iOS - can't write to file on simulator

Question

I'n trying to save a simple .plist file to my documentsDirectory. I have followed Facebooks documentation for saving tokens and I have implemented the following methods:

static NSString* kFilename = @"TokenInfo.plist";

[...]

- (instancetype)init {
    if (self = [super init]) {
        _tokenFilePath = [self filePath];
    }

    return self;
}

- (NSString *)filePath {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths lastObject];

    return [documentsDirectory stringByAppendingPathComponent:kFilename];
}

- (void)writeData:(NSDictionary *)data {

    NSLog(@"File = %@ and Data = %@", self.tokenFilePath, data);

    BOOL success = [data writeToFile:self.tokenFilePath atomically:YES];
    if (!success) {
        NSLog(@"Error writing to file");
    }
}

I currently get NSLog(@"Error writing to file"); printed very time. Any ideas on why that is?

Answer 1

You want NSDocumentDirectory not NSDocumentationDirectory. Code completion in Xcode offers the documentation directory before the document directory enum. This is super easy to miss.

Answer 2

Also check to Documents directory exist, it's safe to create it

Add this snippet to - (NSString *)filePath method before return

NSFileManager * fm = [NSFileManager defaultManager];
NSError * err;
[fm createDirectoryAtPath: documentsDirectory withIntermediateDirectories:YES attributes:nil error:&err];
if (err)
{
    NSLog(@"%@ ", err.localizedDescription);
}