多个 DCSlider 发送不同的控制值(Xcode) [英] Multiple DCSliders sending different control values (Xcode)

问题描述

这个问题可能非常具体，但我是新手，真的需要一些帮助.

This question may be very specific, but I'm new to all this and really need some help.

我正在构建一个 iPhone 合成器应用.我正在使用 DCSliders 和 DCKnobs(它们看起来比标准 UISliders 更好).

I'm building an iPhone synth app. I am using DCSliders an DCKnobs (they look nicer than the standard UISliders).

https://github.com/domesticcatsoftware/DCControls#readme

我也在使用 libpd(一个 Pure Data 库)，因此音频 DSP 由嵌入式 Pure Data 补丁处理.

I am also working with libpd (a Pure Data library) so the audio DSP is handled by an embedded Pure Data patch.

https://gitorious.org/pdlib

我的界面中有多个 DCSlider 和 DCKnobs.我可以通过将类设置为 DCSlider 的委托，将控制值从滑块/旋钮发送到 Pure Data...

I have got multiple DCSliders and DCKnobs in my interface. I am able to send control values from the sliders/knobs to Pure Data by making a class the delegate of the DCSlider...

- (void)loadView {
  [super loadView];
  self.mySlider = [[[DCSlider alloc] initWithDelegate:self] autorelease];
  self.mySlider.frame = CGRectMake(10.0, 10.0, 20.0, 120.0);

  [self.view addSubview:self.mySlider];
}

然后我实现了一种方法，将控制值发送到 Pure Data 中的接收器...

Then I implement a method to send control values to a receiver in Pure Data...

- (void)controlValueDidChange:(float)value sender:(id)sender {  
    [PdBase sendFloat:value toReceiver:@"beatvol"];
}

一切正常.

问题是所有滑块都发送相同的控制值.

The problem is that all of the sliders are sending the same control values.

如何让每个 DCSlider 将独立的控制值发送到 Pure Data 中的不同接收器?

How do I get each of the DCSliders to send independent control values to different receivers in Pure Data?

推荐答案

您需要为滑块分配一个标签.然后在 controlValueDidChange: 中，您需要获取该标签并根据标签执行您的操作:

You need to assign a tag to your sliders. Then in controlValueDidChange: you need to get that tag and do your actions according to the tags:

- (void)loadView 
{
    [super loadView];
    mySlider = [[[DCSlider alloc] initWithDelegate:self] autorelease];
    mySlider.frame = CGRectMake(10.0, 10.0, 20.0, 120.0);
    mySlider.tag = 0;
    [self.view addSubview: mySlider];
}
- (void)controlValueDidChange:(float)value sender:(id)sender 
{  
    DCSlider * slider = (DCSlider *)sender;

    switch (slider.tag) 
    {
        case 0: 
        { 
            [PdBase sendFloat:value toReceiver:@"beatvol"];
        }
            break;
        case 1: 
        { 
            /*  do something for the 2nd slider  */;
        }
            break;
    }        
}

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