How I can save value in TextField for showing after closing and opening app?
self.suma.text = [NSString stringWithFormat:#"%d", [self.a1.text intValue]+[self.a2.text intValue]];
I want to do it with "suma".
See documentation for NSUserDefaults.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// Write
[defaults setObject:self.suma.text forKey:#"suma"];
// Read
self.suma.text = [defaults stringForKey:#"suma"];
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Closed 10 years ago.
Possible Duplicate:
How can I reset the NSUserDefaults data in the iPhone simulator?
In my project i am saving some values in NSUserdefaults with different keys.And i have reset button in my app when i click that button values stored in user defaults should remove.Is there any way to delete those values without keys,and is addSuitedNamed: and removeSuitedName can use in this scenario.
NSUserDefaults * myNSUserDefaults = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [myNSUserDefaults dictionaryRepresentation];
for (id key in dict) {
//heck the keys if u need
[myNSUserDefaults removeObjectForKey:key];
}
[myNSUserDefaults synchronize];
or
[NSUserDefaults resetStandardUserDefaults];
[NSUserDefaults standardUserDefaults];
With a selector being called on a button click you can achieve the same using
- (IBAction)btnResetUserDefaultsPressed:(id)sender {
NSUserDefaults* userDefaults = [NSUserDefaults standardUserDefaults];
NSDictionary* dictUserDefaults = [userDefaults dictionaryRepresentation];
for (id akey in dictUserDefaults) {
[userDefaults removeObjectForKey:akey];
}
[userDefaults synchronize];
}
For the second part of your question asked , You would certainly find this useful.
You can reset the values of NSUserDefault using resetStandardUserDefaults.
Check this code:
[NSUserDefaults resetStandardUserDefaults];
[NSUserDefaults standardUserDefaults];
Also you can:
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
Or you can use:
NSUSerDefaults *default = [NSUserDefaults standardUserDefaults];
NSDictionary *dictionary = [default dictionaryRepresentation];
for (NSString *key in [dictionary allKeys])
{
[default removeObjectForKey:key];
}
[default synchronize];
In App delegate, I have following code:
NSUserDefaults *pref = [NSUserDefaults standardUserDefaults];
NSString *alrmTime = #"10:00 AM";
[pref setObject:alrmTime forKey:#"alarmTime"];
[prefs synchronize];
From here I am getting from App delegate User Daeault in Controller A using code
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *tempAlarmTime = [defaults stringForKey:#"alarmTime"];
cell.textLabel.text = [NSString stringWithFormat:#"Remind At %#", tempAlarmTime];
Now, I need to set this userdefault in Controler B , For this m using this:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:mTimeIntervalSTR forKey:#"alarmTime"];
[prefs synchronize];
Now when I need to get this new value in Controller A its coming Null. Why this is happening, and how will I get new set value?
in Controler B use the following to change the userdefault value
NSString *timeString =[[[NSUserDefaults standardUserDefaults] objectForKey:#"alarmTime
"]mutableCopy];
timeString = mTimeIntervalSTR;
[[NSUserDefaults standardUserDefaults]setObject:timeString
forKey:#"alarmTime "];
[[NSUserDefaults standardUserDefaults]synchronize];
After adding a value, call [[NSUserDefaults standardUserDefaults] synchronize];.
I'm trying to create an application, and in that I'm receiving some contents from net and loading into and array, if I quit and run the app again i'm losing the data. How can I store the data in the app itself. Should I use some kind of database? If so which one and how can I implement that? I need to store only some string variables.
EDIT:
My app is tabbar based app, and have two tabs. Loading the arrays in one tab and loading that array in a table in the other VC. once I load the array and move to the second tab, the table is loaded with the array. If i go back and add few more values and then if i check, the added datas is not displayed in the table. And also, when I quit the app the table lose all the values, I need to keep the values in the table, even after i quit the app. How can I do that?
here is my code:
in viewdidload:
NSUserDefaults *simplePlistDb = [NSUserDefaults standardUserDefaults];
[simplePlistDb setBool:YES forKey:#"isItWorking"];
[simplePlistDb setObject:alertList forKey:#"myArray"];
[simplePlistDb synchronize];
in cellforrowatindexpath:-
NSUserDefaults *simplePlistDb = [NSUserDefaults standardUserDefaults];
BOOL flag = [simplePlistDb boolForKey:#"isItWorking"];
if (flag)
{
NSArray *myArray = [simplePlistDb objectForKey:#"myArray"];
for (NSString *str in myArray){
NSLog(#"Str:%#", str);
[loadArray addObject:str];
}
cell.textLabel.text = [loadArray objectAtIndex:indexPath.row];
}
Thank you.
You will want to look into Core Data if you want to save a decent amount of data to the iPhone. However, if not, you can just load the items in the array into a plist and load them from there at launch.
Plist Writing: How to create a new custom property list in iPhone Applications
CoreData: http://www.raywenderlich.com/934/core-data-tutorial-getting-started
Edit--->
As Nekto said, you can also use NSUserDefaults, but I advise mainly using NSUserDefaults for simple NSStrings and integers.
I think for your purposes NSUserDefaults will be enough : NSUserDefaults Class Reference.
Examples:
// save
NSUserDefaults *simplePlistDb = [NSUserDefaults standardUserDefaults];
[simplePlistDb setBool:YES forKey:#"isItWorking"];
[simplePlistDb setObject:[NSArray arrayWithObjects:#"very", #"cool", nil]];
[simplePlistDb synchronize];
// restore
NSUserDefaults *simplePlistDb = [NSUserDefaults standardUserDefaults];
BOOL flag = [simplePlistDb boolForKey:#"isItWorking"];
if (flag)
{
NSArray *myArray = [simplePlistDb objectForKey:#"myArray"];
for (NSString *str in myArray)
NSLog(#"%#", str);
}
You can use NSUserDefaults in order to store your data till the time your app is installed in your device.
How to write in NSuserDefaults:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:#"yourObject1" forKey:#"correspopndingKey1"];
[defaults setObject:#"yourObject2" forKey:#"correspopndingKey2"];
[defaults synchronize];
How to read from NSuserDefaults:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *temp1 = [defaults objectForKey:#"correspopndingKey1"];
NSString *temp2 = [defaults objectForKey:#"correspopndingKey2"];
You can store NSArray in a similar way.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:objArray forKey:#"correspopndingKey"];
[defaults synchronize];
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
I am having unexpected results with my application. I am using a settings bundle, and I want to the default switch to turn on. The switches are off when I start my application. But the sound and the shake are working. I just want the switch to be one when my application loads, and the sound and the shake to be enabled.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Set the application defaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:#"YES" forKey:#"enableSound"];
NSDictionary *appDefaults2 = [NSDictionary dictionaryWithObject:#"YES" forKey:#"enableShake"];
[defaults registerDefaults:appDefaults];
[defaults registerDefaults:appDefaults2];
[defaults synchronize];
return YES;
}
Here is part of the code for the sound button:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
enabledSound = [defaults boolForKey:#"enableSound"];
Here is part of the code where I dectect the shake:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
enabledSound = [defaults boolForKey:#"enableSound"];
enabledShake = [defaults boolForKey:#"enableShake"];
It turns out in the settings bundle, that the Value for OFF and the Value for ON should be removed, and the application worked.