C# UILabel.SizeThatFits方法代码示例

		public void AddSectionHeader(string name)
		{
			UILabel label = new UILabel();
			label.Text = name.ToUpperInvariant();
			label.Font = Application.ThemeColors.HeaderFont;
			label.TextColor = Application.ThemeColors.Main;

			var y = _container.Subviews.Length == 0 ? _padding : _container.Subviews.Last().Frame.Bottom + _padding;
			label.Frame = new RectangleF(_padding, y, _boxWidthMinusPadding, label.SizeThatFits(new SizeF(_boxWidthMinusPadding, 0)).Height);

			_container.Add(label);
		}

        protected virtual CGSize NativeMeasureContent(CGSize availableSize)
        {
            if (this.contentTemplateInstance != null)
            {
                return this.contentTemplateInstance.MeasureOverride(availableSize);
            }

            var uiContent = this.Content as UIElement;
            if (uiContent != null)
            {
                return uiContent.MeasureOverride(availableSize);
            }

            if (this.textContent != null)
            {
                return this.textContent.MeasureOverride(availableSize);
            }
            var stringContent = this.Content == null ? "" : this.Content.ToString();
            var label = new UILabel();
            label.Text = stringContent;
            return label.SizeThatFits(availableSize);
        }

		UIView CreateBox(float x, float y, float width, float height, string itemChar)
		{
			var item = ViewModel.ListElements.First(l => l.IconChar == itemChar);
			UIView view = new UIView(new RectangleF(0,0, width, height));
			view.Center = new PointF(x + width / 2, y + height / 2);

			view.AddGestureRecognizer(new BoxGestureRecognizer(view));
			view.AddGestureRecognizer(new UITapGestureRecognizer(() => item.GoToCommand.Execute(null)));

			view.BackgroundColor = ColorFor(item);

			UILabel title = new UILabel();
			title.TextColor = UIColor.White;
			title.BackgroundColor = UIColor.Clear;

			if (height < 120) title.Font = Application.ThemeColors.DefaultFont.WithSize(12f);
			else if (height < 200) title.Font = Application.ThemeColors.DefaultFont;
			else title.Font = Application.ThemeColors.TitleFont.WithSize(20f);

			title.Text = item.Title;

			var size = title.SizeThatFits(new SizeF(width, 0));
			var titleX = (width-size.Width) / 2;
			var titleY = height-size.Height-5f;

			title.Frame = new RectangleF(new PointF(titleX,titleY), size);

			view.Add(title);

			var icon = new UILabel();
			icon.BackgroundColor = UIColor.Clear;
			icon.Font = Application.ThemeColors.IconFont.WithSize(height / 3);

			var heightOffset = height < 200 ? -3 : 0;

			icon.TextColor = UIColor.White;
			icon.TextAlignment = UITextAlignment.Center;
			icon.LineBreakMode = UILineBreakMode.CharacterWrap;
			icon.Frame = new RectangleF(0,0, height - 40, height - 40);
			icon.Center = new PointF(width / 2, (height / 2)+heightOffset);
			icon.Text = item.IconChar;

			view.Add(icon);

			return view;

		}

 private static CGSize SizeThatFitsWidth(UILabel label, nfloat width)
 {
     var font = label.Font;
     return label.SizeThatFits(new CGSize(width, font.LineHeight * label.Lines));
 }

        public void UpdateProgressViewSizeForLabel(UILabel label)
        {
            if (Progress < 1)
            {
                var size = label.SizeThatFits(label.Frame.Size);
                var width = size.Width*(float) (1 - Progress);
                var x = label.Center.X + size.Width/2f - width;

                // if we werent able to determine a size, do falsething
                if (size.Width == 0f)
                {
                    return;
                }

                // progressView always covers only the visible portion of the text
                // it "shrinks" to the right with increased progress to reveal more
                // text under it
                ProgressView.Hidden = false;
                //[UIView animateWithDuration:progress > 0.0 ? kUpdateProgressViewDuration : 0.0
                //                 animations:^{
                ProgressView.Frame = new RectangleF(x, ProgressView.Frame.Location.Y, //origin.y,
                                                    BackgroundView.Frame.Size.Width - x, ProgressView.Frame.Size.Height);
            }
            else
            {
                ProgressView.Hidden = true;
            }
        }

		void CreateView ()
		{
			string saveInput = null;

			// If input, than safe text for later use
			if (input != null && inputView != null)
				saveInput = inputView.Text;

			// Remove all existing subviews
			foreach (UIView view in this.View.Subviews) {
				view.RemoveFromSuperview();
			}
			
			// Now create and add all other views
			float frame = 10;
			float maxWidth = this.View.Bounds.Width - 2 * frame;
			float maxHeight = this.View.Bounds.Height;

			UITextAlignment textAlign = UITextAlignment.Center;
			int format = NSUserDefaults.StandardUserDefaults.IntForKey("TextAlignment");

			switch (format) {
			case 0:
				textAlign = UITextAlignment.Center;
				break;
			case 1:
				textAlign = UITextAlignment.Left;
				break;
			case 2:
				textAlign = UITextAlignment.Right;
				break;
			}

			if (image != null) {
				imageView = new UIImageView (UIImage.LoadFromData (NSData.FromArray (image.Data))) {
					ContentMode = UIViewContentMode.Center | UIViewContentMode.ScaleAspectFit
				};
				if (imageView.Image.Size.Width > maxWidth)
					imageView.Bounds = new RectangleF (0, 0, maxWidth, imageView.Image.Size.Height * maxWidth / imageView.Image.Size.Width);
				else
					imageView.Bounds = new RectangleF (0, 0, maxWidth, imageView.Image.Size.Height);
			//				imageView.Bounds = new RectangleF (0, 0, maxWidth, imageView.Bounds.Height);
			} else {
				imageView = null;
			}
			if (!String.IsNullOrEmpty (text)) {
				textView = new UILabel () {
					Text = text,
					BackgroundColor = UIColor.Clear,
					Lines = 0,
					LineBreakMode = UILineBreakMode.WordWrap,
					TextAlignment = textAlign,
					AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight,
					ContentMode = UIViewContentMode.Center
				};
				SizeF size = textView.SizeThatFits (new SizeF (maxWidth, 999999));
				textView.Bounds = new RectangleF (0, 0, maxWidth, size.Height);
			} else {
				textView = null;
			}
			if (input != null && input.InputType == InputType.Text) {
				inputView = new UITextField (new RectangleF (frame, maxHeight - (buttons.Count + 1) * 45, maxWidth, 35)) {
					BorderStyle = UITextBorderStyle.RoundedRect,
					ReturnKeyType = UIReturnKeyType.Done
				};
				inputView.ShouldReturn += inputShouldReturn;
				if (!String.IsNullOrEmpty(saveInput))
				    inputView.Text = saveInput;
			} else {
				inputView = null;
			}

			buttonView = new UIView (){
				ContentMode = UIViewContentMode.Center
			};
			if (buttons != null && buttons.Count > 0) {
				buttonView.Bounds = new RectangleF (0, 0, maxWidth, buttons.Count * 45);
				buttonView.BackgroundColor = UIColor.Clear;
				int pos = 0;
				foreach (string s in buttons) {
					UIButton button = UIButton.FromType (UIButtonType.RoundedRect);
					button.Tag = pos;
					button.Bounds = new RectangleF (0, 0, maxWidth, 35);
					button.Frame = new RectangleF (0, pos * 45, maxWidth, 35);
					button.HorizontalAlignment = UIControlContentHorizontalAlignment.Center;
					button.AutoresizingMask = UIViewAutoresizing.FlexibleTopMargin;
					button.SetTitleColor(Colors.ButtonText,UIControlState.Normal);
					button.SetBackgroundImage(Images.BlueButton, UIControlState.Normal);
					button.SetBackgroundImage(Images.BlueButtonHighlight, UIControlState.Highlighted);
					button.SetTitle (s, UIControlState.Normal);
					button.TouchUpInside += OnTouchUpInside;
					buttonView.AddSubview (button);
					buttonViews.Add (button);
					pos++;
				}
			} else {
				buttonView = null;
			}
			
			// Create scroll view, which holds all other views
//.........这里部分代码省略.........