實例屬性
indices
對集合下標有效的索引,按升序排列。
聲明
var indices: DefaultIndices<Self> { get }
當
Indices
為 DefaultIndices<Self>
時可用。詳述
集合的indices
屬性可以持有對集合本身的強引用,從而導致集合被非唯一引用。如果您在迭代集合的索引時改變集合,強引用可能會導致集合的意外副本。為避免意外複製,請改用以 startIndex
開頭的 index(after:)
方法來生成索引。
var c = MyFancyCollection([10, 20, 30, 40, 50])
var i = c.startIndex
while i != c.endIndex {
c[i] /= 5
i = c.index(after: i)
}
// c == MyFancyCollection([2, 4, 6, 8, 10])
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 String.UTF16View indices。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。