Which apis below iOS 5.0 has been used?

[Jiangang Zhu]

I want to be use it for 4.x compatible, So I want to make sure which apis below iOS 5.0 has been used?

[songyi]

hi
哥们，我也这么打算了。但最需要注意的是，weak用不了。所以最好要确认是否需要修改。
另外他的backgroundtask 没有安全判断。

[e-mail]

At 2013-08-20 17:23:33,"朱建刚" [e-mail] wrote:

I want to be use it for 4.x compatible, So I want to make sure which apis below iOS 5.0 has been used?

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[Justin Ouellette]

I'm not keeping track of them, use below 5.0 is not recommended