blocks|key|4802009|text|我最容易做到这一点的方法是设置一个"OverlayViewController“，它位于我的窗口或根视图的所有其他子视图之上。在您的应用程序委托或根视图控制器中设置它，并将OverlayViewController设置为单例，以便可以从代码或视图控制器层次结构中的任何位置访问它。然后，您可以在需要时调用方法来显示模式视图、显示活动指示器等，并且它们可能会覆盖任何选项卡栏或导航控制器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4802010|根视图控制器的示例代码：|4802011|-+(void)viewDidLoad+{
++OverlayViewController+*o+=+[OverlayViewController+sharedOverlayViewController];
++[self.view+addSubview:o.view];
}|code-block|syntax|javascript|4802012|可以用来显示模式视图的示例代码：|4802013|[[OverlayViewController+sharedOverlayViewController]+presentModalViewController:myModalViewController+animated:YES];|4802014|我还没有在我的OverlayViewController中实际使用过-presentModalViewController:animated:，但我希望这可以很好地工作。|offset|length|style|CODE|4802015|另请参阅：What+does+your+Objective-C+singleton+look+like?|4802016|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/145154/what-does-your-objective-c-singleton-look-like^0|0|0|0|0|0|Y|11|0|5|1B|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|17|8|@$O|18|P|19|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@]|9|@$O|1B|P|1C|1|1D]]|A|$]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

I accomplish this most easily by setting up an "OverlayViewController" that sits above all other subviews of my window or root view. Set this up in your app delegate or root view controller, and make OverlayViewController a singleton so that it can be accessed from anywhere in your code or view controller hierarchy. You can then call methods to show modal views, show activity indicators, etc, whenever you need to, and they can potentially cover any tab bars or navigation controllers.

Sample code for root view controller:

<pre><code>- (void)viewDidLoad {
 OverlayViewController *o = [OverlayViewController sharedOverlayViewController];
 [self.view addSubview:o.view];
}
</code></pre>

Sample code you might use to display your modal view:

<pre><code>[[OverlayViewController sharedOverlayViewController] presentModalViewController:myModalViewController animated:YES];
</code></pre>

I haven't actually used <code>-presentModalViewController:animated:</code> with my OverlayViewController but I expect this would work just fine.

See also: <a href="https://stackoverflow.com/questions/145154/what-does-your-objective-c-singleton-look-like">What does your Objective-C singleton look like?</a>

blocks|key|739117|text|模式视图将覆盖它被推送到其顶部的视图以及导航控制器的导航栏。但是，如果您使用-presentModalViewController:animated:方法，那么一旦动画完成，刚刚覆盖的视图实际上将消失，这使得您的模式视图的任何透明度都没有意义。(您可以通过在根视图控制器中实现-viewWillDisappear:和-viewDidDisappear:方法来验证这一点)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|739118|您可以将模式视图直接添加到视图层次结构中，如下所示：|739119|UIView+*modalView+=
++++[[[UIView+alloc]+initWithFrame:[[UIScreen+mainScreen]+bounds]]+autorelease];
modalView.opaque+=+NO;
modalView.backgroundColor+=
++++[[UIColor+blackColor]+colorWithAlphaComponent:0.5f];

UILabel+*label+=+[[[UILabel+alloc]+init]+autorelease];
label.text+=+@"Modal+View";
label.textColor+=+[UIColor+whiteColor];
label.backgroundColor+=+[UIColor+clearColor];
label.opaque+=+NO;
[label+sizeToFit];
[label+setCenter:CGPointMake(modalView.frame.size.width+/+2,
++++++++++++++++++++++++++++++++modalView.frame.size.height+/+2)];
[modalView+addSubview:label];

[self.view+addSubview:modalView];|code-block|syntax|javascript|739120|像这样将modalView作为子视图添加到根视图中实际上不会覆盖导航栏，但会覆盖导航栏下面的整个视图。我尝试使用用于初始化modalView的帧的原点，但负值导致它不显示。除了状态栏之外，我发现覆盖整个屏幕的最好方法是将modalView添加为窗口本身的子视图：|739121|TransparentModalViewAppDelegate+*delegate+=+(TransparentModalViewAppDelegate+*)[UIApplication+sharedApplication].delegate;
[delegate.window+addSubview:modalView];|739122|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

A modal view will cover the view it is pushed on top of as well as the navigation bar for your navigation controller. However, if you use the -presentModalViewController:animated: approach, then once the animation finishes the view just covered will actually disappear, which makes any transparency of your modal view pointless. (You can verify this by implementing the -viewWillDisappear: and -viewDidDisappear: methods in your root view controller).

You can add the modal view directly to the view hierarchy like so:

<pre><code>UIView *modalView =
 [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
modalView.opaque = NO;
modalView.backgroundColor =
 [[UIColor blackColor] colorWithAlphaComponent:0.5f];

UILabel *label = [[[UILabel alloc] init] autorelease];
label.text = @"Modal View";
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor clearColor];
label.opaque = NO;
[label sizeToFit];
[label setCenter:CGPointMake(modalView.frame.size.width / 2,
 modalView.frame.size.height / 2)];
[modalView addSubview:label];

[self.view addSubview:modalView];
</code></pre>

Adding the modalView as a subview to the root view like this will not actually cover the navigation bar, but it will cover the entire view below it. I tried playing around with the origin of the frame used to init the modalView, but negative values cause it to not display. The best method that I found to cover the entire screen besides the status bar is to add the modalView as a subview of the window itself:

<pre><code>TransparentModalViewAppDelegate *delegate = (TransparentModalViewAppDelegate *)[UIApplication sharedApplication].delegate;
[delegate.window addSubview:modalView];
</code></pre>

blocks|key|1236217|text|这篇关于displaying+a+semi-transparent+"Loading..."+view的文章可能会给出一些如何继续下去的建议。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1236218|entityMap|0|LINK|mutability|MUTABLE|url|http://cocoawithlove.com/2009/04/showing-message-over-iphone-keyboard.html^0|4|1B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

This post about <a href="http://cocoawithlove.com/2009/04/showing-message-over-iphone-keyboard.html" rel="nofollow noreferrer">displaying a semi-transparent "Loading..." view</a> might give a few pointers on how to proceed.

blocks|key|739173|text|您可以通过在视图和导航栏上叠加一个透明/半透明按钮来实现透明/半透明的模式视图效果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|739174|您可以通过UINavigationController的navigationBar属性访问导航栏。|739175|我发现与UILabel不同的是，UIButton会捕获鼠标事件，因此会给出正确的模式行为。|739176|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You can achieve transparent/semi-transparent modal view effect by overlaying a transparent/semi-transparent button on both the view and the navigation bar.

You can access the navigation bar through the navigationBar property of the UINavigationController. 

I found that UIButton unlike UILabel will trap mouse events - hence giving the correct modal behavior.

blocks|key|739191|text|我最终实现了这一点，对于导航或选项卡栏界面，我组合了一个覆盖视图控制器(参见:像素的答案)，它在隐藏或显示基于这个非常好的blog+post的视图控制器之前是隐藏/取消隐藏的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|739192|关于视图控制器，技巧是使其背景视图成为clearColor，然后半透明的覆盖视图是可见的，并且在视图控制器中作为子视图添加的任何视图都在前面，最重要的是不透明。|style|CODE|739193|entityMap|0|LINK|mutability|MUTABLE|url|http://ramin.firoozye.com/2009/09/29/semi-modal-transparent-dialogs-on-the-iphone/^0|1P|9|0|0|J|A|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

I finally accomplished this, for a navigation or tab bar interface, by combining an overlay view controller (see: pix0r's answer) that's hidden / un-hidden before hiding or showing a view controller based on this very good <a href="http://ramin.firoozye.com/2009/09/29/semi-modal-transparent-dialogs-on-the-iphone/" rel="nofollow noreferrer">blog post</a>.

Concerning the view controller, the tip is to make its background view the <code>clearColor</code>, then the semi-transparent overlay view is visible and whatever views are added as subviews in the view controller are in front and most importantly opaque.

blocks|key|1236254|text|是的，你必须手动添加视图，如果你想从底部滑入，或者其他什么，你也必须自己做动画。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1236255|为此，我编写了一个类，并以该类为例编写了一个半模态的datepicker。|1236256|您可以在代码为on+github的this+blog+post中找到文档|offset|length|1236257|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/reednj/TDSemiModal|1|http://reednj.tumblr.com/post/1346445326^0|0|0|7|9|0|H|E|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$F|U|G|V|1|W]|$F|X|G|Y|1|Z]]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]]]

Yeah, you have to add the view manually, and if you want to slide in from the bottom or whatever you have to do the animation yourself too.

I wrote a class to do this, and a semi-modal datepicker using that class as an example. 

You can find documentation in <a href="http://reednj.tumblr.com/post/1346445326" rel="nofollow">this blog post</a>, the code is <a href="http://github.com/reednj/TDSemiModal" rel="nofollow">on github</a>

blocks|key|4802406|text|我遇到了同样的问题，为了解决这个问题，我使用UIView的animateWithDuration:delay:options:animations:completion:添加了addSubview:的模式视图，并对视图层次结构中的变化进行了动画处理|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4802407|我在包含其他功能的UIViewController+(FRRViewController)的子类中添加了一个属性和两个方法。我将很快在gitHub上发布所有内容，但在此之前，您可以在下面看到相关代码。更多信息，你可以查看我的博客：How+to+display+a+transparent+modal+view+controller。|offset|length|4802408|#pragma+mark+-+Transparent+Modal+View
-(void)+presentTransparentModalViewController:+(UIViewController+*)+aViewController+
+++++++++++++++++++++++++++++++++++++animated:+(BOOL)+isAnimated+
++++++++++++++++++++++++++++++++++++withAlpha:+(CGFloat)+anAlpha{

++++self.transparentModalViewController+=+aViewController;
++++UIView+*view+=+aViewController.view;

++++view.opaque+=+NO;
++++view.alpha+=+anAlpha;
++++[view.subviews+enumerateObjectsUsingBlock:%5E(id+obj,+NSUInteger+idx,+BOOL+*stop)+{
++++++++UIView+*each+=+obj;
++++++++each.opaque+=+NO;
++++++++each.alpha+=+anAlpha;
++++}];

++++if+(isAnimated)+{
++++++++//Animated
++++++++CGRect+mainrect+=+[[UIScreen+mainScreen]+bounds];
++++++++CGRect+newRect+=+CGRectMake(0,+mainrect.size.height,+mainrect.size.width,+mainrect.size.height);


++++++++[self.view+addSubview:view];
++++++++view.frame+=+newRect;

++++++++[UIView+animateWithDuration:0.8
+++++++++++++++++++++++++animations:%5E{
+++++++++++++++++++++++++++++view.frame+=+mainrect;
+++++++++++++++++++++++++}+completion:%5E(BOOL+finished)+{
+++++++++++++++++++++++++++++//nop
+++++++++++++++++++++++++}];

++++}else{
++++++++view.frame+=+[[UIScreen+mainScreen]+bounds];
++++++++[self.view+addSubview:view];
++++}






}

-(void)+dismissTransparentModalViewControllerAnimated:(BOOL)+animated{

++++if+(animated)+{
++++++++CGRect+mainrect+=+[[UIScreen+mainScreen]+bounds];
++++++++CGRect+newRect+=+CGRectMake(0,+mainrect.size.height,+mainrect.size.width,+mainrect.size.height);
++++++++[UIView+animateWithDuration:0.8
+++++++++++++++++++++++++animations:%5E{
+++++++++++++++++++++++++++++self.transparentModalViewController.view.frame+=+newRect;
+++++++++++++++++++++++++}+completion:%5E(BOOL+finished)+{
+++++++++++++++++++++++++++++[self.transparentModalViewController.view+removeFromSuperview];
+++++++++++++++++++++++++++++self.transparentModalViewController+=+nil;
+++++++++++++++++++++++++}];
++++}


}|code-block|syntax|javascript|4802409|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cocoaosx.com/2011/10/20/how-to-display-transparent-modal-viewcontrollers/^0|0|37|1E|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I had this same problem and in order to The solution is to add the modal view with addSubview: and animate the change in the view hierarchy with UIView’s animateWithDuration:delay:options:animations:completion:

I added a property and 2 methods to a subclass of UIViewController (FRRViewController) that includes other functionalities. I will be publishing the whole stuff on gitHub soon, but until then you can see the relevant code below. For more info, you can check my blog: <a href="http://www.cocoaosx.com/2011/10/20/how-to-display-transparent-modal-viewcontrollers/">How to display a transparent modal view controller</a>.

<pre><code>#pragma mark - Transparent Modal View
-(void) presentTransparentModalViewController: (UIViewController *) aViewController 
 animated: (BOOL) isAnimated 
 withAlpha: (CGFloat) anAlpha{

 self.transparentModalViewController = aViewController;
 UIView *view = aViewController.view;

 view.opaque = NO;
 view.alpha = anAlpha;
 [view.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
 UIView *each = obj;
 each.opaque = NO;
 each.alpha = anAlpha;
 }];

 if (isAnimated) {
 //Animated
 CGRect mainrect = [[UIScreen mainScreen] bounds];
 CGRect newRect = CGRectMake(0, mainrect.size.height, mainrect.size.width, mainrect.size.height);


 [self.view addSubview:view];
 view.frame = newRect;

 [UIView animateWithDuration:0.8
 animations:^{
 view.frame = mainrect;
 } completion:^(BOOL finished) {
 //nop
 }];

 }else{
 view.frame = [[UIScreen mainScreen] bounds];
 [self.view addSubview:view];
 }






}

-(void) dismissTransparentModalViewControllerAnimated:(BOOL) animated{

 if (animated) {
 CGRect mainrect = [[UIScreen mainScreen] bounds];
 CGRect newRect = CGRectMake(0, mainrect.size.height, mainrect.size.width, mainrect.size.height);
 [UIView animateWithDuration:0.8
 animations:^{
 self.transparentModalViewController.view.frame = newRect;
 } completion:^(BOOL finished) {
 [self.transparentModalViewController.view removeFromSuperview];
 self.transparentModalViewController = nil;
 }];
 }


}
</code></pre>

blocks|key|1236283|text|在过去的一周里我一直在研究这个问题。我尝试了在谷歌和StackOverflow上找到的所有不同的答案和例子。它们都没有那么好用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1236284|作为iOS编程的新手，我不知道有一种叫做UIActionSheet的东西。因此，如果您试图实现这一点以显示按钮的模态覆盖(例如，一个模态询问某人他们想如何分享某些东西)，那么只需使用UIActionSheet。|offset|length|style|CODE|1236285|这是a+webpage+that+shows+an+example+of+how+to+do+this。|1236286|entityMap|0|LINK|mutability|MUTABLE|url|http://eureka.ykyuen.info/2010/04/14/iphone-uiactionsheet-example/|1^0|0|K|D|2J|D|K|D|0|0|2|1D|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|J|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|Q]]]]

I've been researching this same issue for the past week. I tried all the various answers and examples found in Google and here on StackOverflow. None of them worked that well.

Being new to iOS programming, I wasn't aware of something called <a href="http://eureka.ykyuen.info/2010/04/14/iphone-uiactionsheet-example/" rel="nofollow"><code>UIActionSheet</code></a>. So if you're trying to accomplish this in order to show a modal overlay of buttons (such as a modal asking someone how they want to share something), just use <code>UIActionSheet</code>. 

Here is <a href="http://eureka.ykyuen.info/2010/04/14/iphone-uiactionsheet-example/" rel="nofollow">a webpage that shows an example of how to do this</a>.

blocks|key|739384|text|以下是我为解决这个问题所做的工作--在谷歌上搜索细节，但这种方法对我来说非常有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|739385|739386|拍摄底层视图的屏幕截图。https://devforums.apple.com/message/266836+-这将导致一个现成的方法，返回当前屏幕的UIView。将屏幕截图交给模式视图(我使用了property)|unordered-list-item|offset|length|739387|Present+|739388|made+view+|739389|在模式视图控制器的viewDidAppear中，将图像设置为索引为0的UIImageView。通过状态栏的高度调整图像的垂直位置。|739390|在模式视图控制器的viewWillDisappear中，再次删除图像|739391|739392|效果是：|739393|739394|视图的动画效果与任何模式视图的动画效果一样--模式视图的半透明部分在动画停止时立即滑过现有视图|739395|，背景设置为屏幕截图-这使它看起来好像旧视图仍然在下面，尽管它不在下面。|739396|模式视图的消失动画一开始，图像就会被删除。与此同时，操作系统显示了旧的导航视图，因此模式视图会透明地滑出视线，就像你所预期的那样。|739397|739398|我试着在我自己的覆盖视图中做动画，但是效果不是很好。我有一个崩溃，没有迹象表明是什么崩溃了。而不是追逐这一点，我做了bg视图&工作真的很好。|739399|模式视图中的代码-我认为你可以弄清楚剩下的事情，也就是设置属性modalView.bgImage...|739400|-+(void)viewDidAppear:(BOOL)animated+{
++++//+background
++++//+Get+status+bar+frame+dimensions
++++CGRect+statusBarRect+=+[[UIApplication+sharedApplication]+statusBarFrame];
++++UIImageView+*imageView+=+[[UIImageView+alloc]+initWithImage:self.bgImage];
++++imageView.tag+=+5;
++++imageView.center+=+CGPointMake(imageView.center.x,+imageView.center.y+-+statusBarRect.size.height);
++++[self.view+insertSubview:imageView+atIndex:0];
}

-+(void)viewWillDisappear:(BOOL)animated+{
++++[[self.view+viewWithTag:5]+removeFromSuperview];
}|code-block|syntax|javascript|739401|entityMap|0|LINK|mutability|MUTABLE|url|https://devforums.apple.com/message/266836^0|0|0|C|16|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1J|8|@]|9|@$F|1K|G|1L|1|1M]]|A|$]]|$1|H|3|I|5|E|7|1N|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|1O|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|1P|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|1Q|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1S|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]|$1|T|3|U|5|E|7|1U|8|@]|9|@]|A|$]]|$1|V|3|W|5|E|7|1V|8|@]|9|@]|A|$]]|$1|X|3|Y|5|E|7|1W|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|14|3|15|5|16|7|20|8|@]|9|@]|A|$17|18]]|$1|19|3|-4|5|6|7|21|8|@]|9|@]|A|$]]]|1A|$1B|$5|1C|1D|1E|A|$1F|1G]]]]

Here's what I did to solve the problem - Google the details but this approach worked very well for me:

<ul>
<li>Take a screenshot of the underlying view. <a href="https://devforums.apple.com/message/266836" rel="noreferrer">https://devforums.apple.com/message/266836</a> - this leads to a ready-made method that returns a UIView for the current screen.</li>
<li>Hand the screenshot to the modal view (I used a property)</li>
<li>Present the modal view</li>
<li>In the modal view controller's viewDidAppear, set the image as UIImageView at index 0. Adjust the vertical position of the image by the height of the status bar.</li>
<li>In the modal view controller's viewWillDisappear, remove the image again</li>
</ul>

The effect is:

<ul>
<li>The view animates in as any modal view does - the semi transparent parts of the modal view glide over the existing view</li>
<li>As soon as the animation stops, the background is set to the screenshot - this makes it appear as if the old view is still underneath even though it isn't.</li>
<li>As soon as the modal view's disappear animation starts, the image is removed. The OS meanwhile shows the old navigation view so the modal view transparently glides away and out of sight as you'd expect.</li>
</ul>

I tried animating in my own overlay view but it didn't work very well. I got a crash with no indication as to what has crashed. Rather than chase this down I did the bg view &amp; Works really well.

Code in the modal view - I think you can figure out the rest, namely setting the property modalView.bgImage...

<pre><code>- (void)viewDidAppear:(BOOL)animated {
 // background
 // Get status bar frame dimensions
 CGRect statusBarRect = [[UIApplication sharedApplication] statusBarFrame];
 UIImageView *imageView = [[UIImageView alloc] initWithImage:self.bgImage];
 imageView.tag = 5;
 imageView.center = CGPointMake(imageView.center.x, imageView.center.y - statusBarRect.size.height);
 [self.view insertSubview:imageView atIndex:0];
}

- (void)viewWillDisappear:(BOOL)animated {
 [[self.view viewWithTag:5] removeFromSuperview];
}
</code></pre>

blocks|key|3959206|text|我是从https://gist.github.com/1279713得到这个想法的|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3959207|准备：在模式视图xib+(或使用故事板的场景)中，我将全屏背景UIImageView+(将其与.h文件挂钩并赋予其属性"backgroundImageView")设置为0.3+alpha。我将视图(UIView)的背景颜色设置为纯黑色。|style|BOLD|3959208|的想法：，然后在模式视图控制器的"viewDidLoad“中，我捕获来自原始状态的屏幕截图，并将该图像设置为背景UIImageView。将初始Y点设定为-480，并使用带有EaseInOut动画选项的0.4秒持续时间使其滑至Y点0。当我们关闭视图控制器时，做相反的事情。|3959209|模态视图控制器类的代码|3959210|.h文件：|3959211|@property+(weak,+nonatomic)+IBOutlet+UIImageView+*backgroundImageView;
-+(void)+backgroundInitialize;
-+(void)+backgroundAnimateIn;
-+(void)+backgroundAnimateOut;|code-block|syntax|javascript|3959212|.m文件：|3959213|-+(void)+backgroundInitialize{
++++UIGraphicsBeginImageContextWithOptions(((UIViewController+*)delegate).view.window.frame.size,+YES,+0.0);
++++[((UIViewController+*)delegate).view.window.layer+renderInContext:UIGraphicsGetCurrentContext()];
++++UIImage+*+screenshot+=+UIGraphicsGetImageFromCurrentImageContext();
++++UIGraphicsEndImageContext();
++++backgroundImageView.image=screenshot;
}
-+(void)+backgroundAnimateIn{
++++CGRect+backgroundImageViewRect+=+backgroundImageView.frame;
++++CGRect+backgroundImageViewRectTemp+=+backgroundImageViewRect;
++++backgroundImageViewRectTemp.origin.y=-480;
++++backgroundImageView.frame=backgroundImageViewRectTemp;

++++[UIView+animateWithDuration:0.4+delay:0.0+options:UIViewAnimationCurveEaseInOut+animations:%5E{
++++++++backgroundImageView.frame=backgroundImageViewRect;
++++}+completion:%5E(BOOL+finished)+{

++++}];
}
-+(void)+backgroundAnimateOut{
++++CGRect+backgroundImageViewRect+=+backgroundImageView.frame;
++++backgroundImageViewRect.origin.y-=480;

++++[UIView+animateWithDuration:0.4+delay:0.0+options:UIViewAnimationCurveEaseInOut+animations:%5E{
++++++++backgroundImageView.frame=backgroundImageViewRect;
++++}+completion:%5E(BOOL+finished)+{

++++}];
}|3959214|在viewDidLoad中，只需调用：|3959215|[self+backgroundInitialize];
[self+backgroundAnimateIn];|3959216|在我们忽略模式视图控制器的任何地方，我们都调用：|3959217|[self+backgroundAnimateOut];|3959218|请注意，这将始终动画背景图像。因此，如果此模式视图控制器转换样式(或segue转换样式)未设置为"Cover+Vertical"，则可能不需要调用动画方法。|3959219|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/1279713^0|3|V|0|0|0|3|0|0|4|0|9|2|0|0|5|0|0|0|5|0|0|0|J|0|0|0|O|0|0|0|26|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|E|5|6|7|1I|8|@$A|1J|B|1K|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1L|8|@$A|1M|B|1N|F|G]]|9|@]|C|$]]|$1|J|3|K|5|6|7|1O|8|@$A|1P|B|1Q|F|G]]|9|@]|C|$]]|$1|L|3|M|5|6|7|1R|8|@$A|1S|B|1T|F|G]]|9|@]|C|$]]|$1|N|3|O|5|P|7|1U|8|@]|9|@]|C|$Q|R]]|$1|S|3|T|5|6|7|1V|8|@$A|1W|B|1X|F|G]]|9|@]|C|$]]|$1|U|3|V|5|P|7|1Y|8|@]|9|@]|C|$Q|R]]|$1|W|3|X|5|6|7|1Z|8|@$A|20|B|21|F|G]]|9|@]|C|$]]|$1|Y|3|Z|5|P|7|22|8|@]|9|@]|C|$Q|R]]|$1|10|3|11|5|6|7|23|8|@$A|24|B|25|F|G]]|9|@]|C|$]]|$1|12|3|13|5|P|7|26|8|@]|9|@]|C|$Q|R]]|$1|14|3|15|5|6|7|27|8|@$A|28|B|29|F|G]]|9|@]|C|$]]|$1|16|3|-4|5|6|7|2A|8|@]|9|@]|C|$]]]|17|$18|$5|19|1A|1B|C|$1C|1D]]]]

I got this idea from <a href="https://gist.github.com/1279713" rel="nofollow">https://gist.github.com/1279713</a>

Prepare:
In the modal view xib (or scene using storyboard), I setup the full-screen background UIImageView (hook it with the .h file and give it a property "backgroundImageView") with 0.3 alpha. And I set the view (UIView) background color as plain black.

Idea:
Then in "viewDidLoad" of the modal view controller I capture the screenshot from the original status and set that image to the background UIImageView. Set the initial Y point to -480 and let it slide to Y point 0 using 0.4-second duration with EaseInOut animation option. When we dismiss the view controller, just do the reverse thing.

Code for the Modal View Controller Class

.h file:

<pre><code>@property (weak, nonatomic) IBOutlet UIImageView *backgroundImageView;
- (void) backgroundInitialize;
- (void) backgroundAnimateIn;
- (void) backgroundAnimateOut;
</code></pre>

.m file:

<pre><code>- (void) backgroundInitialize{
 UIGraphicsBeginImageContextWithOptions(((UIViewController *)delegate).view.window.frame.size, YES, 0.0);
 [((UIViewController *)delegate).view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
 UIImage * screenshot = UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();
 backgroundImageView.image=screenshot;
}
- (void) backgroundAnimateIn{
 CGRect backgroundImageViewRect = backgroundImageView.frame;
 CGRect backgroundImageViewRectTemp = backgroundImageViewRect;
 backgroundImageViewRectTemp.origin.y=-480;
 backgroundImageView.frame=backgroundImageViewRectTemp;

 [UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
 backgroundImageView.frame=backgroundImageViewRect;
 } completion:^(BOOL finished) {

 }];
}
- (void) backgroundAnimateOut{
 CGRect backgroundImageViewRect = backgroundImageView.frame;
 backgroundImageViewRect.origin.y-=480;

 [UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
 backgroundImageView.frame=backgroundImageViewRect;
 } completion:^(BOOL finished) {

 }];
}
</code></pre>

In viewDidLoad, simply call:

<pre><code>[self backgroundInitialize];
[self backgroundAnimateIn];
</code></pre>

In anywhere we dismiss the modal view controller, we call:

<pre><code>[self backgroundAnimateOut];
</code></pre>

Please note that this will ALWAYS animate the background image. So if this modal view controller transition style (or the segue transition style) is not set to "Cover Vertical", you may not need to call the animation methods.

blocks|key|739499|text|self.modalPresentationStyle+=+UIModalPresentationCurrentContext;
[self+presentModalViewController:newview+animated:YES];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|739500|并确保将模式视图背景设置为透明，|unstyled|739501|self.view.background+=+....α:0.x；|739502|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>self.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentModalViewController:newview animated:YES];
</code></pre>

and make sure you setup the modal view background to be transparent, 

self.view.background = .... alpha:0.x;

blocks|key|1236390|text|最简单的方法是使用navigationController的modalPresentationStyle属性(但您必须自己制作动画)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1236391|self.navigationController.modalPresentationStyle+=+UIModalPresentationCurrentContext;
[self+presentModalViewController:modalViewController+animated:NO];
modalViewController.view.alpha+=+0;
[UIView+animateWithDuration:0.5+animations:%5E{
++++modalViewController.view.alpha+=+1;
}];|code-block|syntax|javascript|1236392|entityMap^0|9|K|U|M|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

The easiest way is to use modalPresentationStyle property of navigationController (but you'll have to make animation by yourself):

<pre><code>self.navigationController.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentModalViewController:modalViewController animated:NO];
modalViewController.view.alpha = 0;
[UIView animateWithDuration:0.5 animations:^{
 modalViewController.view.alpha = 1;
}];
</code></pre>

blocks|key|3959288|text|如果将模式视图控制器的modalPresentationStyle设置为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3959289|viewController.modalPresentationStyle+=+17；|3959290|背景中的视图不会被删除。(TWTweetComposeViewController+use+it)。|3959291|不过，我并没有试图用这段代码通过App+Store的审查|3959292|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

if you set modalPresentationStyle for the modal view controller to:

viewController.modalPresentationStyle = 17;

The view in the background is not removed. (TWTweetComposeViewController use it).

I did not try to pass App Store review with this code though

blocks|key|3959332|text|我刚刚找到了解决这个问题的办法。只需创建UIViewController的1X1并将其添加到您的父视图控制器。并在该UIViewController中显示透明模式视图控制器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3959333|在viewDidLoad上；|3959334|3959335|+self.dummyViewController+=+[UIViewController分配初始化]；self.dummyViewController.view+setFrame:CGRectMake(0，0，1，1)；self.view+addSubView:self.dummyViewController.view；|blockquote|3959336|3959337|3959338|当你需要打开一个transparentViewController时；|3959339|presentModalViewController:yourTransparentModalViewController+|3959340|+self.dummyViewController动画:true；|3959341|3959342|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|V|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|Z|8|@]|9|@]|A|$]]|$1|N|3|O|5|G|7|10|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|R|$]]

I just found a workaround for that. Just create a 1X1 of UIViewController and add it to your parent view controller. And show the transparent modal view controller in that UIViewController.

on viewDidLoad;

<blockquote>
 self.dummyViewController = [[UIViewController alloc] init];
 [self.dummyViewController.view setFrame:CGRectMake(0, 0, 1, 1)];
 [self.view addSubView:self.dummyViewController.view];
</blockquote>

when you need to open a transparentViewController;

<blockquote>
 [self.dummyViewController presentModalViewController:yourTransparentModalViewController animated:true];
</blockquote>

blocks|key|739599|text|我已经创建了开源库MZFormSheetController来在附加的UIWindow上显示模态表单。您可以使用它来呈现透明模式视图控制器，甚至可以调整所呈现的视图控制器的大小。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|739600|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/m1entus/MZFormSheetController^0|9|L|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I've created open soruce library <a href="https://github.com/m1entus/MZFormSheetController" rel="nofollow">MZFormSheetController</a> to present modal form sheet on additional UIWindow. You can use it to present transparency modal view controller, even adjust the size of the presented view controller.

blocks|key|3959398|text|如果您需要一个类似附加屏幕的屏幕，下面的代码可能会对您有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3959399|📷|atomic|offset|length|3959400|​|3959401|代码：|style|BOLD|3959402|MyViewController+*+myViewController+=+[[MyViewController+alloc]+initWithNibName:nibName+bundle:nil];
UINavigationController+*+myNavigationController+=+[[UINavigationController+alloc]+initWithRootViewController:+myViewController];
myNavigationController.modalPresentationStyle+=+UIModalPresentationPageSheet;
[self+presentModalViewController:+myNavigationController+animated:YES];|code-block|syntax|javascript|3959403|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3b37aca2315df9401a405ca4e590691f.png|imageAlt^0|0|0|1|0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@$E|12|F|13|1|14]]|A|$]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|16|8|@$E|17|F|18|K|L]]|9|@]|A|$]]|$1|M|3|N|5|O|7|19|8|@]|9|@]|A|$P|Q]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

If you need a screen like the attached one, the below code may help you.<img src="https://i.stack.imgur.com/06LkJ.png" alt="enter image description here">

The code:

<pre><code>MyViewController * myViewController = [[MyViewController alloc] initWithNibName:nibName bundle:nil];
UINavigationController * myNavigationController = [[UINavigationController alloc] initWithRootViewController: myViewController];
myNavigationController.modalPresentationStyle = UIModalPresentationPageSheet;
[self presentModalViewController: myNavigationController animated:YES];
</code></pre>

blocks|key|739698|text|如果你想要一个屏幕覆盖，使用parentViewController.view，它会放在导航栏%2B%2B上面|type|unstyled|depth|inlineStyleRanges|entityRanges|data|739699|MyCustomViewController*+myOverlayView+=++[[MyCustomViewController+alloc]+init];+[self.parentViewController.view+addSubview:myOverlayView];|offset|length|style|CODE|739700|entityMap^0|0|0|3U|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

If say you want a screen overlay, use the parentViewController.view, it will place above navigation bar ++

<code>MyCustomViewController* myOverlayView = [[MyCustomViewController alloc] init];
[self.parentViewController.view addSubview:myOverlayView];</code>

blocks|key|3959444|text|这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3959445|UIViewController+*modalViewController+=+[[UIViewController+alloc]+init];
modalViewController.view.backgroundColor+=+[UIColor+whiteColor]+colorWithAlpha:0.5];
[self+showDetailViewController:modalViewController+sender:nil];|code-block|syntax|javascript|3959446|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This worked for me: 

<pre><code>UIViewController *modalViewController = [[UIViewController alloc] init];
modalViewController.view.backgroundColor = [UIColor whiteColor] colorWithAlpha:0.5];
[self showDetailViewController:modalViewController sender:nil];
</code></pre>

blocks|key|4802875|text|对于iOS+8%2B，您可以将UIModalPresentationOverCurrentContext表示风格用于呈现的视图控制器，以轻松实现所需的行为。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|4802876|UIViewController+*viewController+=+[[UIViewController+alloc]+init];
viewController.view.backgroundColor+=+[[UIColor+blackColor]+colorWithAlphaComponent:0.9f];
viewController.modalPresentationStyle+=+UIModalPresentationOverCurrentContext;
[self+presentViewController:viewController+animated:YES+completion:nil];|code-block|syntax|javascript|4802877|如果您还需要支持iOS+7-请检查this+thread。|4802878|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/26032472/presenting-semi-transparent-viewcontroller-that-works-both-in-ios7-and-ios8^0|D|11|1K|3|0|0|H|B|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|10|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|11|8|@]|E|@$9|12|A|13|1|14]]|F|$]]|$1|N|3|-4|5|6|7|15|8|@]|E|@]|F|$]]]|O|$P|$5|Q|R|S|F|$T|U]]]]

For iOS 8+ you can use <code>UIModalPresentationOverCurrentContext</code> presentation style for presented view controller to easy achieve desired behavior.

<pre><code>UIViewController *viewController = [[UIViewController alloc] init];
viewController.view.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.9f];
viewController.modalPresentationStyle = UIModalPresentationOverCurrentContext;
[self presentViewController:viewController animated:YES completion:nil];
</code></pre>

If you also need to support iOS 7 - check <a href="https://stackoverflow.com/questions/26032472/presenting-semi-transparent-viewcontroller-that-works-both-in-ios7-and-ios8">this thread</a>.

I'm trying to create a transparent modal View on top of my navigation controller. Does anyone know if this is possible?

Transparent Modal View on Navigation Controller

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正试图在我的导航控制器上创建一个透明的模式视图。有没有人知道这是否可能？

问导航控制器上的透明模式视图
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问导航控制器上的透明模式视图EN