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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第四章
例如，下列程式碼回傳包含名為
SomeImage.png
之資源的絕對路徑之
NSString
︰
NSString* resourcePath = [[NSBundle mainBundle] pathForResource:@"SomeImage"
ofType:@"png"];
// resourcePath 現在是包含指向 SomeImage.png
// 之絕對路徑參考的字串
注意
[NSBundle mainBundle]
呼叫—有可能包含多個軟體包（記住，Cocoa 將套件—亦
即，包含 App 資源的檔案夾—稱作
包
或
軟體包
）。
你也可以取得指向資源的 URL ︰
NSURL* resourceURL = [[NSBundle mainBundle] URLForResource:@"SomeImage"
ofType:@"png"];
這個方法在應用程式包中的
Resources
目錄裡檢視具名檔案（在 iOS 上，它檢視應用程
式包的根目錄）。
參照儲存在磁碟上的檔案時，絕對路徑和 URL 在作用上都一樣，但使用 URL 比較普
遍—理論上，字串可能包含任何內容，而 URL 總是指向某個位置，包括檔案 URL，看
起來就像這樣︰
file:///Applications/Xcode.app/
，因此你可以在任何能夠使用檔案路徑的
地方使用 URL。
如果你把圖像或其他資源增加到專案，當專案被建置時，它們會被複製到應用程式包當
中。對 Mac App 來說，資源會被複製到
Resources
目錄，對 ...
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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.