小贝子编程

视图控制器在取消被呈现视图控制器的交互式解除转换后不会自动旋转



我有一个视图控制器用modalPresentationStyle = UIModalPresentationCustom呈现另一个视图控制器。设置好后，呈现视图控制器视图的一部分会显示在呈现视图控制器视图的下面。在这种状态下，呈现的视图控制器仍然正确地处理自动旋转，我使用自动布局来处理呈现的视图控制器的旋转。

我现在正在尝试使用iOS 7的自定义视图控制器转换API实现交互式地解散呈现的视图控制器。它的工作原理是，当交互式解雇被取消时，自动旋转处理停止工作。(它在稍后被呈现的视图控制器被驳回后再次工作。)为什么会发生这种情况，我该如何解决?

EDIT: 您可以运行以下代码来演示该问题。一个视图从下面弹出，你可以通过向下滑动来关闭它。如果你通过不向下滑动来取消解雇，呈现视图控制器的视图不再响应旋转，并且呈现视图控制器的视图布局混乱。

EDIT:下面是Xcode项目的代码链接:https://drive.google.com/file/d/0BwcBqUuDfCG2YlhVWE1QekhUWlk/edit?usp=sharing

很抱歉大量的代码转储，但我不知道我做错了什么。这里有一个示意图:ViewController1呈现ViewController2。ViewController1实现了UIViewControllerTransitioningDelegate，所以它为过渡返回动画/交互控制器。ViewController2具有驱动交互式解雇的泛手势识别器;实现UIViewControllerInteractiveTransitioning作为解雇交互控制器。它还保留了一个对动画控制器的引用，以便在用户将视图拖到足够低的位置时完成转换。最后，有两个动画控制器对象。PresentAnimationController设置自动布局约束来处理呈现的视图控制器的视图的旋转，DismissAnimationController完成解散。

ViewController1.h 

#import <UIKit/UIKit.h>
@interface ViewController1 : UIViewController <UIViewControllerTransitioningDelegate>
@end

ViewController1.m 

#import "ViewController1.h"
#import "ViewController2.h"
#import "PresentAnimationController.h"
#import "DismissAnimationController.h"
@implementation ViewController1
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = @"View 1";
        self.navigationItem.prompt = @"Press “Present” and then swipe down to dismiss.";
        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Present" style:UIBarButtonItemStylePlain target:self action:@selector(pressedPresentButton:)];
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    // Some subview just to check if layout is working.
    UIView * someSubview = [[UIView alloc] initWithFrame:self.view.bounds];
    someSubview.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    someSubview.backgroundColor = [UIColor orangeColor];
    someSubview.layer.borderColor = [UIColor redColor].CGColor;
    someSubview.layer.borderWidth = 2;
    [self.view addSubview:someSubview];
}
// --------------------
- (void)pressedPresentButton:(id)sender
{
    ViewController2 * presentedVC = [[ViewController2 alloc] initWithNibName:nil bundle:nil];
    presentedVC.modalPresentationStyle = UIModalPresentationCustom;
    presentedVC.transitioningDelegate = self;
    [self presentViewController:presentedVC animated:YES completion:nil];
}
// --------------------
// View Controller Transitioning Delegate Methods.
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
    return [[PresentAnimationController alloc] init];;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
    DismissAnimationController * animationController = [[DismissAnimationController alloc] init];
    ViewController2 * presentedVC = (ViewController2 *)self.presentedViewController;
    if (presentedVC.dismissalIsInteractive) {
        presentedVC.dismissAnimationController = animationController;
    }
    return animationController;
}
- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator
{
    return nil;
}
- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator
{
    ViewController2 * presentedVC = (ViewController2 *)self.presentedViewController;
    if (presentedVC.dismissalIsInteractive) {
        return presentedVC;
    }
    else {
        return nil;
    }
}
@end

ViewController2.h 

#import <UIKit/UIKit.h>
#import "DismissAnimationController.h"
@interface ViewController2 : UIViewController <UIViewControllerInteractiveTransitioning>
@property (weak, nonatomic) UIView * contentView;
@property (nonatomic, readonly) BOOL dismissalIsInteractive;
@property (strong, nonatomic) DismissAnimationController * dismissAnimationController;
@end

ViewController2.m 

#import "ViewController2.h"
@interface ViewController2 ()
@property (strong, nonatomic) id<UIViewControllerContextTransitioning> transitionContext;
@end
@implementation ViewController2
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        _dismissalIsInteractive = NO;
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
    // Set up content view.
    CGRect frame = UIEdgeInsetsInsetRect(self.view.bounds, UIEdgeInsetsMake(15, 15, 15, 15));
    UIView * contentView = [[UIView alloc] initWithFrame:frame];
    self.contentView = contentView;
    contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    contentView.backgroundColor = [UIColor cyanColor];
    contentView.layer.borderColor = [UIColor blueColor].CGColor;
    contentView.layer.borderWidth = 2;
    [self.view addSubview:contentView];
    // Set up pan dismissal gesture recognizer.
    UIPanGestureRecognizer * panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dismissalPan:)];
    [self.view addGestureRecognizer:panGesture];
}
// --------------------
- (void)dismissalPan:(UIPanGestureRecognizer *)panGesture
{
    switch (panGesture.state) {
        case UIGestureRecognizerStateBegan: {
            _dismissalIsInteractive = YES;
            [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
            break;
        }
        case UIGestureRecognizerStateChanged: {
            CGPoint translation = [panGesture translationInView:self.view];
            CGFloat percent;
            if (translation.y > 0) {
                percent = translation.y / self.view.bounds.size.height;
                percent = MIN(percent, 1.0);
            }
            else {
                percent = 0;
            }
            // Swiping content view down.
            CGPoint center;
            center.x = CGRectGetMidX(self.view.bounds);
            center.y = CGRectGetMidY(self.view.bounds);
            if (translation.y > 0) {
                center.y += translation.y;  // Only allow swiping down.
            }
            self.contentView.center = center;
            self.view.backgroundColor = [UIColor colorWithWhite:0 alpha:(0.5 * (1.0 - percent))];
            [self.transitionContext updateInteractiveTransition:percent];
            break;
        }
        case UIGestureRecognizerStateEnded: // Fall through.
        case UIGestureRecognizerStateCancelled: {
            _dismissalIsInteractive = NO;
            id<UIViewControllerContextTransitioning> transitionContext = self.transitionContext;
            self.transitionContext = nil;
            DismissAnimationController * dismissAnimationController = self.dismissAnimationController;
            self.dismissAnimationController = nil;
            CGPoint translation = [panGesture translationInView:self.view];
            if (translation.y > 100) {
                // Complete dismissal.
                [dismissAnimationController animateTransition:transitionContext];
            }
            else {
                // Cancel dismissal.
                void (^animations)() = ^() {
                    CGPoint center;
                    center.x = CGRectGetMidX(self.view.bounds);
                    center.y = CGRectGetMidY(self.view.bounds);
                    self.contentView.center = center;
                    self.view.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
                };
                void (^completion)(BOOL) = ^(BOOL finished) {
                    [transitionContext cancelInteractiveTransition];
                    [transitionContext completeTransition:NO];
                };
                [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:animations completion:completion];
            }
            break;
        }
        default: {
            break;
        }
    }
}
// --------------------
// View Controller Interactive Transitioning Methods.
- (void)startInteractiveTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    self.transitionContext = transitionContext;
}
@end

PresentAnimationController.h 

#import <Foundation/Foundation.h>
@interface PresentAnimationController : NSObject <UIViewControllerAnimatedTransitioning>
@end

PresentAnimationController.m 

#import "PresentAnimationController.h"
#import "ViewController2.h"
@implementation PresentAnimationController
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
    UIViewController * fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    ViewController2 * toVC = (ViewController2 *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView * containerView = [transitionContext containerView];
    CGPoint toCenter = fromVC.view.center;
    CGRect toBounds = fromVC.view.bounds;
    toVC.view.center = toCenter;
    toVC.view.bounds = toBounds;
    [toVC.view layoutIfNeeded];
    [containerView addSubview:fromVC.view];
    [containerView addSubview:toVC.view];
    CGRect contentViewEndFrame = toVC.contentView.frame;
    CGRect contentViewStartFrame = contentViewEndFrame;
    contentViewStartFrame.origin.y += contentViewStartFrame.size.height;
    toVC.contentView.frame = contentViewStartFrame;
    UIColor * endBackgroundColor = toVC.view.backgroundColor;
    toVC.view.backgroundColor = [UIColor clearColor];
    void (^animations)() = ^() {
        toVC.contentView.frame = contentViewEndFrame;
        toVC.view.backgroundColor = endBackgroundColor;
    };
    void (^completion)(BOOL) = ^(BOOL finished) {
        toVC.view.autoresizingMask = UIViewAutoresizingNone;
        toVC.view.translatesAutoresizingMaskIntoConstraints = NO;
        NSLayoutConstraint * centerXConstraint = [NSLayoutConstraint constraintWithItem:toVC.view
                                                                              attribute:NSLayoutAttributeCenterX
                                                                              relatedBy:NSLayoutRelationEqual
                                                                                 toItem:fromVC.view
                                                                              attribute:NSLayoutAttributeCenterX
                                                                             multiplier:1
                                                                               constant:0];
        NSLayoutConstraint * centerYConstraint = [NSLayoutConstraint constraintWithItem:toVC.view
                                                                              attribute:NSLayoutAttributeCenterY
                                                                              relatedBy:NSLayoutRelationEqual
                                                                                 toItem:fromVC.view
                                                                              attribute:NSLayoutAttributeCenterY
                                                                             multiplier:1
                                                                               constant:0];
        NSLayoutConstraint * widthConstraint = [NSLayoutConstraint constraintWithItem:toVC.view
                                                                            attribute:NSLayoutAttributeWidth
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:fromVC.view
                                                                            attribute:NSLayoutAttributeWidth
                                                                           multiplier:1
                                                                             constant:0];
        NSLayoutConstraint * heightConstraint = [NSLayoutConstraint constraintWithItem:toVC.view
                                                                             attribute:NSLayoutAttributeHeight
                                                                             relatedBy:NSLayoutRelationEqual
                                                                                toItem:fromVC.view
                                                                             attribute:NSLayoutAttributeHeight
                                                                            multiplier:1
                                                                              constant:0];
        [containerView addConstraint:centerXConstraint];
        [containerView addConstraint:centerYConstraint];
        [containerView addConstraint:widthConstraint];
        [containerView addConstraint:heightConstraint];
        [transitionContext completeTransition:YES];
    };
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:animations completion:completion];
}
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5;
}
@end

DismissAnimationController.h 

#import <Foundation/Foundation.h>
@interface DismissAnimationController : NSObject <UIViewControllerAnimatedTransitioning>
@end

DismissAnimationController.m 

#import "DismissAnimationController.h"
#import "ViewController2.h"
@implementation DismissAnimationController
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
    ViewController2 * fromVC = (ViewController2 *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController * toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView * containerView = [transitionContext containerView];
    [containerView addSubview:toVC.view];
    [containerView addSubview:fromVC.view];
    void (^animations)() = ^() {
        CGRect contentViewEndFrame = fromVC.contentView.frame;
        contentViewEndFrame.origin.y = CGRectGetMaxY(fromVC.view.bounds) + 15;
        fromVC.contentView.frame = contentViewEndFrame;
        fromVC.view.backgroundColor = [UIColor clearColor];
    };
    void (^completion)(BOOL) = ^(BOOL finished) {
        if ([transitionContext isInteractive]) {
            [transitionContext finishInteractiveTransition];
        }
        [transitionContext completeTransition:YES];
    };
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveLinear animations:animations completion:completion];
}
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5;
}
@end

AppDelegate.m 

#import "AppDelegate.h"
#import "ViewController1.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    ViewController1 * vc = [[ViewController1 alloc] initWithNibName:nil bundle:nil];
    UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:vc];
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];
    return YES;
}
@end

我想我找到你的问题了。在你的PresentAnimationController。m您指定toVC.view.translatesAutoresizingMaskIntoConstraints = NO;，并在您设置的完成块中设置所有约束- (void)animateTransition:

注释行和所有的约束和addConstraint:调用，它应该工作

编辑:

刚才看到它只在取消手势时工作，而不是在视图初始显示时工作。注释掉完成块中的所有内容，除了

[transitionContext completeTransition:YES];

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