Fail to open a sub space #5965 (#6080)

* Fail to open a sub space #5965

- Fixed

Riot/Modules/TabBar/BreadcrumbView.swift

@@ -0,0 +1,128 @@
+// 
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import UIKit
+
+/// `BreadcrumbView` can be used to display a path into a  single line of text and manages ellipsis.
+@objcMembers
+class BreadcrumbView: UIView, Themable {
+    
+    // MARK: - Constants
+    
+    private enum Constants {
+        static let separator: String = "/"
+    }
+    
+    // MARK: - Properties
+    
+    public var breadcrumbs: [String] = [] {
+        didSet {
+            populateLabels()
+        }
+    }
+    
+    // MARK: - Private
+    
+    private var labels: [UILabel] = []
+    
+    // MARK: - Lifecycle
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+    }
+    
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+    
+    // MARK: - Themable
+    
+    func update(theme: Theme) {
+        for label in labels {
+            update(theme: theme, for: label)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func populateLabels() {
+        for label in labels {
+            label.removeFromSuperview()
+        }
+        
+        labels.removeAll()
+
+        for (index, breadcrumb) in breadcrumbs.enumerated() {
+            if index > 0 {
+                createLabel(with: Constants.separator, at: index)
+            }
+            createLabel(with: breadcrumb, at: index)
+        }
+        self.layoutIfNeeded()
+    }
+    
+    private func createLabel(with text: String?, at index: Int) {
+        guard let text = text, !text.isEmpty else {
+            return
+        }
+        
+        let label = UILabel(frame: .zero)
+        label.backgroundColor = .clear
+        label.text = text
+        let priority: UILayoutPriority
+        if index < breadcrumbs.count - 1 {
+            // We put a higher priority to the first element then decrease the priority linearly for the next elements.
+            priority = UILayoutPriority(UILayoutPriority.defaultLow.rawValue + Float(breadcrumbs.count * 2 - labels.count))
+        } else {
+            // The last element has the highest priority
+            priority = .defaultHigh
+        }
+        label.setContentCompressionResistancePriority(priority, for: .horizontal)
+        
+        update(theme: ThemeService.shared().theme, for: label)
+
+        self.addSubview(label)
+        self.labels.append(label)
+        
+        label.translatesAutoresizingMaskIntoConstraints = false
+        label.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor).isActive = true
+        label.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor).isActive = true
+        
+        if let prevSibling = prevSibling(of: label) {
+            label.leadingAnchor.constraint(equalTo: prevSibling.trailingAnchor).isActive = true
+        } else {
+            label.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor).isActive = true
+        }
+        
+        if index == breadcrumbs.count - 1 && label.text != Constants.separator {
+            label.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor).isActive = true
+        }
+    }
+    
+    private func prevSibling(of label: UILabel) -> UILabel? {
+        guard let index = labels.firstIndex(of: label), index - 1 >= 0 else {
+            return nil
+        }
+        
+        return labels[index-1]
+    }
+    
+    private func update(theme: Theme, for label: UILabel) {
+        label.textColor = theme.colors.tertiaryContent
+        label.font = theme.fonts.footnote
+    }
+}