Question

我有一个在应用程序委托中创建的标签栏。通过从标签栏中加载的其中一个视图调用操作表单按钮，我打开帮助屏幕，但加载后有一个抽搐动作。

请原谅我非正式地说话。过去几个小时我一直在挑选我的大脑试图解决这个问题。

-(void)flipToHelp {
 HelpViewController *helpVariable = [[HelpViewController alloc] initWithNibName:@"HelpView" bundle:nil];
 [self setHelpViewController:helpVariable];
 [UIView beginAnimations:@"flipview" context:nil]; 
 [UIView setAnimationDuration:0.5];
 [UIView setAnimationCurve:UIViewAnimationCurveLinear];
 [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
 forView:_window cache:YES];

[_window removeFromSuperview];
[helpVariable release];
self.window.rootViewController = self.HelpViewController;
[UIView commitAnimations];
}

Answer 1

-(void)flipToHelp {
  HelpViewController *helpVariable = [[HelpViewController alloc] initWithNibName:@"HelpView" bundle:nil];
  [self setHelpViewController:helpVariable];
  [helpVariable release];

  [UIView beginAnimations:@"flipview" context:nil]; 
  [UIView setAnimationDuration:0.5];
  [UIView setAnimationCurve:UIViewAnimationCurveLinear];
  [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
                         forView:self.window
                           cache:YES];

  self.window.rootViewController = self.HelpViewController;
  [UIView commitAnimations];
}

这段代码怎么样？它还有动画片吗？

Answer 2

从评论主题重申一下，你不应该从超级视图中删除窗口（它在技术上没有超视图，所以它可能会导致问题）。 ~~设置窗口的rootViewController属性应该换掉视图层次结构，~~显然，急动来自于更改窗口的rootViewController属性，所以解决方案可能是避免使用该属性。以下是我认为应该足以实现这一目标：

-(void)flipToHelp {
     HelpViewController *helpVariable = [[HelpViewController alloc] initWithNibName:@"HelpView" bundle:nil];
     [UIView beginAnimations:@"flipview" context:nil]; 
     [UIView setAnimationDuration:0.5];
     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:_window cache:YES];
    [self.tabBarController removeFromSuperview];
    [_window addSubview:helpVariable];
    [UIView commitAnimations];
}

为什么在使用这个UIView动画块时会看到生涩的动画？

2 个答案: