Replace item in NSMutablearray - ios

Question

I have an NSMutablearray that I have data saved to. Data is input on my main ViewController. When you tap on a saved item, the SecondViewController has a textfield that the data entry is loaded into in order to be edited. I want to be able to edit that item and then save it back to the array.
I am fairly new to Objective-C / Cocoa Touch so please go easy on me.
- (ToDoItem *) updateToDoItem: (ToDoItem *) todoitem {
NSLog(#"ToDoItemSvc.updateToDoItem: %#", [todoitem description]);
NSMutableArray *toDoItems = [NSMutableArray array];
for (NSString *todoitem in toDoItems) {
if ([[ToDoItem] isEqualToString:toDoItems]) {
[toDoItems replaceObjectAtIndex:todoitem];
}
}
I know this isnt completely correct and may be completely off base but Im hoping I am moving in the right direction with this.
EDIT
Here is my ToDoItemSvcArchive.m file
#import "ToDoItemSvcArchive.h"
#implementation ToDoItemSvcArchive
NSString *filePath;
NSMutableArray *toDoItems;
- (id) init {
NSArray *dirPaths =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *docsDir = [dirPaths objectAtIndex:0];
filePath = [[NSString alloc] initWithString: [docsDir
stringByAppendingPathComponent: #"ToDoItems.archive"]];
[self readArchive];
return self;
}
- (void) readArchive {
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: filePath])
{
toDoItems = [NSKeyedUnarchiver unarchiveObjectWithFile: filePath];
}
else
{
toDoItems = [NSMutableArray array];
}
}
- (void) writeArchive {
[NSKeyedArchiver archiveRootObject:toDoItems toFile:filePath];
}
- (ToDoItem *) createToDoItem: (ToDoItem *) todoitem {
NSLog(#"ToDoItemSvc.createToDoItem: %#", [todoitem description]);
[toDoItems addObject:todoitem];
[self writeArchive];
return todoitem;
}
- (NSMutableArray *) retrieveAllToDoItems {
return toDoItems;
}
- (ToDoItem *) updateToDoItem: (ToDoItem *) todoitem {
NSLog(#"ToDoItemSvc.updateToDoItem: %#", [todoitem description]);
NSMutableArray *toDoItems = [NSMutableArray array];
for (NSString *todoitem in toDoItems) {
if ([[ToDoItem] isEqualToString:toDoItems]) {
[toDoItems replaceObjectAtIndex:todoitem];
}
}
// return todoitem;
}
- (ToDoItem *) deleteToDoItem: (ToDoItem *) todoitem {
NSLog(#"ToDoItemSvc.deleteToDoItem: %#", [todoitem description]);
[toDoItems removeObject:todoitem];
[self writeArchive];
return todoitem;
}
#end
EDIT
I guess what I dont really understand is how to get the actual index of the object that needs to be replaced.
Edit
I think this is better
- (ToDoItem *) updateToDoItem: (ToDoItem *) todoitem {
NSLog(#"ToDoItemSvc.updateToDoItem: %#", [todoitem description]);
NSUInteger index = [toDoItems indexOfObject:todoitem];
[toDoItems replaceObjectAtIndex:0 withObject:todoitem];
return todoitem;
}
Im still not sure how to specify the correct index.

Answer 1

Over complicating the entire thing
Changed todoitemtext to todoitemobject and made it a todoitem rather than an NSString. Now when I click update, it updates the object and when you go back to the list, the view calls reloaddata and the view is updated with the new object
- (IBAction)updateToDoItem:(id)sender {
NSLog(#"updatingToDoItem: entering");
toDoItemObject.todoitem = toDoItem.text;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
toDoItem.text = toDoItemObject.todoitem;
}
Works like a champ now.