blocks|key|463778|text|另一种方法是使用“容器视图”。只需将alpha设置为低于1并嵌入seque即可。XCode+5，目标iOS7。已在iPhone上测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463779|​|463780|📷|atomic|offset|length|463781|463782|iOS6提供的容器视图。关于这一点的博客文章的Link。|463783|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/9fec3b3d5331cae4713d092f9949d21d.png|imageAlt|1|LINK|MUTABLE|url|http://mikeglukhov.blogspot.ru/2013/08/make-view-controller-transparent.html^0|0|0|0|1|0|0|0|N|4|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]|U|$5|V|P|W|A|$X|Y]]]]

Alternate way is to use a "container view". Just make alpha below 1 and embed with seque. XCode 5, target iOS7. Tested on iPhone.

<img src="https://i.stack.imgur.com/nRDbW.png" alt="enter image description here">

Container view available from iOS6.
<a href="http://mikeglukhov.blogspot.ru/2013/08/make-view-controller-transparent.html" rel="nofollow noreferrer">Link</a> to blog post about that.

blocks|key|463823|text|这段代码在iOS6和iOS7下的iPhone上运行良好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463824|presentedVC.view.backgroundColor+=+YOUR_COLOR;+//+can+be+with+'alpha'
presentingVC.modalPresentationStyle+=+UIModalPresentationCurrentContext;
[presentingVC+presentViewController:presentedVC+animated:YES+completion:NULL];|code-block|syntax|javascript|463825|在这种情况下，您会错过幻灯片动画。要保留动画，您仍然可以使用以下“非优雅”扩展：|463826|[presentingVC+presentViewController:presentedVC+animated:YES+completion:%5E{
++++[presentedVC+dismissViewControllerAnimated:NO+completion:%5E{
++++++++presentingVC.modalPresentationStyle+=+UIModalPresentationCurrentContext;
++++++++[presentingVC+presentViewController:presentedVC+animated:NO+completion:NULL];
++++}];
}];|463827|如果我们的presentingV位于UINavigationController或UITabbarController内部，您需要以presentingVC的身份使用该控制器进行操作。|463828|此外，在iOS7中，您可以应用UIViewControllerTransitioningDelegate协议实现自定义过渡动画。当然，在这种情况下，你可以得到透明的背景|offset|length|style|CODE|463829|@interface+ModalViewController+:+UIViewController+<UIViewControllerTransitioningDelegate>|463830|首先，在演示之前，您必须设置modalPresentationStyle|463831|modalViewController.modalPresentationStyle+=+UIModalPresentationCustom;|463832|然后，您必须实现两个协议方法|463833|-+(id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController+*)presented+presentingController:(UIViewController+*)presenting+sourceController:(UIViewController+*)source
{
++++CustomAnimatedTransitioning+*transitioning+=+[CustomAnimatedTransitioning+new];
++++transitioning.presenting+=+YES;
++++return+transitioning;
}

-+(id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController+*)dismissed
{
++++CustomAnimatedTransitioning+*+transitioning+=+[CustomAnimatedTransitioning+new];
++++transitioning.presenting+=+NO;
++++return+transitioning;
}|463834|最后一件事是在CustomAnimatedTransitioning类中定义自定义转换|463835|@interface+CustomAnimatedTransitioning+:+NSObject+<UIViewControllerAnimatedTransitioning>
@property+(nonatomic)+BOOL+presenting;
@end

@implementation+CurrentContextTransitionAnimator

-+(NSTimeInterval)transitionDuration:(id+<UIViewControllerContextTransitioning>)transitionContext+
{
++++return+0.25;
}

-+(void)animateTransition:(id+<UIViewControllerContextTransitioning>)transitionContext+
{
++++UIViewController+*fromViewController+=+[transitionContext+viewControllerForKey:UITransitionContextFromViewControllerKey];
++++UIViewController+*toViewController+=+[transitionContext+viewControllerForKey:UITransitionContextToViewControllerKey];

++++if+(self.presenting)+{
++++++++//+custom+presenting+animation
++++}
++++else+{
++++++++//+custom+dismissing+animation
++++}
}|463836|entityMap^0|0|0|0|0|0|F|11|0|0|E|M|0|0|0|0|7|R|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1D|8|@$O|1E|P|1F|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|D|7|1G|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1H|8|@$O|1I|P|1J|Q|R]]|9|@]|A|$]]|$1|W|3|X|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|11|5|D|7|1M|8|@]|9|@]|A|$E|F]]|$1|12|3|13|5|6|7|1N|8|@$O|1O|P|1P|Q|R]]|9|@]|A|$]]|$1|14|3|15|5|D|7|1Q|8|@]|9|@]|A|$E|F]]|$1|16|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|17|$]]

This code works fine on iPhone under iOS6 and iOS7:

<pre><code>presentedVC.view.backgroundColor = YOUR_COLOR; // can be with 'alpha'
presentingVC.modalPresentationStyle = UIModalPresentationCurrentContext;
[presentingVC presentViewController:presentedVC animated:YES completion:NULL];
</code></pre>

In this case you miss slide-on animation. To retain animation you still can use the following "non-elegant" extension:

<pre><code>[presentingVC presentViewController:presentedVC animated:YES completion:^{
 [presentedVC dismissViewControllerAnimated:NO completion:^{
 presentingVC.modalPresentationStyle = UIModalPresentationCurrentContext;
 [presentingVC presentViewController:presentedVC animated:NO completion:NULL];
 }];
}];
</code></pre>

If our presentingV is located inside of UINavigationController or UITabbarController you need to operate with that controllers as presentingVC.

Further, in iOS7 you can implement custom transition animation applying <code>UIViewControllerTransitioningDelegate</code> protocol. Of course, in this case you can get transparent background

<pre><code>@interface ModalViewController : UIViewController &lt;UIViewControllerTransitioningDelegate&gt;
</code></pre>

First, before presenting you have to set <code>modalPresentationStyle</code>

<pre><code>modalViewController.modalPresentationStyle = UIModalPresentationCustom;
</code></pre>

Then you have to implement two protocol methods

<pre><code>- (id&lt;UIViewControllerAnimatedTransitioning&gt;)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
 CustomAnimatedTransitioning *transitioning = [CustomAnimatedTransitioning new];
 transitioning.presenting = YES;
 return transitioning;
}

- (id&lt;UIViewControllerAnimatedTransitioning&gt;)animationControllerForDismissedController:(UIViewController *)dismissed
{
 CustomAnimatedTransitioning * transitioning = [CustomAnimatedTransitioning new];
 transitioning.presenting = NO;
 return transitioning;
}
</code></pre>

The last thing is to define your custom transition in <code>CustomAnimatedTransitioning</code> class

<pre><code>@interface CustomAnimatedTransitioning : NSObject &lt;UIViewControllerAnimatedTransitioning&gt;
@property (nonatomic) BOOL presenting;
@end

@implementation CurrentContextTransitionAnimator

- (NSTimeInterval)transitionDuration:(id &lt;UIViewControllerContextTransitioning&gt;)transitionContext 
{
 return 0.25;
}

- (void)animateTransition:(id &lt;UIViewControllerContextTransitioning&gt;)transitionContext 
{
 UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
 UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

 if (self.presenting) {
 // custom presenting animation
 }
 else {
 // custom dismissing animation
 }
}
</code></pre>

blocks|key|463869|text|这有点老生常谈，但对我来说，这段代码可以工作(iOS+6)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463870|AppDelegate+*appDelegate+=+(AppDelegate+*)[[UIApplication+sharedApplication]+delegate];

[self+presentViewController:self.signInViewController+animated:YES+completion:%5E{
++++[self.signInViewController+dismissViewControllerAnimated:NO+completion:%5E{
++++++++appDelegate.window.rootViewController.modalPresentationStyle+=+UIModalPresentationCurrentContext;
++++++++[self+presentViewController:self.signInViewController+animated:NO+completion:nil];
++++++++appDelegate.window.rootViewController.modalPresentationStyle+=+UIModalPresentationFullScreen;

++++}];
}];|code-block|syntax|javascript|463871|此代码也适用于iPhone|463872|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It's a bit of hacky way, but for me this code works (iOS 6): 

<pre><code>AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

[self presentViewController:self.signInViewController animated:YES completion:^{
 [self.signInViewController dismissViewControllerAnimated:NO completion:^{
 appDelegate.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;
 [self presentViewController:self.signInViewController animated:NO completion:nil];
 appDelegate.window.rootViewController.modalPresentationStyle = UIModalPresentationFullScreen;

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

This code works also on iPhone

blocks|key|463892|text|在appdelegate中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463893|-+(BOOL)application:(UIApplication+*)application+didFinishLaunchingWithOptions:(NSDictionary+*)launchOptions
{
++++[[_window+rootViewController]setModalPresentationStyle:UIModalPresentationCurrentContext];
++++return+YES;
}|code-block|syntax|javascript|463894|在你必须加载下一个视图的第一个视图控制器中：|463895|++NextViewController+*customvc+=+[[NextViewController+alloc]init];
++++[self+presentViewController:customvc+animated:YES+completion:%5E{

++++}];|463896|在要透明添加的nextViewController中：|463897|-+(void)viewDidLoad
{
++++[super+viewDidLoad];
++++self.view.backgroundColor+=+[UIColor+clearColor];
++++UIView*+backView+=+[[UIView+alloc]+initWithFrame:self.view.frame];
++++backView.backgroundColor+=+[[UIColor+blackColor]+colorWithAlphaComponent:0.6];
++++[self.view+insertSubview:backView+atIndex:0];
}|463898|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

in appdelegate :

<pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 [[_window rootViewController]setModalPresentationStyle:UIModalPresentationCurrentContext];
 return YES;
}
</code></pre>

in you first view controller from where you have to load next view:

<pre><code> NextViewController *customvc = [[NextViewController alloc]init];
 [self presentViewController:customvc animated:YES completion:^{

 }];
</code></pre>

in your nextViewController which is to be added transparent:

<pre><code>- (void)viewDidLoad
{
 [super viewDidLoad];
 self.view.backgroundColor = [UIColor clearColor];
 UIView* backView = [[UIView alloc] initWithFrame:self.view.frame];
 backView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];
 [self.view insertSubview:backView atIndex:0];
}
</code></pre>

blocks|key|463922|text|我已经创建了一个对象来处理我所谓的“叠加模式”的表示，这意味着它保留了背景的视图，并允许您拥有一个具有透明背景的模式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463923|它有一个简单的方法可以做到这一点：|463924|-+(void)presentViewController:(UIViewController+*)presentedViewController
+++++++fromViewController:(UIViewController+*)presentingViewController
{
++++presentedViewController.modalPresentationStyle+=+UIModalPresentationCustom;
++++presentedViewController.transitioningDelegate+=+self;
++++presentedViewController.modalPresentationCapturesStatusBarAppearance+=+YES;

++++[presentedViewController+setNeedsStatusBarAppearanceUpdate];

++++[presentingViewController+presentViewController:presentedViewController
+++++++++++++++++++++++++++++++++++++++animated:YES
+++++++++++++++++++++++++++++++++++++completion:nil];
}|code-block|syntax|javascript|463925|如果呈现的视图控制器具有不同的preferredStatusBarStyle，将modalPresentationCapturesStatusBarAppearance属性设置为YES并强制更新状态栏外观是很重要的。|offset|length|style|CODE|463926|此对象应具有@property+(assign,+nonatommic)+isPresenting|463927|您希望此对象符合UIViewControllerAnimatedTransitioning和UIViewControllerTransitioningDelegate协议，并实现以下方法：|463928|-+(id)animationControllerForPresentedController:(UIViewController+*)presented
+++++++++++++++++++++++++++presentingController:(UIViewController+*)presenting
+++++++++++++++++++++++++++++++sourceController:(UIViewController+*)source
{
++++self.isPresenting+=+YES;

++++return+self;
}

-+(id)animationControllerForDismissedController:(UIViewController+*)dismissed
{
++++self.isPresenting+=+NO;

++++return+self;
}|463929|和：|463930|-+(NSTimeInterval)transitionDuration:(id)transitionContext
{
++++return+0.25;
}

-+(void)animateTransition:(id)transitionContext
{
++++UIViewController*+firstVC+=+[transitionContext+viewControllerForKey:UITransitionContextFromViewControllerKey];
++++UIViewController*+secondVC+=+[transitionContext+viewControllerForKey:UITransitionContextToViewControllerKey];
++++UIView*+containerView+=+[transitionContext+containerView];
++++UIView*+firstView+=+firstVC.view;
++++UIView*+secondView+=+secondVC.view;

++++if+(self.isPresenting)+{
++++++++[containerView+addSubview:secondView];
++++++++secondView.frame+=+(CGRect){
++++++++++++containerView.frame.origin.x,
++++++++++++containerView.frame.origin.y+%2B+containerView.frame.size.height,
++++++++++++containerView.frame.size
++++++++};

++++++++firstView.tintAdjustmentMode+=+UIViewTintAdjustmentModeDimmed;
++++++++[UIView+animateWithDuration:0.25+animations:%5E{
++++++++++++secondView.frame+=+containerView.frame;
++++++++}+completion:%5E(BOOL+finished)+{
++++++++++++[transitionContext+completeTransition:YES];
++++++++}];
++++++++}+else+{
++++++++[UIView+animateWithDuration:0.25+animations:%5E{
++++++++++++firstView.frame+=+(CGRect){
++++++++++++++++containerView.frame.origin.x,
++++++++++++++++containerView.frame.origin.y+%2B+containerView.frame.size.height,
++++++++++++++++containerView.frame.size
++++++++};

++++++++}+completion:%5E(BOOL+finished)+{
++++++++++++[transitionContext+completeTransition:YES];
++++++++}];
++++}
}|463931|这是一个从底部滑动的动画，模仿默认的模式动画，但您可以随心所欲地制作。|463932|重要的是，呈现视图控制器的视图将保留在后面，让您创建一个透明的效果。|463933|此解决方案适用于iOS+7%2B|463934|entityMap^0|0|0|0|F|N|14|18|2H|3|0|6|17|0|8|11|1A|11|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|19|8|@$K|1A|L|1B|M|N]|$K|1C|L|1D|M|N]|$K|1E|L|1F|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1G|8|@$K|1H|L|1I|M|N]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1J|8|@$K|1K|L|1L|M|N]|$K|1M|L|1N|M|N]]|9|@]|A|$]]|$1|S|3|T|5|F|7|1O|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|1P|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1Q|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1R|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1S|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1T|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|15|$]]

I have created an object to handle the presentation of what I call a "superposed modal", meaning it retains the background's view and allows you to have a modal with a transparent background.

It has a single, simple method that does this:

<pre><code>- (void)presentViewController:(UIViewController *)presentedViewController
 fromViewController:(UIViewController *)presentingViewController
{
 presentedViewController.modalPresentationStyle = UIModalPresentationCustom;
 presentedViewController.transitioningDelegate = self;
 presentedViewController.modalPresentationCapturesStatusBarAppearance = YES;

 [presentedViewController setNeedsStatusBarAppearanceUpdate];

 [presentingViewController presentViewController:presentedViewController
 animated:YES
 completion:nil];
}
</code></pre>

It's important to set the <code>modalPresentationCapturesStatusBarAppearance</code> property to <code>YES</code> and force the status bar appearance to update, if your presented view controller has a different <code>preferredStatusBarStyle</code>.

This object should have a <code>@property (assign, nonatommic) isPresenting</code>

You want this object to comply to the <code>UIViewControllerAnimatedTransitioning</code> and <code>UIViewControllerTransitioningDelegate</code> protocols and implement the following methods:

<pre><code>- (id)animationControllerForPresentedController:(UIViewController *)presented
 presentingController:(UIViewController *)presenting
 sourceController:(UIViewController *)source
{
 self.isPresenting = YES;

 return self;
}

- (id)animationControllerForDismissedController:(UIViewController *)dismissed
{
 self.isPresenting = NO;

 return self;
}
</code></pre>

and:

<pre><code>- (NSTimeInterval)transitionDuration:(id)transitionContext
{
 return 0.25;
}

- (void)animateTransition:(id)transitionContext
{
 UIViewController* firstVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
 UIViewController* secondVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
 UIView* containerView = [transitionContext containerView];
 UIView* firstView = firstVC.view;
 UIView* secondView = secondVC.view;

 if (self.isPresenting) {
 [containerView addSubview:secondView];
 secondView.frame = (CGRect){
 containerView.frame.origin.x,
 containerView.frame.origin.y + containerView.frame.size.height,
 containerView.frame.size
 };

 firstView.tintAdjustmentMode = UIViewTintAdjustmentModeDimmed;
 [UIView animateWithDuration:0.25 animations:^{
 secondView.frame = containerView.frame;
 } completion:^(BOOL finished) {
 [transitionContext completeTransition:YES];
 }];
 } else {
 [UIView animateWithDuration:0.25 animations:^{
 firstView.frame = (CGRect){
 containerView.frame.origin.x,
 containerView.frame.origin.y + containerView.frame.size.height,
 containerView.frame.size
 };

 } completion:^(BOOL finished) {
 [transitionContext completeTransition:YES];
 }];
 }
}
</code></pre>

This does a slide-in-from-the-bottom animation mimicking the default modal animation, but you can make it whatever you want.

The important thing is that the presenting view controller's view will remain in the back, letting you create a transparent effect.

This solution works for iOS 7+

blocks|key|463970|text|如果您使用的是模式段，请确保将其设置为此图像(如果需要，您可以关闭动画)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|463971|📷|atomic|offset|length|463972|​|463973|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/cc4fa5accfc0d3a69573f0fdf155581d.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

If you are using modal segue, make sure to set it as this image (you can turn off animation if you want)<img src="https://i.stack.imgur.com/KRNQC.png" alt="enter image description here">

blocks|key|247402|text|创建一个分段来以模态方式呈现，并将该分段的呈现属性设置为覆盖当前上下文，它将100%25工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|247403|​|247404|📷|atomic|offset|length|247405|247406|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/84c32e3e6955472f4d6d768da70d83d7.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Create a segue to present modally and set Presentation property of that segue to over current context
it will work 100 %

<img src="https://i.stack.imgur.com/JthuC.png" alt="enter image description here">

blocks|key|464062|text|在iOS+7和iOS+8上测试的完整方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464063|@interface+UIViewController+(MBOverCurrentContextModalPresenting)

///+@warning+Some+method+of+viewControllerToPresent+will+called+twice+before+iOS+8,+e.g.+viewWillAppear:.
-+(void)MBOverCurrentContextPresentViewController:(UIViewController+*)viewControllerToPresent+animated:(BOOL)flag+completion:(void+(%5E)(void))completion;

@end

@implementation+UIViewController+(MBOverCurrentContextModalPresenting)

-+(void)MBOverCurrentContextPresentViewController:(UIViewController+*)viewControllerToPresent+animated:(BOOL)flag+completion:(void+(%5E)(void))completion+{
++++UIViewController+*presentingVC+=+self;

++++//+iOS+8+before
++++if+(floor(NSFoundationVersionNumber)+<=+NSFoundationVersionNumber_iOS_7_1)+{
++++++++UIViewController+*root+=+presentingVC;
++++++++while+(root.parentViewController)+{
++++++++++++root+=+root.parentViewController;
++++++++}

++++++++[presentingVC+presentViewController:viewControllerToPresent+animated:YES+completion:%5E{
++++++++++++[viewControllerToPresent+dismissViewControllerAnimated:NO+completion:%5E{
++++++++++++++++UIModalPresentationStyle+orginalStyle+=+root.modalPresentationStyle;
++++++++++++++++if+(orginalStyle+!=+UIModalPresentationCurrentContext)+{
++++++++++++++++++++root.modalPresentationStyle+=+UIModalPresentationCurrentContext;
++++++++++++++++}
++++++++++++++++[presentingVC+presentViewController:viewControllerToPresent+animated:NO+completion:completion];
++++++++++++++++if+(orginalStyle+!=+UIModalPresentationCurrentContext)+{
++++++++++++++++++++root.modalPresentationStyle+=+orginalStyle;
++++++++++++++++}
++++++++++++}];
++++++++}];
++++++++return;
++++}

++++UIModalPresentationStyle+orginalStyle+=+viewControllerToPresent.modalPresentationStyle;
++++if+(orginalStyle+!=+UIModalPresentationOverCurrentContext)+{
++++++++viewControllerToPresent.modalPresentationStyle+=+UIModalPresentationOverCurrentContext;
++++}
++++[presentingVC+presentViewController:viewControllerToPresent+animated:YES+completion:completion];
++++if+(orginalStyle+!=+UIModalPresentationOverCurrentContext)+{
++++++++viewControllerToPresent.modalPresentationStyle+=+orginalStyle;
++++}
}

@end|code-block|syntax|javascript|464064|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|$]]

A complete method tested on iOS 7 and iOS 8.

<pre><code>@interface UIViewController (MBOverCurrentContextModalPresenting)

/// @warning Some method of viewControllerToPresent will called twice before iOS 8, e.g. viewWillAppear:.
- (void)MBOverCurrentContextPresentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion;

@end

@implementation UIViewController (MBOverCurrentContextModalPresenting)

- (void)MBOverCurrentContextPresentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
 UIViewController *presentingVC = self;

 // iOS 8 before
 if (floor(NSFoundationVersionNumber) &lt;= NSFoundationVersionNumber_iOS_7_1) {
 UIViewController *root = presentingVC;
 while (root.parentViewController) {
 root = root.parentViewController;
 }

 [presentingVC presentViewController:viewControllerToPresent animated:YES completion:^{
 [viewControllerToPresent dismissViewControllerAnimated:NO completion:^{
 UIModalPresentationStyle orginalStyle = root.modalPresentationStyle;
 if (orginalStyle != UIModalPresentationCurrentContext) {
 root.modalPresentationStyle = UIModalPresentationCurrentContext;
 }
 [presentingVC presentViewController:viewControllerToPresent animated:NO completion:completion];
 if (orginalStyle != UIModalPresentationCurrentContext) {
 root.modalPresentationStyle = orginalStyle;
 }
 }];
 }];
 return;
 }

 UIModalPresentationStyle orginalStyle = viewControllerToPresent.modalPresentationStyle;
 if (orginalStyle != UIModalPresentationOverCurrentContext) {
 viewControllerToPresent.modalPresentationStyle = UIModalPresentationOverCurrentContext;
 }
 [presentingVC presentViewController:viewControllerToPresent animated:YES completion:completion];
 if (orginalStyle != UIModalPresentationOverCurrentContext) {
 viewControllerToPresent.modalPresentationStyle = orginalStyle;
 }
}

@end
</code></pre>

blocks|key|464101|text|这个类别适用于我(ios+7、8和9)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464102|H文件|464103|@interface+UIViewController+(navigation)
-+(void)+presentTransparentViewController:(UIViewController+*)viewControllerToPresent+animated:(BOOL)flag+completion:(void+(%5E)(void))completion;
@end|code-block|syntax|javascript|464104|M文件|464105|@implementation+UIViewController+(navigation)
-+(void)presentTransparentViewController:(UIViewController+*)viewControllerToPresent+animated:(BOOL)flag+completion:(void+(%5E)(void))completion
{
++++if(SYSTEM_VERSION_LESS_THAN(@"8.0"))+{
++++++++[self+presentIOS7TransparentController:viewControllerToPresent+withCompletion:completion];

++++}else{
++++++++viewControllerToPresent.modalPresentationStyle+=+UIModalPresentationOverCurrentContext;
+++++++++[self+presentViewController:viewControllerToPresent+animated:YES+completion:completion];
++++}
}
-(void)presentIOS7TransparentController:(UIViewController+*)viewControllerToPresent+withCompletion:(void(%5E)(void))completion
{
++++UIViewController+*presentingVC+=+self;
++++UIViewController+*root+=+self;
++++while+(root.parentViewController)+{
++++++++root+=+root.parentViewController;
++++}
++++UIModalPresentationStyle+orginalStyle+=+root.modalPresentationStyle;
++++root.modalPresentationStyle+=+UIModalPresentationCurrentContext;
++++[presentingVC+presentViewController:viewControllerToPresent+animated:YES+completion:%5E{
++++++++root.modalPresentationStyle+=+orginalStyle;
++++}];
}
@end|464106|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|$]]

This category worked for me (ios 7, 8 and 9)

H file

<pre><code>@interface UIViewController (navigation)
- (void) presentTransparentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion;
@end
</code></pre>

M file

<pre><code>@implementation UIViewController (navigation)
- (void)presentTransparentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion
{
 if(SYSTEM_VERSION_LESS_THAN(@"8.0")) {
 [self presentIOS7TransparentController:viewControllerToPresent withCompletion:completion];

 }else{
 viewControllerToPresent.modalPresentationStyle = UIModalPresentationOverCurrentContext;
 [self presentViewController:viewControllerToPresent animated:YES completion:completion];
 }
}
-(void)presentIOS7TransparentController:(UIViewController *)viewControllerToPresent withCompletion:(void(^)(void))completion
{
 UIViewController *presentingVC = self;
 UIViewController *root = self;
 while (root.parentViewController) {
 root = root.parentViewController;
 }
 UIModalPresentationStyle orginalStyle = root.modalPresentationStyle;
 root.modalPresentationStyle = UIModalPresentationCurrentContext;
 [presentingVC presentViewController:viewControllerToPresent animated:YES completion:^{
 root.modalPresentationStyle = orginalStyle;
 }];
}
@end
</code></pre>

blocks|key|247568|text|我与XCode+7的界面生成器进行了一点斗争，以设置@VenuGopalTewari建议的演示样式。在这个版本中，似乎没有用于段的Over+Current+Context或Over+Full+Screen演示模式。因此，为了使其正常工作，我将模式设置为Default|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|247569|​|247570|📷|atomic|247571|使用|247572|247573|247574|此外，我将以模态方式呈现的视图控制器的呈现模式设置为Over+Full+Screen|247575|247576|247577|247578|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/ae05376bb485eb9eb199d1aec024203d.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/35355bfb214c52802bae4de8d466c57d.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/0e6aff2c78cee539a1fd21b5dd06777a.png^0|1T|K|2E|G|3I|7|0|0|0|1|0|0|0|0|1|1|0|0|Q|G|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|K|3|L|5|6|7|1I|8|@]|D|@]|E|$]]|$1|M|3|I|5|J|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|N|3|G|5|6|7|1N|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|Q|3|G|5|6|7|1R|8|@]|D|@]|E|$]]|$1|R|3|I|5|J|7|1S|8|@]|D|@$9|1T|A|1U|1|1V]]|E|$]]|$1|S|3|G|5|6|7|1W|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1X|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10|11|-4]]|12|$5|W|X|Y|E|$Z|13|11|-4]]|14|$5|W|X|Y|E|$Z|15|11|-4]]]]

I struggled a bit with the Interface Builder of XCode 7 to set the Presentation Style as @VenuGopalTewari suggested. In this version, there seems to be no <code>Over Current Context</code> or <code>Over Full Screen</code> presentation mode for the segue. Thus, to make it work, I set the mode to <code>Default</code>:

<a href="https://i.stack.imgur.com/hsEiX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hsEiX.png" alt="enter image description here"></a> with 
<a href="https://i.stack.imgur.com/rqyEX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rqyEX.png" alt="enter image description here"></a>

Additionally I set the presentation mode of the modally presented view controller to <code>Over Full Screen</code>:

<a href="https://i.stack.imgur.com/DmeHe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DmeHe.png" alt="enter image description here"></a>

blocks|key|247606|text|这样做的一个非常简单的方法(例如，使用Storyboards+)是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|247607|UIStoryboard+*storyboard+=+[UIStoryboard+storyboardWithName:@"SomeStoryboard"+bundle:nil];
UIViewController+*vc+=+[storyboard+instantiateViewControllerWithIdentifier:@"SomeStoryboardViewController"];
//+the+key+for+what+you're+looking+to+do:
vc.modalPresentationStyle+=+UIModalPresentationOverCurrentContext;
vc.view.alpha+=+0.50f;

[self+presentViewController:vc+animated:YES+completion:%5E{
++++//+great+success
}];|code-block|syntax|javascript|247608|这将以半透明的背景以Storyboard的形式呈现一个UIViewController。|247609|entityMap^0|J|B|0|0|A|A|R|G|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

A very simple way of doing this (using <code>Storyboards</code>, for example) is:

<pre><code>UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"SomeStoryboard" bundle:nil];
UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"SomeStoryboardViewController"];
// the key for what you're looking to do:
vc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
vc.view.alpha = 0.50f;

[self presentViewController:vc animated:YES completion:^{
 // great success
}];
</code></pre>

This will present a <code>UIViewController</code> in a <code>Storyboard</code> modally, but with a translucent background.

blocks|key|464277|text|具有透明背景的PresentViewController+-在iOS+8和iOS+9中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464278|MYViewController+*myVC+=+[self.storyboard+++instantiateViewControllerWithIdentifier:@"MYViewController"];
++++myVC.providesPresentationContextTransitionStyle+=+YES;
++++myVC.definesPresentationContext+=+YES;
++++[myVC+setModalPresentationStyle:UIModalPresentationOverCurrentContext];
++++[self.navigationController+presentViewController:myVC+animated:YES+completion:nil];|code-block|syntax|javascript|464279|并在MYViewController中设置背景颜色为黑色并减少不透明度|464280|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

PresentViewController with Transparent background - in iOS 8 and iOS 9

<pre><code>MYViewController *myVC = [self.storyboard instantiateViewControllerWithIdentifier:@"MYViewController"];
 myVC.providesPresentationContextTransitionStyle = YES;
 myVC.definesPresentationContext = YES;
 [myVC setModalPresentationStyle:UIModalPresentationOverCurrentContext];
 [self.navigationController presentViewController:myVC animated:YES completion:nil];
</code></pre>

And in MYViewController set background color black and reduce opacity

blocks|key|464297|text|为iOS+7-10工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464298|if+#available(iOS+8.0,+*)+{
++++nextVC.modalPresentationStyle+=+.OverCurrentContext
++++self.presentViewController(nextVC,+animated:+true,+completion:+nil)
}+else+{
++++//+Fallback+on+earlier+version
++++self.modalPresentationStyle+=+.Custom++++++++++
++++nextVC.modalTransitionStyle+=+.CrossDissolve++++++++++++
++++self.presentViewController(nextVC,+animated:+false,+completion:+nil)
++++}
}|code-block|syntax|javascript|464299|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|$]]

Working for iOS 7-10

<pre><code>if #available(iOS 8.0, *) {
 nextVC.modalPresentationStyle = .OverCurrentContext
 self.presentViewController(nextVC, animated: true, completion: nil)
} else {
 // Fallback on earlier version
 self.modalPresentationStyle = .Custom 
 nextVC.modalTransitionStyle = .CrossDissolve 
 self.presentViewController(nextVC, animated: false, completion: nil)
 }
}
</code></pre>

blocks|key|464310|text|将导航的modalPresentationStyle设置为UIModalPresentationCustom|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|464311|并将呈现的视图控制器的背景色设置为透明颜色。|464312|entityMap^0|4|M|T|P|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Set navigation's <code>modalPresentationStyle</code> to <code>UIModalPresentationCustom</code>

and set your presented view controller's background color as clear color.

blocks|key|464335|text|使用swift的解决方案如下所示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464336|let+vc+=+MyViewController()
vc.view.backgroundColor+=+UIColor.clear+//+or+whatever+color.
vc.modalPresentationStyle+=+.overCurrentContext
present(vc,+animated:+true,+completion:+nil)|code-block|syntax|javascript|464337|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|$]]

The solution to this answer using swift would be as follows.

<pre><code>let vc = MyViewController()
vc.view.backgroundColor = UIColor.clear // or whatever color.
vc.modalPresentationStyle = .overCurrentContext
present(vc, animated: true, completion: nil)
</code></pre>

blocks|key|464348|text|Swift+4.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|464349|guard+let+someVC+=+UIStoryboard(name:+"Main",+bundle:+nil).instantiateViewController(withIdentifier:+"someVC")+as?+someVC+else+{
++++return
}
someVC.modalPresentationStyle+=+.overCurrentContext

present(someVC,+animated:+true,+completion:+nil)|code-block|syntax|javascript|464350|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|$]]

Swift 4.2

<pre><code>guard let someVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "someVC") as? someVC else {
 return
}
someVC.modalPresentationStyle = .overCurrentContext

present(someVC, animated: true, completion: nil)
</code></pre>

I'm trying to present a view controller modally, with a transparent background. My goal is to let both the presenting and presented view controllers's view to be displayed at the same time. The problem is, when the presenting animation finishes, the presenting view controller's view disappears.

<pre><code>- (IBAction)pushModalViewControllerButtonPressed:(id)sender
{
 ModalViewController *modalVC = [[ModalViewController alloc] init];
 [self presentViewController:modalVC animated:YES completion:nil];
}
</code></pre>

I know I could just add the view as a subview, but I'd like to avoid this solution for some reason. How could I fix it?

iOS: Modal ViewController with transparent background

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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我试图以模态的方式呈现一个具有透明背景的视图控制器。我的目标是让呈现和呈现视图控制器的视图同时显示。问题是，当演示动画结束时，演示视图控制器的视图将消失。- (IBAction)pushModalViewControllerButtonPressed:(id)sender{    ModalViewController...

问iOS:透明背景的模式ViewController
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