How App will remember's me Who I am in ios? [closed] - ios

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I have a requirement that. I am using the Login screen in the app. The app shouldn’t even show the login screen once a user has logged in unless the user consciously logs out.
I am new to Objective-C. Can anyone please help me to do this.
Thanks in Advance.
This is my Login Button Code.I don't Know where to do that..
- (IBAction)LoginButton:(id)sender
{
#try
{
email = emailTextField.text;
password=passwordTextField.text;
NSLog(#"The email %# and Password is %# " , emailTextField.text,passwordTextField.text);
if ([ emailTextField.text isEqualToString:#""] || [passwordTextField.text isEqualToString:#""] )
{
UIAlertView *LoginAlert=[[UIAlertView alloc]initWithTitle:#"Fields Empty" message:#"Please Enter the your creadentials" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[LoginAlert show];
}
else
{
NSString *urlString =[NSString stringWithFormat:#"{\"Email\":\"%#\",\"Password\":\"%#\"}",emailTextField.text,passwordTextField.text];
NSLog(#"the post url %#",urlString);
NSString *post = urlString;
NSString *url=[NSString stringWithFormat:#"http://"];
NSLog(#"The whole url %# ", url);
NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"POST"];
NSString *authStr = [NSString stringWithFormat:#"%#:%#", #"", #""];
NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
NSString *authValue = [NSString stringWithFormat:#"Basic %#", [authData base64EncodedStringWithOptions:0]];
NSLog(#"%#",authValue);
[request setValue:authValue forHTTPHeaderField:#"Authorization"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSError *error;
NSHTTPURLResponse *response;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
id json = [NSJSONSerialization JSONObjectWithData:urlData options:0 error:nil];
NSLog(#"json %# ", json);
if ([[json valueForKey:#"Status"] isEqualToString:#"Sucess"])
{
NSString *LoggedPersonID =[json valueForKey:#"PersonID"];
NSLog(#"the logged person ID is %#", LoggedPersonID);
[[NSUserDefaults standardUserDefaults] setObject:LoggedPersonID forKey:#"PersonIDUserDefaults"];
[[NSUserDefaults standardUserDefaults] synchronize];
//[self performSegueWithIdentifier:#"LoginSeque" sender:self];
[self CalculateWeekTwo];
if (_SecondJsonData != nil)
{
[self MyNotificationMethod];
[self performSegueWithIdentifier:#"LoginSeque" sender:self];
}
else
{
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:#"Error in Connection" message:#"Please check your network connectivity" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}
}
else if ([[json valueForKey:#"Status"] isEqualToString:#"Error"] || json == nil)
{
UIAlertView *LoginAlert=[[UIAlertView alloc]initWithTitle:#"Login Failed" message:#"Please make sure you have entered the correct details" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[LoginAlert show];
}
}
//[[NSUserDefaults standardUserDefaults] setObject:#"10940" forKey:#"PersonIDUserDefaults"];
[[NSUserDefaults standardUserDefaults] synchronize];
//emailTextField.text=9416;
}
#catch (NSException *exception)
{
NSLog(#"exception %#", exception);
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:#"Network Error" message:#"Please try later" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}
#finally {
NSLog(#"what do i do here");
}
//[self performSegueWithIdentifier:#"LoginSeque" sender:self];
}

Answer 1

Use NSUserDefault modify your code like this.
[[NSUserDefaults standardUserDefaults] setObject:LoggedPersonID forKey:#"PersonIDUserDefaults"];//after this line add the below code
[[NSUserDefaults standardUserDefaults] setObject:#"YES" forKey:#"isLogIn"];//add this line in your given code
[[NSUserDefaults standardUserDefaults] synchronize];
Now you can add the code given below in application delegate if login is first screen or where ever you are calling your login screen.
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
if ([[defaults valueForKey:#"isLogIn"]isEqualToString:#"YES"]) {
//already login
//also you can access your LoggedPersonID here
}
else{
//call the login view here
}
You can also manage this without adding this isLogIn parameter.
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
if ([defaults valueForKey:#"PersonIDUserDefaults"]==nil) {
//call the login view here
}
else{
//logged in
}

Answer 2

- (IBAction)LoginButton:(id)sender
{
if ([[json valueForKey:#"Status"] isEqualToString:#"Sucess"])
{
// Navigate to login view controller
}
else
{
// Throw error alert
}
}

Answer 3

In my project I have achieved this by using NSCoding. Once user logs in he will remain logged in until he logged out and bypass the login screen.
For this I used two methods in my model class:
- (void) encodeWithCoder : (NSCoder *)encode ;
- (id) initWithCoder : (NSCoder *)decode;
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:_strDOB forKey:#"dob"];
[encoder encodeObject:_strEmail forKey:#"email"];
[encoder encodeObject:_strSName forKey:#"surname"];
}
- (id)initWithCoder:(NSCoder *)decoder{
if((self = [super init])){
_strDOB = [decoder decodeObjectForKey:#"dob"];
_strEmail = [decoder decodeObjectForKey:#"email"];
_strSName = [decoder decodeObjectForKey:#"surname"];
}
return self;
}
Than in your loginView.m:
- (void)saveObject:(Cls *)Obj key:(NSString *)key{
NSData *encodeObject = [NSKeyedArchiver archivedDataWithRootObject:Obj];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:encodeObject forKey:key];
[defaults synchronize];
}
- (Cls *)loadObjectWithKey:(NSString *)key{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *encodedObject = [defaults objectForKey:key];
Cls *Obj = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject];
return Obj;
}
And finally in your login button method using
- (void)saveObject:(Cls *)Obj key:(NSString *)key;
method you can save your login credentials.
And in viewWillAppear method you need to call
- (Cls *)loadObjectWithKey:(NSString *)key;
method to load the object using NSUserDefault.
This will work surely it works for me.
Hope it help.