如何创建一个透明的中间栏和自定义旋钮大小的自定义NSSlider

问题描述

我在 NSSliderCell 上搜索了一些代码，但我找不到一种方法来做我正在寻找的内容。

我想创建这样的东西（白线是滑块旋钮，1像素宽）：

I've searched around for some code on NSSliderCell but I can't find a way to do what I'm looking for.
I'd like to create something like this (where the white line is the slider knob, 1 pixel width):

我将使用这个作为音乐曲目的时间条，所以它将每秒这就是为什么我想使用 NSSlider 来简化操作）。

我需要做什么来做一个滑块，有一个透明的中间栏，类似于上面的图像？




PS：它不会是可触摸的，它只是为了显示。

I'm going to use this for the time bar of a music track, so it's going to move every second (that's why I want to use a NSSlider to make things easy).
What do I need to do to make a slider, with a transparent middle bar, similar to the image above?

PS: It's not going to be touchable, it's just for display.

推荐答案

我终于得到了：

• 我创建了一个 NSSliderCell 子类的属性 @property float x ;


• 我覆盖了 drawKnob 方法和里面我写的：

• I created a NSSliderCell subclass with a property @property float x;
• I overrode the drawKnob method and inside it I wrote:

• 我将一个 NSSlider 窗口（使它变小，将宽度改为窗口的宽度），并将其单元格类更改为我创建的单元格类;


• 然后当音乐播放时，每次一秒钟我这样做：


• I dragged a NSSlider into my window (made it small, changed it's width to the window's width) and changed it's cell class to the one I created;
• And then when the music is playing, every time a second goes by I do:

[_timeBarSlider setMinValue:0];
[_timeBarSlider setMaxValue:myTrack.duration];
[_timeBarSlider setDoubleValue:myPlayer.currentPosition];
[[_timeBarImageView animator] setFrame:NSMakeRect(_timeBarSliderCell.x, yourYCoordinate, yourWidth, yourHeight)];




_timerBarSlider 是NSSlider我在IB / _timerBarImageView 是包含垂直图像行的图像视图/ _timerBarSlderCell 是NSSlider的单元格（子类）



PS：NSSlider在该窗口中的每个对象后面，以便用户看不到它。您不能 setHidden：YES ，因为 drawKnob 方法不会被调用。

_timerBarSlider is the NSSlider I have in IB / _timerBarImageView is the image view that contains the vertical image line / _timerBarSlderCell is the NSSlider's cell (subclassed)

PS: the NSSlider is behind every object in that window, so that the user can't see it. You can't setHidden:YES on it because the drawKnob method will not be called.

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