CODEWITHSUNDEEP
iosjsonsqlitensdictionarynsdata
dicle
dicle

Reputation: 1162

How to save JSON data to iPhone

I have a json data to show some infos.. but i should generate "a file" to save these infos to my iPhone. Ideas? 

- (void)showInfos {
NSMutableDictionary *infoDictionary = [[NSMutableDictionary alloc]init];
[infoDictionary setObject:self.totalDuration.text forKey:@"totalFrames"];

NSMutableArray *nodesArray = [[NSMutableArray alloc]init];
[nodesArray addObject:@{@"x":@(_zeroButton.frame.origin.x),@"y":@(_zeroButton.frame.origin.y),@"frame":self.zeroBtnLbl.text}];
[nodesArray addObject:@{@"x":@(_firstButton.frame.origin.x),@"y":@(_firstButton.frame.origin.y),@"frame":self.firstBtnLbl.text}];
[nodesArray addObject:@{@"x":@(_secondButton.frame.origin.x),@"y":@(_secondButton.frame.origin.y),@"frame":self.secondBtnLbl.text}];
[nodesArray addObject:@{@"x":@(_thirdButton.frame.origin.x),@"y":@(_thirdButton.frame.origin.y),@"frame":self.thirdBtnLbl.text}];
[nodesArray addObject:@{@"x":@(_fourthButton.frame.origin.x),@"y":@(_fourthButton.frame.origin.y),@"frame":self.fourthBtnLbl.text}];
[infoDictionary setObject:nodesArray forKey:@"nodes"];

NSLog(@"dicArray:%@",infoDictionary);
NSData *data = [NSJSONSerialization dataWithJSONObject:infoDictionary options:kNilOptions error:nil];
NSArray *retDicArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSLog(@"retDicArray:%@",retDicArray);
}

Upvotes: 0

Views: 1356

Answers (2)

Thomas
Thomas

Reputation: 677

Do you really need to save it into a file or you just want to serialize the information into the app?

Personally I often use the NSUserDefaults to save simple user information inside the app.

For example, if you want to store an integer:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setInteger:newDistance forKey:@"myInteger"];
[defaults synchronize];

Then when you want to retrieve it, simply do: 

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
int myInteger = (int)[defaults integerForKey:@"myInteger"];

You can store also NSArray, so it should work for you.

If you have more complicated structure to serialize you can use Core Data but it's a lot more complicated.

Upvotes: 0

Midhun MP
Midhun MP

Reputation: 107201

You can write that data to file using writeToFile:atomically: method of NSData.

NSData *data       = [NSJSONSerialization dataWithJSONObject:infoDictionary options:kNilOptions error:nil];
NSString *docDir   = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *filePath = [docDir stringByAppendingPathComponent:@"MyJSONFile.json"];
[data writeToFile:filePath atomically:YES];

Upvotes: 3

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