Saving an object to array using NSMutableDictionary - ios4

Question

I have been trying to add an object as an NSMutableDictionary to my array, which I am accessing from another view, and It doesn't seem to work. I want to be able to store the data in a plist which I access from a NSDictionary.
-(void)saveAlarm:(id)sender {
// Adding object for alarm to AlarmViewController
alarmArrayCopy = alarmViewController.alarmsTime;
NSMutableDictionary *newAlarm = [[NSMutableDictionary alloc] init];
[newAlarm setValue:labelTextField.text forKey:LABEL_KEY];
[newAlarm setValue:alarmPicker.date forKey:TIME_KEY];
[alarmArrayCopy addObject:(newAlarm)];
// Dismissing and tiding up.
[self.navigationController dismissModalViewControllerAnimated:YES];
[newAlarm release];
}
UPDATE: How do I add an NSDictionary to my plist database (my db is an array)?
Here is some new code, I updated the NSMutableDictionary to NSDictionary because in my plist you can only have normal dictionaries not a mutable one. But now it crashed and gives me a Thread 1:Program received signal: "SIGABRT".
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:#"data.plist"];
// Adding object for alarm to AlarmViewController
NSDictionary *newAlarm = [[NSDictionary alloc] init];
[newAlarm setValue:labelTextField.text forKey:LABEL_KEY];
[newAlarm setValue:[NSString stringWithFormat:#"%#", alarmPicker.date] forKey:TIME_KEY];
[newAlarm writeToFile:finalPath atomically:NO];
or
-(IBAction)saveAlarm:(id)sender {
// Adding object for alarm to AlarmViewController
NSString *time = [NSString stringWithFormat:#"%#", alarmPicker.date];
NSString *label = [NSString stringWithFormat:#"%#",labelTextField.text];
NSDictionary *newAlarm = [[NSDictionary alloc] initWithObjectsAndKeys:label, LABEL_KEY,time, TIME_KEY, nil];
self.alarmArrayCopy = alarmViewController.alarmsTime;
[alarmArrayCopy addObject:(newAlarm)];
// Dismissing and tiding up.
[newAlarm release];
[self.navigationController dismissModalViewControllerAnimated:YES];
}

Answer 1

First, you should use setObject:forKey: method for adding objects to NSMutableDictionary. Second, you should use initWithObjectsAndKeys: method if you are using NSDictionary.
The setValue:forKey is a method of the Key Value Coding protocol. That was described at here “
Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?
”
So, you should do that,
NSDictionary *newAlarm = [[NSDictionary alloc] initWithObjectsAndKeys:
labelTextField.text, LABEL_KEY,
alarmPicker.date, TIME_KEY, nil];

Answer 2

[newAlarm setValue:alarmPicker.date forKey:TIME_KEY];
I am not quite sure, but I guess your error is because you can't send an instance of NSDate object to setValue:forKey method. You may use either setObject:forKey or change NSDate to NSString by [NSString stringWithFormat:"%#", alarmPicker.date].
Hope that helps.