电影评分星级显示效果的实现

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];

    //电影评分
    float score = 6.8;  //十分制

    //星星的图片
    UIImage *yellowStarImage = [UIImage imageNamed:@"yellow"];
    UIImage *grayStarImage = [UIImage imageNamed:@"gray"];

    float num = score/10*5; //十分制转换为5星制度

    //两个view的位置要相同，***星星宽度由num来决定
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(100, 100, num*(yellowStarImage.size.width), yellowStarImage.size.height)];
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 5*(grayStarImage.size.width), grayStarImage.size.height)];

    view1.backgroundColor = [UIColor colorWithPatternImage:yellowStarImage];
    view2.backgroundColor = [UIColor colorWithPatternImage:grayStarImage];

    //注意添加subView顺序，先添加灰色星星背景图，再添加***星星背景图
    [self.view addSubview:view2];
    [self.view addSubview:view1];

    // Do any additional setup after loading the view, typically from a nib.
}