Saving an object to array using NSMutableDictionary

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];

}

I don't get any errors, it just doesn't work. – Souljacker Oct 08 '11 at 11:40 — Souljacker, Oct 08 '11 at 11:40

score 2 · Accepted Answer · edited May 23 '17 at 12:21

2

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];

edited May 23 '17 at 12:21

Community

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answered Nov 02 '11 at 03:46

cockscomb

996
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thanks, this solved my problem but I have encountered a new problem. The data stored in the dictionary, how do I add it to my plist? I mean I have tried writeToFile and trying to add it to a array but I can't. I will put some new code up. – Souljacker Nov 02 '11 at 11:06

score 1 · Answer 2 · answered Oct 21 '11 at 19:13

1

[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.

answered Oct 21 '11 at 19:13

Sierra Alpha

3,707
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`setObject:forKey`, not `setValue:forKey` – Abizern Dec 14 '11 at 15:05

Saving an object to array using NSMutableDictionary

2 Answers2