问题描述
知道iOS4支持wifi在睡着时保持活着真的很开心。但是我得到了一些不同的体验：
我有2台iPod，iPod第二代和iPod第三代。两者都更新到iOS 4测试版。 iPod 2g可以在睡眠中保持wifi状态，而iPod 3g在睡眠时总是会断开wifi。我在他们处于睡眠模式时对他们两个进行ping操作，只有iPod 2g保持回复回音。
Knowing that iOS4 support wifi stay alive in asleep is really happy thing. However I got some different experience:I've got 2 iPods, iPod 2nd gen & iPod 3rd gen. Both updated to iOS 4 beta. iPod 2g can stay wifi on in sleep while iPod 3g always disconnect wifi in sleep. I ping both of them while they're in sleep mode, only iPod 2g keeps reply echo.
可能经常提示我表明我做错了吗？
Could any often a hint to show the point I'm doing wrong?
推荐答案
在你的plist上添加这个测试：
Test with adding this on your plist :
UIRequiresPersistentWiFi = YES
有了这个，wifi在所有生命中都是活着的你的应用。
With this the wifi is alive during all the life of your app.
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