iPhone Pushing View Controller in a left direction

问题:

I have an app that has a centre view with two views off to each side of it. I want to have two navigation bar buttons, left and right which push a new navigation controller onto the view from the left or the right.

When you change views by pushing a new view using the pushviewController: method of NavigationController, the view appears to slide in from the right. how do i change this to slide in from the left?

回答1:

Instead of using a navigation controller, I would just move the view.

CGRect inFrame = [currentView frame];
CGRect outFrame = firstFrame;
outFrame.origin.x -= inFrame.size.width;

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];

[newView setFrame:inFrame];
currentView setFrame:outFrame];

[UIView commitAnimations];

回答2:

I have done change animation direction when we push viewcontroller. you can change animation type here [animation setSubtype:kCATransitionFromRight];

 ViewController *elementController = [[ViewController alloc] init];

// set the element for the controller
ViewController.element = element;


// push the element view controller onto the navigation stack to display it

CATransition *animation = [CATransition animation];
[[self navigationController] pushViewController:elementController animated:NO];
[animation setDuration:0.45];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromRight];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]];
[[elementController.view layer] addAnimation:animation forKey:@"SwitchToView1"];

[elementController release];

回答3:

I don't think you can explicitly define sliding direction in UINavigationControllers. What you might be able to do is pop the current view off the navigation stack to show the prior view, which would animate in the manner you want. However this may be complex if you want to have different view controllers appear depending on what you do on the current view.

If your workflow is not too complicated, you can hold a reference to the prior view controller in the current view controller. depending on what you do on the current view (like select a table view cell), you can change whatever data you need in the prior view controller, and then call

[self.navigationController popViewController];

or whatever the correct method is (i think that's pretty close to how it is). that would let you move down the nav stack with the animation you want, which works if your nav stack has a set number of views on it.

回答4:

to what Reed Olsen said: you must only hook up one button, that starts the slide up to the same method and add a BOOL that tracks if the view is shown or not. all you need to do is set the origin properly.

- (IBAction)slideMenuView 
{
  CGRect inFrame = [self.view frame];
  CGRect outFrame = self.view.frame;

  if (self.viewisHidden) {
    outFrame.origin.x += inFrame.size.width-50;
    self.viewisHidden = NO;
  } else {
    outFrame.origin.x -= inFrame.size.width-50;
    self.viewisHidden = YES;
  }
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:0.5];
  [self.menuView setFrame:inFrame];
  [self.view setFrame:outFrame];
  [UIView commitAnimations];
}

回答5:

To get the "pointy" type button you need to use a different method.

In your AppDelegate:

UITableViewController *first = [[RootViewController alloc] initWithStyle:UITableViewStylePlain];
UITableViewController *second = [[SomeOtherViewController alloc] initWithStyle:UITableViewStylePlain];

NSArray *stack = [NSArray arrayWithObjects: first, second, nil];

UINavigationController *nav = [[UINavigationController alloc] init];
[nav setViewControllers:stack animated:NO];

回答6:

You can inherit RTLNavigationController:UINavigationController and overwrite these functions.

 - (void) pushViewController:(UIViewController *)viewController animated:(BOOL)animated
 {
     DummyViewController*dvc = [[DummyViewController alloc] init];
     [super pushViewController:viewController animated:NO];
     [super pushViewController:dvc animated:NO];
     [dvc release];
     [super popViewControllerAnimated:YES];
}

and

- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
 UIViewController *firstViewController = [super popViewControllerAnimated:NO];
 UIViewController *viewController = [super popViewControllerAnimated:NO];
 [super pushViewController:viewController animated:animated];
 return firstViewController;
} 

And in application delegate:

navCon = [[RTLNavigationController alloc] init];

rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
rootViewController.contextDelegate = self;

DummyViewController *dvc = [[DummyViewController alloc]init];
[navCon pushViewController:dvc animated:NO];
[dvc release];

[navCon pushViewController:rootViewController animated:NO];
[self.window addSubview:navCon.view];

Pushing will be from left to right and popping from right to left