#import "DrawingView.h"

  drawingView = [[DrawingView alloc]initWithFrame:CGRectMake(25, 100, [[UIScreen mainScreen] bounds].size.width - 50, [[UIScreen mainScreen] bounds].size.width - 50)];

  drawingView.delegate = self;

  drawingView.backgroundColor = [UIColor whiteColor];

  drawingView.percent = 0.0;

  drawingView.lineWidth = 10;

  [self.view addSubview:drawingView];

  @property (nonatomic ,assign)CGFloat percent;

  //percent指的是[0,1]的小数，默认0.5，数字越大表示微笑角度越大，0.5为面无表情，数字越接近0，表示越委屈，也就是利用percent进行运算得到打分结果

  @property (nonatomic ,assign)CGFloat lineWidth;

  //lineWidth指的是线框宽度，默认宽度是5

  -(void)drawingView:(DrawingView *)drawingView PercentChangeTo:(CGFloat)percent;