iOS 進度條：CMSteppedProgressBar

CMSteppedProgressBar 是一個定制化的，按步數前進的進度條，你可以改變進度條的顏色，動畫時長，動畫選項，步數的數量大小，進度點和進度線的大小。

/// set nbSteps in last because it will create all views, so if you want a custom design customize before setting the number of steps
@property (nonatomic) NSUInteger nbSteps;
/// set manually the currentStep or use stepNext/stepPrev
@property (nonatomic) NSUInteger currentStep;
/// change the line height between the dots, default is 5
@property (nonatomic) CGFloat linesHeight;
/// change the width of the dots, default is 20
@property (nonatomic) CGFloat dotsWidth;
/// anim duration, default is 0.6f
@property (nonatomic) NSTimeInterval animDuration;
/// anim type, default is curve ease in
@property (nonatomic) UIViewAnimationOptions animOption;
/// change the color of the bar when not filled, gray by default
@property (nonatomic, strong) UIColor* barColor;
/// change the color of the bar when it's filled, white by default
@property (nonatomic, strong) UIColor* tintColor;

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