Adding data to NSMutableArray from another view [closed] - iphone

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Closed 9 years ago.
I want to read the NSMutableArray *menu from my MenuViewController.h, i am tired of trying. This is my code now:
// ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#end
// ViewController.m
#import "ViewController.h"
#import "MenuViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#pragma mark - view Did Load, View Will Appear & didReceiveMemoryWarning
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)viewWillAppear:(BOOL)animated {
MenuViewController *menuView = [[MenuViewController alloc] init];
[self.view addSubview:menuView.view]; // this line is new
NSLog(#"%#", menuView.self.menu);
[menuView.menu addObject:#"Darommmm"];
NSLog(#"%#", menuView.menu);
[menuView.tableView reloadData];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
So this is the code of my viewController.m and .h. Below i will show the code of MenuViewController.h and .m
// MenuViewController.h
#import <UIKit/UIKit.h>
#interface MenuViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
#property (nonatomic, retain) IBOutlet UITableView *tableView;
#property (nonatomic, retain) NSMutableArray *menu;
#property (nonatomic, retain) NSMutableArray *sections;
#end
// MenuViewController.m
#import "MenuViewController.h"
#interface MenuViewController ()
#end
#implementation MenuViewController
#synthesize menu, sections, tableView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
#pragma mark - View Did load, View Will Appear & didReceiveMemoryWarning
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// set background to transparent + no seperator
[self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
self.tableView.backgroundColor = [UIColor clearColor];
// allocate the mutable array for our menu
self.menu = [[NSMutableArray alloc] init];
// standard menu items to our object
[self.menu addObject:#"Dashboard"];
[self.menu addObject:#"Chats"];
[self.menu addObject:#"Visitors"];
[self.menu addObject:#"Log Out"];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.menu count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [self.menu objectAtIndex:indexPath.row];
cell.textLabel.textColor = [UIColor whiteColor];
UIImageView *bg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"sidebarcell"]];
[bg setFrame:CGRectMake(0, 0, 161.5, 42.5)];
// Configure the cell...
cell.backgroundView = bg;
return cell;
}
I can't see what i'm doing wrong, when i try to NSLog the menuView.self.menu i get (null).. Hope you guys can help me out! Cheers.

Answer 1

MenuViewController's menu variable never appears to be initialized by the time you're using it, so it's just nil. Put an array in there in your init method (and don't set it in your viewDidLoad if you've already initialized it).

Answer 2

menu is nil at the time you're adding elements to it. You initialize it in viewDidLoad of MenuViewController, which is called only after you add that controller to a window. You can fix your issue by using this code, however I wouldn't recommend this as a permanent fix.
MenuViewController *menuView = [[MenuViewController alloc] init];
[self.view addSubview:menuView.view] // this line is new
NSLog(#"%#", menuView.self.menu);
[menuView.menu addObject:#"Darommmm"];
NSLog(#"%#", menuView.menu);
[menuView.tableView reloadData];
You also don't need to call self before accessing the properties of a class.
The proper approach here would be to move the initialization of the NSMutableArray to the controller's init method.