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support generics for KVC accessors

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John Rommel Estropia
2016-12-03 10:13:50 +09:00
parent 4a282150f0
commit e330291e1b
1 changed files with 25 additions and 6 deletions
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31
Sources/Convenience/NSManagedObject+Convenience.swift
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@@ -98,18 +98,19 @@ public extension NSManagedObject {
Provides a convenience wrapper for accessing `primitiveValueForKey(...)` with proper calls to `willAccessValueForKey(...)` and `didAccessValueForKey(...)`. This is useful when implementing accessor methods for transient attributes. 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 KVCKey: the KVC key
- parameter accessing: the closure to access the value. This is called between `willAccessValueForKey(...)` and `didAccessValueForKey(...)` - parameter didAccessPrimitiveValue: the closure to access the value. This is called between `willAccessValueForKey(...)` and `didAccessValueForKey(...)`
- returns: the primitive value for the KVC key - returns: the primitive value for the KVC key
*/ */
@discardableResult
@nonobjc @nonobjc
public func accessValueForKVCKey(_ KVCKey: KeyPath, _ accessing: (Any?) -> Void) { public func accessValueForKVCKey<T>(_ KVCKey: KeyPath, _ didAccessPrimitiveValue: (Any?) throws -> T) rethrows -> T {
self.willAccessValue(forKey: KVCKey) self.willAccessValue(forKey: KVCKey)
defer { defer {
self.didAccessValue(forKey: KVCKey) self.didAccessValue(forKey: KVCKey)
} }
accessing(self.primitiveValue(forKey: KVCKey)) return try didAccessPrimitiveValue(self.primitiveValue(forKey: KVCKey))
} }
/** /**
@@ -117,10 +118,9 @@ public extension NSManagedObject {
- parameter value: the value to set the KVC key with - parameter value: the value to set the KVC key with
- parameter KVCKey: the KVC key - parameter KVCKey: the KVC key
- parameter changing: the closure called between `willChangeValueForKey(...)` and `didChangeValueForKey(...)`
*/ */
@nonobjc @nonobjc
public func setValue(_ value: Any?, forKVCKey KVCKey: KeyPath, _ changing: (Any?) -> Void = { _ in }) { public func setValue(_ value: Any?, forKVCKey KVCKey: KeyPath) {
self.willChangeValue(forKey: KVCKey) self.willChangeValue(forKey: KVCKey)
defer { defer {
@@ -128,7 +128,26 @@ public extension NSManagedObject {
self.didChangeValue(forKey: KVCKey) self.didChangeValue(forKey: KVCKey)
} }
self.setPrimitiveValue(value, forKey: KVCKey) self.setPrimitiveValue(value, forKey: KVCKey)
changing(value) }
/**
Provides a convenience wrapper for setting `setPrimitiveValue(...)` with proper calls to `willChangeValueForKey(...)` and `didChangeValueForKey(...)`. This is useful when implementing mutator methods for transient attributes.
- parameter value: the value to set the KVC key with
- parameter KVCKey: the KVC key
- parameter didSetPrimitiveValue: the closure called between `willChangeValueForKey(...)` and `didChangeValueForKey(...)`
*/
@discardableResult
@nonobjc
public func setValue<T>(_ value: Any?, forKVCKey KVCKey: KeyPath, _ didSetPrimitiveValue: (Any?) throws -> T) rethrows -> T {
self.willChangeValue(forKey: KVCKey)
defer {
self.didChangeValue(forKey: KVCKey)
}
self.setPrimitiveValue(value, forKey: KVCKey)
return try didSetPrimitiveValue(value)
} }
/** /**