为uiSegmentedControl定义单击事件

如果我正确理解您的问题,您只需实现一个目标操作方法(由 UIControl 哪个是 UISegmentedControl 的父类)。 UIControlEventValueChanged 与uiSegmentControl中给出的示例完全相同 reference documentation .

即

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

用于具有以下签名的邮件:

- (void)action:(id)sender

或

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

对于

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

或

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

对于最简单的方法:

- (void)action

这是uikit中使用的标准类型的目标动作选择器。

试试这个:

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

      if (selectedSegment == 0) {

      }
      else{

      }
    }

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];

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
    }

我希望它能帮助你

值得注意的是,选择器必须精确匹配一个方法,但没有实际的参数。

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

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

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

这让我困惑了很长一段时间,从先前的回答中也不太清楚。

如需快速使用:

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

并实现这样的方法:

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

如果要在选择所选段时调用特定操作,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
    }      
}

在SegmentSelected中调用“ValueChanged”,如下所示:

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

更新了Swift中的简单版本

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

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

    // Do what you want
}

简单地说,您需要使用故事板对视图控制器进行操作,以便使此操作生效。

- (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;
    }
}

可以将ib中的处理程序附加到值更改事件:uicontrolEventValueChanged

或者你可以用代码来做:

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