When to use CATransaction?
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When to use CATransaction?
The job of CATransaction is to group multiple animation-related actions together. It ensures that the desired animation changes are committed to Core Animation at the same time. Here we begin a transaction and can change any Core Animation enabled properties, which will be animated alongside each other once committed.
What is CATransaction?
CATransaction is the Core Animation mechanism for batching multiple layer-tree operations into atomic updates to the render tree. Every modification to a layer tree must be part of a transaction. Nested transactions are supported.
How do I animate a view in Swift 4?
swift file just above the viewDidLoad method. Name the view blueView and hit connect. Next, connect the Animate button below the viewDidLoad() method….Animating View Properties
- Position & Size consists of the bounds, frame and centre of a view.
- Appearance consists of the background color and alpha of a view.
What is Core Animation in Swift?
Core Animation is a graphics rendering and animation infrastructure available on both iOS and OS X that you use to animate the views and other visual elements of your app. With Core Animation, most of the work required to draw each frame of an animation is done for you.
What is QuartzCore?
QuartzCore, also known as CoreAnimation, is a framework used by macOS and iOS to create animatable scene graphics. CoreAnimation uses a unique rendering model where the graphics operations are run in a separate process. On macOS, the process is WindowServer.
Does UIView animate need weak self?
You don’t need to use [weak self] in static function UIView. animate() You need to use weak when retain cycle is possible and animations block is not retained by self.
Does SwiftUI use Core Animation?
SwiftUI uses Core Animation for rendering by default, and its performance is great for most animations. But if you find yourself creating a very complex animation that seems to suffer from lower framerates, you may want to utilize the power of Metal, which is Apple’s framework used for working directly with the GPU.
What is a CALayer?
A CALayer is a layer in the composition stack which goes on top of some layers, and potentially underneath other layers. (e.g. an image in a button in a table cell in a view in a split view, etc.)
What is core graphics in iOS?
The Core Graphics framework is based on the Quartz advanced drawing engine. It provides low-level, lightweight 2D rendering with unmatched output fidelity.
When should you use quartz2d?
You can use the Quartz 2D application programming interface (API) to gain access to features such as path-based drawing, painting with transparency, shading, drawing shadows, transparency layers, color management, anti-aliased rendering, PDF document generation, and PDF metadata access.
What is Quartzcore in Swift?
512. An Objective-C framework used by macOS and iOS to produce animated user interfaces. Also known as Core Animation.
Why do we use unowned and weak self?
In general, be very careful when using unowned. It could be that you’re accessing an instance that is no longer there, causing a crash. The only benefit of using unowned over weak is that you don’t have to deal with optionals. Therefore, using weak is always safer in those scenarios.
How do I animate in SwiftUI?
SwiftUI has built-in support for animations with its animation() modifier. To use this modifier, place it after any other modifiers for your views, tell it what kind of animation you want, and also make sure you attach it to a particular value so the animation triggers only when that specific value changes.
