Can you subclass uibutton

Create your UIButton subclass with a custom initializer This solution allows you to create instances of your UIButton subclass with the appropriate value for your property.

Create your UIButton subclass with a convenience initializer This solution allows you to create instances of your UIButton subclass with the appropriate value for your property.

Create your UIButton subclass with init? Create your UIButton subclass with a default property value for your property As an alternative to the previous solutions, you can assign an initial value to your property outside of the initializers.

Improve this answer. Imanou Petit Imanou Petit I like that you gave scenarios of why to use each code snippet. Phenomenal response - wish more questions were answered like this. How to call convenience init if the button is an outlet? In the usage part of snippet 3, where a frame is used as the initialiser, it would be clearer to use something like CustomButton frame: CGRect x: , y: , width: , height: 50 rather than CustomButton frame:. Nate Cook Nate Cook Ah great so i just have to declare and give the variable a init value!

You need a question mark after init in Swift 2. Custom default. You want to insert 'public' in there. Not, of course. Read that public is the scope between projects. Sign up or log in Sign up using Google. Sign up using Facebook.

In the rare instances where you need your code to run during the layout process, you may need to subclass a UIKit control in order to override this method. The methods are as follows:. Articles Series Workshops About.

Instead of subclassing UIKit controls, opt for one of the following approaches: Configuration If your requirements can be achieved by styling the component using its public API, use that when you declare the variable. Customization Sometimes, you need to compose multiple views together in order to achieve the desired result. Exceptions There are situations where subclassing is necessary, which revolves around API that require subclassing.

This constructor is not invoked when deserializing objects from storyboards or XIB filesinstead the constructor that takes an NSCoder parameter is invoked. This constructor is provided to allow the class to be initialized from an unarchiver for example, during NIB deserialization. This is part of the NSCoding protocol. If developers want to create a subclass of this object and continue to support deserialization from an archive, they should implement a constructor with an identical signature: taking a single parameter of type NSCoder and decorate it with the [Export "initWithCoder:"] attribute declaration.

This constructor should be called by derived classes when they completely construct the object in managed code and merely want the runtime to allocate and initialize the NSObject. This is required to implement the two-step initialization process that Objective-C uses, the first step is to perform the object allocation, the second step is to initialize the object.

When developers invoke the constructor that takes the NSObjectFlag. Empty they take advantage of a direct path that goes all the way up to NSObject to merely allocate the object's memory and bind the Objective-C and C objects together. The actual initialization of the object is up to the developer. This constructor is typically used by the binding generator to allocate the object, but prevent the actual initialization to take place. Once the allocation has taken place, the constructor has to initialize the object.

With constructors generated by the binding generator this means that it manually invokes one of the "init" methods to initialize the object. It is the developer's responsibility to completely initialize the object if they chain up using the NSObjectFlag.

Empty path. In general, if the developer's constructor invokes the NSObjectFlag. Empty base implementation, then it should be calling an Objective-C init method.