是的，自定义容器视图是可行的方法（iOS 5 及更高版本）。您基本上编写自己的自定义容器，使用内置的childViewControllers 属性来跟踪所有子视图控制器。您可能希望自己的属性（例如 currentChildIndex）来跟踪您当前使用的子控制器：
@property (nonatomic) NSInteger currentChildIndex;
你的父控制器可能应该有一些非滑动相关导航的推送和弹出方法，例如：
- (void)pushChildViewController:(UIViewController *)newChildController
{
// remove any other children that we've popped off, but are still lingering about
for (NSInteger index = [self.childViewControllers count] - 1; index > self.currentChildIndex; index--)
{
UIViewController *childController = self.childViewControllers[index];
[childController willMoveToParentViewController:nil];
[childController.view removeFromSuperview];
[childController removeFromParentViewController];
}
// get reference to the current child controller
UIViewController *currentChildController = self.childViewControllers[self.currentChildIndex];
// set new child to be off to the right
CGRect frame = self.containerView.bounds;
frame.origin.x += frame.size.width;
newChildController.view.frame = frame;
// add the new child
[self addChildViewController:newChildController];
[self.containerView addSubview:newChildController.view];
[newChildController didMoveToParentViewController:self];
[UIView animateWithDuration:0.5
animations:^{
CGRect frame = self.containerView.bounds;
newChildController.view.frame = frame;
frame.origin.x -= frame.size.width;
currentChildController.view.frame = frame;
}];
self.currentChildIndex++;
}
- (void)popChildViewController
{
if (self.currentChildIndex == 0)
return;
UIViewController *currentChildController = self.childViewControllers[self.currentChildIndex];
self.currentChildIndex--;
UIViewController *previousChildController = self.childViewControllers[self.currentChildIndex];
CGRect onScreenFrame = self.containerView.bounds;
CGRect offToTheRightFrame = self.containerView.bounds;
offToTheRightFrame.origin.x += offToTheRightFrame.size.width;
[UIView animateWithDuration:0.5
animations:^{
currentChildController.view.frame = offToTheRightFrame;
previousChildController.view.frame = onScreenFrame;
}];
}
就我个人而言，我为这两种方法定义了一个协议，并确保我的父控制器配置为符合该协议：
@protocol ParentControllerDelegate <NSObject>
- (void)pushChildViewController:(UIViewController *)newChildController;
- (void)popChildViewController;
@end
@interface ParentViewController : UIViewController <ParentControllerDelegate>
...
@end
然后，当一个孩子想推一个新的孩子时，它可以这样做：
ChildViewController *controller = ... // instantiate and configure your next controller however you want to do that
id<ParentControllerDelegate> parent = (id)self.parentViewController;
NSAssert([parent conformsToProtocol:@protocol(ParentControllerDelegate)], @"Parent must conform to ParentControllerDelegate");
[parent pushChildViewController:controller];
当一个孩子想跳出来时，它可以这样做：
id<ParentControllerDelegate> parent = (id)self.parentViewController;
NSAssert([parent conformsToProtocol:@protocol(ParentControllerDelegate)], @"Parent must conform to ParentControllerDelegate");
[parent popChildViewController];
然后父视图控制器设置了平移手势，以处理用户从一个孩子平移到另一个孩子：
- (void)handlePan:(UIPanGestureRecognizer *)gesture
{
static UIView *currentView;
static UIView *previousView;
static UIView *nextView;
if (gesture.state == UIGestureRecognizerStateBegan)
{
// identify previous view (if any)
if (self.currentChildIndex > 0)
{
UIViewController *previous = self.childViewControllers[self.currentChildIndex - 1];
previousView = previous.view;
}
else
{
previousView = nil;
}
// identify next view (if any)
if (self.currentChildIndex < ([self.childViewControllers count] - 1))
{
UIViewController *next = self.childViewControllers[self.currentChildIndex + 1];
nextView = next.view;
}
else
{
nextView = nil;
}
// identify current view
UIViewController *current = self.childViewControllers[self.currentChildIndex];
currentView = current.view;
}
// if we're in the middle of a pan, let's adjust the center of the views accordingly
CGPoint translation = [gesture translationInView:gesture.view.superview];
previousView.transform = CGAffineTransformMakeTranslation(translation.x, 0.0);
currentView.transform = CGAffineTransformMakeTranslation(translation.x, 0.0);
nextView.transform = CGAffineTransformMakeTranslation(translation.x, 0.0);
// if we're all done, let's animate the completion (or if we didn't move far enough,
// the reversal) of the pan gesture
if (gesture.state == UIGestureRecognizerStateEnded ||
gesture.state == UIGestureRecognizerStateCancelled ||
gesture.state == UIGestureRecognizerStateFailed)
{
CGPoint center = currentView.center;
CGPoint currentCenter = CGPointMake(center.x + translation.x, center.y);
CGPoint offRight = CGPointMake(center.x + currentView.frame.size.width, center.y);
CGPoint offLeft = CGPointMake(center.x - currentView.frame.size.width, center.y);
CGPoint velocity = [gesture velocityInView:gesture.view.superview];
if ((translation.x + velocity.x * 0.5) < (-self.containerView.frame.size.width / 2.0) && nextView)
{
// if we finished pan to left, reset transforms
previousView.transform = CGAffineTransformIdentity;
currentView.transform = CGAffineTransformIdentity;
nextView.transform = CGAffineTransformIdentity;
// set the starting point of the animation to pick up from where
// we had previously transformed the views
CGPoint nextCenter = CGPointMake(nextView.center.x + translation.x, nextView.center.y);
currentView.center = currentCenter;
nextView.center = nextCenter;
// and animate the moving of the views to their final resting points,
// adjusting the currentChildIndex appropriately
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
currentView.center = offLeft;
nextView.center = center;
self.currentChildIndex++;
}
completion:NULL];
}
else if ((translation.x + velocity.x * 0.5) > (self.containerView.frame.size.width / 2.0) && previousView)
{
// if we finished pan to right, reset transforms
previousView.transform = CGAffineTransformIdentity;
currentView.transform = CGAffineTransformIdentity;
nextView.transform = CGAffineTransformIdentity;
// set the starting point of the animation to pick up from where
// we had previously transformed the views
CGPoint previousCenter = CGPointMake(previousView.center.x + translation.x, previousView.center.y);
currentView.center = currentCenter;
previousView.center = previousCenter;
// and animate the moving of the views to their final resting points,
// adjusting the currentChildIndex appropriately
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
currentView.center = offRight;
previousView.center = center;
self.currentChildIndex--;
}
completion:NULL];
}
else
{
[UIView animateWithDuration:0.25
delay:0.0
options:UIViewAnimationOptionCurveEaseInOut
animations:^{
previousView.transform = CGAffineTransformIdentity;
currentView.transform = CGAffineTransformIdentity;
nextView.transform = CGAffineTransformIdentity;
}
completion:NULL];
}
}
}
看起来您是在进行上下平移，而不是我上面使用的左右平移，但希望您了解基本概念。
顺便说一句，在 iOS 6 中，您所询问的用户界面（使用手势在视图之间滑动）可能可以使用内置容器控制器 UIPageViewController 更有效地完成。只需使用UIPageViewControllerTransitionStyleScroll 的过渡样式和UIPageViewControllerNavigationOrientationHorizontal 的导航方向。不幸的是，iOS 5 只允许页面卷曲过渡，Apple 只在 iOS 6 中引入了你想要的滚动过渡，但如果这就是你所需要的，UIPageViewController 比我上面列出的更有效地完成工作（您无需进行任何自定义容器调用，无需编写手势识别器等）。
例如，您可以将“页面视图控制器”拖到故事板上，创建UIPageViewController 子类，然后在viewDidLoad 中，您需要配置第一页：
UIViewController *firstPage = [self.storyboard instantiateViewControllerWithIdentifier:@"1"]; // use whatever storyboard id your left page uses
self.viewControllerStack = [NSMutableArray arrayWithObject:firstPage];
[self setViewControllers:@[firstPage]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
self.dataSource = self;
那么你需要定义以下UIPageViewControllerDataSource方法：
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
if ([viewController isKindOfClass:[LeftViewController class]])
return [self.storyboard instantiateViewControllerWithIdentifier:@"2"];
return nil;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
if ([viewController isKindOfClass:[RightViewController class]])
return [self.storyboard instantiateViewControllerWithIdentifier:@"1"];
return nil;
}
您的实现会有所不同（至少不同的类名和不同的故事板标识符；我还让页面视图控制器在用户请求时实例化下一页的控制器，因为我没有保留任何强引用对他们来说，当我完成转换到另一个页面时，它们将被释放......您也可以在启动时实例化它们，然后这些 before 和 after 例程显然不会实例化，而是查找它们在一个数组中），但希望你明白这一点。
但关键问题是我没有任何手势代码，没有自定义容器视图控制器代码等。要简单得多。