Question

here’s what i’m trying to convert to objective c from c#:

public class Television
{
     public string Name {get; set};
     public bool isOn {get; set};
     public int channelNum {get; set};
     public string channelName {get; set};
}

let’s say the television fairy has been to my house, and i don’t know how many televisions are in there. or, i want to make this code reusable and since everyone has a different amount of televisions in their households, i want to make this a different number at every runtime.

 public List<Television> TVs = new List<Television>(4);

when i want to i can say:

 TVs[3].channelNum = 34;

1. in objective c, how would you put this in an array/dictionary(hashtable)? can you give me an example?
2. if i created a new object every time a new Television is put in the house, and accessed its properties, is this more efficient on memory than a list class would be? it seems like a list would be easier than creating 4 array sets, wouldn’t it?

3. could someone give me an example of how this would be used if i called

   Television TVs = [[Television alloc]init];

   and used properties instead?

4. could i use television objects in an nsmutablearray, and just pull them out to access their properties when i need them, or when they change?

Answer 1

Just something to give you an idea (though it’s not very lovely code)…

@interface Television : NSObject {
@private
    NSString *name;
    BOOL isOn;
    int channelNumber;
    NSString *channelName;
}
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign, getter=isOn) BOOL on;
@property (nonatomic, assign) int channelNumber;
@property (nonatomic, copy) NSString* channelName;
@end

Implemenation

@implementation Television
@synthesize name, on=isOn, channelNumber, channelName;
@end

Usage

Television *tv1 = [[[Television alloc] init] autorelease];
tv1.name = @"TV Name";
tv1.on = YES;
tv1.channelNumber = 236;
tv1.channelName = "Channel 236";

// create a mutable array to use as a list
NSMutableArray *array = [NSMutableArray array];

// add tv1 to the array
[array addObject:tv1];

// add another one
[array addObject:[[[Television alloc] init] autorelease]];
[array objectAtIndex:1].name = @"Another name";