What is superview in iOS?

What is superview in iOS?

“superview” means the view which holds the current one. “subviews” means the views which are holding by the curent view. For example, you have a view (will call it as MyView) which include a button. Button is a view too (UIButton is a kind of view). So, MyView is superview for the button.

What are iOS constraints?

By default, the system automatically creates a set of constraints based on the view’s frame and its autoresizing mask. When you add your own constraints, they inevitably conflict with the autogenerated constraints. This creates an unsatisfiable layout. In iOS, the system provides the size and layout of the scene.

What is iOS auto layout?

Auto Layout defines your user interface using a series of constraints. Constraints typically represent a relationship between two views. Auto Layout then calculates the size and location of each view based on these constraints. This produces layouts that dynamically respond to both internal and external changes.

When should I call layoutIfNeeded?

You should call layoutIfNeeded before the start of an animation block to ensure all layout updates are propagated before the start of the animation. Configure your new constraints, then inside the animation block, call layoutIfNeeded again to animate to the new state.

What is the SuperView?

The superview is the immediate ancestor of the current view. The value of this property is nil when the view is not installed in a view hierarchy. To set the value of this property, use the addSubview(_:) method to embed the current view inside another view.

What is a super view?

SuperView is GoPro’s name for its widest field of view, or FOV, available when shooting video. It has that distinctive fisheye look that can give an immersive feel, and it’s the perspective we’re most used to when we see GoPro footage. The SuperView FOV is an even wider and more distorted perspective.

What does it mean when a constraint is broken by iOS?

For example imagine a UIView which has 2 height constraints: one says make the UIView 200px high, and the second says make the height twice the height of a button. If the iOS runtime can not satisfy both of these constraints then it has to pick only one. The other is then reported as being “broken” by iOS.

What are size classes in iOS?

In iOS, Size Classes are groups of screen sizes that are applied to the width and height of the device screen. The two Size Classes that exist currently are Compact and Regular. The Compact Size Class refers to a constrained space. It is denoted in Xcode as wC (Compact width) and hC (Compact height).

What is the difference between layoutIfNeeded () and setNeedsLayout ()?

The reason being layoutIfNeeded() forces the view to update immediately, while setNeedsLayout() only updates the view when the animation cycle comes. Thus, it is believed that layoutIfNeeded() is less system friendly as compared to setNeedsLayout().

How do I force layout Subviews?

If you want to force a layout update, call the setNeedsLayout() method instead to do so prior to the next drawing update. If you want to update the layout of your views immediately, call the layoutIfNeeded() method.

What is 1080p SuperView?