modify an nsmutablearray in another class - ios

Question

I have a NSMutableArray of seven bools in managerViewController, these represent days of the week when a shop is open. I am running out of space in this view and most of the time the user will be happy with the default setting of open all hours.
the user needs to be able to change them to suit their business needs, my current approach to this is to have a uitableview of seven rows all of which have switches in them. where I am stuck is how to the actions of in uitableview modify the original nsmuntable array in the manageViewController class.
I am new to iOS, but I have built the UITableView and all the other bits, it is just accessing the NSMutableArray I am stuck on.

Answer 1

Use replaceObjectAtIndex:withObject: or, with the new objective-c literals it's much easier:
NSMutableArray *myArray = [NSMutableArray array];
myArray[0] = #(YES); // the same as: [myArray addObject:[NSNumber numberWithBool:YES]];
myArray[0] = #(NO); // the same as: [myArray replaceObjectAtIndex:0 withObject:[NSNumber numberWithBool:YES]];

Answer 2

Define a delegate to your table view controller, sayTableViewControllerDelegate. Add a delegate property to your table view controller
#property (weak, nonatomic) id delegate;
Make your ManagerViewController conform to the delegate protocol, and upon showing TableViewController, set its delegate to be your ManagerViewController instance.
Add a method in the delegate to inform the action on a day, for example:
- (void) didModifyDay:(NSInteger)dayNumber;
or
- (void) didChangeDay:(NSInteger)dayNumber toState:(BOOL)selected;

Answer 3

When table view is loading in the
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
make sure to check initial values for all of the switch and set values from your data source (the mutable array). For easily handle the situation use a custom and put its object in the array.
#interface Days : NSObject
#property (nonatomic, retain) NSString *day;
#property (nonatomic, assign) BOOL isOpen;
#end
i.e.
for(int ii = 0; ii < 7; ii++ ){
Days *days = [[Days alloc] initWithDay:ii isOpen:YES];
[array addObject:days];
[days release];
}
Assume that you have a custom UITableViewCell which have a property set to the switch.
i am using cell.switch for example.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"reusableCells";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if(cell == nil)
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];
Days *days = [array objectAtIndex:indexPath.row];
cell.textLabel.text = days.day;
[cell.switch setOn:days.isOpen animated:YES];
return cell;
}
and this will handle your switch.
now assume you toggle the switch on/off when press the table cell so handle the didSelectRowAtIndexPath method of the tableview delegate
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
Days *days = [array objectAtIndex:indexPath.row];
days.isOpen != days.isOpen;
[cell.switch setOn:days.isOpen animated:YES];
}
That's all. you will get the switch toggle on/off and the will be manipulated from the array.

Answer 4

You can use the app delegate class of your application to access the NSMutableArray.
In the app delegate class create the property for the class in which that NSMutableArray is present for e.g let say class name is TestController.
//then in .h file of Appdelegate
#import TestController.h
//in the interface
TestController *objTest;
//declare the property
#property (nonatomic, strong) TestController *objTest;
//then in the .m file of app delegate synthesize the object
#synthesize objTest;
Now in the similar way declare the property for NSMutableArray in the TestController
Create the share instance of the app delegate class where you want to access the NSMutable array object(say arr1) as below
AppDelegate *objAppDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
You can access that array as "objAppDelegate.objTest.arr1"
Or
You can create the share instance in the view controller class
//in the .h of view controller
+ (id)sharedInstance;
//in the .m of view controller
+ (id)sharedInstance
{
// structure used to test whether the block has completed or not
static dispatch_once_t p = 0;
// initialize sharedObject as nil (first call only)
__strong static id _sharedObject = nil;
// executes a block object once and only once for the lifetime of an application
dispatch_once(&p, ^{
_sharedObject = [[self alloc] init];
});
// returns the same object each time
return _sharedObject;
}
Then in the application where you fill the array use,
TestViewController *objTest=[TestViewController sharedInstance];
objTest.arr1=[[NSMutableArray alloc]initWithObjects:#"1",#"1",#"1",#"1", nil];
And in the table view controller you can access it as below
TestViewController *objTest=[TestViewController sharedInstance];
objTest.arr1 will be the resulted array.