[Issue-30] animate new height. (#31)

* update view method added

* Animate new height

Author: devkaranCT

Sources/YBottomSheet/Animation/BottomSheetDismissAnimator.swift

@@ -38,7 +38,9 @@ class BottomSheetDismissAnimator: BottomSheetAnimator {
             sheet.dimmerView.alpha = 0
         }
 
-        UIView.animate(with: sheet.appearance.dismissAnimation) {
+        UIView.animate(
+            with: sheet.appearance.dismissAnimation
+        ) {
             if self.isReduceMotionEnabled {
                 sheet.sheetView.alpha = 0
             } else {

Sources/YBottomSheet/Animation/BottomSheetPresentAnimator.swift

@@ -50,7 +50,9 @@ class BottomSheetPresentAnimator: BottomSheetAnimator {
             sheet.dimmerView.alpha = 1
         }
 
-        UIView.animate(with: sheet.appearance.presentAnimation) {
+        UIView.animate(
+            with: sheet.appearance.presentAnimation
+        ) {
             if self.isReduceMotionEnabled {
                 sheet.sheetView.alpha = 1
             } else {

Sources/YBottomSheet/BottomSheetController.swift

@@ -161,6 +161,11 @@ public class BottomSheetController: UIViewController {
             onDismiss()
         }
     }
+    
+    /// update views
+    public func updateViews() {
+       updateViewAppearance()
+    }
 }
 
 internal extension BottomSheetController {
@@ -252,7 +257,16 @@ private extension BottomSheetController {
         let idealHeight = appearance.layout.idealContentHeight ?? childContentSize.height
         if idealHeight > 0.0 {
             if let idealContentHeightAnchor = idealContentHeightAnchor {
-                idealContentHeightAnchor.constant = idealHeight
+                UIView.animate(
+                    withDuration: 0.2,
+                    delay: 0.2,
+                    options: UIView.AnimationOptions.curveEaseIn,
+                    animations: {
+                        idealContentHeightAnchor.constant = idealHeight
+                        self.view.layoutIfNeeded()
+                    },
+                    completion: nil
+                )
             } else {
                 idealContentHeightAnchor = childView.constrain(
                     .heightAnchor,

Tests/YBottomSheetTests/BottomSheetControllerTests.swift

@@ -370,6 +370,17 @@ final class BottomSheetControllerTests: XCTestCase {
         XCTAssertTrue(sut.isDismissed)
     }
 
+    func test_updateView() {
+        let sut = SpyBottomSheetController(title: "", childView: MiniView(), appearance: .defaultResizable)
+        sut.view.layoutIfNeeded()
+        
+        XCTAssertFalse(sut.isViewUpdated)
+
+        sut.updateViews()
+        
+        XCTAssertTrue(sut.isViewUpdated)
+    }
+    
     func test_onSwipeDown() {
         let sut = SpyBottomSheetController(title: "", childView: UIView())
 
@@ -524,6 +535,7 @@ final class SpyBottomSheetController: BottomSheetController {
     var onDimmerTapped = false
     var onDragging = false
     var voiceOverFocusSet = false
+    var isViewUpdated = false
 
     override func simulateTapCloseButton() {
         super.simulateTapCloseButton()
@@ -555,6 +567,11 @@ final class SpyBottomSheetController: BottomSheetController {
         super.viewDidAppear(animated)
         voiceOverFocusSet = true
     }
+    
+    override func updateViews() {
+        super.updateViews()
+        isViewUpdated = true
+    }
 
     @discardableResult
     override func simulateDragging(_ gesture: UIPanGestureRecognizer) -> Bool {