如何在视图完全推入视图后使tabBar生成动画？

Question

我试图模仿TweetBot/NetBot动画tabBar后，从帐户tableView的操作推动。当视图被完全推入时，taBar才会从底部开始生成动画。我试过各种各样的隐藏/放映方法，并且在“演出”部分看起来都失败了。

有没有人有这样的建议？

Answer 1

首先，我认为你不使用UITabViewController，因为它不能被推入到UINavigationController栈中，所以我认为你使用的是嵌入UIViewController的独立UITabBar。这个假设是正确的吗？

尝试使用此代码（我没有尝试过）。

- (void)viewDidAppear { 
    [super viewDidAppear]; 

    // Calls showTabBar method after SOME_DELAY. You can also call directly [self showTabBar] if you want zero delay. 
    [self performSelector:@selector(showTabBar) afterDelay:SOME_DELAY]; 
} 

- (void)showTabBar { 
    // Before the animation begins, your UITabBar must be outside the view controller's view frame. 
    CGRect tabBarFrame = CGRectMake(0, 
            CGRectGetHeight(self.view.bounds), 
            CGRectGetWidth(self.view.bounds), 
            CGRectGetHeight(self.tabBar.frame); 
    self.tabBar.frame = tabBarFrame; 

    // Let's start with the animation, setting a new frame for tab bar inside an animation block 
    [UIView animateWithDuration:ANIMATION_DURATION animations:^{ 
     // Change origin Y. It assumes that the height of self.tabBar is right, otherwise put the height you want instead of CGRectGetHeight(self.tabBar.frame). 
     tabBarFrame.origin.y = CGRectGetHeight(self.view.bounds) - CGRectGetHeight(self.tabBar.frame); 

     self.tabBar.frame = tabBarFrame; 
    }]; 
}