Merge pull request #238 from baekteun/master

support keyboardLayoutGuide

Author: lucdion

.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

@@ -1221,16 +1221,17 @@ This example layout an UIImageView at the top and center it horizontally, it als
 
 
 <a name="safeAreaInsets"></a>
-## safeArea, readable and layout margins
+## safeArea, keyboardMargins, readable and layout margins
 
-UIKit expose 3 kind of areas/guides that can be used to layout views.
+UIKit expose 4 kind of areas/guides that can be used to layout views.
 PinLayout expose them using these properties:
 
 1. **`UIView.pin.safeArea`**: Expose UIKit `UIView.safeAreaInsets` / `UIView.safeAreaLayoutGuide`. 
 2. **`UIView.pin.readableMargins`**: Expose UIKit `UIView.readableContentGuide`. 
 3. **`UIView.pin.layoutMargins`**: Expose UIKit `UIView.layoutMargins` / `UIView.layoutMarginsGuide`. 
+4. **`UIView.pin.keyboardMargins`**: Expose UIKit `UIView.keyboardLayoutGuide`.
 
-The following image display the 3 areas on an iPad in landscape mode. 
+The following image display the 3 areas on an iPad in landscape mode. (safeArea, readableMargins, layoutMargins)
 
 <img src="docs/images/pinlayout_example_layout_margins_landscape.png" width="440" />
 
@@ -1360,6 +1361,22 @@ PinLayout's `UIView.pin.layoutMargins` property expose directly the value of UIK
 
 <br/>
 
+### 4. pin.keyboardMargins:
+
+##### Property:
+* **`pin.keyboardMargins: UIEdgeInset`**
+PinLayout's `UIView.pin.keyboardMargins` property expose directly the value of UIKit [`UIView.keyboardLayoutGuide`](https://developer.apple.com/documentation/uikit/keyboards_and_input/adjusting_your_layout_with_keyboard_layout_guide). This is really useful when layout adjustment due to the keyboard is required.
+
+   Bottom of safe area when the keyboard undocked.
+
+   This property can be used from iOS 15 and above.
+
+##### Usage example:
+```swift
+   container.pin.bottom(view.pin.keyboardMargins.top)
+```
+
+
 <a name="wrapContent"></a>
 ## WrapContent
 
@@ -1624,7 +1641,7 @@ PinLayout can display warnings in the console when pin rules cannot be applied o
 * The newly pinned attributes conflict with other already pinned attributes.   
 Example:  
 `view.pin.left(10).right(10).width(200)`  
-👉 Layout Conflict: `width(200) won't be applied since it conflicts with the following already set properties: left: 0, right: 10.`

+👉 Layout Conflict: `width(200) won't be applied since it conflicts with the following already set properties: left: 0, right: 10.`
 
 * The newly pinned attributes have already been set to another value.  
 Example:  

Example/.DS_Store

@@ -96,7 +96,7 @@ public class PinLayout<View: Layoutable> {
             return .zero
         }
     }
-
+    
     public var readableMargins: PEdgeInsets {
         guard #available(iOS 9.0, *) else { return .zero }
         guard let view = view as? UIView else { return .zero }
@@ -114,6 +114,21 @@ public class PinLayout<View: Layoutable> {
         return view.layoutMargins
     }
     #endif
+    
+    #if os(iOS)
+    public var keyboardMargins: PEdgeInsets {
+        guard #available(iOS 15.0, *) else { return .zero }
+        guard let view = view as? UIView else { return .zero }
+        
+        let layoutFrame = view.keyboardLayoutGuide.layoutFrame
+        guard !layoutFrame.isEmpty else { return .zero }
+        
+        return UIEdgeInsets(top: layoutFrame.origin.y,
+                            left: layoutFrame.origin.x,
+                            bottom: view.frame.height - layoutFrame.origin.y - layoutFrame.height,
+                            right: view.frame.width - layoutFrame.origin.x - layoutFrame.width)
+    }
+    #endif
 
     //
     // MARK: Layout using distances from superview’s edges