What is control state in Iphone?
A control’s state determines its appearance and its ability to support user interactions. Controls can be in one of several states, which the UIControl. State type defines. You can change the state of a control programmatically according to your app’s needs.
What is UIControl state?
UIControlState() is an “empty” control state with some undocumented default value. It just so happens that both of these are backed with a raw value of 0 . So it seems that both represent the “normal” state.
How do I create a custom control in Swift?
It should look like this: To create the class for the knob control, click File ▸ New ▸ File… and select iOS ▸ Source ▸ Cocoa Touch Class. On the next screen, specify the class name as Knob, subclass UIControl and make sure the language is Swift. Click Next, choose the ReusableKnob group and click Create.
What is an IBOutlet?
IBOutlet is a keyword which is added to a variable declaration. It’s an indicator. It does not affect the declaration in any way. However, when the Interface Builder sees it, it will allows a programmer to set this variable through the “outlet” mechanism inside Interface Builder.
Is SwiftUI based on UIKit?
Does SwiftUI replace UIKit? No. Many parts of SwiftUI directly build on top of existing UIKit components, such as UITableView . Of course, many other parts don’t – they are new controls rendered by SwiftUI and not UIKit.
What is the difference between IBAction and IBOutlet?
An IBOutlet is for hooking up a property to a view when designing your XIB. An IBAction is for hooking a method (action) up to a view when designing your XIB. An IBOutlet lets you reference the view from your controller code.
What is the responder chain iOS?
In iOS, the Responder Chain is the name given to an UIKit-generated linked list of UIResponder objects, and is the foundation for everything regarding events (like touch and motion) in iOS.
How do I change the state of a uicontrol?
Controls can be in one of several states, which the UIControl.State type defines. You can change the state of a control programmatically according to your app’s needs. For example, you might disable a control to prevent the user from interacting with it. User interactions can also change the state of a control.
What is the purpose of subclassing uicontrol?
If you subclass UIControl directly, your subclass is responsible for setting up and managing your control’s visual appearance. Use the methods for tracking events to update your control’s state and to send an action when the control’s value changes.
What is the uicontrol class?
The UIControl class is a subclassing point that you extend to implement custom controls. You can also subclass existing control classes to extend or modify their behaviors. For example, you might override the methods of this class to track touch events yourself or to determine when the state of the control changes.
How do I internationalize uicontrol?
Because UIControl is an abstract class, you do not internationalize it specifically. However, you do internationalize the content of subclasses like UIButton. For information about internationalizing a specific control, see the reference for that control. Controls are accessible by default.
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