From 706f040fd6facc85e9be476f19c72685afc36d6d Mon Sep 17 00:00:00 2001
From: Shiny Zhu <shinyzhu@Shinys-MacBook-Pro.local>
Date: Sun, 8 Jun 2014 09:08:33 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E2=80=9C=E4=BE=BF=E6=8D=B7Se?=
 =?UTF-8?q?tter=E5=A3=B0=E6=98=8E=E2=80=9D=E4=B8=80=E8=8A=82=E5=86=85?=
 =?UTF-8?q?=E5=AE=B9?=
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---
 source/chapter2/10_Properties.md | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md
index 6b3f00e4..d46dd56f 100644
--- a/source/chapter2/10_Properties.md
+++ b/source/chapter2/10_Properties.md
@@ -155,5 +155,25 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))")
 <img src="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/computedProperties_2x.png" alt="Computed Properties sample" width="388" height="387" />
 
 
-### Setter的便捷方式
+### 便捷Setter声明
 
+如果计算属性的setter没有定义表示新值的参数名，则可以使用默认名称`newValue`。下面是使用了便捷Setter声明的`Rect`结构体代码：
+
+```
+struct AlternativeRect {
+    var origin = Point()
+    var size = Size()
+    var center: Point {
+    get {
+        let centerX = origin.x + (size.width / 2)
+        let centerY = origin.y + (size.height / 2)
+        return Point(x: centerX, y: centerY)
+    }
+    set {
+        origin.x = newValue.x - (size.width / 2)
+        origin.y = newValue.y - (size.height / 2)
+    }
+    }
+}
+
+```
\ No newline at end of file