Object of custom class is not getting store in NSMutableArray

Question

I want to add object to NSMutableArray but after writing following code i am getting benchmarkArray NIL. Where is the mistake help me please

    [benchmark setBenchmarkTitle:self.benchmarkTitle.text];
    [benchmark setBenchmarkDescription:self.benchmarkDescription.text];
    [benchmarkArray addObject:benchmark];

My Benchmark class is:

@interface Benchmark : NSObject

@property (nonatomic, retain) NSString *bid;
@property (nonatomic, retain) NSString *benchmarkTitle;
@property (nonatomic, retain) NSString *benchmarkDescription;

-(id)initWithCoder: (NSCoder *)coder;
-(void)encodeWithCoder:(NSCoder *)encoder;

@end

@implementation Benchmark

@synthesize bid;
@synthesize benchmarkTitle;
@synthesize benchmarkDescription;

- (id) initWithCoder:(NSCoder *)coder {

    self = [super init];
    if(self) {
        bid = [coder decodeObjectForKey:@"id"];
        benchmarkTitle = [coder decodeObjectForKey:@"benchmarkTitle"];
        benchmarkDescription = [coder decodeObjectForKey:@"benchmarkDescription"];
    }
    return self;
}

- (void) encodeWithCoder:(NSCoder *)encoder {

    [encoder encodeObject:bid forKey:@"id"];
    [encoder encodeObject:benchmarkTitle forKey:@"benchmarkTitle"];
    [encoder encodeObject:benchmarkDescription forKey:@"benchmarkDescription"];
}

@end

@peko i have already add this line at ViewDidLoad benchmarkArray = [[NSMutableArray]alloc] init]; — Muhammad Aamir Ali
– Muhammad Aamir Ali, Commented Mar 8, 2013 at 10:34

Anoop Vaidya · Accepted Answer · 2013-03-08 10:36:02Z

2

Nothing wrong with your BenchMark Class.

Your problem lies in the class where you have created benchMarkArray.

After making property of it, you need to initialise it in init/awakeFromNib/viewDidLoad method as :

benchMarkArray=[[NSArray alloc]init];

or,

benchmarkArray=[NSArray new];

answered Mar 8, 2013 at 10:36

Anoop Vaidya

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1 Comment

Muhammad Aamir Ali Over a year ago

- (void)viewDidLoad { [super viewDidLoad]; //set category/benchmark class object self.category = [[Category alloc] init]; self.benchmark = [[Benchmark alloc] init]; } i have already initialized it

peko · Accepted Answer · 2013-03-08 10:30:03Z

1

you forgot to allocate and initialize

benchmarkArray = [[NSMutableArray alloc] init];

answered Mar 8, 2013 at 10:30

peko

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