` | pos As `Point`, eventInfo As `PointerEvent` | | ## Property descriptions

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iOSCanvas.AccessibilityHint **AccessibilityHint** As `Text` The accessibility hint is a longer description that is read aloud when VoiceOver is enabled. ``` xojo Me.AccessibilityHint = "Click to calculate the value and display the next view." ```

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iOSCanvas.AccessibilityLabel **AccessibilityLabel** As `Text` The accessibility label of of a control is a short name that is read aloud when VoiceOver is enabled. ``` xojo Me.AccessibilityLabel = "Calculate the value." ```

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iOSCanvas.Height **Height** As `Double` The height of the control. This property is read-only.

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iOSCanvas.Left **Left** As `Double` The left position of the control. This property is read-only.

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iOSCanvas.Name **Name** As `Text` The name of the control. This can only be set in the Inspector. Use the name to refer to the control. This property is read-only.

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iOSCanvas.Parent **Parent** As `iOSControl` Indicates the control's parent object, if it has one. If there is no parent, this is Nil. This property is read-only.

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iOSCanvas.Top **Top** As `Double` The top position of the control. This property is read-only.

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iOSCanvas.Visible **Visible** As `Boolean` Indicates whether the control is visible. Make a button invisible: ``` xojo Button1.Visible = False ```

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iOSCanvas.Width **Width** As `Double` The width of the control. This property is read-only. ## Method descriptions

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iOSCanvas.AddConstraint **AddConstraint**(constraint As `iOSLayoutConstraint`) Adds a constraint to the control. This constraint is used by child controls that have been added to this control.

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iOSCanvas.AddControl **AddControl**(child As `MobileControl`) Adds a child control to the control.

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iOSCanvas.Control **Control**(index As `Integer`) As `MobileControl` Gets the child control at the specified index.

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iOSCanvas.ControlCount **ControlCount** As `Integer` The number of child controls in the control.

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iOSCanvas.Handle **Handle** As `Ptr` The handle is used to get a reference to the control for interfacing directly with the iOS API.

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iOSCanvas.Invalidate **Invalidate** Marks the control so that it will be redrawn during the next event loop. Call Invalidate to force a Canvas to redraw itself: ``` xojo Canvas1.Invalidate ```

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iOSCanvas.RemoveConstraint **RemoveConstraint**(constraint As `iOSLayoutConstraint`) Removes a constraint from the control.

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iOSCanvas.RemoveControl **RemoveControl**(child As `MobileControl`) Removes the control from the control.

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iOSCanvas.SetTintColor **SetTintColor**(value As `Color`) Changes a control's tint color. This varies by control and for some controls may not do anything. For example, with an `MobileTextField` this changes the cursor color. ## Event descriptions

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iOSCanvas.AppearanceChanged **AppearanceChanged**(dark As `Boolean`) Called when a user switches between Light and Dark mode. Use this event to update any graphics or other UI as needed.

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iOSCanvas.Close **Close** Called when the control is removed from its container, such as a view.

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iOSCanvas.Open **Open** Called after the control is created. This is where you typically put initialization code. Set label text in Open event: ``` xojo Me.Text = "Hello" ```

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iOSCanvas.Paint **Paint**(g As `iOSGraphics`) Called when the Canvas needs to update its graphical display. To draw a blue rectangle in the Canvas: ``` xojo g.FillColor = Color.RGB(0, 0, 255) g.FillRect(0, 0, g.Width, g.Height) ```

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iOSCanvas.PointerDown **PointerDown**(pos As `Point`, eventInfo As `PointerEvent`) Called when the pointing device is tapped, touched or clicked. This code saves all touch points to an array, which is used to display circles in the Paint event: ``` xojo ' mTouches is a property ' mTouches() As Point If eventInfo.PointerCount > 0 Then ' Save multi-touch points For i As Integer = 0 To eventInfo.PointerCount - 1 mTouches.Append(eventInfo.PointerPosition(i)) Next Else mTouches.Append(pos) End If Me.Invalidate ``` This code goes in the Paint event handler: ``` xojo For Each p As Point In mTouches g.FillColor = Color.Blue g.FillOval(p.X, p.Y, 10, 10) Next ```

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iOSCanvas.PointerDrag **PointerDrag**(pos As `Point`, eventInfo As `PointerEvent`) Called when the pointing device is dragged. Saves the drag positions to draw as circles: ``` xojo ' mTouches is a property ' mTouches() As Point mTouches.Append(pos) Me.Invalidate ```

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iOSCanvas.PointerUp **PointerUp**(pos As `Point`, eventInfo As `PointerEvent`) Called when the pointing device is raised or released. This code saves all touch points in an array where circles are displayed: ``` xojo ' mTouches is a property ' mTouches() As Point If eventInfo.PointerCount > 0 Then ' Save multi-touch points For i As Integer = 0 To eventInfo.PointerCount - 1 mTouches.Append(eventInfo.PointerPosition(i)) Next Else mTouches.Append(pos) End If Me.Invalidate ``` ## Compatibility iOS projects on the iOS operating system. ## See also `MobileControl` parent class; `PointerEvent`, `iOSGraphics` classes