iOS 7应用程序因自定义转换而崩溃

Question

我正在尝试向我现有的iOS应用添加自定义转换。它似乎一直在崩溃。我的应用程序有一个主导航控制器，我已经分类。导航控制器的根控制器充当UINavigationController的委托。

PS：我也尝试使自定义导航控制器成为自己的委托，但在调用animationControllerForOperation委托方法之前它会崩溃。

这是我的代码

自定义导航控制器

@interface MainNavigationViewController : UINavigationController

@end

@implementation MainNavigationViewController


- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                    toViewController:(UIViewController *)toVC
{
   if ([fromVC isKindOfClass:[FlowLayoutCategoryController class]] && [toVC isKindOfClass:[FlowLayoutCategoryController class]]) {

        if (operation == UINavigationControllerOperationPush) {
            CategoryTransitionAnimation *animation = [CategoryTransitionAnimation new];
            animation.type = TransitionTypePush;
            return animation;
        }
        else if (operation == UINavigationControllerOperationPop) {
            CategoryTransitionAnimation *animation = [CategoryTransitionAnimation new];
            animation.type = TransitionTypePop;
            return animation;
        }
        else {
            return nil;
        }
    }
    return nil;
}

过渡动画类

typedef enum
{
    TransitionTypePush,
    TransitionTypePop
} TransitionType;

@interface CategoryTransitionAnimation : NSObject<UIViewControllerAnimatedTransitioning>

@property (nonatomic, assign) TransitionType type;

@end


#import "CategoryTransitionAnimation.h"

@implementation CategoryTransitionAnimation

#pragma mark - UIViewControllerAnimatedTransitioning

- (void) animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    //Get references to the view hierarchy
    UIView *containerView = [transitionContext containerView];
    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    if (self.type == TransitionTypePush) {
        //Add 'to' view to the hierarchy with 0.0 scale
        toViewController.view.transform = CGAffineTransformMakeScale(0.0, 0.0);
        [containerView insertSubview:toViewController.view aboveSubview:fromViewController.view];

        //Scale the 'to' view to to its final position
        [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
            toViewController.view.transform = CGAffineTransformMakeScale(1.0, 1.0);
        } completion:^(BOOL finished) {
            [transitionContext completeTransition:YES];
        }];
    } else if (self.type == TransitionTypePop) {
        //Add 'to' view to the hierarchy
        [containerView insertSubview:toViewController.view belowSubview:fromViewController.view];

        //Scale the 'from' view down until it disappears
        [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
            fromViewController.view.transform = CGAffineTransformMakeScale(0.0, 0.0);
        } completion:^(BOOL finished) {
            [transitionContext completeTransition:YES];
        }];
    }
}

- (NSTimeInterval) transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    return 1.0;
}

@end

Answer 1

我要猜测问题是你省略了一个步骤：你应该为“to”视图控制器获取finalFrameForViewController:并将视图的帧设置为该值。只是一个猜测，但我不禁注意到你没有给出任何框架的视图，这可能不是很好。