以编程方式更改工具栏上的UILabel（UIBarButtonItem）的文本 [英] Change the text of a UILabel (UIBarButtonItem) on a toolbar programmatically

问题描述

我是初学的iPhone开发者。
我的代码如下：

I'm a beginner iPhone developer. My code is the following:

UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];  
UILabel *lblTotCaratteri = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 25, 15)];
lblTotCaratteri.textAlignment = UITextAlignmentCenter;
lblTotCaratteri.font = [UIFont italicSystemFontOfSize:13.0];
lblTotCaratteri.textColor = [UIColor greenColor];
lblTotCaratteri.backgroundColor = [UIColor clearColor];
lblTotCaratteri.adjustsFontSizeToFitWidth = YES;
lblTotCaratteri.text = @"0";

UIBarButtonItem *lblCaratteri = [[UIBarButtonItem alloc] initWithCustomView: lblTotCaratteri];

inserimentoToolbar.items = [NSArray arrayWithObjects:fixedSpace, lblCaratteri, fixedSpace, nil];

所以在我看来我有一个UITextView，这个工具栏以编程方式创建。
我想在每次向UITextView添加字符时更改标签文本。
每次UITextView文本更改时，我都会显示每个按键的警报。
我无法弄清楚如何更改标签文字。
我希望我已经解释了我的情景。
对不起我的英文。
Greetings，Luca。

So in my view I have a UITextView and this toolbar created programmatically. I want to change the label text each time I add a character to the UITextView. Each time the UITextView text changes, I can display an alert each key pressed. I can't figure out how to change the label text. I hope I've explained my scenario. Sorry for my English. Greetings, Luca.

推荐答案

一种方法是，假设在你的界面中声明了inserimentoToolbar：

One way would be, assuming inserimentoToolbar is declared in your interface:

[(UILabel *)[[toolbar.items objectAtIndex:1] view] setText:@"sometext"];

这真的只有在您的工具栏没有变化时（就对象而言）才有效。

This really only works assuming your toolbar doesn't change (in terms of objects).

或

更理想的解决方案是将lblTotCaratteri放入您的界面（在您的界面中）头文件）。喜欢：

The more ideal solution would be to put lblTotCaratteri in your interface (in your header file). Like:

@interface UntitledViewController : UIViewController {
    UILabel *lblTotCaratteri;
}

然后你所包含的代码就像

Then your included code would just like

UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];  
lblTotCaratteri = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 25, 15)];
lblTotCaratteri.textAlignment = UITextAlignmentCenter;
// etc etc etc

然后在任何时候，只需使用

Then at any point, just use

lblTotCaratteri.text = @"sometext";

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