未能以编程方式使 UINavigationController 的导航栏显示在底部[重复]

Question

我正在尝试使 UINavigationController 的导航栏显示在底部。

Put this in the viewWillApprear, it can work. But it go back to the top when come back via dismiss modal view from other views. Even this will be called again, it just stay on the top. So odd !

CGRect navBarOldCGRect = self.navigationController.navigationBar.frame;

CGRect navBarNewCGRect = navBarOldCGRect;
navBarNewCGRect.origin.x = 0;
navBarNewCGRect.origin.y = viewFrame.size.height - navBarOldCGRect.size.height -navBarOldCGRect.origin.y;
navBarNewCGRect.size.width = navBarOldCGRect.size.width;
navBarNewCGRect.size.height = navBarOldCGRect.size.height;

self.navigationController.navigationBar.frame = navBarNewCGRect;


NSLog(@"viewFrame : %@", CGRectCreateDictionaryRepresentation(viewFrame));
NSLog(@"navBarOldCGRect : %@", CGRectCreateDictionaryRepresentation(navBarOldCGRect));
NSLog(@"navBarNewCGRect : %@", CGRectCreateDictionaryRepresentation(navBarNewCGRect));
NSLog(@"result : %@", CGRectCreateDictionaryRepresentation(self.navigationController.navigationBar.frame));

这样的日志输出；

viewFrame : {
    Height = 1024;
    Width = 768;
    X = 0;
    Y = 0;
}
navBarOldCGRect : {
    Height = 44;
    Width = 768;
    X = 0;
    Y = 20;
}
navBarNewCGRect : {
    Height = 44;
    Width = 768;
    X = 0;
    Y = 960;
}
result : {
    Height = 44;
    Width = 768;
    X = 0;
    Y = 960;
}

但不会在屏幕上改变。导航栏仍位于屏幕顶部。

我错过了什么？

Answer 1

这足以创建导航栏。放在 viewDidLoad 或 viewWillAppear [self.navigationController.navigationBar setHidden:NO];

//新答案

-(void) tabBarFunction
{
homeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
recentSearchBtn = [UIButton buttonWithType:UIButtonTypeCustom];
myFavBtn = [UIButton buttonWithType:UIButtonTypeCustom];
myOrderBtn = [UIButton buttonWithType:UIButtonTypeCustom];


    bgImageView.frame = CGRectMake(0, 0,320, 480);
    [bgImageView setImage:[UIImage imageNamed:@"bg.png"]];
    [homeBtn setFrame:CGRectMake(0, 388, 80, 48)];
    [recentSearchBtn setFrame:CGRectMake(80, 388, 80, 48)];
    [myFavBtn setFrame:CGRectMake(160, 388, 80, 48)];
    [myOrderBtn setFrame:CGRectMake(240, 388, 80, 48)];




[homeBtn setImage:[UIImage imageNamed:@"home_sel_btn.png"] forState:UIControlStateNormal];
[recentSearchBtn setImage:[UIImage imageNamed:@"search_unsel_btn.png"] forState:UIControlStateNormal];
[myFavBtn setImage:[UIImage imageNamed:@"fav_unsel_btn.png"] forState:UIControlStateNormal];
[myOrderBtn setImage:[UIImage imageNamed:@"order_unsel_btn.png"] forState:UIControlStateNormal];

[homeBtn addTarget:self action:@selector(homeBtnTapped) forControlEvents:UIControlEventTouchUpInside];
[recentSearchBtn addTarget:self action:@selector(recentSearchTapped) forControlEvents:UIControlEventTouchUpInside];
[myFavBtn addTarget:self action:@selector(myFaveBtnTapped) forControlEvents:UIControlEventTouchUpInside];
[myOrderBtn addTarget:self action:@selector(myOrderBtnTapped) forControlEvents:UIControlEventTouchUpInside];


[self.view addSubview:homeBtn];
[self.view addSubview:recentSearchBtn];
[self.view addSubview:myFavBtn];
[self.view addSubview:myOrderBtn];

}

Answer 2

试试这个

bottomNav = [[UINavigationBar alloc] initWithFrame:CGRectMake(0.0,  self.view.frame.size.height - 20, self.view.frame.size.width, 44.0)];  
bottomNav.barStyle = UIBarStyleBlackOpaque;  
[self.parentViewController.view addSubview:bottomNav]; 

你可以试试这样

    NSArray *items = [NSArray arrayWithObjects:
                      ..
                      nil];

    self.navigationController.toolbar.barStyle = self.navigationController.navigationBar.barStyle;
    self.navigationController.toolbar.tintColor = self.navigationController.navigationBar.tintColor;
    self.toolbarItems = items;