Create KeyboardAvoider that help to avoid keyboard overlap with scroll view content.

2026-04-20 00:24:43 +02:00 · 2019-01-22 00:18:54 +01:00
parent d69fb8e3f9
commit 4f24080249
2 changed files with 195 additions and 0 deletions
@@ -0,0 +1,65 @@
+/*
+ Copyright 2018 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 UIKit
+
+/// Wrapper for the Notification userInfo values associated with a keyboard notification.
+public struct KeyboardNotification {
+    
+    let userInfo: [AnyHashable: Any]
+    
+    public init?(notification: Notification) {
+        guard let userInfo = notification.userInfo else {
+            return nil
+        }
+        self.userInfo = userInfo
+    }
+    
+    public var keyboardFrameBegin: CGRect? {
+        guard let value = userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue else {
+            return nil
+        }
+        return value.cgRectValue
+    }
+    
+    public var keyboardFrameEnd: CGRect? {
+        guard let value = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue else {
+            return nil
+        }
+        return value.cgRectValue
+    }
+    
+    public var animationDuration: TimeInterval? {
+        guard let number = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber else {
+            return nil
+        }
+        return number.doubleValue
+    }
+    
+    /// Keyboard UIViewAnimationCurve enum raw value
+    public var animationCurveRawValue: Int? {
+        guard let number = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber else {
+            return nil
+        }
+        return number.intValue
+    }
+    
+    /// Convert UIViewAnimationCurve raw value to UIViewAnimationOptions
+    public func animationOptions(fallbackAnimationCurveValue: Int = UIViewAnimationCurve.easeInOut.rawValue) -> UIViewAnimationOptions {
+        let animationCurveRawValue = self.animationCurveRawValue ?? fallbackAnimationCurveValue
+        return UIViewAnimationOptions(rawValue: UInt(animationCurveRawValue << 16))
+    }
+}