My application crashes with this error - 'NSInvalidArgumentException' - ios

Question

I have created a program to retrieve JSON file and it achieved it
NSString *FilePath = [[NSBundle mainBundle]pathForResource:#"Message" ofType:#"json"];
NSData *data = [NSData dataWithContentsOfFile:FilePath];
NSError *error;
if(error){
NSLog(#"Error and CAn't retrive data: %#", error.localizedDescription);
}else{
NSDictionary * jsonDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(#"Your Json Dictionary values are %#", jsonDict);
for(NSDictionary *valuesDictionary in jsonDict){
ShopCollectionObject *shopObject = [[ShopCollectionObject alloc]initWithID:[[valuesDictionary objectForKey:#"message_id"]integerValue] Name:[valuesDictionary objectForKey:#"product"] TimeAsPrice:[[valuesDictionary objectForKey:#"message_time"]integerValue] Avathar:[valuesDictionary objectForKey:#"item_image"] user:[valuesDictionary objectForKey:#"user_image"] Name_User:[valuesDictionary objectForKey:#"user_name"] LocationOfUser:[valuesDictionary objectForKey:#"locate_user"]];
But My app crashes here with the above error
[self.objectForArray addObject:shopObject];
}
}
Updated my shop collection code below
Shopcollection object.h
#import <Foundation/Foundation.h>
#interface ShopCollectionObject : NSObject
-(instancetype) initWithID: (int)msgID Name:(NSString *)Profile_name TimeAsPrice:(int) GivenTimeAsPrice Avathar:(NSString *) PhotoOfAvathar user:(NSString *)UserAvathar Name_User: (NSString *) UserNames LocationOfUser:(NSString *) USerLocationGiven;
#property (nonatomic) int msgID;
#property(nonatomic, strong)NSString* Name;
#property (nonatomic) int TimeAsPrice;
#property (nonatomic,strong) NSString* Avathar;
#property (nonatomic,strong) NSString* user;
#property (nonatomic,strong) NSString* Name_User;
#property(nonatomic,strong) NSString* LocationOfUser;
#end
Shopcollectionobject.m
#import "ShopCollectionObject.h"
#implementation ShopCollectionObject
-(instancetype)initWithID:(int)msgID Name:(NSString *)Profile_name TimeAsPrice:(int)GivenTimeAsPrice Avathar:(NSString *)PhotoOfAvathar user:(NSString *)UserAvathar Name_User:(NSString *)UserNames LocationOfUser:(NSString *)USerLocationGiven{
self = [super init];
if(self){
self.msgID = msgID;
self.Name = Profile_name;
self.TimeAsPrice = GivenTimeAsPrice;
self.Avathar = PhotoOfAvathar;
self.user = UserAvathar;
self.Name_User = UserNames;
self.LocationOfUser = USerLocationGiven;
}
return self;
}
#end

Answer 1

You likely aren't initializing your objectForArray. So when you try to call addObject, it's calling it on a null object.

Answer 2

ShopCollectionObject.h
#import <Foundation/Foundation.h>
#interface ShopCollectionObject : NSObject
#property (nonatomic) int message_id;
#property (strong, nonatomic) NSString *Name;
#property (nonatomic) int TimeAsPrice;
#property (strong, nonatomic) NSString *Avathar;//user,Name_User,LocationOfUser,message_id
#property (strong, nonatomic) NSString *user;
#property (strong, nonatomic) NSString *Name_User;
#property (strong, nonatomic) NSString *LocationOfUser;
-(instancetype) initWithID: (int)msgID Name:(NSString *)Profile_name TimeAsPrice:(int) GivenTimeAsPrice Avathar:(NSString *) PhotoOfAvathar user:(NSString *)UserAvathar Name_User: (NSString *) UserNames LocationOfUser:(NSString *) USerLocationGiven;
#property (nonatomic) int msgID;
#end
ShopCollectionObject.m
#import "ShopCollectionObject.h"
#implementation ShopCollectionObject
-(instancetype)initWithID:(int)msgID Name:(NSString *)Profile_name TimeAsPrice:(int)GivenTimeAsPrice Avathar:(NSString *)PhotoOfAvathar user:(NSString *)UserAvathar Name_User:(NSString *)UserNames LocationOfUser:(NSString *)USerLocationGiven{
self = [super init];
if(self){
self.msgID = msgID;
self.Name = Profile_name;
self.TimeAsPrice = GivenTimeAsPrice;
self.Avathar = PhotoOfAvathar;
self.user = UserAvathar;
self.Name_User = UserNames;
self.LocationOfUser = USerLocationGiven;
}
return self;
}
#end
ViewController.m
#import "ViewController.h"
#import "ShopCollectionObject.h"
#interface ViewController ()
{
NSMutableArray *objectForArray;
}
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
objectForArray = [[NSMutableArray alloc]init];
NSString *FilePath = [[NSBundle mainBundle]pathForResource:#"Message" ofType:#"json"];
NSData *data = [NSData dataWithContentsOfFile:FilePath];
NSError *error;
if(error){
NSLog(#"Error and CAn't retrive data: %#", error.localizedDescription);
}else{
NSDictionary * jsonDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
for(NSDictionary *valuesDictionary in jsonDict){
ShopCollectionObject *shopObject = [[ShopCollectionObject alloc]initWithID:[[valuesDictionary objectForKey:#"message_id"]intValue] Name:[valuesDictionary objectForKey:#"product"] TimeAsPrice:[[valuesDictionary objectForKey:#"message_time"]intValue] Avathar:[valuesDictionary objectForKey:#"item_image"] user:[valuesDictionary objectForKey:#"user_image"] Name_User:[valuesDictionary objectForKey:#"user_name"] LocationOfUser:[valuesDictionary objectForKey:#"locate_user"]];
[objectForArray addObject:shopObject];
}
NSLog(#"%#",objectForArray);
ShopCollectionObject *data = objectForArray[0];
NSLog(#"%#",data.Name);
}
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
pls check this code