Merge pull request #471 from ThomasDhaen/master

iOS Safe Area implementation

Author: aritchie

src/Acr.UserDialogs.iOS/AIDatePickerController.cs

@@ -8,6 +8,8 @@ namespace AI
     [Register ("AIDatePickerController")]
 	public class AIDatePickerController : UIViewController, IUIViewControllerAnimatedTransitioning, IUIViewControllerTransitioningDelegate
 	{
+        private UIEdgeInsets safeAreaInsets;
+
         public double AnimatedTransitionDuration { get; set; } = 0.4;
 		public UIDatePickerMode Mode { get; set; } = UIDatePickerMode.Date;
 	    public UIColor BackgroundColor { get; set; } = UIColor.White;
@@ -31,7 +33,9 @@ public AIDatePickerController()
         {
             //this.ModalPresentationStyle = UIModalPresentationStyle.Custom;
             this.ModalPresentationStyle = UIModalPresentationStyle.OverCurrentContext;
-            this.TransitioningDelegate = this;            
+            this.TransitioningDelegate = this;        
+
+            SetupSafeAreaInsets();
         }
 
 
@@ -165,9 +169,21 @@ public override void ViewDidLoad()
 			this.View.AddConstraints(NSLayoutConstraint.FromVisualFormat("H:|-5-[DatePickerContainerView]-5-|", 0, null, views));
 			this.View.AddConstraints(NSLayoutConstraint.FromVisualFormat("H:|-5-[ButtonContainerView]-5-|", 0, null, views));
 
-			this.View.AddConstraints(NSLayoutConstraint.FromVisualFormat("V:|[DismissButton][DatePickerContainerView]-10-[ButtonContainerView(40)]-5-|", 0, null, views));
+            this.View.AddConstraints(NSLayoutConstraint.FromVisualFormat($"V:|[DismissButton][DatePickerContainerView]-10-[ButtonContainerView(40)]-{5 + safeAreaInsets.Bottom}-|", 0, null, views));
 		}
 
+        private void SetupSafeAreaInsets()
+        {
+            if(UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
+            {
+                safeAreaInsets = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
+            }
+            else
+            {
+                safeAreaInsets = new UIEdgeInsets();
+            }
+        }
+
 		public double TransitionDuration(IUIViewControllerContextTransitioning transitionContext)
 		{
 			return AnimatedTransitionDuration;

src/Acr.UserDialogs.iOS/TTGSnackbar.cs

@@ -28,11 +28,11 @@ public class TTGSnackbar : UIView
         // Snackbar icon imageView default width
         private const float snackbarIconImageViewWidth = 32;
 
+        private UIEdgeInsets safeAreaInsets;
+
         public Action<TTGSnackbar> ActionBlock { get; set; }
         public Action<TTGSnackbar> SecondActionBlock { get; set; }
 
-
-        public nfloat TopMargin { get; set; } = 8;
         /// <summary>
         /// Snackbar display duration. Default is 3 seconds.
         /// </summary>
@@ -61,12 +61,55 @@ public nfloat CornerRadius
             }
         }
 
-        public nfloat LeftMargin { get; set; } = 4;
-        public nfloat RightMargin { get; set; } = 4;
+        nfloat topMargin = 8;
+        public nfloat TopMargin
+        {
+            get
+            {
+                return topMargin + safeAreaInsets.Top;
+            }
+            set
+            {
+                topMargin = value;
+            }
+        }
 
+        nfloat leftMargin = 4;
+        public nfloat LeftMargin
+        {
+            get
+            {
+                return leftMargin + safeAreaInsets.Left;
+            }
+            set
+            {
+                leftMargin = value;
+            }
+        }
+
+        nfloat rightMargin = 4;
+        public nfloat RightMargin
+        {
+            get
+            {
+                return rightMargin + safeAreaInsets.Right;
+            }
+            set
+            {
+                rightMargin = value;
+            }
+        }
 
         /// Bottom margin. Default is 4
-        public nfloat BottomMargin { get; set; } = 4;
+        nfloat bottomMargin = 4;
+        public nfloat BottomMargin { 
+            get {
+                return bottomMargin + safeAreaInsets.Bottom;
+            } 
+            set {
+                bottomMargin = value;
+            } 
+        } 
         public nfloat Height { get; set; } = 44;
 
 
@@ -152,6 +195,8 @@ public TTGSnackbar() : base(CoreGraphics.CGRect.FromLTRB(0, 0, 320, 44))
             this.Layer.CornerRadius = 4;
             this.Layer.MasksToBounds = true;
 
+            SetupSafeAreaInsets();
+
             this.MessageLabel = new UILabel
             {
                 TranslatesAutoresizingMaskIntoConstraints = false,
@@ -294,6 +339,18 @@ public TTGSnackbar() : base(CoreGraphics.CGRect.FromLTRB(0, 0, 320, 44))
             //this.AddConstraints(hConstraintsForActivityIndicatorView);
         }
 
+        private void SetupSafeAreaInsets()
+        {
+            if(UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
+            {
+                safeAreaInsets = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
+            }
+            else
+            {
+                safeAreaInsets = new UIEdgeInsets();
+            }
+        }
+
         /// <summary>
         /// Show the snackbar
         /// </summary>
@@ -364,7 +421,7 @@ public void Show()
                     localSuperView,
                     NSLayoutAttribute.Bottom,
                     1,
-                    -BottomMargin);
+                    -BottomMargin );
 
                 // Avoid the "UIView-Encapsulated-Layout-Height" constraint conflicts
                 // http://stackoverflow.com/questions/25059443/what-is-nslayoutconstraint-uiview-encapsulated-layout-height-and-how-should-i