NSTextContainer Class
Definition
Important
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Models the geometric layout of a page in Text Kit.
[Foundation.Register("NSTextContainer", true)]
public class NSTextContainer : Foundation.NSObject, Foundation.INSSecureCoding, IDisposable, UIKit.INSTextLayoutOrientationProvider[<Foundation.Register("NSTextContainer", true)>]
type NSTextContainer = class
inherit NSObject
interface INSCoding
interface INativeObject
interface IDisposable
interface INSSecureCoding
interface INSTextLayoutOrientationProvider- Inheritance
- Attributes
- Implements
Remarks
iOS 7 introduced "Text Kit," a broad set of APIs and modifications of existing classes, built on CoreText, that greatly expands the typographical flexibility of iOS.
A NSLayoutManager maintains a list of one or more NSTextContainers in its TextContainers property. The NSLayoutManager lays out the text through these NSTextContainers sequentially. Typically, each container will be handed to a UITextView which will be laid out on the display surface sequentially.
The following example shows text laid out in a two-column format.
var storage = new NSTextStorage();
storage.SetString(attributedString);
var layoutManager = new NSLayoutManager();
storage.AddLayoutManager(layoutManager);
//NSTextContainer defines a logical block (page, column)
var leftHandContainer = new NSTextContainer(size);
layoutManager.AddTextContainer(leftHandContainer);
//Column 1
var leftHandView = new UITextView(new CGRect(new CGPoint(padding, padding), new CGSize(UIScreen.MainScreen.Bounds.Width / 2 - padding * 2, UIScreen.MainScreen.Bounds.Height - padding * 2)), leftHandContainer);
leftHandView.BackgroundColor = UIColor.Green;
leftHandView.ScrollEnabled = false;
AddSubview(leftHandView);
//Column 2
var rightHandContainer = new NSTextContainer(size);
layoutManager.AddTextContainer(rightHandContainer);
var rightHandView = new UITextView(new CGRect(new CGPoint(padding * 2 + size.Width, padding), size), rightHandContainer);
rightHandView.BackgroundColor = UIColor.Red;
AddSubview(rightHandView);
The preceding diagram illustrates the objects directly involved in the two-column layout. The NSTextStorage is the responsibility of some external model class and the two-column user-interface is specified by a custom UIView (TwoColumnView).
A NSTextContainer contains an array of zero or more UIBezierPath objects in its ExclusionPaths property. Text will not be placed within these paths.
Constructors
| Name | Description |
|---|---|
| NSTextContainer() |
Creates a new NSTextContainer with default values. |
| NSTextContainer(CGSize) | |
| NSTextContainer(NativeHandle) |
A constructor used when creating managed representations of unmanaged objects. Called by the runtime. |
| NSTextContainer(NSCoder) |
A constructor that initializes the object from the data stored in the unarchiver object. |
| NSTextContainer(NSObjectFlag) |
Constructor to call on derived classes to skip initialization and merely allocate the object. |
Properties
| Name | Description |
|---|---|
| AccessibilityAttributedUserInputLabels | (Inherited from NSObject) |
| AccessibilityRespondsToUserInteraction | (Inherited from NSObject) |
| AccessibilityTextualContext | (Inherited from NSObject) |
| AccessibilityUserInputLabels | (Inherited from NSObject) |
| Class | (Inherited from NSObject) |
| ClassHandle |
The Objective-C class handle for this class. |
| DebugDescription | (Inherited from NSObject) |
| Description | (Inherited from NSObject) |
| ExclusionPaths |
An array of UIBezierPaths from which text will be excluded. |
| Handle |
Handle (pointer) to the unmanaged object representation. (Inherited from NSObject) |
| HeightTracksTextView |
Whether the NSTextContainer changes its Size as its associated UITextView is resized. |
| IsDirectBinding | (Inherited from NSObject) |
| IsProxy | (Inherited from NSObject) |
| IsSimpleRectangularTextContainer |
Gets a Boolean value that tells whether the receiver's text container is a simply connected rectangular region that has the exact orientation of the text view. |
| LayoutManager | |
| LayoutOrientation | |
| LineBreakMode | |
| LineFragmentPadding |
The amount, in points, by which text is inset within line fragment rectangles. Default is 5.0 points. |
| MaximumNumberOfLines |
The maximum number of lines that can be stored in the receiver. |
| RetainCount | (Inherited from NSObject) |
| Self | (Inherited from NSObject) |
| Size | |
| Superclass | (Inherited from NSObject) |
| SuperHandle |
Handle used to represent the methods in the base class for this NSObject. (Inherited from NSObject) |
| TextLayoutManager | |
| WidthTracksTextView |
Whether the NSTextContainer changes its Size as its associated UITextView is resized. |
| Zone | (Inherited from NSObject) |