Adding strings to an array in for loop and not overwrite the value in objective-c

Question

I define a NSMutableArray *nameArray in .h file. And add strings using this nameArray in a for loop in .m file like below:

for (int i=0; i<[data count]; i++) {        
  NSDictionary* place = [data objectAtIndex:i];        
  NSString *name=[place objectForKey:@"name"];        
  _nameArray = [[NSMutableArray alloc] init];
  [_nameArray addObject:name];
}        
NSLog(@"After loop, Name is %@", _nameArray);

Actually, it should have several names in this array. But why it only output one name which was added in the array last?

Seega · Accepted Answer · 2014-08-05 12:44:12Z

2

You must create your array outside the loop, that is your problem.

// Init array
_nameArray = [[NSMutableArray alloc] init];
// Fill array
for (int i=0; i<[data count]; i++) {        
  NSDictionary* place = [data objectAtIndex:i];        
  NSString *name=[place objectForKey:@"name"];  
  [_nameArray addObject:name];
}   
// Log array     
NSLog(@"After loop, Name is %@", _nameArray);

All of your objects are added to an own array and only the last array will not be overwritten and is therefore in the log.

answered Aug 5, 2014 at 12:44

Seega

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