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fix UINavigationBar NavigationItems margins >= iOS11
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| // do common initilizer | |
| class BaseNavigationController: UINavigationController { | |
| override func viewDidLayoutSubviews() { | |
| super.viewDidLayoutSubviews() | |
| fixNavigationItemsMargin() | |
| } | |
| override func viewDidAppear(_ animated: Bool) { | |
| super.viewDidAppear(animated) | |
| fixNavigationItemsMargin() | |
| } | |
| } | |
| // do precise layout | |
| class ViewController: UIViewController { | |
| override func viewDidLayoutSubviews() { | |
| super.viewDidLayoutSubviews() | |
| navigationController?.fixNavigationItemsMargin(40) | |
| } | |
| override func viewDidAppear(_ animated: Bool) { | |
| super.viewDidAppear(animated) | |
| navigationController?.fixNavigationItemsMargin(40) | |
| } | |
| } | |
| extension UINavigationController { | |
| func fixNavigationItemsMargin(_ margin: CGFloat = 8) { | |
| let systemMajorVersion = ProcessInfo.processInfo.operatingSystemVersion.majorVersion | |
| if systemMajorVersion >= 11 { | |
| // iOS >= 11 | |
| guard let contentView = navigationBar.subviews | |
| .first( | |
| where: { sub in | |
| String(describing: sub).contains("ContentView") | |
| }) else { return } | |
| // refer to: https://www.matrixprojects.net/p/uibarbuttonitem-ios11/ | |
| // if rightBarButtonItems has not any custom views, then margin would be 8(320|375)/12(414) | |
| // should use customView | |
| let needAdjustRightItems: Bool | |
| if let currentVC = viewControllers.last, | |
| let rightItems = currentVC.navigationItem.rightBarButtonItems, | |
| rightItems.count > 0, | |
| rightItems.filter({ $0.customView != nil }).count > 0 { | |
| needAdjustRightItems = true | |
| } else { | |
| print("Use 8(320|375)/12(414), if need precious margin ,use UIBarButtonItem(customView:)!!!") | |
| needAdjustRightItems = false | |
| } | |
| let needAdjustLeftItems: Bool | |
| if let currentVC = viewControllers.last, | |
| let leftItems = currentVC.navigationItem.leftBarButtonItems, | |
| leftItems.count > 0, | |
| leftItems.filter({ $0.customView != nil }).count > 0 { | |
| needAdjustLeftItems = true | |
| } else { | |
| print("Use 8(320|375)/12(414), if need precious margin ,use UIBarButtonItem(customView:)!!!") | |
| needAdjustLeftItems = false | |
| } | |
| let layoutMargins: UIEdgeInsets | |
| if #available(iOS 11.0, *) { | |
| let directionInsets = contentView.directionalLayoutMargins | |
| layoutMargins = UIEdgeInsets( | |
| top: directionInsets.top, | |
| left: directionInsets.leading, | |
| bottom: directionInsets.bottom, | |
| right: directionInsets.trailing) | |
| } else { | |
| layoutMargins = contentView.layoutMargins | |
| } | |
| contentView.constraints.forEach( | |
| { cst in | |
| // iOS 11 the distance between rightest item and NavigationBar should be margin | |
| // rightStackView trailing space is -margin / 2 | |
| // rightestItem trailing to rightStackView trailing is -margin / 2 | |
| let rightConstant = -margin / 2 | |
| switch (cst.firstAttribute, cst.secondAttribute) { | |
| case (.leading, .leading), (.trailing, .trailing): | |
| if let stackView = cst.firstItem as? UIStackView, | |
| stackView.frame.minX < navigationBar.frame.midX { | |
| // is leftItems | |
| if needAdjustLeftItems { | |
| cst.constant = margin - layoutMargins.left | |
| } | |
| } else if let layoutGuide = cst.firstItem as? UILayoutGuide, | |
| layoutGuide.layoutFrame.minX < navigationBar.frame.midX { | |
| // is leftItems | |
| if needAdjustLeftItems { | |
| cst.constant = margin - layoutMargins.left | |
| } | |
| } | |
| if let stackView = cst.firstItem as? UIStackView, | |
| stackView.frame.maxX > navigationBar.frame.midX { | |
| // is rightItems | |
| if needAdjustRightItems { | |
| cst.constant = rightConstant | |
| } | |
| } else if let layoutGuide = cst.firstItem as? UILayoutGuide, | |
| layoutGuide.layoutFrame.maxX > navigationBar.frame.midX { | |
| // is rightItems | |
| if needAdjustRightItems { | |
| cst.constant = rightConstant | |
| } | |
| } | |
| default: break | |
| } | |
| }) | |
| // ensure items space == 8， minispcae | |
| contentView.subviews.forEach( | |
| { subsub in | |
| guard subsub is UIStackView else { return } | |
| subsub.constraints.forEach( | |
| { cst in | |
| guard cst.firstAttribute == .width | |
| || cst.secondAttribute == .width | |
| else { return } | |
| cst.constant = 0 | |
| }) | |
| }) | |
| } else { | |
| // iOS < 11 | |
| let versionItemsCount: Int | |
| if systemMajorVersion == 10 { | |
| // iOS 10 navigationItem.rightBarButtonItems == 0 | |
| // space = 16(320|375) / 20(414) | |
| // should adjust margin | |
| versionItemsCount = 0 | |
| } else { | |
| // iOS 9 navigationItem.rightBarButtonItems == 0 | |
| // space = 8(320|375) / 12(414) | |
| // should not adjust margin | |
| versionItemsCount = 1 | |
| } | |
| let spaceProducer = { () -> UIBarButtonItem in | |
| let spaceItem = UIBarButtonItem( | |
| barButtonSystemItem: .fixedSpace, | |
| target: nil, | |
| action: nil) | |
| spaceItem.width = margin - 16 | |
| return spaceItem | |
| } | |
| if let currentVC = viewControllers.last, | |
| var rightItems = currentVC.navigationItem.rightBarButtonItems, | |
| rightItems.count > versionItemsCount, | |
| let first = rightItems.first { | |
| // ensure the first BarButtonItem is NOT fixedSpace | |
| if first.title == nil && first.image == nil && first.customView == nil { | |
| print("rightBarButtonItems SPACE SETTED!!! SPACE: ", abs(first.width)) | |
| } else { | |
| rightItems.insert(spaceProducer(), at: 0) | |
| // arranged right -> left | |
| currentVC.navigationItem.rightBarButtonItems = rightItems | |
| } | |
| } | |
| if let currentVC = viewControllers.last, | |
| var leftItems = currentVC.navigationItem.leftBarButtonItems, | |
| leftItems.count > versionItemsCount, | |
| let first = leftItems.first { | |
| if first.title == nil && first.image == nil && first.customView == nil { | |
| print("leftBarButtonItems SPACE SETTED!!! SPACE: ", abs(first.width)) | |
| } else { | |
| leftItems.insert(spaceProducer(), at: 0) | |
| // arranged left -> right | |
| currentVC.navigationItem.leftBarButtonItems = leftItems | |
| } | |
| } | |
| } | |
| } | |
| } | |
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