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
这段代码也可以工作。把这个放到导航控制器的根控制器上:
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
其他回答
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];
斯威夫特版本:
在你的子ViewController中:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBar.backItem?.title = "TEXT"
}
UIBarButtonItem *btnBack = [[UIBarButtonItem alloc]
initWithTitle:@"Back"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(OnClick_btnBack:)];
self.navigationItem.leftBarButtonItem = btnBack;
[btnBack release];
对于那些使用故事板的人,只需选择父视图(不是持有目标视图的那个)视图控制器框架(确保你在导航栏上单击右键,然后打开属性检查器,在那里你会发现三个表单输入。第三个“后退按钮”是我们正在寻找的。
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。