iOS Swift弹出视图控制器

Question

I need to have a ViewController slide up, be centered, and overlay the current ViewController. I thought the following code would work but it does not:

let view = storyboard?.instantiateViewControllerWithIdentifier("castSpell") as! CastSpellViewController
view.modalPresentationStyle = .OverCurrentContext
presentViewController(view, animated: true, completion: nil)

The new ViewController is shown but just as a full screen view. I have it's size set to 400x300 in the storyboard. I know I can do the same thing by having a view within a view and then showing the overlay view. Is that the route I need to go?

Answer 1

You need to set the presentation style on the presenter , not the presenting view.

Use self.modalPresentationStyle = .OverCurrentContext

Answer 2

let popOverVC = UIStoryboard(name: "StoryboardName", bundle: nil).instantiateViewControllerWithIdentifier("ViewControllerName") as! PopOverViewContoller
self.addChildViewController(popOverVC)
popOverVC.view.frame = self.containerView.frame
self.containerView.addSubview(popOverVC.view)
popOverVC.didMoveToParentViewController(self)

Use the above code to add viewcontroller as a popover view. The container view is optional. I like using container views when the subviews position is fixed. I can position the container using autolayout and keep it hidden until needed.

In you case, you can place the container/subView at the bottom of the screen from where you need to slide up the subview.

UIView.animateWithDuration(0.5) { () -> Void in
     //Animate here
}

Then change the frame of the container/subview inside the above block of code.

Note : Container view is just a normal UIView. I like naming it container :)