当UISlider值改变时会调用什么？

3 回答

• 5

  在IB中，您可以将 IBAction 连接到 Value Changed event 或在 UIControlEventValueChanged 的代码添加目标/操作中 . 例如：

  [mySlider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];
  
  - (IBAction)sliderValueChanged:(UISlider *)sender {
      NSLog(@"slider value = %f", sender.value);
  }
  

  请注意，如果您希望值更改事件为用户为 sliding ，则请确保 slider 的 continuous property 也已设置 . 另一方面，如果您不希望事件以用户是 sliding 并且仅在完成滑动时触发，则将连续设置为NO（或在IB中取消选中） .

  回复于 2024-04-30T12:24:23+08:00
• 0

  对于Swift 3

  //There is your slider
  @IBOutlet weak var mSlider: UISlider!
  
  //add a target on your slider on your viewDidLoad for example
  self.mSlider.addTarget(self, action: #selector(MyClass.onLuminosityChange), for: UIControlEvents.valueChanged)
  
  //callback called when value change
  func onLuminosityChange(){
      let value = self.mSlider.value
  }
  

  回复于 2024-04-30T12:24:23+08:00
• 165

  ViewController.h
  
  @property (strong, nonatomic) IBOutlet UIProgressView *prgs;
  
  - (IBAction)slider:(id)sender;
  
  @property (strong, nonatomic) IBOutlet UISlider *slider1;
  
  @property (strong, nonatomic) IBOutlet UILabel *lbl;
  
  
  ViewController.m
  
  - (IBAction)slider:(id)sender 
  {
  
      self.prgs.progress=self.slider1.value;
  
      self.lbl.text = [NSString stringWithFormat:@"%f", 
  self.slider1.value];
  
  }
  

  回复于 2024-04-30T12:24:23+08:00