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Set aspect ratio constraint programmatically swift

Tag: iosautolayoutuistoryboard. I am trying to figure out how to set the height of a UIimage on the storyboard based on the width? I need it to be a ratio based on the width. So the image is full width. That will add a constraint to always keep your view the same aspect ratio, even as you change the width.

The ball gets reflected symmetrically to its angle of approach assuming it's a completely elastic collision. That means, to get the behavior you are looking for, the ball would need to approach exactly from one line mid-point to the next without any loss of energy.

Sprite Kit's physics engine will There is no default image. So, no, there is no way to do what you want using the image and title properties. However, there are a few options to accomplish Based on the comments on the question, you mentioned that the words will never change. I have put this down as a more efficient alternative and it should hopefully work When a type isn't specified, Swift will create a String instance out of a string literal when creating a variable or constant, no matter the length.

Twilio developer evangelist here. It is possible to build an iOS application to use Just set window. Setting dateStyle or timeStyle will override any custom dateFormat you have set. Your date string does not conform in any way to NSDateFormatterShortStyle, which is why you are getting nil when trying to convert strings to dates. Furthermore, according to Unicode Technical Standard 35 revision 31, the timezone specifier of Seems to be no error in your code, Check that the arrays in plist has the same naming as in your code might be mistaken something with keys.

If you look at the method you have defined in Objective C image category, it is instance method and you are trying to call it using UIImage class in swift. You can basically use either one of the following two approaches, Either, self. It's crashing because your handler object is getting released and deallocated right after the call to handler. The object is getting released and deallocated because nothing is holding a strong reference You'll have to 'remember' which UIViewController calls the object.

This can be done for instance with a property. I think its not possible to use Asset Catalog for video stuff, Its simplify management of images. Apple Documentation Use asset catalogs to simplify management of images that are used by your app as part of its user interface.

An asset catalog can include: Image sets: Used for most types Try transferring everything from plists to the storyboard.The stack view manages the layout of all the views in its arranged Subviews property.

To use a stack view, open the Storyboard you wish to edit. You can continue to add views and controls to your stack, as needed. Interface Builder resizes the stack based on its content.

The stack view uses Auto Layout to position and size its arranged views. For all distributions except the UIStack View. UIStack View. For all alignments except the UIStack View. Although a stack view allows you to layout its contents without using Auto Layout directly, you still need to use Auto Layout to position the stack view, itself.

In general, this means pinning at least two, adjacent edges of the stack view to define its position. Without additional constraints, the system calculates the size of the stack view based on its contents.

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In these cases, the stack view adjusts the layout and size of its arranged views to fill the specified area. See the UIStack View.

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Distribution and UIStack View. Alignment enums for a complete description on how the stack view handles having either extra space or insufficient space for its content. You can also position a stack view based on its first or last baseline, instead of using the top, bottom, or center Y position. A horizontal stack view returns its tallest view for both the for First Baseline Layout and for Last Baseline Layout methods. If the tallest view is also a stack view, it returns the result of calling for First Baseline Layout or for Last Baseline Layout on the nested stack view.

A vertical stack view returns its first arranged view for for First Baseline Layout and its last arranged view for for Last Baseline Layout. If either of these views are also stack views, then it returns the result of calling for First Baseline Layout or for Last Baseline Layout on the nested stack view. Define the position only. Figure 3 shows a stack view with its leading and top edges pinned to its superview.

The stack view sizes and positions its content along its axis to fill the defined space; however, the unpinned edge moves freely, based on the size of the largest arranged view. Figure 4 shows a stack view with the leading, top, and trailing edges pinned to its superview. This lets the stack view grow and shrink along its axis as you add and remove arranged views. Unless you use a fillEqually distribution, the arranged views are sized according to their intrinsic content size.

Figure 5 shows a vertical stack containing four labels and a button. The stack uses 8. Define the size and position of the stack view. In this case, you pin all four edges of the stack view, causing the stack view to lays out its content within the provided space.

Figure 6 shows a vertical stack view with all four edges pinned to its superview. By using the center alignment and fill distribution, the stack view ensures that its content is centered horizontally and vertically fills the screen. However, getting the desired layout with this approach requires a couple of additional steps.

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By default, the stack view vertically stretches the label and not the image view. Adding an equal width constraint between the image view and the stack view helps ensure the image is sized to fill the available space.

Instead, it just manages the position and size of its arranged views.Tag: iosanimationswiftconstraints. I then updated the same constraint in viewDidLoad straight after its declaration in an animation like this:.

In order to declare an animation, you cannot re-define the constraint and call updateConstraintsyou are supposed to change the constant of your constraint and follow the format below:. You can find a lot of example for both ways, here's a few: use a GIF for cool background video cover iOS In reply to your You can get a reference to the view the gesture is added to via its view property.

In this case you are adding it to the button so the view property would return you you the button. Based on the comments on the question, you mentioned that the words will never change. I have put this down as a more efficient alternative and it should hopefully work When a type isn't specified, Swift will create a String instance out of a string literal when creating a variable or constant, no matter the length. When you insert a new cell, set this UITextField's enabled property to true.

When loading all the other cells remember to set it to false to disable editing the same cell maybe used at more than one place The first one mutates the existing NSMutableString. Adds to the end of the receiver the characters of a given string. The second one returns a new NSString which is a concatenation of the receiver and the parameter. Returns a new string made Try transferring everything from plists to the storyboard.

I did this with a friend of mine and it only took about 20 minutes for the code to build and run successfully on his own laptop. Setting dateStyle or timeStyle will override any custom dateFormat you have set.

Your date string does not conform in any way to NSDateFormatterShortStyle, which is why you are getting nil when trying to convert strings to dates. Furthermore, according to Unicode Technical Standard 35 revision 31, the timezone specifier ofBefore iOS6, layout was mainly by autosizing, also known as the "springs and struts" method. In iOS6, we will use AutoLayout, which will make it easier to design interfaces for various sceen sizes.

In this tutorial we will using AutoLayout to keep the aspect ratio of a image while rotating the device. Open Xcode and create a new Single View Application. Make sure only iPhone is selected in Devices, and that the Use Storyboards checkbox is deselected and Use Automatic Reference Counting checkbox is selected. We load an image into the imageview. The translatesAutoresizingMaskIntoConstraints property is set to NO, so our constraints will not conflict with the old "springs and struts" method.

The constraints centers the image View and make the height equal to the screen size.

set aspect ratio constraint programmatically swift

Build and Run. When you rotate the view, the aspect ratio of the view is wrong, because of the height constraint. To fix this we will add a constraint to keep the aspect ratio of our image. Add the constraint at the bottom of the viewDidLoad method. Build and Runrotate the view to Landscape mode. As you can see, the Aspect Ratio is now fixed. Tutorials iOS Development Tutorials. In ViewController.

Change the viewDidLoad method to. Build and Run to see what our initial screen will look like.

Set UIImage height based on a ratio of the width using Autolayout

In Landscape mode the view look like this. Add the following Constraint at the bottom of the viewDidLoad method. Auto Layout in iOS 6: Centering Scaling Views. Send Email iOS Tutorial. Draw Circles iOS Tutorial. Powered by Squarespace.The following calculation for a TV with x resolution makes it more understandable:. First of all you should choose measurement dominant you want to measure width or height Suppose you choose width as dominant.

With introduction of ConstraintLayoutthis solution seems a bit clumsy. Don't forget to add constraint-layout dependency to your module's build. Is there a solution for variable height of the parent object with a ConstraintLayout. Am I doing something wrong? Skip to content. Instantly share code, notes, and snippets. Code Revisions 2 Stars Forks Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP.

ImageView that respects an aspect ratio applied to a specific measurement. Context ; import android. TypedArray ; import android. AttributeSet ; import android. Disabled by default. This will update the view instantly.

Admittedly i did it subliminally for you

This will re-layout the view. This comment has been minimized. Sign in to view. Copy link Quote reply. I think line 48 should be dividing by the aspectRatio, not multiplying. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Context. TypedArray. AttributeSet.

set aspect ratio constraint programmatically swift

ImageView. AspectRatioImageView .All the same Lynda. Plus, personalized course recommendations tailored just for you. All the same access to your Lynda learning history and certifications. Same instructors. New platform. Advance your use of the multiplier with aspect ratio scaling of images. And then I'm gonna take this…and I'm gonna make a new constraint.

Introducing Stack Views in iOS Tutorial: Your First Stack View - boltuneappfigures.pw

That makes a square button. Are you sure you want to mark all the videos in this course as unwatched? This will not affect your course history, your reports, or your certificates of completion for this course. Type in the entry box, then click Enter to save your note. Start My Free Month. You started this assessment previously and didn't complete it. You can pick up where you left off, or start over. Develop in-demand skills with access to thousands of expert-led courses on business, tech and creative topics.

Video: Aspect ratio with multipliers. You are now leaving Lynda. To access Lynda. Visit our help center. Mobile Apps. Preview This Course. Resume Transcript Auto-Scroll. Author Steven Lipton. If you're using Swift Playgrounds or need portable and modular code, programmatic Auto Layout is your prime choice. In this course, instructor Steven Lipton talks about the different options you have to create constraints programmatically in Swift—and how to use each one.

He also shows how to use size classes, stack views, and priorities for the fastest, most adaptable UI on any iOS device. Topics include: When and why to use Auto Layout programmatically Creating constraints in Swift Resolving errors in Auto Layout Using the safe area Working with the Visual Format Language Adding a stack view Harnessing the power of inequalities and priorities in constraints Understanding traits and size classes.

How do I update a constraint programmatically in Swift?

Skill Level Intermediate. Show More Show Less.There are three main options for setting up Auto Layout constraints in Interface Builder: You can control-drag between views, you can use the Pin and Align tools, and you can let Interface Builder set up the constraints for you and then edit or modify the results. Each of these approaches has its own set of strengths and weaknesses.

Most developers find that they prefer one approach over the others; however, being familiar with all three approaches lets you quickly switch between tools based on the task at hand. For all three options, start by dragging your views and controls from the Object library onto the scene. Resize and position them as needed. The app can build and run with the prototyping constraints. Use these constraints to quickly visualize and test a user interface, but then replace the implicit constraints with your own explicit constraints.

Never ship an app with prototyping constraints. As soon as you create your first constraint, the system removes all the prototyping constraints from the views referred to by the constraint. Without the prototyping constraints, your layout no longer has enough constraints to uniquely size and position all the views. It becomes an ambiguous layout. The affected constraints suddenly appear in red, and Xcode generates a number of warnings.

Just keep adding your constraints until your layout is complete. As soon as you add one constraint, you are responsible for adding all the constraints needed to create a nonambiguous, satisfiable layout. For more information on fixing layout warnings and errors, see Debugging Auto Layout.

To create a constraint between two views, Control-click one of the views and drag to the other. When you release the mouse, Interface Builder displays a HUD menu with a list of possible constraints. Interface Builder intelligently selects the set of constraints based on the items you are constraining and the direction of your drag gesture. If you drag more or less horizontally, you get options to set the horizontal spacing between the views, and options to vertically align the views.

If you drag more or less vertically, you get options to set the vertical spacing, and options to align the views horizontally. Therefore, you need to position the views carefully before you draw the constraints.

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If necessary, you can always edit the constraints afterward. If you want finer control, review and edit the constraints after you create them, or use the Pin and Align tools. Interface Builder provides four Auto Layout tools in the bottom-right corner of the Editor window. Use the Pin and Align tools when you want fine control when making constraints or when you want to make multiple constraints at once.

Instead, you can roughly set the relative position of the views, add your constraints, and then update the frames. This lets Auto Layout calculate the correct positions for you. The Stack tool allows you to quickly create a stack view.

Select one or more items in your layout, and then click on the Stack tool. Interface Builder embeds the selected items in a stack view and resizes the stack to its current fitting size based on its contents.

Aspect ratio with multipliers

The Align tool lets you quickly align items in your layout. Select the items you want to align, and then click the Align tool. Interface Builder presents a popover view containing a number of possible alignments. Select the options for aligning the selected views, and click the Add Constraints button. Interface Builder creates the constraints needed to ensure those alignments.

By default, the constraints do not have any offset the edges or centers are aligned with each other and none of the frames are updated when the constraints are added.

set aspect ratio constraint programmatically swift

You can change any of these settings before creating the constraints. You typically select two or more views before using the Align tool.


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