using System;
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using System.Drawing;
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using Foundation;
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using UIKit;
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namespace HDL_ON_iOS
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{
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public class ViewControllerBase : Shared.BaseViewController
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{
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//public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
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//{
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// return false;
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//}
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NSObject _keyboardObserverWillShow;
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NSObject _keyboardObserverWillHide;
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//public override bool ShouldAutorotate ()
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//{
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// return false;
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//}
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//public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations ()
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//{
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// if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad) {
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// UIApplication.SharedApplication.SetStatusBarOrientation (UIInterfaceOrientation.LandscapeRight, false);
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// return UIInterfaceOrientationMask.LandscapeRight;
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// } else {
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// return UIInterfaceOrientationMask.Portrait;
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// }
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//}
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public override void ViewDidLoad ()
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{
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base.ViewDidLoad ();
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//设置键盘事件处理程序
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RegisterForKeyboardNotifications ();
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}
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protected virtual void RegisterForKeyboardNotifications ()
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{
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_keyboardObserverWillShow = NSNotificationCenter.DefaultCenter.AddObserver
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(UIKeyboard.WillShowNotification, KeyboardWillShowNotification);
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_keyboardObserverWillHide = NSNotificationCenter.DefaultCenter.AddObserver
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(UIKeyboard.WillHideNotification, KeyboardWillHideNotification);
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}
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protected virtual void UnregisterKeyboardNotifications ()
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{
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NSNotificationCenter.DefaultCenter.RemoveObserver (_keyboardObserverWillShow);
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NSNotificationCenter.DefaultCenter.RemoveObserver (_keyboardObserverWillHide);
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}
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protected virtual UIView KeyboardGetActiveView ()
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{
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return this.View.FindFirstResponder ();
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}
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protected virtual void KeyboardWillShowNotification (NSNotification notification)
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{
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UIView activeView = KeyboardGetActiveView ();
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if (activeView == null)
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return;
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UIView scrollView = activeView.FindSuperviewOfType_Self (this.View, typeof (UIView)) as UIView;
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if (scrollView == null)
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return;
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CoreGraphics.CGRect keyboardBounds = UIKeyboard.BoundsFromNotification (notification);
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//UIEdgeInsets contentInsets = new UIEdgeInsets (0.0f, 0.0f, keyboardBounds.Size.Height, 0.0f);
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//scrollView.ContentInset = contentInsets;
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//scrollView.ScrollIndicatorInsets = contentInsets;
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CoreGraphics.CGRect viewRectAboveKeyboard = new CoreGraphics.CGRect (this.View.Frame.Location,
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new CoreGraphics.CGSize (this.View.Frame.Width, this.View.Frame.Size.Height - keyboardBounds.Size.Height));
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CoreGraphics.CGRect activeFieldAbsoluteFrame = activeView.Superview.ConvertRectToView (activeView.Frame, this.View);
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if (!viewRectAboveKeyboard.Contains (activeFieldAbsoluteFrame)) {
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//PointF scrollPoint = new PointF (0.0f,
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// (float)(activeFieldAbsoluteFrame.Location.Y + activeFieldAbsoluteFrame.Height
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// + scrollView.ContentOffset.Y - viewRectAboveKeyboard.Height));
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// scrollView.SetContentOffset (scrollPoint, true);
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scrollView.Bounds = new CoreGraphics.CGRect (0.0f,
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(float)(activeFieldAbsoluteFrame.Location.Y + activeFieldAbsoluteFrame.Height
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+ scrollView.Frame.Y - viewRectAboveKeyboard.Height)
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, this.View.Frame.Width, this.View.Frame.Height);
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}
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//if (this.View.Frame.Height - activeView.Frame.Bottom < keyboardBounds.Size.Height)
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// scrollView.Bounds = new CoreGraphics.CGRect (0.0f, this.View.Frame.Height - activeView.Frame.Height - keyboardBounds.Size.Height, this.View.Frame.Width, this.View.Frame.Height);
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}
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protected virtual void KeyboardWillHideNotification (NSNotification notification)
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{
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UIView activeView = KeyboardGetActiveView ();
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if (activeView == null)
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return;
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UIView scrollView = activeView.FindSuperviewOfType_Self (this.View, typeof (UIView)) as UIView;
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if (scrollView == null)
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return;
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double animationDuration = UIKeyboard.AnimationDurationFromNotification (notification);
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//UIEdgeInsets contentInsets = new UIEdgeInsets (0.0f, 0.0f, 0.0f, 0.0f);
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//UIView.Animate (animationDuration, delegate {
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// scrollView.ContentInset = contentInsets;
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// scrollView.ScrollIndicatorInsets = contentInsets;
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//});
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scrollView.Bounds = new CoreGraphics.CGRect (0.0f, 0.0f, this.View.Frame.Width, this.View.Frame.Height);
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}
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}
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public static class ViewExtensions
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{
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public static UIView FindFirstResponder (this UIView view)
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{
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if (view.IsFirstResponder) {
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return view;
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}
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foreach (UIView subView in view.Subviews) {
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var firstResponder = subView.FindFirstResponder ();
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if (firstResponder != null)
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return firstResponder;
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}
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return null;
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}
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public static UIView FindSuperviewOfType (this UIView view, UIView stopAt, Type type)
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{
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if (view.Superview != null) {
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if (type.IsAssignableFrom (view.Superview.GetType ())) {
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return view.Superview;
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}
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if (view.Superview != stopAt)
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return view.Superview.FindSuperviewOfType (stopAt, type);
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}
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return null;
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}
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public static UIView FindSuperviewOfType_Self (this UIView view, UIView stopAt, Type type)
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{
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if (view.Superview != null) {
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return view.Superview.FindSuperviewOfType_Self (stopAt, type);
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}
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return view;
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}
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}
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}
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