How UIScrollView works?
A floating-point value that determines the rate of deceleration after the user lifts their finger. We can assume that this rate indicates how much the scroll velocity will change after one millisecond (all UIScrollView values are expressed in milliseconds, unlike UIPanGestureRecognizer ).
What is Contentoffset?
The point at which the origin of the content view is offset from the origin of the scroll view.
What is Nslayoutanchor?
A factory class for creating layout constraint objects using a fluent API.
How do I turn off Autolayout in Swift?
Autolayout fights with this at runtime….if it’s xib file:
- select the . xib file.
- select the “File’s Owner”
- show the Utilities.
- click on: “File Inspector”
- Under “Interface Builder Document” disable: “Use Autolayout”
Does contentSize include contentInset?
The contentInset is how much the content is visually inset inside the scroll view (i.e. what the “margins” within the scrollview are). You generally set this once in IB or in viewDidLoad , as the scroll view is instantiated. The contentSize is how big the scrollable content is.
What is leading in Swift?
In this article we will learn about the difference between leading and left, trailing and right constraints in Swift. In short, by setting the leading constraint we set the starting point of a view, while the trailing constraint sets the ending point.
What is intrinsic aspect ratio?
what is an intrinic ratio? So, having an intrinsic ratio in this case means that an element will maintain its aspect ratio when resized – think of an with max-width: 100% for example – change the width of it’s parent and it will change size – but keep the same shape.
Can I use intrinsic content size in auto layout cookbooks?
However, using the intrinsic content size often requires setting the view’s content-hugging and compression-resistance (CHCR) priorities, which can add additional complications. To view the source code for these recipes, see the Auto Layout Cookbook project. This recipe demonstrates laying out a simple label and text field pair.
What is the purpose of the optional constraints in auto layout?
This lets the Auto Layout system dynamically recalculate the layout as the height of the controls change at runtime. Be sure to set the priority of the optional constraints to a value that is lower than the default content hugging constraint (250).
What is a layout guide in auto layout?
This lightweight class represents a rectangular frame that can participate in Auto Layout constraints. Layout guides do not have a graphic context, and they are not part of the view hierarchy. This makes layout guides ideal for grouping items or defining white space.
Can I add a layout Guide to a scene in Interface Builder?
Unfortunately, you cannot add layout guides to a scene in Interface Builder, and mixing programmatically created objects with a storyboard-based scene can become quite complex. As a general rule of thumb, it’s better to use storyboards and Interface Builder, than to use custom layout guides.