ios - 无需 UINavigationController 即可推送 Segue 动画

Question

我正在尝试使用自定义 segue 在 UIViewController 之间添加简单的推送动画。

(无需将我的 Controller 转换为使用 UINavigationController)

到目前为止找到的答案在使用导航 Controller 时可以正常工作，但在不使用导航 Controller 时会失败。 (我仍在阅读并尝试我在堆栈溢出上看到的其他答案)

我的自定义 segue.m 感谢 (ZHCustomSegue.m) Zakir，于 2012 年 7 月 5 日

#import "SFCustomSegue.h"
#import "QuartzCore/QuartzCore.h"

@implementation SFCustomSegue


-(void)perform {

UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
UIViewController *destinationController = (UIViewController*)[self destinationViewController];

CATransition* transition = [CATransition animation];
transition.duration = 4.0;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromRight;

[sourceViewController.view.layer addAnimation:transition forKey:kCATransition];

[sourceViewController presentViewController:[self destinationViewController] animated:NO completion:nil];

}

如果我按照 Zakir 的原始示例使用导航 Controller 并将最后两行替换为:

    [sourceViewController.navigationController.view.layer addAnimation:transition
                                                            forKey:kCATransition];

[sourceViewController.navigationController pushViewController:destinationController animated:NO];    

它有效......

Apple 的文档说(注意不是导航 Controller ，而是使用模态转场):

- (void)perform
{
// Add your own animation code here.

[[self sourceViewController] presentModalViewController:[self destinationViewController] animated:NO];
}

如果不工作，我就看不到动画。在 Zakir 的代码中，使用 4.0 秒，需要 4.0 秒，我就得到了我想要的动画。当然，如果我使用导航 Controller ，则默认为推送转换。在此代码中，我没有看到任何动画，并且需要 0 秒。

有人获得了自定义的segue动画来与UIViewControllers一起使用吗？

Answer 1

由于您正在调用 presentViewController，源 View Controller 将保留下来。如果您确实想用目标 View Controller 替换源 View Controller ，以便释放源 View Controller ，您可以这样做:

static UIImageView *screenShotOfView(UIView *view)
{
    // Create a snapshot for animation
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0.0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:context];
    UIImageView *screenShot = [[UIImageView alloc] initWithImage:UIGraphicsGetImageFromCurrentImageContext()];
    UIGraphicsEndImageContext();
    return screenShot;
}

- (void)perform
{
    UIViewController *source = (UIViewController *) self.sourceViewController;
    UIViewController *destination = (UIViewController *) self.destinationViewController;

    // Swap the snapshot out for the source view controller
    UIWindow *window = source.view.window;
    UIImageView *screenShot = screenShotOfView(source.view);
    CGRect originalFrame = destination.view.frame;

    BOOL animsEnabled = [UIView areAnimationsEnabled];
    [UIView setAnimationsEnabled:NO];
    {
        window.rootViewController = destination;
        [window addSubview:screenShot];
        [source.view removeFromSuperview];
        CGRect frame = destination.view.frame;
        frame.origin.x += source.view.bounds.size.width;
        destination.view.frame = frame;
    }
    [UIView setAnimationsEnabled:animsEnabled];

    [UIView animateWithDuration:kAnimationDuration
                     animations:^{
                         destination.view.frame = originalFrame;
                         CGRect frame = screenShot.frame;
                         frame.origin.x -= screenShot.bounds.size.width;
                         screenShot.frame = frame;

                     }
                     completion:^(BOOL finished) {
                         [screenShot removeFromSuperview];
                     }];
}