How to save Xcode application data

Question

I have been looking for many days how to save data from my applications. I found something, but it was very difficult and poorly explained. I need, when I completely close my applications, all the data that I entered in the text box is still there when I open my applications again. I tried the tutorial, but it only allowed me to save about 8 text fields, and I need to save thousands, I start Objective-C and Xcode, so if someone wants to give me an answer, please make it very accurate.

Answer 1

Well, I would suggest putting all the data from your text fields into an array and save this to a file, and then load it when you reopen the application.

The first thing you need is to save the file. This feature will create for you.

-(NSString*) saveFilePath{ NSString* path = [NSString stringWithFormat:@"%@%@", [[NSBundle mainBundle] resourcePath], @"myfilename.plist"]; return path;} 

Now that this is done, you need to create your save array. I hope you have thousands of text fields that are already set to some sort of array. If not, it will be a painful process, no matter how you solve it. But anyway ... (Here labelArray will be an array of all your text fields / labels, etc.)

 NSMutableArray* myArray = [[NSMutableArray alloc]init]; int i = 0; while(i < labelArray.count){ [myArray addObject: [labelArray objectAtIndex: i].text]; i ++; } [myArray writeToFile:[self saveFilePath] atomically:YES]; [myArray release]; 

And the download code will be something like lines

 NSMutableArray* myArray = [[NSMutableArray arrayWithContentsOfFile:[self saveFilePath]]retain]; 

Then you simply load the data back into your array of text fields.

Hope this helps.

Answer 2

It looks like your application architecture may be unreasonable if you plan to save thousands of text field data in the fraction of a second you receive while your application closes. It would probably be better to save them, as the user enters data instead of waiting to save all the data at once.

Answer 3

To get the path you are going to write (or read from!), You do the following:

NSString *writableDBPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"MyFile.extension"];

And then use a writeToFile: automically: "method from NSString or NSDictionary, etc. to write to the path.