当前左边栏按钮的默认值是加载当前视图的视图的标题,换句话说,当按下按钮(后退按钮)时显示的视图。
我想把按钮上显示的文本更改为其他内容。
我试着把下面这行代码放在视图控制器的viewDidLoad方法中,但它似乎不起作用。
self.navigationItem.leftBarButtonItem.title = @"Log Out";
我该怎么办?
谢谢。
当前左边栏按钮的默认值是加载当前视图的视图的标题,换句话说,当按下按钮(后退按钮)时显示的视图。
我想把按钮上显示的文本更改为其他内容。
我试着把下面这行代码放在视图控制器的viewDidLoad方法中,但它似乎不起作用。
self.navigationItem.leftBarButtonItem.title = @"Log Out";
我该怎么办?
谢谢。
当前回答
Most of solutions kills the original style of BackButton (The left arrowed bar button) while adding a usual button with desired title. So to keep the original style there are 2 ways: 1st: To use undocumented button style (110 or something like that) which I prefer not to do. But if you want you could find how to do it here, on stackoverflow. 2nd: To use I the Trenskow's idea. I liked it and I use it a bit changed. Instead of overriding - (NSString*)title I've decided to keep the original title in the following way (which allows me to use nib's titles as well as given title at push state btw).
- (void)viewDidLoad {
[super viewDidLoad];
static NSString * backButtonTitle=@"Back"; //or whatever u want
if (![self.title isEqualToString:backButtonTitle]){
UILabel* customTitleView = [[UILabel alloc] initWithFrame:CGRectZero];
customTitleView.text = self.title; // original title
customTitleView.font = [UIFont boldSystemFontOfSize:20];
customTitleView.backgroundColor = [UIColor clearColor];
customTitleView.textColor = [UIColor whiteColor];
customTitleView.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
customTitleView.shadowOffset = CGSizeMake(0, -1);
[customTitleView sizeToFit];
self.navigationItem.titleView = [customTitleView autorelease];
self.title = backButtonTitle;
}
}
这个解决方案效果很好,看起来很自然。此外,如果在viewDidLoad方法中使用它,它可以防止执行超过1次。 我也试过杰塞德克的解决方案,但看起来很糟糕。它导致可见的用户标题栏的变化,从原来的BackButton的期望和回来。
其他回答
Most of solutions kills the original style of BackButton (The left arrowed bar button) while adding a usual button with desired title. So to keep the original style there are 2 ways: 1st: To use undocumented button style (110 or something like that) which I prefer not to do. But if you want you could find how to do it here, on stackoverflow. 2nd: To use I the Trenskow's idea. I liked it and I use it a bit changed. Instead of overriding - (NSString*)title I've decided to keep the original title in the following way (which allows me to use nib's titles as well as given title at push state btw).
- (void)viewDidLoad {
[super viewDidLoad];
static NSString * backButtonTitle=@"Back"; //or whatever u want
if (![self.title isEqualToString:backButtonTitle]){
UILabel* customTitleView = [[UILabel alloc] initWithFrame:CGRectZero];
customTitleView.text = self.title; // original title
customTitleView.font = [UIFont boldSystemFontOfSize:20];
customTitleView.backgroundColor = [UIColor clearColor];
customTitleView.textColor = [UIColor whiteColor];
customTitleView.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
customTitleView.shadowOffset = CGSizeMake(0, -1);
[customTitleView sizeToFit];
self.navigationItem.titleView = [customTitleView autorelease];
self.title = backButtonTitle;
}
}
这个解决方案效果很好,看起来很自然。此外,如果在viewDidLoad方法中使用它,它可以防止执行超过1次。 我也试过杰塞德克的解决方案,但看起来很糟糕。它导致可见的用户标题栏的变化,从原来的BackButton的期望和回来。
这在Swift 4和iOS 11中都适用。最常见的情况是,当用户点击表视图中的一行,一个新的视图控制器被推送到导航堆栈时,我需要这样做。通常我希望返回按钮是被点击的行所表示的对象的名称或某些属性。我通常在didSelectRowAt中这样做。是这样的:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let object = // get the object this row represents
let backButton = UIBarButtonItem()
backButton.title = object.name // or whatever
self.navigationItem.backBarButtonItem = backButton
// now show or segue to the next view controller
}
这应该放在调用名为NewTitle的ViewController的方法中。 就在push或popViewController语句之前。
UIBarButtonItem *newBackButton =
[[UIBarButtonItem alloc] initWithTitle:@"NewTitle"
style:UIBarButtonItemStyleBordered
target:nil
action:nil];
[[self navigationItem] setBackBarButtonItem:newBackButton];
[newBackButton release];
斯威夫特4 iOS 11.2 Xcode 9.2
TableViewController1 ---segue---> TableViewController2
你可以在TableViewController1或TableViewController2中更改返回按钮的文本。
更改TableViewController1内部的返回按钮文本:
1)在viewWillAppear():
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let myBackButton = UIBarButtonItem()
myBackButton.title = "Custom text"
navigationItem.backBarButtonItem = myBackButton
}
由于某种原因,viewDidLoad()还太早,不能将后退按钮添加到NavigationItem中。要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1中的TableViewCell拖到TableViewController2的中间,然后在弹出菜单中选择Selection Segue > Show。
2)在tableView(_:didSelectRowAt:):
override func tableView(_ tableView: UITableView, didSelectRowAt: IndexPath) {
let myButton = UIBarButtonItem()
myButton.title = "Custom text"
navigationItem.backBarButtonItem = myButton
performSegue(withIdentifier: "ShowMyCustomBackButton", sender: nil)
}
要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1上面的黄色小圆圈拖到TableViewController2中间,然后从弹出菜单中选择Manual Segue > Show。然后选择连接两个TableViewControllers的segue,在属性检查器中“Identifier”旁边输入“ShowMyCustomBackButton”。
3)在故事板中:
如果你只是需要静态的自定义文本返回按钮,为TableViewController1选择NavigationItem(它在故事板的目录表中有一个<图标),然后打开属性检查器,在“back button”字段中输入你的自定义文本(确保从该字段中tab出来,更改生效)。
更改TableViewController2内部的返回按钮文本:
1)在viewWillAppear():
class MySecondTableViewController: UITableViewController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let myBackButton = UIBarButtonItem(
title: "<Custom text",
style: .plain,
target: self,
action: #selector(goBack) //selector() needs to be paired with an @objc label on the method
)
navigationItem.leftBarButtonItem = myBackButton
}
@objc func goBack() {
navigationController?.popViewController(animated: true)
}
要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1中的TableViewCell拖到TableViewController2的中间,然后在弹出菜单中选择Selection Segue > Show。
iOS 11+解决方案-不需要再次创建后退按钮。
将backButtonTitle设置为前一屏幕上的一个空格。
// If navigation is from A -> B, set in A's `viewDidLoad`.
navigationItem.backButtonTitle = " "