iOS : ModalView with background transparent?

问题

I want to show a modalview on a viewController. (which has a naviguation controller).

On my view i have text, and a button to show the modalview.

I created a .xib which contained my modalview (it's a view with an image and a label).

When i show it, with that :

ShareController *controller =  [[ShareController alloc] initWithNibName:@"ShareController" bundle: nil];
controller.view.backgroundColor = [UIColor clearColor];
controller.modalPresentationStyle = UIModalPresentationFormSheet;
controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[self presentViewController:controller animated:YES completion:nil];

i have my modalview, BUT, the background become black.. and i want to see always the text on my view. (i tried to set alpha, etc..; but NOTHING runs :'( )

Someone to help me ?

Thanks,

回答1:

you can check the iOS7 example (see my comm) or you can simple try this:

remove this line from your "presenting" method

controller.view.backgroundColor = [UIColor clearColor];

now, in viewDidLoad of the ShareController add:

 self.view.backgroundColor = [UIColor clearColor];
 self.modalPresentationStyle = UIModalPresentationCurrentContext;
 self.modalPresentationStyle = UIModalPresentationFormSheet;

PS

if you have a navigationController... use

[self.navigationController presentViewController:controller animated:YES completion:nil];

回答2:

Use following snippet to do it on iOS 8 onwards:

For Objective C:

UIViewController *walkThru = [self.storyboard   instantiateViewControllerWithIdentifier:@"WalkThroughScene"];
walkThru.providesPresentationContextTransitionStyle = YES;
walkThru.definesPresentationContext = YES;
[walkThru setModalPresentationStyle:UIModalPresentationOverCurrentContext];
[self.navigationController presentViewController:walkThru animated:YES completion:nil];

For Swift 2 :

let viewController : XYZViewController =     self.storyboard!.instantiateViewControllerWithIdentifier(“XYZIdentifier”) as! XYZViewController
viewController.providesPresentationContextTransitionStyle = true
viewController.definesPresentationContext = true
viewController.modalPresentationStyle=UIModalPresentationStyle.OverCurrentContext
self.presentViewController(viewController, animated: true, completion: nil)

For Swift 4 :

let viewController =  self.storyboard!.instantiateViewController(withIdentifier:  "XYZIdentifier") as! XYZViewController
viewController.providesPresentationContextTransitionStyle = true
viewController.definesPresentationContext = true
viewController.modalPresentationStyle = .overCurrentContext
self.present(viewController, animated: true, completion: nil)

And the backgroundcolor of your presented viewController should be clearColor.

回答3:

If you want your modalVC to be over the tabbar you need to define the presentation style as UIModalPresentationOverFullScreen

[_presentedViewController setModalPresentationStyle:UIModalPresentationOverFullScreen];

[_presentingViewController presentViewController:_presentedViewController animated:YES completion:nil];

回答4:

The quick answer is you cannot present transparent modal view, not with presentViewController:animated:completion: method. Because you cannot make the modal view controller transparent (your view is placer on top of that).

You can make custom view and you can manually animate it, this is a way to create something what you need.

回答5:

In the PresentingViewController copy the below code under storyboard segue or IBAction.

SecondViewController *viewController = [self.storyboard   instantiateViewControllerWithIdentifier:@"secondViewController"];
//SecondViewController *viewController = [SecondViewController alloc]init]; // if you are adding the viewcontroller programatically
viewController.modalPresentationStyle = UIModalPresentationOverCurrentContext;
    [viewController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:viewController animated:YES completion:nil];

In the second ViewController do the following steps either by storyboard or through code:

1. Set the view's (self.view) backgroundcolor to clearcolor and reduce the opacity to 50 %
2. Now you can realize a semi transparent modal view

回答6:

That is the UIWindow's color,you can init the UIWindow color in appDelegate.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    return YES;
}

来源：https://stackoverflow.com/questions/21760698/ios-modalview-with-background-transparent