订单评价五颗星实现

大体思路：
1.创建5个imageview，每个加上灰色星星图片（代表未选中）

2.1.手指滑动：手指在VC滑动时获取手指位置，判断手指位置在第几个星星处，获取星星个数，把手指前边的图片赋上黄色星星图片（代表选中）；
2.2.点击结束时判断点击位置，前边所有图片赋值黄色星星，获取星星个数。

在展示评价页面同理，根据评价的分数给展示星星的imageview重新设置图片。

2017年2月18日更新

Simulator Screen Shot 2017年2月18日下午7.01.32.png

更新内容：简化代码、分离出view，可直接使用。
Coding上Demo地址

EvaluateView中主要代码

#import "EvaluateView.h"

@implementation EvaluateView

- (instancetype)initWithFrame:(CGRect)frame count:(int)count
{
    self = [super initWithFrame:frame];
    
    if (self)
    {
        [self createStarsWithCounts:count];
    }
    
    return self;
}

/**
 创建星星的imageview
 */
- (void)createStarsWithCounts:(int)counts
{
    //计算左右间距
    CGFloat left = 20;
    CGFloat middle = 10;
    CGFloat width = (self.frame.size.width-2*left-middle*(counts-1))/counts;
    self.imgWidth = width;
    
    for (int i = 0; i < counts; i ++)
    {
        UIImageView *imgView = [[UIImageView alloc] initWithImage:UnSelectedImg];
        imgView.tag = i;
        [imgView setFrame:CGRectMake(left+i*width, left, width, width)];
        [self addSubview:imgView];
    }
}

/**
 手指滑动时判选中第几个星星
 */
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    CGPoint point = [[touches anyObject] locationInView:self];
    int x = point.x;
    int y = point.y;
    
    if (y >= 20 && y <= self.imgWidth + 20)     //Y在星星同一行
    {
        if (x > 20 && x < self.frame.size.width - 20)   //在星星范围内
        {
            self.count = (x - 20) / (self.imgWidth + 10) + 1;
            
            [self refreshUI];
        }
    }
}

/**
 点击结束时判断选择的星星位置
 */
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    CGPoint point = [[touches anyObject] locationInView:self];
    int x = point.x;
    int y = point.y;
    
    if (y >= 20 && y <= self.imgWidth + 20)     //Y在星星同一行
    {
        if (x > 20 && x < self.frame.size.width - 20)   //在星星范围内
        {
            self.count = (x - 20) / (self.imgWidth + 10) + 1;
            
            [self refreshUI];
        }
    }
}

/**
 根据选中星星数重新展示图片
 */
- (void)refreshUI
{
    //回调选中星星结果给VC
    if ([self.delegate respondsToSelector:@selector(selectedStras:)])
    {
        [self.delegate selectedStras:self.count];
    }
    
    for (UIImageView *imgView in self.subviews)
    {
        if (imgView.tag < self.count)
        {
            [imgView setImage:SelectedImg];
        }
        else
        {
            [imgView setImage:UnSelectedImg];
        }
    }
}

@end

以下是老代码，方便理解，但是质量不是很好。。。

1）滑动选择星星触发方法

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    CGPoint point = [[touches anyObject] locationInView:self.view];
    int x = point.x;
    int y = point.y;

    if (y >= 206 && y <= 246)   //第一个星星的坐标范围
    {
        if (x >= MWIDTH/2-120 && x <= MWIDTH/2 - 80)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.unSelectedImage];
            [self.imageView3 setImage:self.unSelectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"1";
        }
        else if (x > MWIDTH/2 - 70 && x <= MWIDTH/2 - 30)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.unSelectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"2";
        }
        else if (x > MWIDTH/2 - 20 && x <= MWIDTH/2 + 20)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"3";
        }
        else if (x > MWIDTH/2 + 30 && x <= MWIDTH/2 + 70)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.selectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"4";
        }
        else if (x > MWIDTH/2 + 80 && x <= MWIDTH/2 + 120)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.selectedImage];
            [self.imageView5 setImage:self.selectedImage];
            self.ranking = @"5";
        }
    }
}

2）直接点击星星触发方法

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{    
    CGPoint point = [[touches anyObject] locationInView:self.view];
    int x = point.x;
    int y = point.y;

    if (y >= 206 && y <= 246)   //第一个星星的坐标范围
    {
        if (x >= MWIDTH/2-120 && x <= MWIDTH/2 - 80)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.unSelectedImage];
            [self.imageView3 setImage:self.unSelectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"1";
        }
        else if (x > MWIDTH/2 - 70 && x <= MWIDTH/2 - 30)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.unSelectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"2";
        }
        else if (x > MWIDTH/2 - 20 && x <= MWIDTH/2 + 20)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.unSelectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"3";
        }
        else if (x > MWIDTH/2 + 30 && x <= MWIDTH/2 + 70)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.selectedImage];
            [self.imageView5 setImage:self.unSelectedImage];
            self.ranking = @"4";
        }
        else if (x > MWIDTH/2 + 80 && x <= MWIDTH/2 + 120)
        {
            [self.imageView1 setImage:self.selectedImage];
            [self.imageView2 setImage:self.selectedImage];
            [self.imageView3 setImage:self.selectedImage];
            [self.imageView4 setImage:self.selectedImage];
            [self.imageView5 setImage:self.selectedImage];
            self.ranking = @"5";
        }
    }
}

订单评价五颗星实现

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