custom toast for ios

2025-12-15 07:43:37 +00:00 · 2017-12-22 16:18:16 -05:00
parent f897193f79
commit 839df123ff
5 changed files with 167 additions and 14 deletions
--- a/src/iOS.Core/Views/Toast.cs
+++ b/src/iOS.Core/Views/Toast.cs
@@ -0,0 +1,135 @@
+using Foundation;
+using System;
+using UIKit;
+
+namespace Bit.iOS.Core.Views
+{
+    public class Toast : UIView
+    {
+        // Timer to dismiss the snack bar.
+        private NSTimer _dismissTimer;
+
+        // Constraints.
+        private NSLayoutConstraint _heightConstraint;
+        private NSLayoutConstraint _leftMarginConstraint;
+        private NSLayoutConstraint _rightMarginConstraint;
+        private NSLayoutConstraint _topMarginConstraint;
+        private NSLayoutConstraint _bottomMarginConstraint;
+
+        public Toast(string text) : base(CoreGraphics.CGRect.FromLTRB(0, 0, 320, 44))
+        {
+            TranslatesAutoresizingMaskIntoConstraints = false;
+            BackgroundColor = UIColor.DarkGray;
+            Layer.CornerRadius = 4;
+            Layer.MasksToBounds = true;
+
+            MessageLabel = new UILabel
+            {
+                TranslatesAutoresizingMaskIntoConstraints = false,
+                TextColor = UIColor.White,
+                Font = UIFont.SystemFontOfSize(14),
+                BackgroundColor = UIColor.Clear,
+                LineBreakMode = UILineBreakMode.WordWrap,
+                TextAlignment = UITextAlignment.Center,
+                Lines = 0
+            };
+
+            var hConstraints = NSLayoutConstraint.FromVisualFormat("H:|-5-[messageLabel]-5-|", 0, new NSDictionary(),
+                NSDictionary.FromObjectsAndKeys(new NSObject[] { MessageLabel },
+                    new NSObject[] { new NSString("messageLabel") })
+            );
+
+            var vMessageConstraints = NSLayoutConstraint.FromVisualFormat("V:|-0-[messageLabel]-0-|", 0, new NSDictionary(),
+                NSDictionary.FromObjectsAndKeys(new NSObject[] { MessageLabel },
+                    new NSObject[] { new NSString("messageLabel") })
+            );
+
+            AddConstraints(hConstraints);
+            AddConstraints(vMessageConstraints);
+            AddSubview(MessageLabel);
+        }
+
+        public TimeSpan Duration { get; set; } = TimeSpan.FromSeconds(3);
+        public UILabel MessageLabel { get; set; }
+        public nfloat LeftMargin { get; set; } = 4;
+        public nfloat RightMargin { get; set; } = 4;
+        public nfloat BottomMargin { get; set; } = 4;
+        public nfloat Height { get; set; } = 44;
+        public nfloat TopMargin { get; set; } = 8;
+
+        public void Show()
+        {
+            if(Superview != null)
+            {
+                return;
+            }
+
+            _dismissTimer = NSTimer.CreateScheduledTimer(Duration, x => Dismiss());
+            LayoutIfNeeded();
+
+            var localSuperView = UIApplication.SharedApplication.KeyWindow;
+            if(localSuperView != null)
+            {
+                localSuperView.AddSubview(this);
+
+                _heightConstraint = NSLayoutConstraint.Create(this, NSLayoutAttribute.Height,
+                    NSLayoutRelation.GreaterThanOrEqual, null, NSLayoutAttribute.NoAttribute, 1, Height);
+
+                _leftMarginConstraint = NSLayoutConstraint.Create(this, NSLayoutAttribute.Left, NSLayoutRelation.Equal,
+                    localSuperView, NSLayoutAttribute.Left, 1, LeftMargin);
+
+                _rightMarginConstraint = NSLayoutConstraint.Create(this, NSLayoutAttribute.Right, NSLayoutRelation.Equal,
+                    localSuperView, NSLayoutAttribute.Right, 1, -RightMargin);
+
+                _bottomMarginConstraint = NSLayoutConstraint.Create(this, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal,
+                    localSuperView, NSLayoutAttribute.Bottom, 1, -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
+                _leftMarginConstraint.Priority = 999;
+                _rightMarginConstraint.Priority = 999;
+
+                AddConstraint(_heightConstraint);
+                localSuperView.AddConstraint(_leftMarginConstraint);
+                localSuperView.AddConstraint(_rightMarginConstraint);
+                localSuperView.AddConstraint(_bottomMarginConstraint);
+
+                // Show
+                ShowWithAnimation();
+            }
+            else
+            {
+                Console.WriteLine("Toast needs a keyWindows to display.");
+            }
+        }
+
+        public void Dismiss(bool animated = true)
+        {
+            _dismissTimer?.Invalidate();
+            _dismissTimer = null;
+            nfloat superViewWidth = 0;
+
+            if(Superview != null)
+            {
+                superViewWidth = Superview.Frame.Width;
+            }
+
+            if(!animated)
+            {
+                RemoveFromSuperview();
+                return;
+            }
+
+            SetNeedsLayout();
+            Animate(0.3f, 0, UIViewAnimationOptions.CurveEaseIn, () => { Alpha = 0; }, RemoveFromSuperview);
+        }
+
+        private void ShowWithAnimation()
+        {
+            _bottomMarginConstraint.Constant = -BottomMargin;
+            _leftMarginConstraint.Constant = LeftMargin;
+            _rightMarginConstraint.Constant = -RightMargin;
+            AnimateNotify(0.3f, 0, 0.7f, 5f, UIViewAnimationOptions.CurveEaseInOut, () => { Alpha = 0; }, null);
+        }
+    }
+}