實例方法
load(from
load(fromByteOffset:as:)
返回給定類型的新實例,從緩衝區指針的原始內存中以指定的字節偏移量讀取。
聲明
func load<T>(
fromByteOffset offset: Int = 0,
as type: T.Type
) -> T
返回值
T
類型的新實例,從緩衝區指針的內存中複製。
參數
offset
開始讀取新實例數據的緩衝區指針內存的偏移量(以字節為單位)。緩衝區指針加上
offset
必須正確對齊才能訪問類型為T
的實例。默認為零。type
用於新構造實例的類型。內存必須初始化為與
type
布局兼容的類型的值。
詳述
您可以使用此方法從緩衝區指針的底層字節創建新值。以下示例從緩衝區指針 someBytes
引用的內存中創建兩個新的 Int32
實例。 a
的字節是從 someBytes
的前四個字節複製的,而 b
的字節是從接下來的四個字節複製的。
let a = someBytes.load(as: Int32.self)
let b = someBytes.load(fromByteOffset: 4, as: Int32.self)
為新實例讀取的內存不得超出緩衝區指針的內存區域,即 offset + MemoryLayout<T>.size
必須小於或等於緩衝區指針的 count
。
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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