设置UIBarButtonItem不更改标题，仅更改样式 [英] Setting UIBarButtonItem not changing title, changing only style

问题描述

我在右上角有一个 UIBarButtonItem ，上面写着编辑".单击时，将调用此代码-我知道是因为按钮被加粗了.但是，按钮的标题不会更改.这是我的代码:

I have a UIBarButtonItem in the top right which says 'Edit'. When clicked, this code is called - I know so because the button is emboldened. However, the button's title does not change. Here is my code:

 // set to not editing and change buttons
        [self setEditing:YES animated:YES];
        UIBarButtonItem *doneButton = (UIBarButtonItem *)sender;
        [doneButton setTitle:@"Done"];
        [doneButton setStyle:UIBarButtonItemStyleDone];
        self.navigationItem.rightBarButtonItem = doneButton;

下面的代码正在执行我想要的操作，但是，当我第一次单击编辑"按钮时，什么也没发生.

The following code is doing what I want, however the first time I click the edit button, nothing happens.

-(void)editButton:(id)sender {
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style: UIBarButtonItemStylePlain target:self action:@selector(edit:)];

}

-(void) edit:(UIBarButtonItem *) barBtnItem
{
    // if not editing
    if (![self isEditing])
    {
        [self setEditing:YES];
        barBtnItem.tag = 1;
        [self.navigationItem.rightBarButtonItem setTitle:@"Done"];
    }
    else
    {
        [self setEditing:NO];
        barBtnItem.tag = 0;
        [self.navigationItem.rightBarButtonItem setTitle:@"Edit"];
    }
}

推荐答案

只需执行

UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style: UIBarButtonItemStyleBordered target:self action:@selector(edit:)];
barButton.tag = 0;
barButton.possibleTitles = [NSSet setWithObjects:@"Edit", @"Done", nil];

只需单击一下即可更改状态.简单的事情.

Just change state according to click. simple thing.

-(void) edit:(UIBarButtonItem *) barBtnItem
{
     if (barBtnItem.tag == 0)
    {
       barBtnItem.tag = 1;
       [self.navigationItem.rightBarButtonItem setTitle:@"Done"];
    }
    else
    {
        barBtnItem.tag = 0;
        [self.navigationItem.rightBarButtonItem setTitle:@"Edit"];
    } 
}

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