问题
There are numerous answers here that describe how to programmatically animate the primary split view:
let addButton = self.splitViewController!.displayModeButtonItem()
UIApplication.sharedApplication().sendAction(addButton.action, to: addButton.target, from: nil, forEvent: nil)
On an iPad this works wonderfully! But on an iPhone there is this annoying gray box that trails the primary view. By wrapping that action in a UIView.animate block, its possible to see it quite clearly:
The box is hardly visible when you actually dismiss the primary view by tapping over the detail view, but is really annoying when you programmatically dismiss it.
How can I remove this annoying view?
回答1:
After banging my head on this for several days, I found a related answer that showed the culprit is the _UIPopoverSlidingChromeView
view. The only solution I could find is similar to the solution of the above topic: to hide that view during the animation.
var foundChrome = false
var view: UIView! = self.view
var popView: UIView!
let displayModeButton = self.splitViewController!.displayModeButtonItem()
while view != nil {
//print("View: ", Mirror(reflecting: view).subjectType, " frame: \(view.frame)")
if let sv = view {
if Mirror(reflecting: sv).description.containsString("Popover") { // _UIPopoverView
for v in sv.subviews {
//print("SV: ", Mirror(reflecting: v).subjectType, " frame: \(v.frame)")
if Mirror(reflecting: v).description.containsString("Chrome") {
foundChrome = true
popView = v
popView.hidden = true
break
}
}
if foundChrome { break }
}
}
view = view.superview
}
if foundChrome {
let duration: NSTimeInterval = 2.0
UIView.animateWithDuration(duration, animations: { () -> Void in
UIApplication.sharedApplication().sendAction(displayModeButton.action, to: displayModeButton.target, from: nil, forEvent: nil)
})
// must do this separately, doing in a completion block doesn't work, as it takes affect too soon
let t = dispatch_time(DISPATCH_TIME_NOW, Int64(duration * NSTimeInterval(NSEC_PER_SEC)))
dispatch_after(t, dispatch_get_main_queue()) {
popView.hidden = false
}
}
I realize this is somewhat esoteric, but if you experience the problem you will be happy for any way to work around it.
来源:https://stackoverflow.com/questions/34167266/hide-gray-box-in-uisplitview-when-animating-to-primaryhidden-from-primaryoverlay