January 2017
Intermediate to advanced
552 pages
9h 43m
Chinese
Content preview from iOS 编程基础：Swift、Xcode 和Cocoa 入门指南
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58
｜
第
2
章
首先，匿名函数是降低代码的命令性，增强函数性的一种行之有效的方式：动作在需要
时才发生，而无须借助一系列的准备步骤。如下是个常见的
Cocoa
示例：创建并配置
一个
NSMutableParagraphStyle
，然后在对
addAttribute:value:range:
的调用中使用
（
content
是个
NSMutableAttributedString
）。
let para = NSMutableParagraphStyle()
para.headIndent = 10
para.firstLineHeadIndent = 10
// ... more configuration of para ...
content.addAttribute(
NSParagraphStyleAttributeName,
value:para, range:NSMakeRange(0,1))
我觉得上面的代码丑陋至极。我们只在
addAttribute:value:range
调用中才需要将
para
作为
value:
实
参传递进去，因此在调用中创建并配置它才是更好的做法。
Swift
允
许我们这么做，我更倾向于下面这种写法：
content.addAttribute(
NSParagraphStyleAttributeName,
value: {
let para = NSMutableParagraphStyle()
para.headIndent = 10
para.firstLineHeadIndent ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.