ios Presenting view controllers on detached view controllers is discouraged <BasicInfoVC: 0x7fb2d
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出现的原因：
在控制器A中添加控制器B--[A.view addSubView: B.view]
在控制器B中弹出新的控制器时报此waring
解决：
[A addChildViewController:B];
[B.parentViewController presentViewController:alertController animated:YES completion:nil];
详见：http://stackoverflow.com/questions/19890761/warning-presenting-view-controllers-on-detached-view-controllers-is-discourage
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