From 80e357c01c5d41b8c9af40272e5a312493f1cdc3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BB=8E=E4=BB=8A=E4=BB=A5=E5=90=8E?= <949478479@qq.com>
Date: Fri, 17 Feb 2017 10:11:17 +0800
Subject: [PATCH] Update 22_Protocols.md (#685)
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改正示例代码中的两处错误
---
 source/chapter2/22_Protocols.md | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/source/chapter2/22_Protocols.md b/source/chapter2/22_Protocols.md
index 519c24ca..8498c30b 100644
--- a/source/chapter2/22_Protocols.md
+++ b/source/chapter2/22_Protocols.md
@@ -737,8 +737,8 @@ for object in objects {
 
 ```swift
 @objc protocol CounterDataSource {
-    optional func incrementForCount(count: Int) -> Int
-    optional var fixedIncrement: Int { get }
+    @objc optional func incrementForCount(count: Int) -> Int
+    @objc optional var fixedIncrement: Int { get }
 }
 ```
 
@@ -886,11 +886,11 @@ extension PrettyTextRepresentable  {
 例如，你可以扩展 `CollectionType` 协议，但是只适用于集合中的元素遵循了 `TextRepresentable` 协议的情况：
 
 ```swift
-extension CollectionType where Generator.Element: TextRepresentable {
-    var textualDescription: String {
-        let itemsAsText = self.map { $0.textualDescription }
-        return "[" + itemsAsText.joinWithSeparator(", ") + "]"
-    }
+extension Collection where Iterator.Element: TextRepresentable {
+	var textualDescription: String {
+		let itemsAsText = self.map { $0.textualDescription }
+		return "[" + itemsAsText.joined(separator: ", ") + "]"
+	}
 }
 ```