UIViewController 过渡-objective-c [英] UIViewController transition - objective-c
问题描述
我有 UIViewControllers A 和 B，它们被分配在 AppDelegate 中.我需要对他们应用过渡.如何在不重新分配和替换 UIViews 的情况下传输它们?此代码从 UINavigationController 中的 UIBarButtonItem 调用:
I have UIViewControllers A and B, they are allocated in AppDelegate. I need to apply transition to them. How to transit them without reallocating and replacing UIViews?
This code calls from my UIBarButtonItem in UINavigationController:
[UIView transitionFromView:self.view //UIViewController A
toView:appDelegate.secondViewController.view //UIViewController B
duration:0.5
options:UIViewAnimationOptionTransitionFlipFromLeft
这个方法替换了我的UIViewControllers中的UIViews，我可以把它们转回来，或者就是不知道怎么做.你能告诉我怎么做吗?
This method replaces UIViews in my UIViewControllers, and I can transit them back, or just don't know how to do that. Can you tell me how to do this?
推荐答案
如果您在 iOS 5 世界中并且想要在各种视图控制器之间跳转，您可能想要追求 查看控制器控制.或查看 WWDC 2011 session 102.
If you're in iOS 5 world and want to jump between various view controllers, you might want to pursue View Controller Containment. Or check out WWDC 2011 session 102.
视图控制器包含基本上假设您有一些父视图控制器，它控制多个子控制器之间的导航.在您的情况下，父视图将是带有导航栏和按钮的父视图.
View controller containment basically assumes that you have some parent view controller which is governing the navigation between multiple child controllers. In your case, the parent view would be one with the navigation bar with the button on it.
更新:
如果你追求遏制，你可以创建一个父视图控制器，它有一个带有按钮的导航栏.当您加载该视图时，您可以添加第一个子视图.因此 viewDidLoad 可能看起来像:
If you pursue containment, you could create a parent view controller that has a nav bar with the button on it. When you load that view, you can add the first child view. Thus viewDidLoad might look like:
- (void)viewDidLoad
{
[super viewDidLoad];
// this is my model, where I store data used by my view controllers
_model = [[MyModel alloc] init];
// let's create our first view controller
OneViewController *controller = [[OneViewController alloc] initWithNibName:@"OneViewController" bundle:nil];
// pass it our model (obviously, `model` is a property that I've set up in my child controllers)
controller.model = _model;
// let's put the new child in our container and add it to the view
[self addChildViewController:controller];
[self configureChild:controller];
[self.view addSubview:controller.view];
[controller didMoveToParentViewController:self];
// update our navigation bar title and the label of the button accordingly
[self updateTitles:controller];
}
configureChild 只是做最后的配置.为方便起见，我经常会在 IB 中设置一个 UIView(在本例中称为 childView)，用于设置框架，这让我摆脱了手动创建框架的世界，但您可以随心所欲:
The configureChild just does final configuration. As a matter of convenience, I frequently will have a UIView that I've set up in IB (in this case, called childView) which I use for setting up the frame, which gets me out of the world of manually creating frames, but you can do it any way you want:
- (void)configureChild:(UIViewController *)controller
{
// configure it to be the right size (I create a childView in IB that is convenient for setting the size of the views of our child view controllers)
controller.view.frame = self.childView.frame;
}
这是当您触摸导航栏中的按钮时的操作.如果您在第一个控制器中，请设置第二个控制器.如果您在第二个控制器中，请设置第一个:
This is the action if you touch the button in the navigation bar. If you're in the first controller, set up the second controller. If you're in the second controller, set up the first one:
- (IBAction)barButtonTouchUpInside:(id)sender
{
UIViewController *currentChildController = [self.childViewControllers objectAtIndex:0];
if ([currentChildController isKindOfClass:[OneViewController class]])
{
TwoViewController *newChildController = [[TwoViewController alloc] initWithNibName:@"TwoViewController" bundle:nil];
newChildController.model = _model;
[self transitionFrom:currentChildController To:newChildController];
}
else if ([currentChildController isKindOfClass:[TwoViewController class]])
{
OneViewController *newChildController = [[OneViewController alloc] initWithNibName:@"OneViewController" bundle:nil];
newChildController.model = _model;
[self transitionFrom:currentChildController To:newChildController];
}
else
NSAssert(FALSE, @"Unknown controller type");
}
这完成了基本的转换(包括各种与遏制相关的调用):
This does the basic transition (including the various containment related calls):
- (void)transitionFrom:(UIViewController *)oldController To:(UIViewController *)newController
{
[self addChildViewController:newController];
[self configureChild:newController];
[self transitionFromViewController:oldController
toViewController:newController
duration:0.5
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
[self updateTitles:newController];
}
completion:^(BOOL finished){
[oldController willMoveToParentViewController:nil];
[oldController removeFromParentViewController];
[newController didMoveToParentViewController:self];
}];
}
此方法只是根据选择的子视图在父视图控制器的导航栏中设置标题.它还设置按钮以引用其他控制器.
This method just sets up the title in the nav bar in our parent view controller based upon which child is selected. It also sets up the button to reference the other controller.
- (void)updateTitles:(UIViewController *)controller
{
if ([controller isKindOfClass:[OneViewController class]])
{
self.navigationItemTitle.title = @"First View Controller"; // current title
self.barButton.title = @"Two"; // title of button to take me to next controller
}
else if ([controller isKindOfClass:[TwoViewController class]])
{
self.navigationItemTitle.title = @"Second View Controller"; // current title
self.barButton.title = @"One"; // title of button to take me to next controller
}
else
NSAssert(FALSE, @"Unknown controller type");
}
这一切都假设您将在控制器之间跳转时创建和销毁控制器.我通常这样做，但使用模型对象来存储我的数据，因此我保留了我想要的任何数据.
This all assumes you are going to create and destroy controllers as you jump between them. I generally do this, but use a model object to store my data so I keep whatever data I want.
您说您不想在不重新分配和替换 UIViews"的情况下执行此操作:如果是这样，您还可以更改上面的代码以预先创建两个子视图控制器并将转换更改为简单地在它们之间跳转:
You said you don't want to do this "without reallocating and replacing UIViews": If so, you can also change the above code to create both child view controllers up-front and change the transition to be simply jump between them:
- (void)viewDidLoad
{
[super viewDidLoad];
// this is my model, where I store data used by my view controllers
_model = [[MyModel alloc] init];
// let's create our first view controller
_controller0 = [[OneViewController alloc] initWithNibName:@"OneViewController" bundle:nil];
_controller0.model = _model;
[self addChildViewController:_controller0];
[self configureChild:_controller0];
[_controller0 didMoveToParentViewController:self];
// let's create our second view controller
_controller1 = [[OneViewController alloc] initWithNibName:@"OneViewController" bundle:nil];
_controller1.model = _model;
[self addChildViewController:_controller1];
[self configureChild:_controller1];
[_controller1 didMoveToParentViewController:self];
// let's add the first view and update our navigation bar title and the label of the button accordingly
_currentChildController = _controller0;
[self.view addSubview:_currentChildController.view];
[self updateTitles:_currentChildController];
}
- (void)transitionFrom:(UIViewController *)oldController To:(UIViewController *)newController
{
[self transitionFromViewController:oldController
toViewController:newController
duration:0.5
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
[self updateTitles:newController];
}
completion:^(BOOL finished){
_currentChildController = newController;
}];
}
- (IBAction)barButtonTouchUpInside:(id)sender
{
UIViewController *newChildController;
if ([_currentChildController isKindOfClass:[OneViewController class]])
{
newChildController = _controller1;
}
else if ([_currentChildController isKindOfClass:[TwoViewController class]])
{
newChildController = _controller0;
}
else
NSAssert(FALSE, @"Unknown controller type");
[self transitionFrom:_currentChildController To:newChildController];
}
两种方式我都见过，所以你可以做任何适合你的事情.
I've seen it both ways, so you can do whatever works for you.
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