iOS7 self.view填加bug处理

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
    {
        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.extendedLayoutIncludesOpaqueBars = NO;
        self.modalPresentationCapturesStatusBarAppearance = NO;
    }
#endif