objective-c – 在iOS7上使用UINavigationControllerDelegate实

there are others that suggest just modifying the view position,but that seems like a tacky hack

不,这不是一个俗气的黑客.那就是你做的.自定义过渡动画只是意味着您负责将新视图带入场景 – 前提是它最终位于正确的位置.因此,从底部对其进行动画处理的方法就是将其放置在底部并将其动画到位.

例如(几乎直接从我书中的示例代码中获取)：

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    // boilerplate
    UIViewController* vc1 = 
        [transitionContext 
            viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController* vc2 = 
        [transitionContext  
            viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView* con = [transitionContext containerView];
    CGRect r1start = [transitionContext initialFrameForViewController:vc1];
    CGRect r2end = [transitionContext finalFrameForViewController:vc2];
    UIView* v1 = vc1.view;
    UIView* v2 = vc2.view;
    // end boilerplate

    CGRect r = r2end;
    r.origin.y += r.size.height; // start at the bottom...
    v2.frame = r;
    [con addSubview:v2];

    [[UIApplication sharedApplication] beginIgnoringInteractionEvents];
    [UIView animateWithDuration:0.4 animations:^{
        v2.frame = r2end; // ... and move up into place
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
        [[UIApplication sharedApplication] endIgnoringInteractionEvents];
    }];
}

该代码是根据我在https://github.com/mattneub/Programming-iOS-Book-Examples/blob/master/bk2ch06p292customAnimation1/ch19p620customAnimation1/AppDelegate.m的例子改编的.这个例子几乎就是你所描述的,除了它是一个标签控制器而不是导航控制器,它来自侧面而不是底部.但原则完全一样.