objective-c - 转换从 View :toView:duration:options:completion: is not animating the transition

Question

我有一个 View Controller ，它在其 View 的给定区域中显示 2 个 subview Controller 的 View 。 2 个 subview Controller 是 FlopVC 和 FipVC。

我想制作从一个 subview 到另一个 subview 的过渡动画。我使用的代码是:

-(IBAction)flip:(id)sender{

    UIViewController *newVC = nil;

    if (self.isFlip) {
        newVC = [[FlopVC alloc] initWithNibName:nil bundle:nil];
    }else{
        newVC = [[FipVC alloc] initWithNibName:nil bundle:nil];
    }

    newVC.view.frame = CGRectMake(120, 20, 240, 260);
    [self.view addSubview:newVC.view];

    [UIView transitionFromView:self.currentVC.view
                        toView:newVC.view
                      duration:0.9
                       options:UIViewAnimationTransitionFlipFromLeft 
                    completion:^(BOOL finished) {
                        self.currentVC = newVC;
                        self.isFlip = ! self.isFlip;
                    }];



}

subview 被交换，但没有任何动画。我做错了什么？

PS 完整项目是 here .

Answer 1

UIViewAnimationTransitionFlipFromLeft != UIViewAnimationOptionTransitionFlipFromLeft