writeToFile n'est pas écrit dans le fichier

Le fait que writeToFile: est de retourner une valeur booléenne OUI signifie simplement que l'appel est en train de compléter.

Vous devriez être en train de passer un NSError** à writeToFile: et de l'examen de ce, e.g:

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

Qui devrait vous donner une bonne idée de ce qui va mal (en supposant que l'erreur n'est pas nul, après l'appel).

OriginalL'auteur 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;
}

OriginalL'auteur