Obj C - Accessing custom class properties from and array of class objects

Question

I have a custom object class with some properties lets say.

@property (nonatomic,retain) NSString *Name;
@property (nonatomic,retain) NSString *ImgURL;
@property (nonatomic,retain) NSArray  *Messages;

I then go through a loop and populate the data and add each instance to an array like this

for(NSDictionary *eachEntry in details)
{
    ClientData *client;
    client.Name = [eachEntry objectForKey:@"name" ];
    client.ImgURL = [eachEntry objectForKey:@"img"];
    client.Messages = [eachEntry objectForKey:@"message" ];

    [_Data addObject:client];  
}

now in a table i want to display some of this data in a list, how can i get access to each property by name not key or index.

so at the moment i have this in my cellForRowAtIndexPath

 NSString *name = [[self.Data objectAtIndex:indexPath.row]  objectForKey:@"name"];

obviously this doesn't work because i haven't set keys

and i don't want to do this

NSString *name = [[self.Data objectAtIndex:indexPath.row]  objectAtIndex:1];

How can i access Client.Name etc

instance names beggining with small letter. For example: NSString *name; — Stefan
– Stefan, Commented Dec 17, 2015 at 14:30

Jordan Davies · Accepted Answer · 2015-12-17 15:12:25Z

1

self.Data is an array of ClientData objects so you can just do:

NSString *Name = ((ClientData *)[self.Data objectAtIndex:indexPath.row]).Name;

or:

ClientData *clientData = self.Data[indexPath.row];
NSString *name = clientData.Name;

edited Dec 17, 2015 at 15:12

answered Dec 17, 2015 at 14:28

Jordan Davies

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2 Comments

rmaddy Over a year ago

Or: NSString *name = [self.data[indexPath.row] Name];.

rmaddy Over a year ago

BTW - the cast is not needed in the 2nd code example.

Wain · Accepted Answer · 2015-12-17 14:24:18Z

1

Key Value Coding (KVC). Replace objectForKey with valueForKey.

answered Dec 17, 2015 at 14:24

Wain

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5 Comments

Rob85 Over a year ago

Hi Wain, does this give the same as JDx's answer, is there any reason to do it like this rather than JDx's

rmaddy Over a year ago

This answer doesn't apply to the question being asked.

Wain Over a year ago

KVC is a different and generic way of accessing a value from an object for a specified key. All of the options presented are runtime checks with different ways of making the compiler happy with the request. They all have the same end result.

Rob85 Over a year ago

Does the properties actual name class as the key because i am not giving them any keys when i add the data to the array

Wain Over a year ago

Yes, the key is used to search for an accessor method to call

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