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utilities for safer KVO access in objects

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This commit is contained in:
John Rommel Estropia
2016-12-03 09:59:17 +09:00
parent 5d2956d674
commit 4a282150f0
1 changed files with 29 additions and 5 deletions
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34
Sources/Convenience/NSManagedObject+Convenience.swift
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@@ -87,10 +87,29 @@ public extension NSManagedObject {
public func accessValueForKVCKey(_ KVCKey: KeyPath) -> Any? {
self.willAccessValue(forKey: KVCKey)
let primitiveValue: Any? = self.primitiveValue(forKey: KVCKey)
self.didAccessValue(forKey: KVCKey)
defer {
self.didAccessValue(forKey: KVCKey)
}
return self.primitiveValue(forKey: KVCKey)
}
/**
Provides a convenience wrapper for accessing `primitiveValueForKey(...)` with proper calls to `willAccessValueForKey(...)` and `didAccessValueForKey(...)`. This is useful when implementing accessor methods for transient attributes.
- parameter KVCKey: the KVC key
- parameter accessing: the closure to access the value. This is called between `willAccessValueForKey(...)` and `didAccessValueForKey(...)`
- returns: the primitive value for the KVC key
*/
@nonobjc
public func accessValueForKVCKey(_ KVCKey: KeyPath, _ accessing: (Any?) -> Void) {
return primitiveValue
self.willAccessValue(forKey: KVCKey)
defer {
self.didAccessValue(forKey: KVCKey)
}
accessing(self.primitiveValue(forKey: KVCKey))
}
/**
@@ -98,13 +117,18 @@ public extension NSManagedObject {
- parameter value: the value to set the KVC key with
- parameter KVCKey: the KVC key
- parameter changing: the closure called between `willChangeValueForKey(...)` and `didChangeValueForKey(...)`
*/
@nonobjc
public func setValue(_ value: Any?, forKVCKey KVCKey: KeyPath) {
public func setValue(_ value: Any?, forKVCKey KVCKey: KeyPath, _ changing: (Any?) -> Void = { _ in }) {
self.willChangeValue(forKey: KVCKey)
defer {
self.didChangeValue(forKey: KVCKey)
}
self.setPrimitiveValue(value, forKey: KVCKey)
self.didChangeValue(forKey: KVCKey)
changing(value)
}
/**