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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第八章
圖 8-2 播放視頻
使用
AVAudioPlayer
播放音頻
AVPlayer
被設計來播放任何類型的音頻或視頻，此外，AV Foundation 也提供專門用來
播放音頻的類別，叫作
AVAudioPlayer
。
對播放音頻來說，
AVAudioPlayer
是比
AVPlayer
更單純的選擇。對於只播放音效及
音樂，而不使用視頻的 App 來說，這個類別是非常好用的，並且具有下列幾個超越
AVPlayer
的優勢︰
•
AVAudioPlayer
讓你根據每一個播放器設定音量（
AVPlayer
使用系統音量）。
•
AVAudioPlayer
比較容易循環播放。
• 你可以向
AVAudioPlayer
詢問它的當前輸出功率，你可以用它來顯示不同時間下的
音量變化。
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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.