From ca027e913214b152f026123ec108dbdd7fad916b Mon Sep 17 00:00:00 2001 From: Nemocdz Date: Sun, 29 Sep 2019 23:40:39 +0800 Subject: [PATCH] update swift 5.1 --- source/chapter2/23_Automatic_Reference_Counting.md | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/source/chapter2/23_Automatic_Reference_Counting.md b/source/chapter2/23_Automatic_Reference_Counting.md index 4200122d..e8b80cca 100755 --- a/source/chapter2/23_Automatic_Reference_Counting.md +++ b/source/chapter2/23_Automatic_Reference_Counting.md @@ -477,13 +477,14 @@ paragraph = nil ### 定义捕获列表 {#defining-a-capture-list} -捕获列表中的每一项都由一对元素组成，一个元素是 `weak` 或 `unowned` 关键字，另一个元素是类实例的引用（例如 `self`）或初始化过的变量（如 `delegate = self.delegate!`）。这些项在方括号中用逗号分开。 +捕获列表中的每一项都由一对元素组成，一个元素是 `weak` 或 `unowned` 关键字，另一个元素是类实例的引用（例如 `self`）或初始化过的变量（如 `delegate = self.delegate`）。这些项在方括号中用逗号分开。 如果闭包有参数列表和返回类型，把捕获列表放在它们前面： ```swift -lazy var someClosure: (Int, String) -> String = { - [unowned self, weak delegate = self.delegate!] (index: Int, stringToProcess: String) -> String in +lazy var someClosure = { + [unowned self, weak delegate = self.delegate] + (index: Int, stringToProcess: String) -> String in // 这里是闭包的函数体 } ``` @@ -491,8 +492,8 @@ lazy var someClosure: (Int, String) -> String = { 如果闭包没有指明参数列表或者返回类型，它们会通过上下文推断，那么可以把捕获列表和关键字 `in` 放在闭包最开始的地方： ```swift -lazy var someClosure: () -> String = { - [unowned self, weak delegate = self.delegate!] in +lazy var someClosure = { + [unowned self, weak delegate = self.delegate] in // 这里是闭包的函数体 } ```