Skype for iPhone 来电后台唤醒原理 &2010 Apple iPhone 4.0 OS 发布会

最近使用Skype for iPhone ，对其来电后台唤醒功能感到好奇，网上一查，原来是用了 iOS4的新特性 VoIP，顿然大悟，看来要多看看发布会的内容。



详见 2010 Apple iPhone 4.0 OS 发布会
http://blog.renren.com/share/241456204/1929983856
10:24AM 这就是后台音乐API，下一个是VoIP。



10:25AM "Now
when you're on Skype, you can switch to another app, and you get a double-high status bar. And when you're not running it in the foreground, you can still receive calls."

10:25AM “现在，当你在运行着Skype的时候，你可以切换到另一个程序，同时你可以得到一个两倍高度的状态栏。你即使没有把它运行在前台，你依然可以接听电话。”



10:26AM David
Ponsford from Skype is up. "Thanks everybody. We have half a billion users, and iPhone OS 4 makes it even more convenient to use Skype."

10:26AM David
Ponsford正在通过Skype打电话。“感谢所有人。我们拥有5亿的用户，iPhone OS 4让我们的用户可以更好的体验Skype”

10:26AM "Until
today navigating away from the app meant that I would go offline. Now I go into the background, but I can still receive calls." Call coming through... in a pop up!

10:26AM “直到今天，离开这个程序意味着我将变为离线状态。现在，我进入到了后台，但我依然可以接收电话”来电……通过一个弹出窗！





10:27AM "Hey
Aaron are you there?" "Yeah you want to go to dinner tonight?" "Yeah, let me go into other apps to find a restaurant." And... it's multitasking.

10:27AM “嘿Aaron，听到了吗？”“听到了，今天晚上一起吃饭怎么样？”“好啊，让我用别的程序找个餐馆。”那么……这就是多任务。



10:28AM And
Scott is back.

10:28AM Scott回来了





10:29AM "So
VOIP. The next service is background location. There are two classes of apps that want to use this -- turn by turn, like TomTom. These always want to know where you are so they can provide directions. Now you can get them in the background, you can even listen
to music, and it's still giving you directions."

10:29AM “那么这就是VOIP。