iPhone：编程UISlider以定位点击位置 [英] iPhone:Programming UISlider to position at clicked location

问题描述

如何将滑块设置为单击位置，并在iPhone编程中的UISlider上单击的位置获取滑块值。
我知道我们可以将滑块拖动到那个位置，但我不想这样做。你能告诉我如何将滑块设置为点击位置吗？这可能吗？

How to set the slider to clicked position and get the slider value on the clicked location on UISlider in iPhone programming. i know we can drag the slider to that position but i dont want to do it. Can you please tel me how to set the slider to clicked position? Is this possible to do?

推荐答案

以下是作为用户练习的部分：

Here is the part "left as a user exercise":

- (void) tapped: (UITapGestureRecognizer*) 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];
}

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