带停止（非连续）的圆形NSSlider [英] Circular NSSlider with stop (non-continuous)

问题描述

我不知道如何将这更好地作为一个标题，但我需要使NSSlider作为一个正常的音量旋钮。在这一刻，它会旋转多次，我按住鼠标，并将其移动控件。我需要它停在0位置和100位置，我不能让它跳从0到100当我拖动它的方式。我希望我明白这一点。

解决方案

一个老问题，但是在这里我们还是走了：

（1）将滑块设置为有100个刻度

（2）选择 >

（3）在Interface Builder中，将自定义单元格类设置为 SBCustomSliderCell

使用下面的代码：

  @interface SBCustomSliderCell（）
 
 @property CGFloat lastSliderValue ; 
 
 @end 
 
 @implementation SBCustomSliderCell 
 
  - （void）awakeFromNib 
 {
 self.lastSliderValue = -1; 
} 
 
  - （double）closestTickMarkValueToValue：（double）value 
 {
 double proposedValue = [super closestTickMarkValueToValue：value]; 
 
 if（self.lastSliderValue == -1）
 {
 self.lastSliderValue = proposedValue; 
 return proposedValue; 
} 
 
 double MAX_JUMP = 50; 
 
 double tickDifference = ABS（self.lastSliderValue  -  proposedValue）; 
 
 BOOL isTurningUp = proposedValue> self.lastSliderValue; 
 
 if（tickDifference> MAX_JUMP）
 {
 proposedValue = isTurningUp？ 0.0：self.maxValue; 
} 
 
 NSLog（@value：％.2f gap：％.2f，proposedValue，tickDifference）; 
 
 self.lastSliderValue = proposedValue; 
 return proposedValue; 
} 
 
  - （NSRect）rectOfTickMarkAtIndex：（NSInteger）index 
 {
 return NSZeroRect; 
} 
 
 @end 
  

I am not sure how to phrase this better as a title but I need to make an NSSlider that functions as a normal volume knob. At the moment it will spin around as many times as I hold the mouse down and move it around the control. I need it to stop at the "0" position and the "100" position, I cannot have it jumping from 0 to 100 when I drag it the other way. I hope I am making this clear. Does anyone know how to do this or have any suggestions?

解决方案

An old question, but here we go anyway:

(1) Set the slider to have 100 tickmarks

(2) Select "Only stop at tickmarks"

(3) In Interface Builder, set the custom cell class to SBCustomSliderCell

Use the code below:

@interface SBCustomSliderCell()

@property CGFloat lastSliderValue;

@end

@implementation SBCustomSliderCell

- (void)awakeFromNib
{
    self.lastSliderValue = -1;
}

- (double)closestTickMarkValueToValue:(double)value
{
    double proposedValue = [super closestTickMarkValueToValue:value];

    if (self.lastSliderValue == -1)
    {
        self.lastSliderValue = proposedValue;
        return proposedValue;
    }

    double MAX_JUMP = 50;

    double tickDifference = ABS(self.lastSliderValue - proposedValue);

    BOOL isTurningUp = proposedValue > self.lastSliderValue;

    if (tickDifference > MAX_JUMP)
    {
        proposedValue = isTurningUp ? 0.0 : self.maxValue;
    }

    NSLog(@"value: %.2f gap: %.2f", proposedValue, tickDifference);

    self.lastSliderValue = proposedValue;
    return proposedValue;
}

- (NSRect)rectOfTickMarkAtIndex:(NSInteger)index
{
    return NSZeroRect;
}

@end

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