iOS NSKeyedUnarchiver not get correct value - ios

Question

I simplify the code for ask question.
I want to save more class and load class model file.
But now I simplify parameters to one part (lim) in the model(FlightSettingModel.h).
In the FlightSettingModel.h I have set some parameters in here.
FlightSettingModel.h code below:
#import <Foundation/Foundation.h>
#interface FlightSettingModel : NSObject<NSCoding>
// lim property part
#property float limCurrentVal;
#property float limDefaultVal;
#property float limMaxVal;
#property float limMinVal;
// .... other property part
#end
FlightSettingModel.m code below
#import "FlightSettingModel.h"
#interface FlightSettingModel()
{
}
#end
#implementation FlightSettingModel
-(instancetype)init
{
self = [super init];
if(self)
{
self.limDefaultVal = 3.0;
self.limCurrentVal = 4.0;
self.limMaxVal = 10;
self.limMinVal = 0;
// ... other property part value init .....
}
return self;
}
- (void)setFlightSettingToDefaultValue
{
self.limCurrentVal = self.limDefaultVal;
}
- (void) encodeWithCoder: (NSCoder *)encoder
{
[encoder encodeFloat:self.limCurrentVal forKey:#"limCurrentVal"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
self.limCurrentVal = [decoder decodeFloatForKey:#"limCurrentVal"];
}
return self;
}
#end
Then I have set the singleton SettingData file to initial the FlightSettingModel and other model class.
The SettingData model header like below:
#import <Foundation/Foundation.h>
#import "FlightSettingModel.h"
#interface SettingData : NSObject
#property (nonatomic,strong) FlightSettingModel *flightSettingModel;
+(SettingData*) sharedInstance;
#end
SettingData.m code below:
#import "SettingData.h"
#implementation SettingData
SettingData *sharedInstance;
+(SettingData*) sharedInstance{
if( sharedInstance == nil )
{
sharedInstance = [SettingData new];
}
return sharedInstance;
}
-(id) init{
self = [super init];
if( self )
{
self.flightSettingModel = [FlightSettingModel new];
}
return self;
}
#end
In my storyboard (UI) is like below:
When I click the save button , I want to save the custom class model(FlightSettingModel.h) in the NSKeyedArchiver. When I click the load, I want to load the model from the archiver using NSKeyedUnarchiver and resetting to the slider.
But now,when I drag the slider to other value(ex:10), then I click the save, then I close the app restart the app. I click the load, the slider value will become 0.
I don't know why when I load the value the all value will become 0;
My view controller code .m below:
#import "ViewController.h"
#import "SettingData.h"
#interface ViewController ()
{
NSString *path;
NSString *fileName;
}
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// file manage
path =[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex:0];
fileName = [path stringByAppendingPathComponent:#"flightFile"];
[self setUIValue];
NSLog(#"---");
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (IBAction)saveAction:(UIButton *)sender {
[NSKeyedArchiver archiveRootObject:[SettingData sharedInstance].flightSettingModel toFile:fileName];
}
- (IBAction)loadAction:(UIButton *)sender {
[SettingData sharedInstance].flightSettingModel = (FlightSettingModel*) [NSKeyedUnarchiver unarchiveObjectWithFile: fileName];
[self setUIValue];
NSLog(#"current Value:%.f",[SettingData sharedInstance].flightSettingModel.limCurrentVal);
}
- (IBAction)sliderChangedAction:(UISlider *)sender {
[SettingData sharedInstance].flightSettingModel.limCurrentVal = sender.value;
self.theTextField.text = [NSString stringWithFormat:#"%.f",self.theSlider.value];
}
-(void) setUIValue
{
// setting slider property
self.theSlider.maximumValue = [SettingData sharedInstance].flightSettingModel.limMaxVal;
self.theSlider.minimumValue = [SettingData sharedInstance].flightSettingModel.limMinVal;
self.theSlider.value = [SettingData sharedInstance].flightSettingModel.limCurrentVal;
self.theTextField.text = [NSString stringWithFormat:#"%.f",self.theSlider.value];
}
#end
Have anyone know where my problem in my code?
thank you very much.
If you want to download the complete code(the question code) , I have upload in github

Answer 1

This behavior happens because the [SettingData sharedInstance].flightSettingModel.limMaxVal and the [SettingData sharedInstance].flightSettingModel.limMinVal are zero:
-(void) setUIValue
{
// setting slider property
self.theSlider.maximumValue = [SettingData sharedInstance].flightSettingModel.limMaxVal;
// self.theSlider.maximumValue = 0
self.theSlider.minimumValue = [SettingData sharedInstance].flightSettingModel.limMinVal;
// self.theSlider.minimumValue = 0
self.theSlider.value = [SettingData sharedInstance].flightSettingModel.limCurrentVal;
// [SettingData sharedInstance].flightSettingModel.limCurrentVal = 10
self.theTextField.text = [NSString stringWithFormat:#"%.f",self.theSlider.value];
}
EDIT: You can fix it by adding this:
- (void) encodeWithCoder: (NSCoder *)encoder {
[encoder encodeFloat:self.limCurrentVal forKey:#"limCurrentVal"];
[encoder encodeFloat:self.limMaxVal forKey:#"limMaxVal"];
[encoder encodeFloat:self.limMinVal forKey:#"limMinVal"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
self.limCurrentVal = [decoder decodeFloatForKey:#"limCurrentVal"];
self.limMaxVal = [decoder decodeFloatForKey:#"limMaxVal"];
self.limMinVal = [decoder decodeFloatForKey:#"limMinVal"];
}
return self;
}