AppDelegate.m file
#import <FBSDKLoginKit/FBSDKLoginKit.h>
#import <FBSDKCoreKit/FBSDKCoreKit.h>
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
return [[FBSDKApplicationDelegate sharedInstance]
application:application openURL:url
sourceApplication:sourceApplication
annotation:annotation];
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
[FBSDKAppEvents activateApp];
}
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:
(NSDictionary *)launchOptions {
return [[FBSDKApplicationDelegate sharedInstance]
application:application didFinishLaunchingWithOptions:launchOptions];
==>Login ViewController.m
-(IBAction)facebookLogin:(id)sender
{
FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
if ([FBSDKAccessToken currentAccessToken])
{
NSLog(@"Token is available : %@",
[[FBSDKAccessToken currentAccessToken]tokenString]);
[self fetchUserInfo];
}
else
{
[login logInWithReadPermissions:@[@"email"] fromViewController:
self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
{
if (error)
{
NSLog(@"Login process error");
}
else if (result.isCancelled)
{
NSLog(@"User cancelled login");
}
else
{
NSLog(@"Login Success");
if ([result.grantedPermissions containsObject:@"email"])
{
NSLog(@"result is:%@",result);
[self fetchUserInfo];
}
else
{
[SVProgressHUD showErrorWithStatus:@"Facebook email permission error"];
}
}
}];
}
}
-(void)fetchUserInfo
{
if ([FBSDKAccessToken currentAccessToken])
{
NSLog(@"Token is available : %@",
[[FBSDKAccessToken currentAccessToken]tokenString]);
[[[FBSDKGraphRequest alloc] initWithGraphPath:
@"me" parameters:@{@"fields": @"id, name, email"}]
startWithCompletionHandler:
^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
if (!error)
{
NSLog(@"results:%@",result);
NSString *email = [result objectForKey:@"email"];
NSString *userId = [result objectForKey:@"id"];
if (email.length >0 )
{
//Start you app Todo
}
else
{
NSLog(@“Facebook email is not verified");
}
}
else
{
NSLog(@"Error %@",error);
}
}];
}
}