2

据我所知，不可能将 View Controller 动画用作 Segue 转换。目前，我在现有项目中有一组视图控制器动画，用于在视图控制器之间创建动画转换。例如：

模态动画 .h 文件：

//
//  MVModalDismissAnimation.h
//

#import "MVBaseAnimation.h"

@interface MVModalAnimation : MVBaseAnimation

@end

模态动画 .m 文件：

//
//  MVModalDismissAnimation.m
//

#import "MVModalAnimation.h"

@implementation MVModalAnimation {
UIView *_coverView;
NSArray *_constraints;
}

#pragma mark - Animated Transitioning

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
//The view controller's view that is presenting the modal view
UIView *containerView = [transitionContext containerView];

if (self.type == AnimationTypePresent) {
    //The modal view itself
    UIView *modalView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;

    //View to darken the area behind the modal view
    if (!_coverView) {
        _coverView = [[UIView alloc] initWithFrame:containerView.frame];
        _coverView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.6];
        _coverView.alpha = 0.0;
    } else _coverView.frame = containerView.frame;
    [containerView addSubview:_coverView];

    //Using autolayout to position the modal view
    modalView.translatesAutoresizingMaskIntoConstraints = NO;
    [containerView addSubview:modalView];
    NSDictionary *views = NSDictionaryOfVariableBindings(containerView, modalView);
    _constraints = [[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-30-[modalView]-30-|" options:0 metrics:nil views:views] arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-30-[modalView]-30-|" options:0 metrics:nil views:views]];
    [containerView addConstraints:_constraints];

    //Move off of the screen so we can slide it up
    CGRect endFrame = modalView.frame;
    modalView.frame = CGRectMake(endFrame.origin.x, containerView.frame.size.height, endFrame.size.width, endFrame.size.height);
    [containerView bringSubviewToFront:modalView];

    //Animate using spring animation
    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 usingSpringWithDamping:0.8 initialSpringVelocity:1.0 options:0 animations:^{
        modalView.frame = endFrame;
        _coverView.alpha = 1.0;
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
    }];
} else if (self.type == AnimationTypeDismiss) {
    //The modal view itself
    UIView *modalView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;

    //Grab a snapshot of the modal view for animating
    UIView *snapshot = [modalView snapshotViewAfterScreenUpdates:NO];
    snapshot.frame = modalView.frame;
    [containerView addSubview:snapshot];
    [containerView bringSubviewToFront:snapshot];
    [modalView removeFromSuperview];

    //Set the snapshot's anchor point for CG transform
    CGRect originalFrame = snapshot.frame;
    snapshot.layer.anchorPoint = CGPointMake(0.0, 1.0);
    snapshot.frame = originalFrame;

    //Animate using keyframe animation
    [UIView animateKeyframesWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:0 animations:^{
        [UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.15 animations:^{
            //90 degrees (clockwise)
            snapshot.transform = CGAffineTransformMakeRotation(M_PI * -1.5);
        }];
        [UIView addKeyframeWithRelativeStartTime:0.15 relativeDuration:0.10 animations:^{
            //180 degrees
            snapshot.transform = CGAffineTransformMakeRotation(M_PI * 1.0);
        }];
        [UIView addKeyframeWithRelativeStartTime:0.25 relativeDuration:0.20 animations:^{
            //Swing past, ~225 degrees
            snapshot.transform = CGAffineTransformMakeRotation(M_PI * 1.3);
        }];
        [UIView addKeyframeWithRelativeStartTime:0.45 relativeDuration:0.20 animations:^{
            //Swing back, ~140 degrees
            snapshot.transform = CGAffineTransformMakeRotation(M_PI * 0.8);
        }];
        [UIView addKeyframeWithRelativeStartTime:0.65 relativeDuration:0.35 animations:^{
            //Spin and fall off the corner
            //Fade out the cover view since it is the last step
            CGAffineTransform shift = CGAffineTransformMakeTranslation(180.0, 0.0);
            CGAffineTransform rotate = CGAffineTransformMakeRotation(M_PI * 0.3);
            snapshot.transform = CGAffineTransformConcat(shift, rotate);
            _coverView.alpha = 0.0;
        }];
    } completion:^(BOOL finished) {
        [_coverView removeFromSuperview];
        [containerView removeConstraints:_constraints];
        [transitionContext completeTransition:YES];
    }];
}
}

-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
if (self.type == AnimationTypePresent) return 1.0;
else if (self.type == AnimationTypeDismiss) return 1.75;
else return [super transitionDuration:transitionContext];
}

@end

上面从底部向上滑动了一个模态视图控制器。

我现在想将其转换为与故事板和转场一起使用。

我有四种其他类型的动画要转换，那么有没有一种简单的方法可以使上述类与 segue 转换一起使用？

4

2 回答 2

3

我可能会误解你，但这是一个与自定义 segue 一起使用的 segue 示例......

@interface TestSegue : UIStoryboardSegue

@end

@implementation TestSegue
-(void)perform
    {
    UIView *sv = ((UIViewController *)self.sourceViewController).view;
    UIView *dv = ((UIViewController *)self.destinationViewController).view;

    UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
    [window insertSubview:dv aboveSubview:sv];
    [dv enterRight:0.1 then:^
        {
        [self.sourceViewController
           presentViewController:self.destinationViewController
           animated:NO completion:nil];
        }];
    
    }
@end

请注意我的例程“enterRight:”只是 UIView 上的一个类别

使用自定义 segues 的便捷教程 ... http://www.bencz.com/hacks/2014/02/07/custom-ios-segues-in-xcode-5/

我在 UIView 上的类别的一个例子，它只是一个视图的移动动画......

请注意，您必须并且必须有一个“之后”块，才能在自定义 segue 中使用它。

注意 - 对于不熟悉https://stackoverflow.com/a/20760583/294884的任何人，这里有一个关于将块作为属性的完整解释

-(void)enterRight:(float)delay then:(void(^)(void))after
    {
    CGPoint moveTo = self.center;
    CGPoint moveFrom = self.center;
    
    CGFloat simpleOffscreen = [UIScreen mainScreen].bounds.size.width;
    
    moveFrom.x = moveFrom.x + simpleOffscreen;
    
    self.center = moveFrom;
    self.hidden = NO;
    
    [UIView animateWithDuration:0.5
        delay:delay
        usingSpringWithDamping:0.4
        initialSpringVelocity:0.1
        options:0
        animations:^
            {
            self.center = moveTo;
            }
        completion:^(BOOL finished)
            {
            if (after) after();
            }
        ];
    }

所以，如果你从类别开始......

在 Xcode 中单击添加一个新文件，然后选择类别。有两个盒子。

所以，一个类别是“在”某个类。在这种情况下，它是“打开”的 UIView。在底部框中，输入 UIView。

在顶部框中，简单地输入一些方便、简短的名称。事实上，使用的名称并不重要。例如，典型的选择是“实用程序”“助手”“技巧”“动漫”或类似的。

现在转到 .h 文件并添加这个

-(void)enterRight:(float)delay then:(void(^)(void))after;

现在转到 .m 文件并准确添加上面的函数。您现在可以在代码中的任何位置使用该函数。这是一个使用它的例子

-(void)viewDidLoad
    {
    [super viewDidLoad];
    [PFAnalytics trackEvent:@"harvestFBPage"];
    
    [self.slideOff showMessage:@"Next step..."];
    [self.slideOff enterRight:0.0 then:nil];
    }

所以，使用任何 UIView，你都可以去[anyUIView enterRight...];，这很棒。在示例中 self.slideOff 是一个 UIView。

请注意，在该示例中，“之后无事可做”。这是一个“事后要做的事情”的例子。

-(void)viewDidLoad
    {
    [super viewDidLoad];
    [PFAnalytics trackEvent:@"harvestFBPage"];
    
    [self.slideOff showMessage:@"Next step..."];
    [self.slideOff enterRight:0.0 then:^
        {
        NSLog(@"do this afterwards!");
        self.slideOff.alpha = 0.5;
        etc;
        etc;
        }];
    }

希望对分类有所帮助。如果您不太熟悉块作为参数，请不要忘记去这里https://stackoverflow.com/a/20760583/294884 。

回到手头的问题。

在自定义 segue中不可能使用任何类型的动画，除非它包含“完成时运行此块”的概念，因为您必须仅在完成时向 presentViewController: (with animated:NO) 发送消息。

假设我理解了你的问题，那就是关键。

于 2014-08-24T14:56:17.443 回答
2

AUIStoryBoardSegue是一个对象，它包装了一个过渡动画并神奇地出现在 Storyboards 中。可以在自定义 segue中使用自定义 viewcontroller 过渡动画。

假设您已经有一个实现UIViewControllerAnimatedTransitioning协议的自定义动画对象（如上），您需要：

  1. 创建一个自定义 segue 来包装动画师并通过子类化使其在您的故事板中可用UIStoryBoardSegue

    @interface MYCustomAnimationSegue : UIStoryboardSegue<UIViewControllerTransitioningDelegate>
@end

  2. 实现该perform:方法，将其设置为 transitioningdelegate（用于模态转换）或 navigationController 的委托（用于推送或替换转换）

    @implementation MYCustomAnimationSegue

- (void)perform {
    UIViewController *sourceVC = (UIViewController *)self.sourceViewController;
    UIViewController *destVC = (UIViewController *)self.destinationViewController;

    //Set the transitioningdelegate (for a modal transition)
    destVC.transitioningDelegate = self;

    //strong property, necessary to retain the Segue after perform: is finished
    //only needed if you want the customSegue to be the transitioningDelegate
    sourceVC.customSegue = self;

    //Set the modalPresentationStyle
    if (&UITransitionContextFromViewKey) {
        //iOS8
        destVC.modalPresentationStyle = UIModalPresentationFullScreen;
    } else {
        //iOS7
        destVC.modalPresentationStyle = UIModalPresentationCustom;
    }

    //Call the presentation
    [sourceVC presentViewController:destVC animated:YES completion:^{
        //release ourselves again
        sourceVC.customSegue = nil;
    }];
}

@end

  3. 实现UIViewControllerTransitioningDelegate返回自定义动画对象的方法

    - (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {

    return [[MyCustomAnimator alloc] init];
}

  4. 当您从一个视图控制器按住 ctrl 拖动到另一个时，您的自定义 segue 类现在将显示在 Interface Builder 中。 在此处输入图像描述

在你兴奋之前，有一个警告：这只适用于一个方向。为了使其适用于 Unwind Segue，您的 viewcontroller 类需要实现必要的方法。

于 2014-12-11T13:19:17.793 回答