Create URLPreviewViewSizer allows to determine reactions view height for a given urlPreviewData and width.

Riot/Modules/Room/Views/URLPreviews/URLPreviewViewSizer.swift

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+// 
+// Copyright 2021 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 Lircense.
+//
+
+import Foundation
+
+/// `URLPreviewViewSizer` allows to determine reactions view height for a given urlPreviewData and width.
+class URLPreviewViewSizer {
+    
+    // MARK: - Constants
+    
+    private static let sizingView = URLPreviewView.instantiate()    
+    
+    // MARK: - Public
+    
+    func height(for urlPreviewData: URLPreviewData, fittingWidth width: CGFloat) -> CGFloat {
+        
+        let sizingView = URLPreviewViewSizer.sizingView
+        
+        sizingView.frame.size.height = 1.0
+        sizingView.preview = urlPreviewData
+        sizingView.availableWidth = width
+        
+        sizingView.setNeedsLayout()
+        sizingView.layoutIfNeeded()
+        
+        let fittingSize = CGSize(width: width, height: UIView.layoutFittingCompressedSize.height)
+        
+        return sizingView.systemLayoutSizeFitting(fittingSize).height
+    }
+}