writeToFile ist nicht auf die Datei schreiben

Die Tatsache, dass writeToFile: ist ein boolescher Wert zurückgegeben, der JA einfach bedeutet, dass der Anruf beendet wird.

Sollten Sie die übergabe einer NSError** zu writeToFile: und Prüfung e.g:

 NSError *error = nil;
 BOOL ok = [hello_world writeToFile:filePath atomically:YES 
                        encoding:NSASCIIStringEncoding error:&error];
 if (error) {
      NSLog(@"Fail: %@", [error localizedDescription]);
 }

Das sollte Ihnen einen guten Anhaltspunkt über das, was schief läuft (vorausgesetzt, der Fehler ist nicht null nach dem Aufruf).

InformationsquelleAutor Mark Granoff

//I typically do something like this

//lazy instantiate a property I want such as array.
-(NSMutableArray*)array{
    if (!_array) {
        _array = [[NSMutableArray alloc]initWithContentsOfFile:self.savePath];
    }
    return _array;
}

//I'm using a class to access anything in the array from as a property from any other class
//without using NSUserDefaults.

//initializing the class
-(instancetype)init{

    self = [super init];
    if (self) {
    //creating an instance of NSError for error handling if need be.
        NSError *error;
    //build an array of locations using the NSSearchPath...  
        NSArray *locs = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
        //location 0 of array is Documents Directory which is where I want to create    the file
        NSString *docsDir = [locs objectAtIndex:0];
//my path is now just a matter of adding the file name to the docsDir
        NSString *path = [docsDir stringByAppendingPathComponent:@"fileName.plist"];
//if the file is a plist I have in my bundle I need to copy it to the docsDir to edit it

//I'll do that by getting it from the bundle that xCode made for me
        NSString *bunPath = [[NSBundle mainBundle]pathForResource:@"fileName"     ofType:@".plist"];


//now I need a NSFileManager to handle the dirty work
        NSFileManager *filemngr = [NSFileManager defaultManager];


//if the file isn't in my docsDir I can't edit so I check and if need be copy it.        
        if (![filemngr fileExistsAtPath:path]) {
            [filemngr copyItemAtPath:bunPath toPath:path error:&error];

//if an error occurs I might want to do something about it or just log it as in below.
//I believe you can set error to nil above also if you have no intentions of dealing with it.
            if (error) {
                NSLog(@"%@",[error description]);
                error = nil;

            }
//here I'm logging the paths just so you can see in the console what's going on while     building or debugging.
            NSLog(@"copied file from %@ to %@",bunPath,path);
        }

//in this case I'm assigning the array at the root of my plist for easy access
        _array = [[NSMutableArray alloc]initWithContentsOfFile:path];
        _savePath = path;//this is in my public api as well for easy access.

    }

    return self;
}

InformationsquelleAutor