# MSStarEvaluator

**Repository Path**: mlsRepository/MSStarEvaluator

## Basic Information

- **Project Name**: MSStarEvaluator
- **Description**: 五星评价
- **Primary Language**: Objective-C
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2017-07-18
- **Last Updated**: 2020-12-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

#MSStarEvaluator
五星评价
//
//  MSStarEvaluator.h
//  Takeaway
//
//  Created by iOS on 2017/7/18.
//  Copyright © 2017年 MS. All rights reserved.
//

#import <UIKit/UIKit.h>

/**
 五星评价
 */
@interface MSStarEvaluator : UIControl

/**
 隐式属性动画
 */
@property (nonatomic) BOOL animation;
@property (copy, nonatomic) void(^starEvaluatorValueBlock)(CGFloat currentValue);

/**
 重写初始化方法

 @param frame frame
 @param emptyImgName 下层星星图片名字
 @param fullImgName 上星星图片名字
 @return 五星评价器
 */
- (instancetype)initWithFrame:(CGRect)frame emptyImgName:(NSString *)emptyImgName fullImgName:(NSString *)fullImgName;
/**
 设置初始星级

 @param initialValue 0-5
 @param block 星级变化回调
 */
- (void)setupInitialValue:(CGFloat)initialValue handle:(void(^)(CGFloat currentValue))block;

@end


//
//  MSStarEvaluator.m
//  Takeaway
//
//  Created by iOS on 2017/7/18.
//  Copyright © 2017年 MS. All rights reserved.
//

#import "MSStarEvaluator.h"

#define Space  8.0f

@interface MSStarEvaluator ()
{
    float   aWidth; //一个星星+间隙的宽度
    float   aStarWidth; //一个星星的宽度
    NSMutableArray  *fullStarArray;
}

@property (nonatomic) float currentValue;
@property (strong, nonatomic) NSString *emptyImgName, *fullImgName;

@end

@implementation MSStarEvaluator

- (instancetype)initWithFrame:(CGRect)frame emptyImgName:(NSString *)emptyImgName fullImgName:(NSString *)fullImgName
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        _emptyImgName = emptyImgName;
        _fullImgName = fullImgName;
        [self loadSubviews];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        _emptyImgName = @"StarEvaluator_StarEmpty";
        _fullImgName = @"StarEvaluator_Star";
        [self loadSubviews];
    }
    
    return self;
}

- (void)loadSubviews
{
    fullStarArray = [NSMutableArray arrayWithCapacity:5];
    
    for (int i = 0; i < 5; i ++)
    {
        CGFloat width = (self.bounds.size.width - Space * 4) / 5;
        
        aStarWidth = width;
        aWidth = width + Space;
        
        UIImageView *emptyImgView = [[UIImageView alloc] initWithFrame:CGRectMake(i * (width + Space), 0, width, width)];
        emptyImgView.image = [UIImage imageNamed:_emptyImgName];
        [self addSubview:emptyImgView];
        
        
        UIImageView *fullImgView = [[UIImageView alloc] initWithFrame:CGRectMake(i * (width + Space), 0, width, width)];
        fullImgView.contentMode = UIViewContentModeScaleToFill;
        fullImgView.image = [UIImage imageNamed:_fullImgName];
        
        CALayer *layer = [CALayer layer];
        layer.frame = CGRectMake(0, 0, 0, 0);
        layer.backgroundColor = [UIColor blackColor].CGColor;
        fullImgView.layer.mask = layer;
        
        [self addSubview:fullImgView];
        
        fullImgView.layer.mask.frame = CGRectMake(0, 0, 0, width);
        
        [fullStarArray addObject:fullImgView];
    }
}

- (void)setCurrentValue:(float)currentValue
{
    _currentValue = currentValue;
    [self setNeedsDisplay];
}

- (void)setupInitialValue:(CGFloat)initialValue handle:(void (^)(CGFloat))block
{
    self.currentValue = initialValue;
    
    self.starEvaluatorValueBlock = block;
}

- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint touchPoint = [touch locationInView:self];
    
    int n = (int)(touchPoint.x / aWidth); // 整颗星数
    float f = (touchPoint.x - n * Space - n * aStarWidth) / aStarWidth; // 半颗星比例
    
    f = MIN(f, 1.0f);
    
    self.currentValue = n + f;
    
    return YES;
}

- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint touchPoint = [touch locationInView:self];
    
    int c = (int)(touchPoint.x / aWidth); // 整颗星数
    float f = (touchPoint.x - c * Space - c * aStarWidth) / aStarWidth; // 半颗星比例
    
    f = MIN(f, 1.0f);
    
    self.currentValue = c + f;
    
    return YES;
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
    [CATransaction setDisableActions:!_animation];
    
    int c = (int)_currentValue;
    float f = _currentValue - c;
    
    for (int i = 0; i < 5; i++)
    {
        UIImageView *fullImgView = fullStarArray[i];
        
        if (i < c)
        {
            // 整颗星
            fullImgView.layer.mask.frame = CGRectMake(0, 0, aStarWidth, aStarWidth);;
        }
        else if (i == c)
        {
            fullImgView.layer.mask.frame = CGRectMake(0, 0, aStarWidth*f, aStarWidth);
        }
        else
        {
            fullImgView.layer.mask.frame = CGRectZero;
        }
    }
    
    if (self.starEvaluatorValueBlock)
    {
        self.starEvaluatorValueBlock(_currentValue);
    }
}


@end