Implement Actions
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enhancement
- 主要语言
- Swift
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描述
# [CAAction](https://developer.apple.com/documentation/quartzcore/caaction)
```swift
func action(forKey: String) -> CAAction?
Returns the action object assigned to the specified key.
var actions: [String : CAAction]?
A dictionary containing layer actions.
```
> Action Identifiers
These constants are the predefined action identifiers used by action(forKey:), add(_:forKey:), defaultAction(forKey:), removeAnimation(forKey:), Layer Filters, and the CAAction protocol method run(forKey:object:arguments:).
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