导航烂位置下调64

// if ([[[UIDevice currentDevice] systemVersion]doubleValue]>7.0) {
// self.edgesForExtendedLayout=UIRectEdgeNone;
// }

2.在当前控制器建立导航烂

UINavigationController *nav =[[UINavigationController alloc] initWithRootViewController:self];

[UIApplication sharedApplication].keyWindow.rootViewController = nav;