saving changed text in textview loaded from NSMutableDictionary - iphone

Question

I have a UITextView in a DetailViewController with some text which is loaded from a NSMutableDictionary in the MainViewController. Here is the code for that;
- (void) coverflowView:(TKCoverflowView*)coverflowView coverAtIndexWasDoubleTapped:(int)index{
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
if ((int)index == 0) {
NSMutableDictionary *myDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:
#"This is some text", #"textkey", nil];
detailViewController.myDictionary = myDictionary;
}
I have loaded the string from this into my DetailViewController with this code;
self.myText.text = [(NSMutableDictionary *)myDictionary objectForKey:#"textkey"];
Also in my viewDidLoad I have created a RightBarButton named 'Save' which I use to hide the keyboard when the viewer is done editing. I would like this button to also save the changes the viewer enters into the UITextView (as well as the original text).
This is the code for the rightBarButton;
UIBarButtonItem *saveButton =[[UIBarButtonItem alloc]
initWithTitle:#"Save"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(textViewDidChange:)];
self.navigationItem.rightBarButtonItem = saveButton;
Lastly I have code which envokes the textVidewDidChange and hides the keyboard. I am trying to also have it save the changes to the textView but it doesn't.
-(void)textViewDidChange:(UITextView *)textView;
{
if( textView == myText )
[myDictionary setValue:myText.text forKey:#"textkey"];
[myText resignFirstResponder];
}
Can anyone help me accomplish this. I simply want to save the changes to the UITextView back to the NSMutableDictionary. (or maybe not so simply)
I have changed the button to
`UIBarButtonItem *saveButton =[[UIBarButtonItem alloc]
initWithTitle:#"Save"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(didChangeValueForKey:)];
self.navigationItem.rightBarButtonItem = saveButton;`
and other code to ;
`-(void)didChangeValueForKey:(NSString *)key{
NSError *error;
[myDictionary setValue:[self myText].text forKey:#"textkey"];
[myText resignFirstResponder];
NSLog(#"%#", [myDictionary valueForKey:#"textkey"]);
}
My NSLog shows the changes but when I reopen the app they are gone, not saved. Can one save directly to the NSMutableDictionary?
I read a lot on persistent data. Thought NSData or Plist but try as I may not doing well.
Can someone suggest a good tutorial on this?
I looked at suggested link and added this (bold part) to my code.
`-(void)didChangeValueForKey:(NSString *)key{
/* NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:[(NSMutableDictionary *)myDictionary objectForKey:#"textkey"]];*/
NSError *error;
[myDictionary setValue:[self myText].text forKey:#"textkey"];
**[myDictionary writeToFile:#"textkey" atomically:YES];**
[myText resignFirstResponder];
NSLog(#"%#", [myDictionary valueForKey:#"textkey"]);
}`
As you can see I also tried getting the path using [NSHomeDirector] above and then replaced
#"textkey" with path. I can still see the changes in NSLog (either way) but there is no change when I reload the view or relaunch the app.
I have change things so that I am saving a text file of the text in the textview with the name gotten from the dictionary so that each time a different detailView is loaded depending on the image selected in the mainViewController.
This is my dictionary entry in the mainViewController;
`if ((int)index == 0) {
NSMutableDictionary *myDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:
//here is where I want to access the text file name to load in the UITextView in my DetailView
#"first View Text", #"textkey2",
//This is where I give the text file of the changed text its name for each different view of the DetailView
#"first View Text", #"textkey3",nil];
detailViewController.myDictionary = myDictionary;
}`
Next is the code I use to save the changes to the textView using the UIbarbuttonright
`- (void)saveAction:(id)sender {
[self.myText2 resignFirstResponder];
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:[(NSMutableDictionary *)myDictionary objectForKey:#"textkey3"]];
NSString *savedString = myText2.text;
NSLog(#"The Save file is:%#", savedString);
[savedString writeToFile:documentTXTPath atomically:YES
encoding:NSUTF8StringEncoding error:NULL];
}`
I have checked this and the file is saved in the documents folder under the name of First View Text and it does contain the changed text.
I am having problems loading the text file contents into the UITextView.
Using the code I have I get the path to the textkey2 object (First Text View) not the contents of the file.
`NSString *textName = [myDictionary objectForKey:#"textkey2"];
NSArray *paths2 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory2 = [paths2 objectAtIndex:0];
NSString *fullPath2 = [documentsDirectory2 stringByAppendingPathComponent:textName];
/* self.myText2.text = fullPath2;*/
self.myText2.text = [NSString stringWithContentsOfFile:fullPath2 encoding:NSUTF8StringEncoding error:NULL];`
I replaced this last line with the one that isn't commented out and it works fine. For anyone who want to know.

Answer 1

You need to implement data persistence, e.g. saving the text into permanent storage that you can retrieve again when you reload the view later on.