userFirstName;
@property (nonatomic,retain) NSString *userLastName;
@property (nonatomic,retain) NSString *userId;
@property (nonatomic,assign) BOOL userLoged;
- (void)logIn;
- (void)logOut;
@end
//实施
//
// imoFacebookSingletone.m
// PeopleInc
//
// Created by Borinschi Ivan on 2/17/13.
// Copyright (c) 2013 Borinschi Ivan. All rights reserved.
//
#import "imoFacebookSingletone.h"
#import <FacebookSDK/FacebookSDK.h>
@implementation imoFacebookSingletone
+ (imoFacebookSingletone*)facebookUser
{
static imoFacebookSingletone *facebookUser = nil;
if (!facebookUser) { facebookUser = [[super allocWithZone:nil] init]; }
return facebookUser;
}
+(id)allocWithZone:(NSZone *)zone { return [self facebookUser]; }
- (id)init {
self = [super init];
if (self) { self.userLoged = NO; }
return self;
}
- (void)logOut {
[FBSession.activeSession closeAndClearTokenInformation];
}
-(void)logIn
{
if (!self.userLoged) {
[FBSession openActiveSessionWithReadPermissions:nil allowLoginUI:YES completionHandler: ^(FBSession *session, FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}
else { [[NSNotificationCenter defaultCenter] postNotificationName:@"populateUserDetails" object:self]; }
}
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error {
switch (state) {
case FBSessionStateOpen: { [self populateUserDetails]; }
break;
case FBSessionStateClosed: { [self cleanUsser]; }
break;
case FBSessionStateClosedLoginFailed:
{
[FBSession.activeSession closeAndClearTokenInformation];
[self cleanUsser];
}
break;
default: { }
break;
}
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:@"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alertView show];
}
}
- (void)populateUserDetails {
if (FBSession.activeSession.isOpen) { [[FBRequest requestForMe] startWithCompletionHandler: ^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
if (!error)
{
self.userFirstName = user.first_name;
self.userLastName = user.last_name;
self.userFullName = user.name;
self.userId = user.id;
[[NSNotificationCenter defaultCenter] postNotificationName:@"populateUserDetails" object:self];
}
}];
}
}
- (void)cleanUsser
{
self.userFirstName = @"";
self.userLastName = @"";
self.userFullName = @"";
self.userId = @"";
self.userLoged = NO;
}
@end
//示例使用
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
return [FBSession.activeSession handleOpenURL:url];
}
#import <UIKit/UIKit.h>
#import "imoFacebookSingletone.h"
@interface ViewController : UIViewController<FBLoginViewDelegate>
{
}
@property (strong, nonatomic) FBRequest *pendingRequest;
@property (strong, nonatomic) imoFacebookSingletone *facebook;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
self.facebook = [[imoFacebookSingletone alloc] init];
if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded)
{
[self.facebook logIn];
}
else
{
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(populateUserDetails:) name:@"populateUserDetails" object:nil];
}
- (void)populateUserDetails:(NSNotification *)notification
{
userName.text = self.facebook.userFullName;
userPicture.profileID = self.facebook.userId;
}