当我做makeKeyAndVisible时，两个UIViewController之间的动画

Question

我正在尝试动画来切换我拥有的两个UIViewController。但是当动画运行时，旧的UIViewController是白色的。

    // viewController is the new UIViewController 
[UIView animateWithDuration:0.6 
        delay:0 
    options:UIViewAnimationOptionCurveLinear 
        animations:^(void){
             [viewController.view setTransform:CGAffineTransformMakeTranslation(0, -460)];
        }
        completion:^(BOOL finished){
             if (finished){
                //
             }
        }
    ];

    [[[[UIApplication sharedApplication] delegate] window] setRootViewController:viewController];
    [[[[UIApplication sharedApplication] delegate] window] makeKeyAndVisible];

我有一个总是有UIViewController的对象：

@interface ManagerViews : NSObject {

    UIViewController *oneController;
    UIViewController *twoController;
    ...
}
@property(nonatomic, retain) UIViewController *oneController;
@property(nonatomic, retain) UIViewController *twoController;
...

我做错了什么？

Answer 1

您是否尝试将旧的UIViewController设置为“nil”或（我的Objective-C专业知识有点生疏）重置？