facebook login in objective c

facebookLogin.m

// add the following code in to info.plist
<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>fb1801381186770425</string>
        </array>
    </dict>
</array>
<key>FacebookAppID</key>
<string>AddYourID</string>
<key>FacebookDisplayName</key>
<string>YourAppName</string>
<key>LSApplicationQueriesSchemes</key>
<array>
    <string>fbapi</string>
    <string>fb-messenger-api</string>
    <string>fbauth2</string>
    <string>fbshareextension</string>
    <string>instagram</string>
</array>
<key>NSLocationWhenInUseUsageDescription</key>
<string>To access your current location</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>To share </string>
  
  // add the following code in to appdelegate.m
  #import "LoginViewController.h"
#import <FBSDKCoreKit/FBSDKCoreKit.h>
  
  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    
    [[FBSDKApplicationDelegate sharedInstance] application:application
                             didFinishLaunchingWithOptions:launchOptions];
    return YES;
}
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    
    BOOL handled = [[FBSDKApplicationDelegate sharedInstance] application:application
                                                                  openURL:url
                                                        sourceApplication:sourceApplication
                                                               annotation:annotation
                    ];
    // Add any custom logic here.
    return handled;
}

// call the following code into  header
// change the header button type to fbsdklogin button type

// call the following function into view controller

#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>

-(void)faceBookLogin{
    
    FBSDKLoginManager *loginManager = [[FBSDKLoginManager alloc] init];
    [loginManager logInWithReadPermissions:@[@"public_profile", @"email"] fromViewController:self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
        //TODO: process error or result.
        if (error) {
            NSLog(@"Process error");
            [self facebookLoginFailed:YES];
        } else if (result.isCancelled) {
            [self facebookLoginFailed:NO];
        } else {
            NSLog(@"working");
            if ([FBSDKAccessToken currentAccessToken]) {
                NSLog(@"Token is available : %@",[[FBSDKAccessToken currentAccessToken]tokenString]);
                NSMutableDictionary* parameters = [NSMutableDictionary dictionary];
                [parameters setValue:@"id,name,email,first_name,last_name,picture.type(large)" forKey:@"fields"];
                [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:parameters]
                 startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, NSDictionary* result, NSError *error) {
                     if (!error) {
                         NSLog(@"working");
                         NSLog(@"%@",result);
                        
                     }
                 }];
            }
            else {
                [self facebookLoginFailed:YES];
            }
        }
    }];
}
- (void)facebookLoginFailed:(BOOL)isFBResponce{
    if(isFBResponce){
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:NSLocalizedString(@"Failed", nil) message:NSLocalizedString(@"request_error", nil) delegate:self cancelButtonTitle:NSLocalizedString(@"pop_ok", nil) otherButtonTitles: nil];
        [alert show];
    }
    else{
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:NSLocalizedString(@"Failed", nil) message:NSLocalizedString(@"loginfb_cancelled", nil) delegate:self cancelButtonTitle:NSLocalizedString(@"pop_ok", nil) otherButtonTitles: nil];
        [alert show];
    }
}




@property (weak, nonatomic) IBOutlet FBSDKLoginButton *FbloginBtn1;