CLRollLabel

单行显示文字，会滚动的Label

    @property (nonatomic, strong) NSString *text; // 设置文字
    @property (nonatomic, strong) UIColor  *textColor;
    @property (nonatomic, strong) UIFont   *font;
    
    @property(nonatomic,assign) float rollSpeed; // 滚动速度，默认0.5
    
    /**
    *  初始化方法
    *  @param font  设置字体
    *  @param color 字体颜色
    */
    -(instancetype)initWithFrame:(CGRect)frame font:(UIFont *)font textColor:(UIColor *)color;
    
    - (instancetype)initWithFrame:(CGRect)frame;