How do you transfer data between UIViewControllers?

Question

Currently I am making a game for iPhone, and want each level to be on a different uiviewcontroller (I have tried putting them all on the same view controller, but this just makes it jumpy). However, I need a way to get a high score in the level's view controller and send it back to the menu view controller. I am using the code:

SecondLevelViewController *screen = [[SecondLevelViewController alloc] initWithNibName:nil bundle:nil];
screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:screen animated:YES];
[screen release];

to get to the viewcontroller and

[self dismissModalViewControllerAnimated:YES];

to get back. I am familiar with NSUserDefaults, which are what I am using currently to get high scores. However, I know this code resets the level's view controller, that is still fine and even great because i want the level to reset-- but if just i could get data back that would be helpful.

Please put things in simple words, because I am very new to programming.

Thanks in advance!

Steve Becker

PS I am using xcode 4.0...

--------------------------------------------ALSO!!!------------------------------------- The code I am using, I can only figure out how to get transitions "FlipHorizontal", "CoverVertical", and "CrossDissolve"...But I have seen many other cool transitions on the iPhone--like the page corner flipping like a page in a book. If you know how to do these other transitions, please tell me!!!! Greatly appreciated!!!!!

score 1 · Answer 1 · answered Mar 28 '11 at 17:53

1

You will want to use delegation or NSNotifications for this.

answered Mar 28 '11 at 17:53

Joe

56,979
9
128
135

score 1 · Accepted Answer · answered Mar 28 '11 at 17:58

It's much more standard to have all of the levels on the same UIViewController unless the logic is so different that it's like playing different games. However, you could use a whole slew of different methods to achieve this. For example, you could use the NSNotificationCenter, NSUserDefaults, or a plist.

score 1 · Answer 3 · edited May 23 '17 at 09:58

1

you could also use a singleton class to modify and access the sharable data in any class of your projects,

Here is the good SO post on singleton class in objective - C

Singleton shared data source in Objective-C

Edited:

What should my Objective-C singleton look like?

Edited: for Curl page animation : below is the link to blog tutorial and the source code.

http://blog.steventroughtonsmith.com/2010/02/apples-ibooks-dynamic-page-curl.html

edited May 23 '17 at 09:58

Community

1
1

answered Mar 28 '11 at 18:05

Jhaliya - Praveen Sharma

31,697
9
72
76

:) i was just writing this, you surpassed me by seconds. – Marko Hlebar Mar 28 '11 at 18:13
@KakoSquid: anytime Dude :) :) – Jhaliya - Praveen Sharma Mar 28 '11 at 18:15
@Steve Becker : Check my updated answer for curl page animation – Jhaliya - Praveen Sharma Mar 28 '11 at 18:17

score 1 · Answer 4 · edited May 23 '17 at 11:55

1

Think about the different view controllers like the mafia: every view controller is operating on a need-to-know basis.

Look at this answer I gave before.

edited May 23 '17 at 11:55

Community

1
1

answered Mar 28 '11 at 18:14

GorillaPatch

5,007
1
39
56

How do you transfer data between UIViewControllers?

4 Answers4