导航栏是否隐藏影响view的布局

我在ios7下运行代码：

• 有导航栏时，布局为CGRectMake(0, 0, 40, 40)，view从导航栏下开始；
• 如果 self.navigationController.navigationBar.hidden = YES 处理后，布局为CGRectMake(0, 0, 40, 40)view会从屏幕的顶端开始，被状态栏挡住一部分；
• 不然空出导航栏的位置CGRectMake(0, 20, 40, 40)，view会从状态栏下面在下移20开始。

这个不知道怎么解决，请高手指点~~万分感谢。

我的导航栏和标签栏是通过下面代码处理的，不知道有没有影响：

OYIFirstViewController * vc1 = [[OYIFirstViewController alloc] init];

OYIOrderViewController * vc2 = [[OYIOrderViewController alloc] init];

OYISecondViewController * vc3 = [[OYISecondViewController alloc] init];

//每一个tabBarItem添加一个navigation
    UINavigationController *navController1 =
    [[UINavigationController alloc] initWithNavigationBarClass:[testNavigationBar class]
                                                  toolbarClass:nil];
    [navController1 setViewControllers:[NSArray arrayWithObject:vc1]];

    UINavigationController *navController2 =
    [[UINavigationController alloc] initWithNavigationBarClass:[testNavigationBar class]
                                                  toolbarClass:nil];
    [navController2 setViewControllers:[NSArray arrayWithObject:vc2]];

    UINavigationController *navController3 =
    [[UINavigationController alloc] initWithNavigationBarClass:[testNavigationBar class]
                                                  toolbarClass:nil];
    [navController3 setViewControllers:[NSArray arrayWithObject:vc3]];

    navController1.navigationBar.translucent = NO;
    navController2.navigationBar.translucent = NO;
    navController3.navigationBar.translucent = NO;


navController1.navigationBar.tintColor = [UIColor whiteColor];
navController2.navigationBar.tintColor = [UIColor whiteColor];
    navController3.navigationBar.tintColor = [UIColor whiteColor];

//tabBar设置标签名
UITabBarItem *customItem1 = [[UITabBarItem alloc] initWithTitle:@"首页" image:[UIImage imageNamed:@"HOME"] tag:0];

navController1.tabBarItem = customItem1;

UITabBarItem *customItem2 = [[UITabBarItem alloc] initWithTitle:@"发现" image:[UIImage imageNamed:@"FOUND"] tag:1];

navController2.tabBarItem = customItem2;

UITabBarItem *customItem3 = [[UITabBarItem alloc] initWithTitle:@"快速发布" image:[UIImage imageNamed:@"PUBLISH"] tag:2];

navController3.tabBarItem = customItem3;

//将navigation添加到tabBar中
NSArray* controllers = [NSArray arrayWithObjects:navController1, navController2, navController3, nil];

    self.wTabBarControler.viewControllers = controllers;
self.wTabBarControler.edgesForExtendedLayout = UIRectEdgeNone;
self.wTabBarControler.tabBar.tintColor = [UIColor colorWithRed:231.0/255 green:94.0/255 blue:25.0/255 alpha:1.0f];
    [self.wTabBarControler.tabBar setBackgroundImage:[UIImage imageNamed:@"tabbar_normal_background.png"]];

[self.window addSubview:self.wTabBarControler.view];

self.window.rootViewController = self.wTabBarControler;

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oc中有些0值是会给默认值的，试试不用0，用CGFloatMin，也就是最小的浮点数。

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本来就是这样的，有navigationBar时和没有navigationBar时坐标起始点不同。