fast enumeration on a NSArray / NSMutableArray returned from block

Question

I have the following in a success block for an AFNetworking getPath call:

+(void)allItemsWithBlock: (void (^)(NSArray *items)) block
{
   ...
   NSMutableArray *mutableItems = [NSMutableArray array];
   for (NSDictionary *attributes in [responseObject valueForKey:@"data"]) {
      Item *item = [[Item alloc] initWithAttributes:attributes];
      [mutableItems addObject:item];
   } 
   NSLog(@"here is a count: %i", [mutableItems count]);
   if(block){
      block(mutableItems);
   }

and in the block that gets passed in, I have the following but get the error listed as a comment:

[Item allItemsWithBlock:^(NSArray *items){
    for(Item *thisItem in *items){  // The type 'NSArray' is not a pointer to a fast-enumerable object
      NSLog(@"in the block here");
    }
}];

I've read up on trying to fast-enumeration but am not sure what the problem is. Is the NSMutableArray -> NSArray an issue? Is it because this array is created in a block and thus could be seen as possibly still 'open for change'? I have seen code like this before in our projects and doesn't seem to be a problem.

thx for any help

Don't prefix methods w/get, please. That is reserved for a very special purpose. — bbum
– bbum, Commented Aug 12, 2013 at 0:49
To be more specific, get is typically used when the caller must provide their own buffer. For example, NSString has a method getCharacters:range: where the caller must provide a buffer. Similarly, NSArray has a method called getObjects:range:. Another example, NSStream has a class method getStreamsToHost:port:inputStream:outputStream: where the method returns two streams via "output" parameters. — dreamlax
– dreamlax, Commented Aug 12, 2013 at 1:04

Jsdodgers · Accepted Answer · 2013-08-12 00:24:18Z

6

This is because NSArray *items is already a pointer to an array, *items is trying to find a pointer to a pointer, which it is not.

Just replace:

for(Item *thisItem in *items){

with:

for(Item *thisItem in items){

answered Aug 12, 2013 at 0:24

Jsdodgers

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