ios 为 UISegmentedControl 定义点击事件

Define click event for UISegmentedControl

提问by Warrior

I have added a UISegmentedControlin my application. None of the buttons are selected in normal state. I want to implement a button click event when the first segment is selected, and another event when another button is clicked.

我UISegmentedControl在我的应用程序中添加了一个。在正常状态下没有选择任何按钮。我想在选择第一个片段时实现一个按钮单击事件，并在单击另一个按钮时实现另一个事件。

回答by macbirdie

If I understand your question correctly, you simply have to implement a target-action method (supported by UIControlwhich is UISegmentedControl's parent class) for the constant UIControlEventValueChanged, exactly like in the example given in UISegmentControl's reference documentation.

如果我没有理解你的问题，你只需要实现一个目标-动作方法（支持UIControl它UISegmentedControl的父类）为恒UIControlEventValueChanged，酷似UISegmentControl在给出的例子参考文档。

i.e.

IE

[segmentedControl addTarget:self
                     action:@selector(action:)
           forControlEvents:UIControlEventValueChanged];

used for a message with the following signature:

用于具有以下签名的消息：

- (void)action:(id)sender

or

或者

[segmentedControl addTarget:self
                     action:@selector(action:forEvent:)
           forControlEvents:UIControlEventValueChanged];

for

为了

- (void)action:(id)sender forEvent:(UIEvent *)event

or

或者

[segmentedControl addTarget:self
                     action:@selector(action)
           forControlEvents:UIControlEventValueChanged];

for the simplest method:

对于最简单的方法：

- (void)action

which are standard types of target-action selectors used in UIKit.

这是 UIKit 中使用的标准类型的目标操作选择器。

回答by Nuno Ferro

try this:

尝试这个：

- (IBAction)segmentSwitch:(UISegmentedControl *)sender {
      NSInteger selectedSegment = sender.selectedSegmentIndex;

      if (selectedSegment == 0) {

      }
      else{

      }
    }

回答by Sivanathan

Try this one,

试试这个，

    UISegmentedControl  * travelModeSegment = [[UISegmentedControl alloc] initWithItems:
    [NSArray arrayWithObjects:NSLocalizedString(@"Driving", nil),                 NSLocalizedString(@"Walking", nil), nil]];
    [travelModeSegment setFrame:CGRectMake(9.0f, 0.0f, 302.0f, 45.0f)];
    [cell addSubview:travelModeSegment];
    [travelModeSegment release];

then write an action,

然后写一个动作，

     if (travelModeSegment.selectedSegmentIndex == 0) {
        //write here your action when first item selected
    } else {
        //write here your action when second item selected
    }

I hope it will help you

我希望它会帮助你

回答by Beninho85

Simple version in swift updated

快速更新的简单版本

func loadControl(){
     self.yourSegmentedControl.addTarget(self, action: #selector(segmentSelected(sender:)), forControlEvents: .valueChanged)
}

func segmentSelected(sender: UISegmentedControl)
{
    let index = sender.selectedSegmentIndex

    // Do what you want
}

回答by Jonathan

It's worth noting that the selector has to match a method exactly, but without the actual parameters.

值得注意的是，选择器必须与方法完全匹配，但没有实际参数。

@selector(action)
    => -(void) action { ..code.. }

@selector(action:) 
    => -(void) action:(id)sender { ..code.. }

@selector(action:forEvent:) 
    => -(void) action:(id)sender forEvent:(UIEvent *)event { ..code.. }

This confused me for the longest time, and it's not quite clear from the earlier answers.

这让我困惑了最长的时间，而且从早期的答案中还不清楚。

回答by datayeah

for SWIFT use this:

对于 SWIFT 使用这个：

segmentedControl.addTarget( self, action: "segmentSelected:", forControlEvents: UIControlEvents.ValueChanged )

and implement a method like this:

并实现这样的方法：

func segmentSelected(sender: UISegmentedControl)
{
    println("selected index: \(sender.selectedSegmentIndex)")
}

Extend UISegmentedControl if you want to call a specific action when the selected segment is selected:

如果您想在选定片段被选中时调用特定操作，请扩展 UISegmentedControl：

class CustomSegmentedControl : UISegmentedControl
{        
    override init()
    {
        super.init()
    }

    override init(frame:CGRect)
    {
        super.init(frame:frame)
    }

    required init(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
    }

    func valueChanged(index:Int)
    {
         // ACTION GOES HERE
    }      
}

and call your "valueChanged" in "segmentSelected" like this:

并在“segmentSelected”中调用您的“valueChanged”，如下所示：

func segmentSelected(sender: CustomSegmentedControl)
{
    println("selected index: \(sender.selectedSegmentIndex)")
    sender.valueChanged(sender.selectedSegmentIndex)
}

回答by rafaeljuzo

Simple like that, you need to make the action using the storyboard to the view controller in order to make this action to work.

就这么简单，您需要使用情节提要对视图控制器进行操作，以使此操作起作用。

- (IBAction)searchSegmentedControl:(UISegmentedControl *)sender
{
    switch (sender.selectedSegmentIndex) {
        case 0:
            NSLog(@"First was selected");
            break;
        case 1:
            NSLog(@"Second was selected");
            break;
        case 2:
            NSLog(@"Third was selected");
            break;
        default:
            break;
    }
}

回答by progrmr

You can attach a handler in IB to the value changed event: UIControlEventValueChanged

您可以将 IB 中的处理程序附加到值更改事件： UIControlEventValueChanged

or you can do it in code:

或者你可以在代码中做到这一点：

[segmentedControl addTarget:self
                     action:@selector(action:)
           forControlEvents:UIControlEventValueChanged];