1、上效果圖：

2、
第一個是顯示的7.2分的評分
第二個可以點選選擇評分

3、主要程式碼：

- (void)creatStarView{
    UIImage *gray   = [UIImage imageNamed:@"starGrey"];
    UIImage *yellow = [UIImage imageNamed:@"strayellow"];

    //1.獲取星星檢視的初始寬高
    CGFloat width  = gray.size.width *5;
    CGFloat height = gray.size.height;

    //2.初始化星星檢視
    _grayView = [[UIView alloc] initWithFrame:CGRectMake(0
 
, 0, width, height)];
    [_grayView setBackgroundColor:[UIColor colorWithPatternImage:gray]]; // 平鋪
    [self addSubview:_grayView];

    _yellowView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
    [_yellowView setBackgroundColor:[UIColor colorWithPatternImage:yellow]]; // 平鋪
    [self addSubview:_yellowView];
 


    //3.放大星星檢視與self等高等寬
    CGFloat scaleW = self.frame.size.width/width;
    CGFloat scaleH = self.frame.size.height/height;

    _grayView.transform   = CGAffineTransformMakeScale(scaleW, scaleH);
    _yellowView.transform = CGAffineTransformMakeScale(scaleW, scaleH);

    //4.重置星星檢視座標
    _grayView.frame
 
   = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    _yellowView.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);

}

-(void)setRating:(float)rating{
//    _rating = rating;
    _yellowView.frame = CGRectMake(0, 0, self.frame.size.width *rating/10, self.frame.size.height);
}