Turning off dimming by UIPopoverController

问题

In iOS7, a popover causes the rest of the screen to be dimmed. As per the Apple docs:

The popover content is layered on top of your existing content and the background is dimmed automatically.

This is nice in most cases, but I have an app where the screen rearranges itself when the popover opens and stays responsive, so the dimming only causes confusion. Anyone knows if dimming can be disabled?

回答1:

Doesn’t look like there’s anything in the API to support that—you can set the passthroughViews property to allow other views to be interacted with while the popover’s open, but that doesn’t affect the dimming. You may have to roll your own popover implementation or find a third-party version.

回答2:

I can suggest you a custom control which is really nice work by its author. It do not dim the background. Further it has many customization.

Here is the github link for WYPopoverController

回答3:

For me at works like this. I just work through all subviews if key window view, find _UIMirrorNinePatchView. _UIMirrorNinePatchView is apple class for that has four image views, these image views create the dimming background for 4 directions of PopOverPresentationController. More specifically you can look at this if you use view hierarchy debugger. So I walk through the array of these UIImageView and set UIImage to nil. This code paste in viewWillAppear of your destination controller(popOverContoller).

NSArray<UIView *> *arrayOfSubviews = [UIApplication sharedApplication].keyWindow.subviews.lastObject.subviews;
for (int i = 0; i < arrayOfSubviews.count; i++) {
if ([NSStringFromClass(arrayOfSubviews[i].class) isEqualToString:@"_UIMirrorNinePatchView"]) {
        arrayOfSubviews[i].backgroundColor = [UIColor clearColor];
        NSArray<UIImageView *> *arrayOfImageViews = arrayOfSubviews[i].subviews;
            for (int j = 0; j < arrayOfImageViews.count; j++) {
                arrayOfImageViews[j].image = nil;
            }
    }
}

In whole my UIPopOverController looks like this And in view debugger, it looks so

So as you can understand, setting UIImage to nil will remove this dimming view.

回答4:

You can prevent the dimming by setting the UIPopoverBackgroundView for your popover and setting the background to be transparent for the background view.

You will need to re-implement how the popover draws the arrows, but you can find plenty of examples for that online.

回答5:

This is the swift version to remove the dimming of UIPopoverController

let allSubViews: [UIView] = (UIApplication.shared.keyWindow?.subviews.last?.subviews)!

        for index in 0...allSubViews.count - 1 {
            allSubViews[index].removeFromSuperview()
                        if NSStringFromClass(allSubViews[index].classForCoder) == "_UIMirrorNinePatchView"
                        {
                            allSubViews[index].backgroundColor = UIColor.clear

                            let arrayofImages = allSubViews[index].subviews as! [UIImageView]

                            for imageIndex in 0...arrayofImages.count - 1 {
                                arrayofImages[imageIndex].image = nil
                            }
                        }
        }

回答6:

If you choose to implement your custom UIPopoverBackgroundView, you can set the layer background to be clear - layer.shadowColor = UIColor.clearColor().CGColor. However this will eliminate the dim and the shadow completely so you will have to put a border around the controller

回答7:

Updated to work in iOS 13 with Swift 4

    guard let transitionSubviews = UIApplication.shared.keyWindow?.subviews.last?.subviews else { return }

    func findViews<T>(inView view: UIView, subclassOf targetType: T.Type) -> [T] {
        return recursiveSubviews(inView: view).compactMap { $0 as? T }
    }

    func recursiveSubviews(inView view: UIView) -> [UIView] {
        return view.subviews + view.subviews.flatMap { recursiveSubviews(inView: $0) }
    }

    for view in transitionSubviews {
        view.backgroundColor = UIColor.clear
        for imageView in findViews(inView: view, subclassOf: UIImageView.self) {
            imageView.image = nil
        }
    }

来源：https://stackoverflow.com/questions/20550550/turning-off-dimming-by-uipopovercontroller

标签

ios

ipad

ios7

uipopovercontroller