iOS 检索 valueForKey？

Question

我是 iOS 的新手，正在开发一个基本的应用程序，它目前正在使用 SSKeychain 和 AFNetworking 与 API 进行交互。当您使用我检索的应用程序登录并在我的 CredentialStore 类中设置 auth_token 时，我需要将 auth token 作为 http header 发送到 API 以获得访问权限。如何检索存储在 HomeViewController 的 CredentialStore 类中的 token 。

这是我的 CredentialStore:

#import "GFCredentialStore.h"
#import "SSKeychain.h"

#define SERVICE_NAME @"Groupify"
#define AUTH_TOKEN_KEY @"auth_token"

@implementation GFCredentialStore : NSObject

- (BOOL)isLoggedIn {
    return [self authToken] != nil;
}

- (void)clearSavedCredentials {
    [self setAuthToken:nil];
}

- (NSString *)authToken {
    return [self secureValueForKey:AUTH_TOKEN_KEY];
}

- (void)setAuthToken:(NSString *)authToken {
    [self setSecureValue:authToken forKey:AUTH_TOKEN_KEY];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"token-changed" object:self];
}

- (void)setSecureValue:(NSString *)value forKey:(NSString *)key {
    if (value) {
        [SSKeychain setPassword:value
                     forService:SERVICE_NAME
                        account:key];
    } else {
        [SSKeychain deletePasswordForService:SERVICE_NAME account:key];
    }
}

- (NSString *)secureValueForKey:(NSString *)key {
    return [SSKeychain passwordForService:SERVICE_NAME account:key];
}

@end

这里我尝试检索 authToken 值并将其设置为字符串，以便我可以将其作为 http header 发送:

#import "GFHomeViewController.h"
#import <AFNetworking.h>
#import "GFCredentialStore.h"

#define kBaseURL "http://localhost:3000/"
#define kHomeURL "newsfeed.json"

@interface GFHomeViewController ()
@end

@implementation GFHomeViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];


    __weak typeof(self)weakSelf = self;

    NSString *urlString = [NSString stringWithFormat:@"%s%s", kBaseURL, kHomeURL];

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    [manager.requestSerializer setValue: forHTTPHeaderField:@"auth_token"];

    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"JSON: %@", responseObject);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];

}

Answer 1

假设 SSKeychain 正在保存钥匙串(keychain)并向/从钥匙串(keychain)返回值，我认为您可以简单地执行类似的操作

GFCredentialStore *credentialStore = [[CGCredentialStore alloc] init];

if ([credentialStore isLoggedIn]) {
    NSString *authToken = [credentialStore authToken];
    [manager.requestSerializer setValue:authToken forHTTPHeaderField:@"auth_token"];
} else {
    // prompt/display controller for login
}

如果我遗漏了您遇到的问题/问题中的某些内容，请澄清您的问题，我会再次尝试解决。