iOS 數值選擇圓形控件：NOCircleSelector
NOCircleSelector 是 iOS 圓形控件，用來選擇給定數值。NOCircleSelector 支持高度自定義，所有三角形，外觀（textLabels, colours, imageView），文本之間的連接等等。可以被用來選擇一個范圍的數值或者單個數值。
結構:
有三種不同類型的對象：
- NOCircleSelector, which is an UIView and represents the whole area where the control is drawn. MIN(selector.width, selector.height) / 2 is the radius of selector.
- NOCircleDot, which is an UIView and represents the single dot. The size and all properties can be changed via properties. Don't forget about normal UIView properties. The control is easy to subclass so you can easily add custom views. To access it use delegate methods or dots array of NOCircleSelector.
- NOCircleDotConnection - a model class, representing the line between two NOCircleDot. You can customise it via properties. To access it use delegate methods or dotConnections array of NOCircleSelector. The recommended method to differ the dot is to use NS_ENUM and set tags of these.
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