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ios 教你 星星评分(支持点击和滑动)[原创]

iOS Sunny 16699浏览 2评论

由于项目的需要,要设计能评分、要能显示评分数据的星级评分条。但是ios上好像没有这个控件,所以只有自己想办法解决。对于这个功能需求,我总共想了两个方法,

方法一:(这种方法比较愚)

思路:这种方法是直接在storyboard上的viewController里面直接建5个UIImageView,初始值图片设置为“button_star_white”。
第一步,在storyboard中的viewController上推拽5个人UIImageView,连接到 “ViewController. h” 文件中,作为viewController的成员变量代码如下:

@property (weak, nonatomic) IBOutlet UIImageView *myImageview1;
@property (weak, nonatomic) IBOutlet UIImageView *myImageview2;
@property (weak, nonatomic) IBOutlet UIImageView *myImageview2;
@property (weak, nonatomic) IBOutlet UIImageView *myImageview3;
@property (weak, nonatomic) IBOutlet UIImageView *myImageview4;
@property (weak, nonatomic) IBOutlet UIImageView *myImageview5;

第二步,为每个imageView添加点击事件,代码如下:

_myImageview1.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress1)];
[_myImageview1 addGestureRecognizer:singleTap1];
_myImageview2.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress2)];
[_myImageview2 addGestureRecognizer:singleTap1];
...
(5个imageView同样方式,再次不一一赘述)

第三步,实现方方法:buttonpress1,buttonpress2,…3,4,5,代码如下:

- (void) buttonpress1{
       _myImageview1.image = [UIImage imageNamed:@"button_star_red"];
       _myImageview2.image = [UIImage imageNamed:@"button_star_white"];
       _myImageview3.image = [UIImage imageNamed:@"button_star_white"];
       _myImageview4.image = [UIImage imageNamed:@"button_star_white"];
       _myImageview5.image = [UIImage imageNamed:@"button_star_white"];
}
- (void) buttonpress1{
       _myImageview1.image = [UIImage imageNamed:@"button_star_red"];
       _myImageview2.image = [UIImage imageNamed:@"button_star_red"];
       _myImageview3.image = [UIImage imageNamed:@"button_star_white"];
       _myImageview4.image = [UIImage imageNamed:@"button_star_white"];
       _myImageview5.image = [UIImage imageNamed:@"button_star_white"];
}
 . . .
(5个imageView同样方式,再次不一一赘述)

好了,讲过上述的几个步骤,点击星星打分,就可以实现了,不过,说过了,这个方法很愚,因为重复代码的太多,而且还不支持滑动。下面我来介绍第二种方法。

方法二(这种方法相对高级一点,但是绝对不是最高级,我相信,优秀的马努,人才辈出)

思路:ios 中 touchesBegan和touchesMoved两个方法可以获取到UIView上的点击的坐标和滑动的坐标,根据坐标,位于X坐标左边的imageview设置为“button_star_red”,右边的设置为“button_star_red”。

第一步:在UIViewController上添加一个UIView(两种方式,直接拖拽或者在”.m”文件代码创建,这里直接拖拽)命名为:myview,width 为星星宽度的6倍(总共5颗星星,确保可以0分),heigh为星星的高度

@property (weak, nonatomic) IBOutlet UIView *myview;

第二步:在myview上添加imageview,将星星初始化为“button_star_white”,并且按顺序加入到数组中,便于后期遍历改变星星颜色,代码如下:

UIImageView *imageView;
    for (int i = 0; i < 5; i++) {
        imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"button_star_white"]];
        imageView.frame = CGRectMake(_myview.bounds.origin.x+((i+1)*24), _myview.bounds.origin.y, 24, 24);
        [_myview addSubview:imageView];
        [_allStar addObject:imageView];
    }

第三步:获取点击活着滑动的坐标,根据坐标,将坐标X以左的星星置为“button_star_white”(星星的宽和高都是24,)

#pragma mark - 点击的坐标
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:_myview];
    UIImageView *im ;
    for(int i = 0;i < 5 ; i++){
        im = _allStar[i];
        NSLog(@"_all[%i] = (%f,%f)",i,im.frame.origin.x,im.frame.origin.y);
        if ((touchPoint.x > 0)&&(touchPoint.x < 144)&&(touchPoint.y > 0)&&(touchPoint.y < 24)) {
            NSString *myscore = [NSString stringWithFormat:@"分数为:%i",((int)touchPoint.x)/24];
            _score.text = myscore;//_score是一个UILable,myscore为分数,显示在给用户看,关于这个不在赘述
            if (im.frame.origin.x > touchPoint.x) {
                im.image =[UIImage imageNamed:@"button_star_white"];
            }else{
                im.image =[UIImage imageNamed:@"button_star_red"];
            }
        }
    }
}
#pragma mark - 滑动的坐标
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:_myview];
    UIImageView *im ;
    for(int i = 0;i < 5 ; i++){
        im = _allStar[i];
        NSLog(@"_all[%i] = (%f,%f)",i,im.frame.origin.x,im.frame.origin.y);
        if ((touchPoint.x > 0)&&(touchPoint.x < 144)&&(touchPoint.y > 0)&&(touchPoint.y < 24)) {
            NSString *myscore = [NSString stringWithFormat:@"分数为:%i",((int)touchPoint.x)/24];
            _score.text = myscore;//_score是一个UILable,myscore为分数,显示在给用户看,关于这个不在赘述
            if (im.frame.origin.x > touchPoint.x) {
                im.image =[UIImage imageNamed:@"button_star_white"];
            }else{
                im.image =[UIImage imageNamed:@"button_star_red"];
            }
        }
    }
}

怎么样,与第一种方法,第二种方法效果是不是更智能,过程更明了。细心的读者会发现第二种方式的打分还可以支持小数。

附上星星图片,三种尺寸button_star_red button_star_red@2x button_star_red@3x button_star_white button_star_white@2x button_star_white@3x

转载时请注明出处及相应链接,本文永久地址:https://blog.yayuanzi.com/13038.html


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网友最新评论 (2)

  1. 效果不错!
    June2015-08-05 10:44
  2. 博主这个太棒了,大力支持 :mrgreen:
    唐先森2016-01-19 16:42