Question

I am trying to store a custom object in NSMutableDictionary. After saving when I read the object from NSMutableDictionary it’s always null.

Here is the code

//Saving

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];

CustomObject *obj1 = [[CustomObject alloc] init];
obj1.property1 = @"My First Property";

[dict setObject:obj1 forKey:@"FirstObjectKey"];
[dict writeToFile:[self dataFilePath] atomically:YES];

// Reading

 NSString *filePath = [self dataFilePath];
        NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

        CustomObject *tempObj = [dict objectForKey:@"FirstObjectKey"];

        NSLog(@"Object %@", tempObj);
        NSLog(@"property1:%@,,tempObj.property1);

How can I store a custom class object in NSMutableDictionary?

Answer 1

writeToFile method can store only standard types of objects into plist. If you have custom object you’d have to use NSKeyedArchiver/NSKeyedUnarchiver for this.