I am creating an app in which I have to create a plist when the app launches for the first time. I'm later going to use the plist to store details a user later inputs. How can I detect the first launch of the app? I was experimenting with NSUserDefaults but I think I'm doing something wrong.
You can do this with NSUserDefaults. But be careful with the Version Number.
Do the following:
NSString *bundleVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleVersionKey];
NSString *appFirstStartOfVersionKey = [NSString stringWithFormat:#"first_start_%#", bundleVersion];
NSNumber *alreadyStartedOnVersion = [[NSUserDefaults standardUserDefaults] objectForKey:appFirstStartOfVersionKey];
if(!alreadyStartedOnVersion || [alreadyStartedOnVersion boolValue] == NO) {
[self firstStartCode];
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES] forKey:appFirstStartOfVersionKey];
}
the selector firstStartCode will only be called on time for each application version on the very first run.
Okay?
I like to use NSUserDefaults to store an indication of the the first run.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:#"firstRun"])
[defaults setObject:[NSDate date] forKey:#"firstRun"];
[[NSUserDefaults standardUserDefaults] synchronize];
You can then test for it later...
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if([defaults objectForKey:#"firstRun"])
{
// do something or not...
}
Taken from: Best way to check if an iPhone app is running for the first time
You can use the following:
-(void) firstLaunch {
//Code goes here
}
-(void) firstLaunchCheck {
if(![[NSUserDefaults standardUserDefaults] boolForKey:#"didLaunchFirstTime"]) {
[[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:#"didLaunchFirstTime"];
[self firstLaunch];
}
}
Related
I need to session. I couldn't find any thing about this issue. Therefore I used appdelegate global variable, but app global variable not save value long time.
I mean, my aim is login page. I don't want user to sign in many time in my app. How can I realize this approach?
save the data in NSUserDefaults,
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:username forKey:#"username"];
[defaults synchronize];
NSString *username=[defaults objectForKey:#"username"] ;
You can use NSUserDefaults for this purpose.
Here's an example for you. Good luck!
- (void) createSession:(NSObject *anyObject) {
//write an object to NSUserDefaults with the key of "session"
[[NSUserDefaults standardUserDefaults] setObject:anyObject forKey:#"session"];
//persist the value in the store
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (NSObject*) getSession {
//get an object from NSUserDefaults with the key of "session"
return [[NSUserDefaults] standardUserDefaults] objectForKey:#"session"];
}
- (void) exampleUsage {
NSObject* mySessionObject = [self getSession];
if (mySessionObject != nil) {
//i have a session
} else {
//i do NOT have a session
}
}
You could check with NSUserDefaults
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
if(![defaults boolForKey:#"login"])
{
/// view to login or signup what ever
}
else
{
/// user already logged in
}
You must use NSUserDefault To Login Window.
NSUserDefaults def=[NSUserDefaults standardUserDefaults];
[def setObject:delegate.txtfield1.text forKey:#"UserName"];
[def setObject:delegate.txtfield2.text forKey:#"Password"];
[def synchronize];
If you want to retrive the NSUSERDefault data used this code.
NSString *UserName=[defaults objectForKey:#"UserName"] ;
NSString *Password=[defaults objectForKey:#"Password"] ;
And For Checking the status
if(![def boolForKey:#"UserName"])
{
}
else
{
}
try this one might be helpful to you......
I'm making an app that changes images every time the user press on the screen. It is using an int to know then to change image.
I need help to save the int value then screen is pressed and load it then the app is loaded.
You could use the NSUserDefaults class for this:
// Write
[[NSUserDefaults standardUserDefaults] setInteger:7615 forKey:#"customIntegerValue"];
[[NSUserDefaults standardUserDefaults] synchronize];
// Read
NSLog(#"Integer = %i", [[NSUserDefaults standardUserDefaults] integerForKey:#"customIntegerValue"];
// To save in pref
int highScore = yourGameScore;
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:highScore] forKey:#"HighScore"];
[[NSUserDefaults standardUserDefaults] synchronize];
// To get saved value from pref
highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:#"HighScore"] intValue ];
You can see similar post here: stackOldPost
You can save values in NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
Im developing a reminder app.
So my client want to set a rate this application popup message, that'll come up on the 10th time user open the app.is this possible.
How can i implement this?
Can anyone help me please.Thanks in advance
You could use NSUserDefaults for this:
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];
NSInteger appLaunchAmounts = [userDefaults integerForKey:#"LaunchAmounts"];
if (appLaunchAmounts == 10)
{
[self showMessage];
}
[userDefaults setInteger:appLaunchAmounts+1 forKey:#"LaunchAmounts"];
You can store that into the NSUserDefaults. Just update it in applicationDidFinishLaunching:.
You can save an integer in NSUserDefaults
- (void)setInteger:(NSInteger)value forKey:(NSString *)defaultName
Retrieve it and increment it every time the appDidFinishLaunching (or appWillEnterForeground) delegate methods is called. Probably best to use appWillEnterForeground as sometimes apps can lie in the background unterminated for days.
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSInteger count = [defaults integerForKey:#"LaunchCount"];
count++;
/* Do checks and review prompt */
[defaults setInteger:count forKey:#"LaunchCount"];
[defaults synchronize];
This will store a value in NSUserDefaults called 'AppLaunchCount'.
- (BOOL)application:(UIApplication *)app didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if ([[NSUserDefaults standardUserDefaults] integerForKey:#"AppLaunchCount"])
{
[[NSUserDefaults standardUserDefaults] setInteger:([[NSUserDefaults standardUserDefaults] integerForKey:#"AppLaunchCount"] + 1) forKey:#"AppLaunchCount"];
}
else
{
[[NSUserDefaults standardUserDefaults] setInteger:1 forKey:#"AppLaunchCount"];
}
}
I've saved some input from a UITextField using the following code:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:myTextField.text forKey:#"myTextFieldKey"];
[defaults synchronize];
I'd like to display this saved text on a UILabel in another view controller.
I tried this:
myLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:#"myTextFieldKey"];
but nothing displays. Any help with this would be great. thanks.
Well the loading and saving code is correct, so it looks like the problem is something else.
Try this to debug:
NSString *aValue = [[NSUserDefaults standardUserDefaults] objectForKey:#"myTextFieldKey"];
NSLog(#"Value from standardUserDefaults: %#", aValue);
NSLog(#"Label: %#", myLabel);
myLabel.text = aValue;
Now you will see if the value retriever from the NSUserDefaults is set and if the label is assinged.
[[NSUserDefaults standardUserDefaults] setValue:myTextField.text forKey:#"myTextFieldKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
After that use valueForKey not objectForKey:
myLabel.text = [[NSUserDefaults standardUserDefaults] valueForKey:#"myTextFieldKey"];
Try:
myLabel.text = [[NSUserDefaults standardUserDefaults] stringForKey:#"myTextFieldKey"];
Check that myTextField and myLabel aren't nil.
when i enter a value in the iphone simulator and press the save button it only keeps the value until the simulator is running. and when i restart the simulator and press the load button it shows an earlier value entered by me.i.e, it is not able to keep the new value and keeps only old value.
i am using following loops for saving a file and loading a file.
-(IBAction) save{
NSUserDefaults *sinner=[NSUserDefaults standardUserDefaults];
[sinner setObject:serverIP.text forKey:#"load"];
NSUserDefaults *king=[NSUserDefaults standardUserDefaults];
[king setObject:noc.text forKey:#"save"];
}
-(IBAction) load {
NSUserDefaults *sinner=[NSUserDefaults standardUserDefaults];
NSString *tempstring =[sinner stringForKey:#"load"];
serverIP.text = [NSString stringWithFormat:tempstring];
NSUserDefaults *king=[NSUserDefaults standardUserDefaults];
NSString *tempstring1 =[king stringForKey:#"save"];
noc.text = [NSString stringWithFormat:tempstring1];
}
// Your code
NSUserDefaults *king= [NSUserDefaults standardUserDefaults];
[king setObject:bookmarks forKey:#"Bookmarks"];
// saving it all
[king synchronize];
-(IBAction) save{
NSUserDefaults *sinner=[NSUserDefaults standardUserDefaults];
[sinner setObject:serverIP.text forKey:#"load"];
[sinner setObject:noc.text forKey:#"save"];
[sinner synchronize];
}
This should save the contents. You dont need two separate userdefaults. To load them you can try
-(IBAction) load {
NSUserDefaults *sinner=[NSUserDefaults standardUserDefaults];
NSString *tempstring =[sinner stringForKey:#"load"];
serverIP.text = tempstring;
NSString *tempstring1 =[sinner stringForKey:#"save"];
noc.text = tempstring1;
}
Hope this helps