在uinavigationcontroller中变黑了吗? [英] Fade to black within a uinavigationcontroller?

问题描述

当用户在显示新视图之前按下uinavigationcontroller上的按钮时，我想将整个屏幕(包括导航栏)淡化为黑色. (出于各种原因，我不想推这个新观点). 我将如何实现呢?

I want to fade the whole screen (including navigation bar) to black when a user presses a button on a uinavigationcontroler, before showing a new view. (i don't want to push this new view, for various reasons). How would I achieve this?

编辑

感谢Mac和Eiko，我已经弄清楚了.这是我使用的代码.不确定它是否是最佳选择，但可以解决问题.

Thanks to Mac and Eiko, I have figured it out. Here's the code I used. Not sure if it is optimal, but it does the trick.

// this is called from a programmatically constructed button. 
// change (void) to (IBAction) if linking from IB.

- (void)fadeAndShow:(id)sender
{
    // blackView is a @property which has been @synthesize-d
    // do I really need to alloc and init this?
    blackView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    blackView.alpha = 0.0;
    [blackView setBackgroundColor:[UIColor blackColor]];
    [self.navigationController.navigationBar.superview addSubview:blackView];
    [UIView beginAnimations:@"fadeAway" context:NULL]; 
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:0.75];
    [UIView setAnimationDidStopSelector:@selector(showNewScreen:finished:context:)];
    blackView.alpha = 1.0;
    [UIView commitAnimations];
}


-(void)showNewScreen:(NSString *)animationID finished:(BOOL)finished context:(void *)context
{
    // I guess you could fade in somewhere in the new view controller. 
    // don't know how to fade back in this view tho... viewDidAppear?
    NewViewController *controller = [[NewViewController alloc] initWithNibName:@"NewView" bundle:nil];
    [self.navigationController setNavigationBarHidden:YES];
    controller.hidesBottomBarWhenPushed = YES;
    [[self navigationController] pushViewController:controller animated:NO];
    [blackView removeFromSuperview];
    [controller release];
}

推荐答案

离我远去(我实际上还没有测试以下内容):

Off the top of my head (I haven't actually tested the following at all):

-(IBAction) buttonClicked:(id) sender  
{  
    [UIView beginAnimations:@"myAnimation" context:nil];  
    [UIView setAnimationDuration:ANIMATION_DURATION];

    blackView.alpha = 1.0;

    [UIView commitAnimations];
}

1. 在导航栏的超级视图中创建一个UIView(我假设它是窗口大小的)，该大小与窗口的大小相同.
2. 将该视图的backgroundColor设置为[UIColor blackColor]，并将其alpha设置为0.0.
3. 在按钮处理程序中执行上述操作(假设新的UIView是blackView，而ANIMATION_DURATION是所需的动画时间，以秒为单位).
4. 然后，在顶部添加新视图.

1. Create a UIView in the navigationbar's superview (which I'm assuming is window-sized) that is the same size as the window.
2. Set that view's backgroundColor to [UIColor blackColor], and its alpha to 0.0.
3. In your button handler do something like the above (assuming your new UIView is blackView and ANIMATION_DURATION is your desired animation time in seconds).
4. Then, add your new view on top.

对我来说太快了Eiko！此外，由于排序列表似乎与代码格式有关，因此代码位于顶部，很抱歉，答案看起来有些奇怪.

too quick for me Eiko! Also, code at the top since the ordered list seems to screw around with the code formatting - sorry the answer reads a little odd.

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