xcode 更改标签文本

Change Label Text

提问by Qasem

How can I change a label's text? This is what I have tried.

如何更改标签的文本？这是我尝试过的。

labelCheckBox.text = @"This is the new label";

I connected the label in Interface builder for labelCheckBox and created an outlet for it. In the Didload the label's text changed, but in another method inside the class it does not have the new value.

我在接口构建器中为 labelCheckBox 连接了标签并为其创建了一个插座。在 Didload 中，标签的文本已更改，但在类中的另一个方法中，它没有新值。

-(void)settext:(NSString*)newLabelText{

labelCheckBox.text = newLabelText;
 //    labelCheckBox = [[UILabel alloc] init];
//    labelCheckBox.text = @"This is the new label";

} 

I am calling the method in another class as shown here:

我正在另一个类中调用该方法，如下所示：

    [New settext:@"All Transaction"];

The value of 'NewLabelText' after printing it in NSLog is: " All Transaction". But when I assign ' LabelCheckBox.Text = NewLabelText', I print the value of 'LabelCheckBox.Text', and it gives empty.

' NewLabelText' 在 NSLog 中打印后的值是：“ All Transaction”。但是当我分配 ' LabelCheckBox.Text = NewLabelText' 时，我打印了 ' LabelCheckBox.Text'的值，它给出了空值。

回答by RomanHouse

First of all if you use IB you need to create outlet and connection for your UILabel. The easiest way it's dragging from your label (control + drag) to your .h file of controller class. Then synthesize it in .m file and now you can change label text as you do this in question.

首先，如果您使用 IB，您需要为 UILabel 创建插座和连接。最简单的方法是从您的标签（控制 + 拖动）拖动到控制器类的 .h 文件。然后将其合成到 .m 文件中，现在您可以在执行此操作时更改标签文本。

回答by Qasem

the 'View' should load before setting the label text.

“视图”应该在设置标签文本之前加载。

回答by J-Techsha

iOS development sometimes gives you the silence treatment like Javascript to help prevent your app from crashing. With that said, if you have created the UILabelin Interface Builder and have set an IBOutletfor it, make sure you change the text only after the UILabelis created. (i.e. after -viewDidLoad). You can set a break point to where you set the text change and a breakpoint at -viewDidLoadin the UIViewControllerthat contains the UILabelto confirm the order of calls that's taking place.

iOS 开发有时会像 Javascript 一样为您提供静音处理，以帮助防止您的应用程序崩溃。话虽如此，如果您UILabel在 Interface Builder 中创建了并IBOutlet为其设置了，请确保仅在UILabel创建后更改文本。（即之后-viewDidLoad）。您可以在设置文本更改的位置设置断点，-viewDidLoad并在UIViewController包含 的位置设置断点UILabel以确认正在发生的调用顺序。

回答by Ketan Patel

Below code will change text in label with tag value

下面的代码将使用标签值更改标签中的文本

In scrollviewuse this type to change the text in label

在scrollview使用这种类型更改标签中的文本

for(UIView *views in ScrollViewMain.subviews)
{
    UILabel *label = [views viewWithTag:[sender tag]+1000];
    label.text=str1;
}

It will really work. thank you

它真的会起作用。谢谢你