Question

I read the similar problems and solutions regarding this issue, but it didn’t help me. Let’s say, I’ve got 3 UIViewControlers app.

1. At view #2 I placed a picture (.png) red/green (on/off). An int getting retrieved from db, if 1=green else red. It works fine for me.

2. At view #3, I am using UISwitcher to switch the int to values 1 or 0. It also doing well.

The problem. When I am pushing back to view #2 from #3, the picture stays unchanged. And only after pushing to view #1 and back to view #2, I’m getting the image changed.

The data getting retrieved in - (void)viewDidLoad method.

What I tried to do meanwhile:

Have added method - (void)viewWillAppear:(BOOL)animated

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.tableView reloadData];
}

Also I tried to call database method in - (void)viewWillAppear:(BOOL)animated.

Alas, it doesn’t help.

Thank you for reading this and helping me.

Answer 1

Make the view 2 register to get notification for int value changed..and in view 3 ..when you change int..post the notification using [NSNotification defaultcenter]

1) In viewDidLoad of View 2

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(intChanged) name:@"Int Changed" object:nil];

2) In Dealloc of view 2

 [[NSNotificationCenter defaultCenter] removeObserver:self];

3) In view 3 ..when you change int after that put this line

[[NSNotificationCenter defaultCenter] postNotificationName:@"Int Changed" object:nil userInfo:nil];

In the end..intChanged method(in view 2) will be called when int value is changed in view 3 make sure you define a method intChanged in view 2