Say for example if I have two buttons one for apples and one for orange, and I select apples and takes me to the apples screen. How can I make it for now on every time I run the app it will go to the apples screen?
in viewDidLoad
if([[NSUserDefaults standardUserDefaults] objectForKey:#"fruit"] != nil)
{
if ([[[NSUserDefaults standardUserDefaults] objectForKey:#"fruit"]isEqualToString:#"apple"]) {
[self.navigationController pushViewController:appleVC animated:NO];
}
else{
[self.navigationController pushViewController:orangeVC animated:NO];
}
}
and on Button Methods
on Apple button
[[NSUserDefaults standardUserDefaults] setObject:#"apple" forKey:#"fruit"];
on Orange button
[[NSUserDefaults standardUserDefaults] setObject:#"orange" forKey:#"fruit"];
You can store information like this using NSUserDefaults.
You'd store a boolean bAppleSelected like this:
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
[standardUserDefaults setBool:bAppleSelected forKey=#"appleSelected"];
You can read it by accessing the default userDefaults:
BOOL bApple = [standardUserDefaults boolForKey=#"appleSelected"];
On your app delegate you must have some method that instantiates the very first controller and displays it in a window. You can just create an "apples controller" and push it there
You can use NSUserdefaults here,
NSString* fruit=#"apple";
[[NSUserDefaults standardUserDefaults]setObject:fruit forKey:#"controllerName"];
[[NSUserDefaults standardUserDefaults]synchronize];
and insted of the name string of your firstview controller in appdelegate file use the above NSUserDefaults.
Related
I have an storyboard with three view controllers, the init view with a button Init, the login view controller and the list view controller. When I click in the button init in the first view controller, I would like to verify whether the user logged in in order to switch to the login view or to the list view. How could I implement this using segues (segue conditionals??)
You could do something like this
BOOL isLoggedIn = [[NSUserDefaults standardUserDefaults] boolForKey:#"isLoggedIn"];
NSString *headingStoryboardID = isLoggedIn ? #"YourAlreadyLoggedInVC_ID" : #"YourLoginVC_ID";
if([headingStoryboardID isEqualToString:#"YourAlreadyLoggedInVC_ID"]) {
AlreadyLoggedInClass *vc1 = (AlreadyLoggedInClass *)[self.storyboard instantiateViewControllerWithIdentifier:#"YourAlreadyLoggedInVC_ID"];
[self presentViewController:vc2 animated:YES completion:nil];
} else {
LoginViewController *vc2 = (LoginViewController *)[self.storyboard instantiateViewControllerWithIdentifier:#"YourLoginVC_ID"];
[self presentViewController:vc2 animated:YES completion:nil];
}
OBS: Ugly and uncompiled code but hope the concept gets across.
EDIT DUE TO COMMENT
To perform a push segue you call
[self.navigationController pushViewController:vc1 animated:YES];
instead.
You can Store your login value in user default when user login like this
in LOginViewController
-(void) doLogin
{
NSString * str = #"Loged In";
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:str forKey:#"login"];
[defaults synchronize];
}
And in first view controller check whether this NSdefault value is nil or not.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *userLogIn = [defaults objectForKey:#"login"];
if (userLogIn.length !=0) {
//then user Loged in
}else
{
//then user not Loged in
}
This code is just example you can change it acording to your need.
I would like to display an alertview when a user opens the app for the first time. After they open the app, they click on a button that pushes a table view on the navigation controller stack. If it's the first time the table view has ever been opened, there should be an alert view that displays telling the user that they can click the cell to edit.
How can I achieve this?
Thanks
Simply, use NSUserDefaults.
something like:
// the place where you want to check if this is the first run:
BOOL didRunBefore = [[NSUserDefaults standardUserDefaults] boolForKey:#"didRunBefore"];
if (!didRunBefore) {
// show alert;
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"didRunBefore"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
When your user taps on your button you should check for some value in [NSUserDefaults standardDefatults] if the check is nil you should display your alert and then save some value, so the next time you check for it, it would have some value stored and you do nothing.
Like this:
NSString * val = [[NSUserDefaults standardUserDefaults] objectForKey:#"kFirstTime"];
if (!val) {
//show alert
[[NSUserDefaults standardUserDefaults] setObject:#"1" forKey:#"kFirstTime"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
//Your code
I have a settings view in my app that will give the user the option of one of the Tabs showing either a feed of mp3s from a podcast or mov from a podcast. I set it up on the first time running the app to display an AlertView asking what they prefer. I do that with this in the applicationDidFinishLaunching:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (! [defaults boolForKey:#"notFirstRun"]) {
UIAlertView *firstrun = [[UIAlertView alloc] initWithTitle:#"Sermon Preference" message:#"Do you prefer audio only, or video sermons? (This setting can be changed at any time in the Settings Page.)" delegate:self cancelButtonTitle:nil otherButtonTitles:#"Audio", #"Video", nil];
[firstrun show];
[firstrun release];
[defaults setBool:YES forKey:#"notFirstRun"];
}
Then I set this in the AppDelegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *nope = #"Audio";
[defaults setObject:nope forKey:#"videosermons"];
[defaults synchronize];
}
if (buttonIndex == 1) {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *yup = #"Video";
[defaults setObject:yup forKey:#"videosermons"];
[defaults synchronize]; }
}
On the Root View (Which is the audio listing of sermons) of the Navigation Controller for sermons I set this in viewWillAppear:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *currently = [defaults objectForKey:#"videosermons"];
if ([currently isEqualToString:#"Video"]) {
self.videoView = [[[VideoPodcastTableView alloc] initWithNibName:#"VideoPodcastTableView" bundle:[NSBundle mainBundle]] autorelease];
[self.navigationController pushViewController:_videoView animated:NO]; }
if ([currently isEqualToString:#"Audio"]) {
}
I also set up a Settings Tab with a segmentControl to reflect what has been selected. This is the issue:
If I click on Video in the firstRun popup, and then go straight to the Sermons tab, it stays on Audio Sermons. I can then navigate to the Settings Tab and it will show Video selected. Now, without selecting anything, I can go once more to the Sermons tab, and it will now go to the Video Sermons. Why is it that it is not getting the message to change until after I go to the settings?
The problem is that you're already loading your root view before the UIAlertView clickedButtonAtIndex: selector is called. After you launch your UIAlertView in your AppDelegate, your application continues loading your root view in the background.
viewWillAppear will have already run by the time a UIAlertView option has been selected.
To solve this, I'd recommend having another root view as your initial view. If you're using storyboards, have one segue going to a view controller that launches your alert view, and another segue going to your tab page. On first launch, segue to the alert view page, and otherwise segue to the tab page. This way your NSUserDefaults #"videosermons" key can be set before the tab view is loaded.
I have Edited whole Question
What is the difference between presenting the ModelView Controller and dismissing the modal view controller in following situation??
HomeView
TableItemSelection View
PickerView
In HomeView
I am writing code in viewWillAppear to fetch values from NSUserDefault that is set from TableView. Below is my code for viewDidLoad (for initial values) and viewWillAppear(when new value from tableview)
- (void)viewDidLoad
{
[super viewDidLoad];
actionMinutes = #"0";
actionSeconds = #"0";
restMinutes = #"0";
restSeconds = #"0";
}
- (void) viewWillAppear:(BOOL)animated
{
actionMin = [actionMinutes intValue];
actionSec = [actionSeconds intValue];
restMin = [restMinutes intValue];
restSec = [restSeconds intValue];
NSLog(#"acMin:%d acSec:%d reMin:%d reSec:%d",actionMin,actionSec,restMin,restSec);
}
In TableItemSelection View
I am presenting this view from HomeView. Now i want to set value of NSString in HomeView based on Table's didSelectRowAtIndex Method. I am using NSUserDefault to set the value.
And with Done Button touch i am presenting HomeView. (Actually I have to dismissModalViewController) But when i use dismiss I am not able to get values in NSString of HomeView. I am getting values of the table from PickerView. (I am instructed to do that). Below is my code for Table view on DONE button touch
HomeView *homeView = [[HomeView alloc] init];
[homeView.view setBackgroundColor:[UIColor clearColor]];
[homeView.view setFrame:CGRectMake(0 ,40, 320, 460)];
homeView.actionMinutes = [[NSUserDefaults standardUserDefaults] valueForKey:#"actionMinute"];
homeView.actionSeconds = [[NSUserDefaults standardUserDefaults] valueForKey:#"actionSecond"];
homeView.restMinutes = [[NSUserDefaults standardUserDefaults] valueForKey:#"restMinute"];
homeView.restSeconds = [[NSUserDefaults standardUserDefaults] valueForKey:#"restSecond"];
homeView.song = [[NSUserDefaults standardUserDefaults] valueForKey:#"songstring"];
NSLog(#"%#",homeView.actionMinutes);
[self presentModalViewController:homeView animated:YES];
//[self dismissModalViewControllerAnimated:YES]; // if this method is used then no values are passed to HomeView
[homeView release];
In PickerView
I am fetching the values from pickerview and then store it in UserDefault.
below is my code for pickerview
NSUserDefaults *actionTime = [NSUserDefaults standardUserDefaults];
[actionTime setValue:min forKey:#"actionMinute"];
[actionTime setValue:sec forKey:#"actionSecond"];
So why exactly i am not able to get UserDefault values when dismissing ModelView.??? Does presenting a new view everytime will make a stack of views???
#DShah: Yes most definitely..!!
You need to dismiss every modal view.
Also Please post the code you are using.
Also keep in mind that you need to put the NSUserDefaults line first (the line which you use assign NSString value to NSUserDefaults) and then put the line where in you dismissModalViewControllerAnimated:.
If you require more help please leave me a comment.
Hope this helps you.
I think you are trying to store integer value in NSUserDefaults then you have to
Use setInteger:forKey: instead of setObject:forKey:. An integer is not an object, it's a primitive type.
To retrieve it use integerForKey:.
This is the final answer through which i am able to solve my problem
Here is a code on Done button touch event...
- (IBAction) btnDonePressed:(id)sender {
aurioTouchAppDelegate *appDelegate = (aurioTouchAppDelegate *) [[UIApplication sharedApplication] delegate];
appDelegate.homeView.actionMinutes = [[NSUserDefaults standardUserDefaults] valueForKey:#"actionMinute"];
appDelegate.homeView.actionSeconds = [[NSUserDefaults standardUserDefaults] valueForKey:#"actionSecond"];
appDelegate.homeView.restMinutes = [[NSUserDefaults standardUserDefaults] valueForKey:#"restMinute"];
appDelegate.homeView.restSeconds = [[NSUserDefaults standardUserDefaults] valueForKey:#"restSecond"];
// [self presentModalViewController:homeView animated:YES];
[self dismissModalViewControllerAnimated:YES]; // if this method is used then no values are passed to HomeView
}
I'm new to programming and I have an app that has a login view on start up and request the user to enter their name which is used throughout out the program. Once they enter their name and log in they are presented with the main menu view. Their name is saved using NSUserdefaults.
The idea is that they will only have to login once (or again if they logout) so they should only see the login view the first time they run the app however once the app is started again it still shows the login screen and also you have to press the login button twice before you are taken to the main menu.
I know that the app is storing the details because it is used thought the app but I cant work out why. Here is my code. If someone could help it would be greatly appreciated.
-(IBAction)LogInButton:(id)sender
{
NSString *tempStr = [[NSUserDefaults standardUserDefaults] objectForKey:#"UserName"];
if(tempStr.length==0)
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:Name.text forKey:#"UserName"];
[prefs synchronize];
LogInView *Logview = [[LogInView alloc] initWithNibName:#"LogInView" bundle:nil];
[self presentModalViewController:Logview animated:YES];
}
else
{
MainMenuView *mainview = [[MainMenuView alloc] initWithNibName:#"MainMenuView" bundle:nil];
[self presentModalViewController:mainview animated:YES];
}
}
Judging by your description what you want is
On viewDidLoad check to see if the user is logged in
If YES show the MainMenu
If NO show the LogInView
The code may look like this
- (void)viewDidLoad
{
[super viewDidLoad];
[self showCorrectController];
}
The show correct controller method could look like this
- (void)showCorrectController
{
UIViewController *viewController = nil;
if ([self isLoggedIn]) {
viewController = [[MainMenuView alloc] init];
} else {
viewController = [[LogInView alloc] init];
}
[self presentModalViewController:viewController animated:YES];
[viewController release]; viewController = nil;
}
A convenience method is called isLoggedIn which looks like this
- (BOOL)isLoggedIn
{
// The double negation just means we get a boolean response
return !![[NSUserDefaults standardUserDefaults] objectForKey:#"UserName"];
}
Now edit your original method to something like this
-(IBAction)LogInButton:(id)sender
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:Name.text forKey:#"UserName"];
[prefs synchronize];
[self showCorrectController];
}
There are quite a few things that could be done to tidy this up a lot but this should be a start to get you going.
A word of caution on your naming of things. The convention is to start method and variable names with lowercased letters. Classes and constants start with uppercase letters.
It looks like the first time in:
The login screen shows up
The user presses login (and this method you're showing gets called)
The saved value isn't initially set, so this evaluates to true: if(tempStr.length==0)
You save the new value
You display another login screen
But I don't think you're showing all the code. What runs when the app launches?