June 2013
Intermediate to advanced
360 pages
6h 50m
Chinese
Content preview from COCOA學習手冊--使用OBJECTIVE-C第三版
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第十四章
在 OS X 和 iOS 上列印文件的 API 及方法完全不相同。在 OS X 上，個別的
NSView
直
接或透過中間系統被列印。在 iOS 上，則必須透過列印生成器（renderer）及格式化器
（formatter）物件的獨立系統來進行。
我們會建造兩支演示 APP，說明如何在 OS X 和 iOS 上列印文件。
OS X 列印
OS X 開發一個有趣的怪地方就是整個繪圖系統的血源可追溯到 PostScript —一種印表機
語言。在 OS X 上，繪製圖形非常容易被轉譯成印表機命令—事實上，轉譯工作係由 OS
為你完成。
給定任何
NSView
，你可以透過把列印訊息傳送給它而列印之，OS X 從這裡開始接手—
列印面板出現，使用者選擇要使用哪個印表機以及如何列印文件。
當視圖被列印時，它的
drawRect:
方法被呼叫—然而，在該方法被呼叫之前所準備的繪
圖環境（graphics context）是設計來產生印表機命令的（特別是 EPS 或 PDF 內容）。這
表示，你所產生的任何自訂
NSView
子類別都已經建立好要進行列印工作。
為了說明列印，我們會建造一支列印
NSTextView
的小範例應用程式。
1.
建立專案
。建立名為
OSXPrinting
的新 Cocoa 應用程式。
2.
建立介面
。打開
MainWindow.xib
。
a. 把
NSTextView
拖進 App 的主要視窗，讓它填滿視窗，但在底端留點空間。
b. 拖進
NSButton
，並將它安置在視窗右下方。把它的標籤改變成 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.