ios - UISlider 拇指在不接触拇指的情况下移动

Question

我在我的项目中使用 UISlider。通常，只要我们触摸并拖动拇指，拇指就会移动。但是，就我而言，当我触摸到它的边缘但没有触摸它时，拇指移动了。像这样:

这是我的代码:

self.slider = [[UISlider alloc] initWithFrame:CGRectMake(30, [UIScreen mainScreen].bounds.size.height - 200, [UIScreen mainScreen].bounds.size.width-30, 30)];
[self.view addSubview:self.slider];

为什么拇指移动了，如何处理？我的目标是，只有当我触摸并拖动它时，拇指才会移动，而当我触摸它的边缘时，它不会移动。

Answer 1

尝试添加以下代码:

  - (void)viewDidLoad
 {

     UITapGestureRecognizer *tapGest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sliderTapped:)];
     [slider addGestureRecognizer:tapGest];

 }

 - (void)sliderTapped:(UIGestureRecognizer *)tapGest 
 {
        UISlider* slider = (UISlider*)tapGest.view;
        if (slider.highlighted)
            return; // tap on thumb, let slider deal with it
        CGPoint pt = [tapGest locationInView: slider];
        CGFloat percentage = pt.x / slider.bounds.size.width;
        CGFloat delta = percentage * (slider.maximumValue - slider.minimumValue);
        CGFloat value = slider.minimumValue + delta;
        [slider setValue:value animated:YES];

  }