初始化器
init(_:)
創建一個唯一標識給定類實例的實例。
聲明
init(_ x: AnyObject)
參數
x
一個類的實例。
詳述
以下示例創建示例類 IntegerRef
並使用其對象標識符和 identical-to 運算符 (===
) 比較該類的實例:
class IntegerRef {
let value: Int
init(_ value: Int) {
self.value = value
}
}
let x = IntegerRef(10)
let y = x
print(ObjectIdentifier(x) == ObjectIdentifier(y))
// Prints "true"
print(x === y)
// Prints "true"
let z = IntegerRef(10)
print(ObjectIdentifier(x) == ObjectIdentifier(z))
// Prints "false"
print(x === z)
// Prints "false"
可用版本
iOS 8.0+, iPadOS 8.0+, macOS 10.10+, Mac Catalyst 13.0+, tvOS 9.0+, watchOS 2.0+
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注:本文由純淨天空篩選整理自apple.com大神的英文原創作品 ObjectIdentifier init(_:)。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。