iOS - Eezy Tutorials

Getting the Shared NSUserDefaults Instance

+ standardUserDefaults

Returns the shared defaults object.

Example

 NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];		
	

+ resetStandardUserDefaults

Synchronizes any changes made to the shared user defaults object and releases it from memory.

Example

[NSUserDefaults resetStandardUserDefaults];
		

Initializing an NSUserDefaults Object

- init

Returns an NSUserDefaults object initialized with the defaults for the current user account.

Example

NSUserDefaults *userDefaults = [[NSUserDefaults alloc]init];
		

Registering Defaults

- registerDefaults:

Adds the contents of the specified dictionary to the registration domain.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults registerDefaults:@{@"User": @"Raj"}];
 NSLog(@"%@",[userDefaults objectForKey:@"User"]);
		

Output

2014-04-16 08:19:11.310 iOS-Tutorial[2688:a0b] Raj
		

Getting Default Values

- arrayForKey:

Returns the array associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@[@"Eezy", @"Tut"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults arrayForKey:@"iOS"]);
		

Output

2014-04-16 08:21:02.083 iOS-Tutorial[2706:a0b] (
    Eezy,
    Tut
)
		

- boolForKey:

Returns the Boolean value associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:YES forKey:@"iOS"];
NSLog(@"%d",[userDefaults boolForKey:@"iOS"]);
		

Output

2014-04-16 08:22:29.958 iOS-Tutorial[2719:a0b] 1
		

- dataForKey:

Returns the data object associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:[@"Eezy" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"iOS"];
NSLog(@"%@",[userDefaults dataForKey:@"iOS"]);
		

Output

2014-04-16 08:30:11.560 iOS-Tutorial[2744:a0b] <45657a79>
		

- dictionaryForKey:

Returns the dictionary object associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@{@"Eezy" : @"Website"} forKey:@"iOS"];
NSLog(@"%@",[userDefaults dictionaryForKey:@"iOS"]);
		

Output

2014-04-16 08:31:16.297 iOS-Tutorial[2774:a0b] {
    Eezy = Website;
}		

- floatForKey:

Returns the floating-point value associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setFloat:12.3 forKey:@"iOS"];
NSLog(@"%f",[userDefaults floatForKey:@"iOS"]);
		

Output

2014-04-16 08:31:59.136 iOS-Tutorial[2784:a0b] 12.300000
		

- integerForKey:

Returns the integer value associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:12 forKey:@"iOS"];
NSLog(@"%d",[userDefaults integerForKey:@"iOS"]);
		

Output

2014-04-16 08:33:25.364 iOS-Tutorial[2796:a0b] 12
		

- objectForKey:

Returns the object associated with the first occurrence of the specified default.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@[@"Eezy", @"Tut"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults arrayForKey:@"iOS"]);
		

Output

2014-04-16 08:21:02.083 iOS-Tutorial[2706:a0b] (
    Eezy,
    Tut
)
		

- stringArrayForKey:

Returns the array of strings associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@[@"Eezy",@"Tuts"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults stringArrayForKey:@"iOS"]);		
	

Output

2014-04-16 08:37:55.046 iOS-Tutorial[2841:a0b] (
    Eezy,
    Tuts
)
		

- stringForKey:

Returns the string associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@"Eezy"forKey:@"iOS"];
NSLog(@"%@",[userDefaults stringForKey:@"iOS"]);
		

Output

2014-04-16 08:38:31.790 iOS-Tutorial[2866:a0b] Eezy
		

- doubleForKey:

Returns the double value associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setDouble:12.5 forKey:@"iOS"];
NSLog(@"%f",[userDefaults doubleForKey:@"iOS"]);
		

Output

2014-04-16 08:34:31.684 iOS-Tutorial[2809:a0b] 12.500000
		

- URLForKey:

Returns the NSURL instance associated with the specified key.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setURL:[NSURL URLWithString:@"http://ios.eezytutorials.com"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults URLForKey:@"iOS"]);
		

Output

2014-04-16 08:36:34.433 iOS-Tutorial[2824:a0b] http://ios.eezytutorials.com
		

Setting Default Values

- setBool:forKey:

Sets the value of the specified default key to the specified Boolean value.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:YES forKey:@"iOS"];
NSLog(@"%d",[userDefaults boolForKey:@"iOS"]);
		

Output

2014-04-16 08:22:29.958 iOS-Tutorial[2719:a0b] 1
		

- setFloat:forKey:

Sets the value of the specified default key to the specified floating-point value.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setFloat:12.3 forKey:@"iOS"];
NSLog(@"%f",[userDefaults floatForKey:@"iOS"]);
		

Output

2014-04-16 08:31:59.136 iOS-Tutorial[2784:a0b] 12.300000
		

- setInteger:forKey:

Sets the value of the specified default key to the specified integer value.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:12 forKey:@"iOS"];
NSLog(@"%d",[userDefaults integerForKey:@"iOS"]);
		

Output

2014-04-16 08:33:25.364 iOS-Tutorial[2796:a0b] 12
		

- setObject:forKey:

Sets the value of the specified default key in the standard application domain.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@[@"Eezy", @"Tut"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults arrayForKey:@"iOS"]);
		

Output

2014-04-16 08:21:02.083 iOS-Tutorial[2706:a0b] (
    Eezy,
    Tut
)
		

- setDouble:forKey:

Sets the value of the specified default key to the double value.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setDouble:12.5 forKey:@"iOS"];
NSLog(@"%f",[userDefaults doubleForKey:@"iOS"]);
		

Output

2014-04-16 08:34:31.684 iOS-Tutorial[2809:a0b] 12.500000
		

- setURL:forKey:

Sets the value of the specified default key to the specified URL.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setURL:[NSURL URLWithString:@"http://ios.eezytutorials.com"] forKey:@"iOS"];
NSLog(@"%@",[userDefaults URLForKey:@"iOS"]);		

Output

2014-04-16 08:36:34.433 iOS-Tutorial[2824:a0b] http://ios.eezytutorials.com
		

Removing Defaults

- removeObjectForKey:

Removes the value of the specified default key in the standard application domain.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@"Eezy"forKey:@"iOS"];
[userDefaults removeObjectForKey:@"iOS"];
NSLog(@"%@",[userDefaults stringForKey:@"iOS"]);
		

Output

2014-04-16 08:39:12.559 iOS-Tutorial[2876:a0b] (null)
		

Maintaining Persistent Domains

- synchronize

Writes any modifications to the persistent domains to disk and updates all unmodified persistent domains to what is on disk.

Example

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:@"Eezy"forKey:@"iOS"];
NSLog(@"%d",[userDefaults synchronize]);
		

Output

2014-04-16 08:40:10.188 iOS-Tutorial[2900:a0b] 1
		

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