iCloud Document Storage with UIDocument - Beginning iOS Cloud and Database Development - page 66

We start out by adding a pragma mark so we can quickly find these methods from the jump bar.
The first method we implement is collectionView:numberOfItemsInSection . Because we are only
going to have one section, and our entries array will contain all the entries for that section, we just
pass back the total number of entries we have by using the count method on our array.
Then we implement the numberOfSectionsInCollectionView : method. Again, we are only going to
have one section so we send it back a value of 1.
The final method is collectionView:cellForItemAtIndexPath: . We start out by pulling out a
EntryCollectionViewCell from the collection view by calling dequeueReusableCellWithReuseId
entifier:forIndexPath :. This method returns either a new instantiated cell or a dequeued cell that
has been prepared for reuse. Once we have the cell, we determine what entry we are concerned with
by calling _entries[indexPath.row] to pull our entry out of the entries array. Then we call our helper
method configureCellForEntry:withDelegate : and pass in the entry and ourselves as the delegate.
Finally we return our configured cell.
The next thing we want to do is add our UICollectionViewDelegate Methods. We are actually only
concerned with one method here which is the collectionView:didSelectItemAtIndexPath :.
#pragma mark - UICollectionViewDelegateFlowLayout Methods
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)
indexPath {
NSString *entry = _entries[indexPath.row];
_selectedEntry = entry;
_shouldStartEditing = NO;
[self performSegueWithIdentifier:@"ToFriendDetails" sender:nil];
}
We first get the selected entry by using the indexPath variable passed to us. We assign that entry to
_ selectedEntry . We then set the _ shouldStartEditing variable to NO since this is not a brand new
entry. Finally, we call performSegueWithIdentifier:sender: and pass it ToFriendDetails and nil as
the parameters.
Now let's add the prepareForSegue :sender: method. We won't do anything in this method except
add an if statement if the segue identifier is ToFriendDetails . This is just a stub right now, but we
will update it after we get the FriendDetailViewController written.
#pragma mark - Navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:@"ToFriendDetails"]){
}
}