Create custom uiview programmatically swift 5

If you need that keyboard to be shown, you should create a class that adopts the UIKeyInput protocol instead, which has just three requirements:. The only other thing you need to know is that your custom input control will show the keyboard when it becomes first responder.

So, you should override the canBecomeFirstResponder property of your subclass, setting it to true rather than the default of false. If you want to handle more complex user input, such as selecting ranges of text or drawing the caret, you should use the more advanced UITextInput protocol instead. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.

Start your free trial! Sponsor Hacking with Swift and reach the world's largest Swift community! This is part of the Swift Knowledge Basea free, searchable collection of solutions for common iOS questions. Start Here. About Hacking with Swift. If you need that keyboard to be shown, you should create a class that adopts the UIKeyInput protocol instead, which has just three requirements: What to do when text is inserted.

What to do when text is deleted. Whether your custom text input currently has text or not. Was this page useful? Let us know! Link copied to your pasteboard.In an update I have planned for one of my apps, I had a need to develop a 5-star rating view so people could rate items they make with the app. As I was working on this control, I thought this might make a good UIView tutorial — especially since it would fit in well with our previous tutorial on how to rate babes with Facebook ;].

First we set up a delegate so we can notify our view controller when the rating changes. Next, we add in the boilerplate code for the construction of our classes. Replace RateView. This is all pretty boilerplate stuff where we initialize our instance variables to default values. Well we need to write a method to refresh the display based on the current rating. Add this method to the file next:. Pretty simple stuff here — we just loop through our list of images and set the appropriate image based on the rating.

Mastering iOS auto layout anchors programmatically from Swift

Probably the most important function in our file is the implementation of layoutSubviews. So add this function next:. But if it is, we just do some simple calculations to figure out how to set the frames for each UIImageView. The images are laid out like the following to fill the entire frame: left margin, image 1, mid margin, So if we know the full size of the frame, we can subtract out the margins and divide by the number of images to figure out how wide to make each of the UIImageViews. Since we don't know the order in which the view controller is going to set our properties especially since they could even change mid-displaywe have to be careful about how we construct our subviews, etc.

This is the approach I took to solve the problem, if anyone else has a different approach I'd love to hear!

So when this changes, we remove any existing image views and create the appropriate amount. Of course, once this happens we need to make sure layoutSubviews and refresh is called, so we call setNeedsLayout and refresh. Similarly, when any of the images or the rating changes, we need to make sure our refresh method gets called so our display is consistent. Our main code is in handleTouchAtLocation, the rest of the methods either call this or notify our delegate that something has changed.

In handleTouchAtLocation, we simply loop through our subviews backwards and compare the x coordinate to that of our subviews.

How to wrap a custom UIView for SwiftUI

Now finally time to try this out! Open MainStoryboard. Now let's connect these to outlets. Bring up the Assistant editor, and make sure that ViewController. Control-drag from the UIView down between the interface and end lines, and connect it to an Outlet named rateView. At this point ViewController.

What about the star images, you might ask? Well feel free to snag a copy of these kermit stars made by my lovely wifeor use your own! Once you have the images, add them to your project, compile and run, and if all works well you should be able to happily rate away!

Here is a sample project with all of the code from the above UIView tutorial. Note that you can also set the other options on the view like dynamically setting the rating or making it editable or not. And feel free to customize it for your own needs as well! What I didn't cover was custom drawing inside the drawRect for the UIView - a very common case as well. Perhaps I'll cover that in a future UIView tutorial! The raywenderlich. Get a weekly digest of our tutorials and courses, and receive a free in-depth email course as a bonus!The internet has many solutions how to define your custom view, but many of them are wrong.

This article covers the right way how it should be done. In this section we will setup UIKit views which will contain out custom view. In this step we set frames manually just for the demonstration purpose. The view remains the same, but we have several problems. There is a misunderstanding that you should setup initial constraints in updateConstraints method.

A boolean flag is used inside a view, but this is a code smell rather than usage of this function as it was intended. Do not do this:. From Apple docs:. It is almost always cleaner and easier to update a constraint immediately after the affecting change has occurred. You should only override this method when changing constraints in place is too slow, or when a view is producing a number of redundant changes. Do not define x, y, width or height inside a custom view.

That is the responsibility of the superview. Instead, use a property called intrinsicContentSize. In our custom view the intrinsic size is being calculated from constraints to contentView, which is a UIImageView, but if our content size depends on some internal criteria use intrinsicContentSize.

What i mean:. The solution is easy enough: make the priority of contentView compression resistance low. Now we can move the entire view:. Today we learned how to compose layout in a custom view and when and where to update constraints.

Full code. Sign in. Custom UIView in Swift done right. Eugene Velizhenkov Follow.

14 Auto Layout Best Practices for Xcode 9 and iOS 11 (using Storyboards)

Noteworthy - The Journal Blog Follow. The Official Journal Blog. Written by Eugene Velizhenkov Follow. See responses 8. More From Medium. My experience with a Dutch Amy Cooper nearly put me in jail.I first started working with iOS fresh out of university. Working with an unfamiliar platform and programming language was challenging. What really made me nervous, was the designs coming from the creative team. I know a great design can breathe new life into a website, but unique high concept designs often require the creation of iOS custom views in UIKit.

As a new developer that was me at the time! Normally, you create views in your storyboards by dragging them from the library to your canvas. This is when you need a custom view.

This element is composed of two text labels the title and subtitle and a circular completion indicator that is intended to fill a gray track as the task progresses.

I like to create my iOS custom views using. We will select CircularProgressBar. It can be an instance of any class you like. With that understood, we will hide the status bar and set the size of the. This way we can change the dimensions so the view has a similar size to the design.

In this case x pixels. We then need to write the following code so CircularProgressBar loads the.

create custom uiview programmatically swift 5

If everything goes well, you should see your custom view rendered in the ViewController:. You can always view the commit on our repository labeled: Stage 1: Rendering view in the interface builder.

So far, we have created a custom UIView that loads a. Now we start getting into the cool stuff: Core Animation layers. CALayer is shorthand for Core Animation: a framework that provides all the tools required to render graphics and animations.

create custom uiview programmatically swift 5

This huge framework can sometimes be overwhelming and impractical so Apple built the simpler UIKit on top of it. When creating custom designs we need to leverage the power of the Cora Animation framework through CALayers. Create a new layer and name it BorderLayer. To do this, we will create a method called commonInit and call it right after loadViewFromNib in our initializers.

The layer is there, but we are not able to see it because it has no size, no color and no drawings on it. This will override layoutSubviews. This method is called when all the sizes have been resolved, the size of your view is going to be its final size. So this is the perfect time to set the size of your layer. Call setNeedsDisplay to notify the system that the content of the layer needs to be redrawn. There is just one thing missing: actually drawing something in the BorderLayer!By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. To create UIView programmatically, I can do it in two different ways. However, I have no understanding as to what the benefits or drawbacks are of each method and which is better.

What are the differences of the two methods? And what do the and! You have declared it as an implicitly unwrapped optional via! What you are really asking about is two slightly different ways to declare a property that can hold a reference to a UIView.

Swift requires that all properties are initialised with a value or declared as optional via?. For example, an IBOutlet UIView property will be initialised when a view controller is loaded from a storyboard, so you can be confident that it will have a value or something is misconfigured and you will get a crashbut that value isn't supplied by the initialiser, so the property needs to be an optional.

Declaring the property as an implicitly unwrapped optional makes the compiler happy even though it can't see where the property is initialised and saves you from having to conditionally unwrap the property each time you refer to it.

Your question is asking about programatically creating a UIViewso the method you use may depend on how you wanted to create the view. If you just want a UIView and you are going to add constraints to it later, you can use:.

However, if you wanted to set up the view based on the frame of the superview, you might do something like this:. Generally it is best to avoid explicitly unwrapped optionals and force unwrapping unless you really are sure that it will have a value. Infact force unwrapping of optionals for UIView is discouraged unless otherwise you are creating your views in storyboards and then connecting them in your view controller as its against the very basic rule of type safety of the Swift language and rule of avoiding unpleasant surprises.

As a basic rule if by doing something you know upfront it has chances of crashing in some circumstances then avoid it as Murphy law is bound to apply Whatever can go wrong will go wrong and thats too at the most inappropriate time. Learn more. Asked 2 years, 8 months ago. Active 2 years, 8 months ago. Viewed 4k times. Any hints would be very appreciated. You did not create an UIView in your second method. You only tell the compiler that you did.

If you try to access that uiview with only that code, your app will crash. Doe Nov 12 '17 at Thanks for your help MannopsonJ. Doe You are half right. The 2nd method does not create a view. But it does not tell the compiler that you did. All it does is declare an implicitly unwrapped optional.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to access the MyCustomView from another class using the following code in ViewController.

The problem is the view does not get initialized in the simulator. The CGRectZero constant is equal to a rectangle at position 0,0 with zero width and height. This is fine to use, and actually preferred, if you use AutoLayout, since AutoLayout will then properly place the view. But, I expect you do not use AutoLayout. So the most simple solution is to specify the size of the custom view by providing a frame explicitly:.

Note that you also need to use addSubview otherwise your view is not added to the view hierarchy. In this line you are trying to set empty rect for your custom view. That's why you cant see your view in simulator. Learn more. How to create custom view programmatically in swift having controls text field, button etc Ask Question.

Asked 5 years, 4 months ago. Active 2 years, 2 months ago. Viewed k times. I have already set class in storyboard for the current ViewController. Center label. Normal btn. TouchUpInside self. Stefan Arentz Are you calling self. Active Oldest Votes. RestingRobot 2, 1 1 gold badge 17 17 silver badges 34 34 bronze badges. Stefan Arentz Stefan Arentz Because in that case the actual placement and size of your view is determined by the Auto Layout Constraints and not by what you pass to the init frame: initializer.

If I have any constraints e. David Seek David Seek Robert 5, 13 13 gold badges 57 57 silver badges bronze badges.

Sateesh Pasala Sateesh Pasala 3 3 silver badges 9 9 bronze badges. Pavel Gatilov Pavel Gatilov 2, 2 2 gold badges 14 14 silver badges 28 28 bronze badges.I already have a comprehensive guide about initializing views and controllersbut that one lacks a very special case: creating a custom view using interface builder.

Using the contents of a xib file is a pretty damn easy task to do.

create custom uiview programmatically swift 5

You can use the following two methods to load the contents aka. The snippet above will simply instantiate a view object from the xib file. You can have multiple root objects in the view hierarchy, but this time let's just pick the first one and use that.

Also you can extend the UIView object with any of the solutions above to create a generic view loader. More on that later This method is pretty simple and cheap, however there is one little drawback.

You can't get named pointers outlets for the views, but only for the root object. If you are putting design elements into your screen, that's fine, but if you need to display dynamic data, you might want to reach out for the underlying views as well.

create custom uiview programmatically swift 5

Inside your custom view object, you instantiate the xib file exactly the same way as I told you right up here. So the initialize method here is just loading the nib file with the owner of self. After the loading process finished, your outlet pointers are going to be filled with proper values from the xib file. There is one last thing that we need to do. Even the views from the xib file are "programmatically" connected to our custom view object, but visually they aren't.

So we have to add our container view into the view hierarchy. If you want to use your custom view object, you just have to create a new instance from it - inside a view controller - and finally feel free to add it as a subview!

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One word about bounds, frames aka. That's two words. They are considered as a bad practice, so please use auto layoutI have a nice tutorial about anchorsthey are amazing and learning them takes about 15 minutes.