save and load uiswitch - ios

Question

I'm trying to make an appointment form on the iPad and I'm having trouble with the UISwitch, I need to save its state and the later load it on another page, I have done this for a text field and a date picker but for some reason it doesn't work for the UISwitch. I am very new to this so any help would be appreciated.
-(IBAction)savedata:(id)sender; {
NSString *savestring = _NameofResident.text;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:savestring forKey:#"savedstring"];
[defaults synchronize];
NSString *savestring1 = _NameofStudent.text;
NSUserDefaults *defaults1 = [NSUserDefaults standardUserDefaults];
[defaults1 setObject:savestring1 forKey:#"savedstring1"];
[defaults synchronize];
NSString *savestring2 = _AppointmentTime.date;
NSUserDefaults *defaults2 = [NSUserDefaults standardUserDefaults];
[defaults2 setObject:savestring2 forKey:#"savedstring2"];
[defaults synchronize];
NSString *savestring3 = _NextAppointmentTime.date;
NSUserDefaults *defaults3 = [NSUserDefaults standardUserDefaults];
[defaults3 setObject:savestring3 forKey:#"savedstring3"];
[defaults synchronize];
NSString *savestring4 = _Confirmed.text;
NSUserDefaults *defaults4 = [NSUserDefaults standardUserDefaults];
[defaults4 setObject:savestring4 forKey:#"savedstring4"];
[defaults synchronize];
}
- (IBAction)loaddata:(id)sender; {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *loadstring = [defaults objectForKey:#"savedstring"];
[_NameofResident setText:loadstring];
NSString *loadstring1 = [defaults objectForKey:#"savedstring1"];
[_NameofStudent setText:loadstring1];
NSString *loadstring2 = [defaults objectForKey:#"savedstring2"];
[_AppointmentTime setDate:loadstring2];
NSString *loadstring3 = [defaults objectForKey:#"savedstring3"];
[_NextAppointmentTime setDate:loadstring3];
NSString *loadstring4 = [defaults objectForKey:#"savedstring4"];
[_Confirmed setText:loadstring4];
}
As you can see I can both load and save the state for the names and times but I don't really know how I can add in a UISwitch to do this.
thanks for your help.

Answer 1

To store the value of a UISwitch state, which is a BOOL, you can do 2 things :
store the BOOL in an NSNumber ([NSNumber numberWithBool:myBool]) and save it with defaults setObject: method. But then, when retrieving the BOOL, you will have to do [defaults objectForKey:#"myKey"].boolValue
store the BOOL itself with defaults setBool:forKey method. And retrieve it with defaults boolForKey method.
Moreover, I've seen you get the defaults many times and synchronize it many times. This is not necessary so I give you an example of what you could have done :
-(IBAction)savedata:(id)sender; {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *savestring = _NameofResident.text;
[defaults setObject:savestring forKey:#"savedstring"];
NSString *savestring1 = _NameofStudent.text;
[defaults setObject:savestring1 forKey:#"savedstring1"];
NSString *savestring2 = _AppointmentTime.date;
[defaults setObject:savestring2 forKey:#"savedstring2"];
NSString *savestring3 = _NextAppointmentTime.date;
[defaults setObject:savestring3 forKey:#"savedstring3"];
NSString *savestring4 = _Confirmed.text;
[defaults setObject:savestring4 forKey:#"savedstring4"];
BOOL savebool5 = _Switch.isOn;
[defaults setBool:savebool5 forKey:#"savedbool5"];
[defaults synchronize];
}
- (IBAction)loaddata:(id)sender; {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *loadstring = [defaults objectForKey:#"savedstring"];
[_NameofResident setText:loadstring];
NSString *loadstring1 = [defaults objectForKey:#"savedstring1"];
[_NameofStudent setText:loadstring1];
NSString *loadstring2 = [defaults objectForKey:#"savedstring2"];
[_AppointmentTime setDate:loadstring2];
NSString *loadstring3 = [defaults objectForKey:#"savedstring3"];
[_NextAppointmentTime setDate:loadstring3];
NSString *loadstring4 = [defaults objectForKey:#"savedstring4"];
[_Confirmed setText:loadstring4];
BOOL loadBool5 = [defaults boolForKey:#"savedbool5"];
[_Switch setOn:loadBool5];
}

Answer 2

You can solve your problem the following way:
//
// ViewController.m
//
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UISwitch *mySwitch;
- (IBAction)switchChanged:(id)sender;
#end
#implementation ViewController
- (IBAction)switchChanged:(id)sender
{
[[NSUserDefaults standardUserDefaults] setBool:self.mySwitch.on forKey:#"SwitchState"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.mySwitch.on = [[NSUserDefaults standardUserDefaults] boolForKey:#"SwitchState"];
}
#end
Happy programming !