I want to have user select between two different buttons on a view, If the the user selects the imageOne, a label is created called "imageOne", then I'll save the label into an array using the following technique:
- (IBAction)saveData {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *choice = [NSString stringWithFormat:#"%#/userschoice", documentsDirectory];
NSMutableArray *array = [[NSMutableArray alloc] init];
[array addObject:imageOne.text];
[array writeToFile:choice atomically:NO];
}
I'm trying to avoid using the Picker and a Tableview as I only have two choices and it will be easier for user to choose with a button. any guidance would be appreciated.
Thanks.
Michael
Create the button, either in Interface Builder or in code
Hook up the button's delegate to point to the controller
Implement a method to do something in the controller (see link from number 2)
Save data
Related
In the program I use this method to create a file in which I can save:
-(NSString*) saveFilePath{
NSString* path = [NSString stringWithFormat:#"%#%#",
[[NSBundle mainBundle] resourcePath],
#"savingfile.plist"];
return path;}
Then I used a button to initiate the process of putting the data into the file (I first put it all into an array so that it would be easier.):
- (IBAction)save
{
NSMutableArray *myArray = [[NSMutableArray alloc] init];
[myArray addObject:name.text];
[myArray addObject:position.text];
[myArray addObject:cell.text];
[myArray addObject:office.text];
[myArray addObject:company.text];
[myArray writeToFile:[self saveFilePath] atomically:YES];
}
Finally, I loaded the information back into the textfields in the - (void)viewDidAppear method.
- (void)viewDidAppear:(BOOL)animated
{
NSMutableArray* myArray = [NSMutableArray arrayWithContentsOfFile:[self saveFilePath]];
name.text = [myArray objectAtIndex:0];
position.text = [myArray objectAtIndex:1];
cell.text = [myArray objectAtIndex:2];
office.text = [myArray objectAtIndex:3];
company.text = [myArray objectAtIndex:4];
}
For some reason, on the simulator it's working perfectly on the simulator, but not working at all when I try to run on my physical iPhone.
I think you're trying to save to a location that's read-only on iOS. It works on the simulator because the simulator doesn't totally replicate the sandboxing environment on the actual hardware.
Rather than saving to the resourcesPath you should be saving your files to the Documents directory (or the cache directory, if appropriate).
You can get a path to the documents directory as follows:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
There's more information at this question here: How to save file in resource folder of an app in Objective-c
I have a view responsible for recording audio. How can i record several audios and show them in a table view?
I'm trying to use docs directory to save the recorded audios:
NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsFolder = [folders objectAtIndex:0];
NSString *recordedAudio = [documentsFolder stringByAppendingPathComponent:newAudio];
newAudio is a string that contains new audio name typed by the user with the suffix .m4a.
To retrieve the saved audios i'm trying something like this:
NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsFolder = [folders objectAtIndex:0];
NSArray *folderContents = [[NSArray alloc] initWithContentsOfFile:documentsFolder];
I expected folderContents would have all the audios stored at documentsFolder so a could load my table, but its count is 0. I'm new in docs directory, probably i'm missing something, or doing all wrong.
What is wrong, or there is another way to accomplish that?
You are getting the contents of the documents directory incorrectly. This is the right way:
NSArray *folderContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsFolder error:nil];
Documents is not a file, it is a folder.
edit: This is how you save a file
Assuming you have an NSData object such as
NSData *audioData = ...; // initialiazed with your recording
After you create your recordedAudio string, which is actually just the filename you want to write to (should probably called audioPath or something), you need to add this:
[audioData writeToFile:recordedAudio atomically:YES];
My score is displaying just not in the correct order. I've been trying to make a method that uses #selector(compare:) but have had no such luck.
Here's the code I'm working with and I'm wanting to display it from highest to lowest. I'm also wanting to have it so that if you load the app for the first time it creates an empty array so that if the user tries to look at the highscores it doesn't crash the app.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *scoresListPath = [documentsDirectory stringByAppendingPathComponent:#"scores.plist"];
scoresList = [[NSMutableArray arrayWithContentsOfFile:scoresListPath] retain];
if (scoresList == nil) {
scoresList = [[NSMutableArray array] retain];
}
and
- (void)addHighScore:(float)finalScore {
[scoresList addObject:[NSNumber numberWithFloat:finalScore]];
[scoresList sortUsingSelector:#selector(compare:)];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *scoresListPath = [documentsDirectory stringByAppendingPathComponent:#"scores.plist"];
[scoresList writeToFile:scoresListPath atomically:YES];
}
The reason your code is failing is because arrayWithContentsOfFile: returns an immutable array even though it is called on NSMutableArray. You should make a mutable copy of the array that you read of the file like this,
scoresList = [[NSArray arrayWithContentsOfFile:scoresListPath] mutableCopy];
This will give you an NSMutableArray object which can be added to.
Not sure about lowest but,you can use GKLeaderBoardViewController class for counting Highest Score.For more details I suggested you to read below link.Thanks
http://developer.apple.com/library/ios/#documentation/GameKit/Reference/GKLeaderboardViewController_Ref/Reference/Reference.html
I was trying to use a plist to store an array with the below code:
NSString *name = firstName.text;
NSString *path = [[NSBundle mainBundle] pathForResource:#"Names" ofType:#"plist"];
NSMutableArray *namesArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
[namesArray addObject:name];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
[paths release];
NSString *docDirPath = [documentsDirectory stringByAppendingPathComponent:#"Names.plist"];
[namesArray writeToFile:docDirPath atomically:YES];
namesArray = [[NSMutableArray alloc] initWithContentsOfFile:docDirPath];
This code seems to work. Using NSLog, I have found that after this code executes the plist contains what I want it to, however, my program crashes because it generates an EXC_BAD_ACCESS on a device, and on the simulator it just crashes without an explanation. Does anyone know why that might happen?
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES); //Auto-released array
NSString *documentsDirectory = [paths objectAtIndex:0];
[paths release]; //Oh noes!
You don't own the reference to paths, so don't release it. Remove [paths release] and I'll bet you're fine. You're crashing because the autorelease pool is releasing paths after you've already done it yourself.
Quoth the guide:
You only release or autorelease objects you own. You take ownership of an object if you create it using a method whose name begins with “alloc” or “new” or contains “copy” ... or if you send it a retain message.
Have you checked, at which place it is giving EXC_BAD_ACCESS error.
In your code there are two wrong things; those are.
The Plist file consists a dictionary not an array, Here in the code you are copying the file data to an array. and saving the array to the plist file.
Second one is you are releasing the "paths" array, with out completion of usage of it. you have to release that array at the end of the statements; like after updating the array to the file.
Regards,
Satya
I have a NSMutableArray, each item in this array is different class. In each class has many field such as CPPlot, identifier,... (I am using CorePlot to develop a stock application). Now I would like to store this NSMutableArray to load when user reopen application, this will load all the chart they used before.
I try to figure out how to do that in Stackoverflow. And I found out there were 2 solutions:
NSUserDefaults
SQLite database
In NSUserDefaults, when I want to store NSMutableArray, I must implement with NSKeyedArchiver to archive and unarchive array object, also do NSCoding protocol for each item in array object. But I can not do this solution because in each item, it has some fields from CorePlot library, so that I can not use NSCoding to these fields.
SQLite database, I can not use this solution because each item in array object is different class.
I would like to ask if any other solution to solve this problem?
I hope my words are clear enough to understand.
Thanks
I would suggest you figure out what kind of data is at the root of your CorePlot objects. If it is integers, then simply store them in NSUserDefaults, and then simply rebuild your NSMutableArray on re-opening the app. Another option is to store your items in a separate plist file.
Use this method to save:
- (NSArray *)applicationDataFromFile:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirecotiresInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory
stringByAppendingPathComponent:fileName];
NSArray *myData = [NSArray arrayWithContentsOfFile:appFile];
return myData;
}
- (BOOL)saveToFileForStringArray:(NSMutableArray *)array
toFile:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
if (!documentsDirectory) {
NSLog(#"Documents directory not found!");
return NO;
}
NSString *appFile = [documentsDirectory
stringByAppendingPathComponent:fileName];
return ([array writeToFile:appFile atomically:YES]);
}