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iOS

Posted by Eric Ellenbrook
Eric Ellenbrook
9,006 Points

Ribbit Crashing on Adding Check Marks When Table View is Loaded

Alright, everything has been working great up until now. The problem is that when I click the edit friends button, the app crashes with no information. It sends me to a breakpoint at this line of code: 

if ([self isFriend:user]) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    } else {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }

I've spent the last 30 minutes trouble shooting and I did the video two times so I feel like everything is correct (I'm sure it is not, however).

I've put an NSLog in the prepareForSegue method and it logs the array just fine so the information is there. I feel like something is wrong with that method though. Also the segue identifier is correct. I have checked it at least 5 times.

I will note that up until now the app has been working perfectly. I'll add the code that I added for this exercise.

FriendsViewController.h

#import <UIKit/UIKit.h>
#import <Parse/Parse.h>

@interface FriendsViewController : UITableViewController

@property(strong, nonatomic) PFRelation *friendsRelation;
@property(strong, nonatomic) NSArray *friends;


@end

FriendsViewController.m

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([segue.identifier isEqualToString:@"showEditFriends"]) {

        EditFriendsViewController *viewController = (EditFriendsViewController *)segue.destinationViewController;
        viewController.friends = [NSMutableArray arrayWithArray:self.friends];
    }
}

EditFriendsViewController.h

#import <UIKit/UIKit.h>
#import <Parse/Parse.h>

@interface EditFriendsViewController : UITableViewController

@property(strong, nonatomic) NSArray *allUsers;
@property(strong,nonatomic) PFUser *currentUser;
@property(strong,nonatomic) NSMutableArray *friends;

-(BOOL)isFriend:(PFUser *)user;
@end

EditFriendsViewController.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    PFUser *user = [self.allUsers objectAtIndex:indexPath.row];
    cell.textLabel.text = user.username;

    if ([self isFriend:user]) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    } else {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }

    return cell;
}

and helper method

#pragma mark - Helper Methods
- (BOOL) isFriend:(PFUser *)user {
    for (PFUser *friend in self.friends) {
        if ([friend.objectId isEqualToString:user.objectId]) {
            return YES;
        }
    }
    return NO;
}

If there as anything else that you need to see I'll be monitoring this thread. I appreciate any help that anybody can give me! I'm so lost. Thanks!

Edit: Formatting

3 Answers

Eric Ellenbrook
Eric Ellenbrook
9,006 Points

I have fixed it. The breakpoint was stuck from the first time that I had the issue so it was "crashing" (stopping) every single time I ran the app. Once I deleted all breakpoints it ran perfectly. Simple but fixed. Thanks for the help everybody, I do appreciate it greatly.

James Andrews
James Andrews
7,245 Points
James Andrews
James Andrews
7,245 Points

Did you make sure the UiTableViewCell has a identifier of "Cell" in the storyboard?

Eric Ellenbrook
Eric Ellenbrook
9,006 Points

Yes, for both Friends and Edit Friends view controllers

Eric Ellenbrook
Eric Ellenbrook
9,006 Points
Eric Ellenbrook
Eric Ellenbrook
9,006 Points

I did find one error in FriendsViewController.m

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.friends.count;
}

should have been 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.friends count];
}

Unfortunately this still doesn't work. :( Any help anybody?I went through the last three videos three more times and everything is fine.