iphone - 在特定点点击时更改 Uislider 值

Question

我想通过点击而不是拖动滑块拇指在 UISlider 上的特定点点击时触发一个动作。

如何在某个点点击 UISlider 来设置滑块值？

一段代码将不胜感激。

Answer 1

    UISlider *slider = [[[UISlider alloc] init] autorelease];
…

滑块设置

…
UITapGestureRecognizer *gr = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sliderTapped:)] autorelease];
[slider addGestureRecognizer:gr];
- (void)sliderTapped:(UIGestureRecognizer *)g {
     UISlider* s = (UISlider*)g.view;
    if (s.highlighted)
        return; // tap on thumb, let slider deal with it
    CGPoint pt = [g locationInView: s];
    CGFloat percentage = pt.x / s.bounds.size.width;
    CGFloat delta = percentage * (s.maximumValue - s.minimumValue);
    CGFloat value = s.minimumValue + delta;
    [s setValue:value animated:YES];
}

Answer 2

如果 v1 是一个 uiview，在那个地方 uislider\ 后面有纯背景，请尝试 uiview touchesbegan 函数

  - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  UITouch *touch = [touches anyObject];
  if ([touch view] == v1)
  {
    CGPoint location = [touch locationInView:v1];
    NSInteger i = location.x;
  }

然后通过乘以 v1 帧获得 xpoint 的百分比，即如果 v1 帧 x 值 =50 且 i = 5 表示 10%，然后将百分比值乘以滑块值以更改滑块值