Issue in NSUserDefaults while retrieving data, value change from "0" to "1" - objective-c

Question

I am beginner in Objective C, while performing my Assignment I tried to save the object in NSUserDefaults
Object Created Successfully and after reopening of Object, the value changes of BOOL instance variable , from 0 to 1 of all objects.
Protocol's Method, which evaluates on Task Creation..
-(void)didAddTask:(Task *)task{
[self.taskObjects addObject:task];
NSMutableArray *arrayOfTaskObjects = [[[NSUserDefaults standardUserDefaults]arrayForKey:TASK_OBJECTS_KEY] mutableCopy];
NSLog(#"%#",arrayOfTaskObjects);
if (!arrayOfTaskObjects) {
arrayOfTaskObjects = [[NSMutableArray alloc]init];
}
[arrayOfTaskObjects addObject:[self taskObjectAsAPropertyList:task]];
[[NSUserDefaults standardUserDefaults] setObject:arrayOfTaskObjects forKey:TASK_OBJECTS_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
[self dismissViewControllerAnimated:YES completion:nil];
[self.tableView reloadData];
}
The method to create Property List:
- (NSDictionary *)taskObjectAsAPropertyList:(Task *)taskObject{
NSDictionary *myDictionary = #{TASK_TITLE:taskObject.taskTitle,
TASK_DESCRIPTION:taskObject.taskDescription,
TASK_DATE:taskObject.taskDate,
TASK_COMPLETION:#(taskObject.isTaskCompleted)};
NSLog(#"Task Completion: %#", myDictionary[TASK_COMPLETION]);
return myDictionary;
}
EDIT:
Code of Task Class:
#implementation Task
-(id)init{
self = [self initWithData:nil];
return self;
}
-(id)initWithData:(NSDictionary*)data{
self = [super init];
if (self) {
self.taskTitle = data[TASK_TITLE];
self.taskDescription = data[TASK_DESCRIPTION];
self.taskDate = data[TASK_DATE];
self.isTaskCompleted = data[TASK_COMPLETION];
}
return self;
}
#end
Edit 2:
NSMutableArray * demoArray = [[[NSUserDefaults standardUserDefaults]arrayForKey:TASK_OBJECTS_KEY]mutableCopy];
NSLog(#"Retrievd Array From NSUserDefaults : %#", demoArray);
for(NSDictionary *dic in demoArray){
Task *myTask = [[Task alloc]init];
myTask.taskTitle = dic[TASK_TITLE];
if (dic[TASK_COMPLETION]==0) {
myTask.isTaskCompleted = NO;
}
else{
myTask.isTaskCompleted = YES;
}
//myTask.isTaskCompleted = dic[TASK_COMPLETION];
myTask.taskDescription = dic[TASK_DESCRIPTION];
myTask.taskDate = dic[TASK_DATE];
[self.taskObjects addObject:myTask];
}

Answer 1

Make Sure that the Data you're going to save in NSUserDefaults, is the same that you entered, by Using NSLog statement.