IOS-一步一步教你自定义评分星级条RatingBar ——转载的

由于项目的需要，需要设计能评分、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，Android是有RatingBar这个控件的（又发现一个IOS不如Android好的），那就只能自定义了，在网上也找了相关的例子，发现都是很老的版本了，非ARC版本的，而且不能评分成0分，还没有indicator效果，于是我自己重新写了一个控件，命名为RatingBar

先上一张我们做之后的效果图：

第一步：

写一个继承自UIView的RatingBar子控件

第二步：

声明一个RatingBar修改评分的代理，就是评分修改后把最新的评分告诉对方

第三步：

在.h文件中声明一些要暴漏给别人调用的方法

第四步：

在.m文件中实现评分条

具体代码如下：

RatingBar.h文件代码

#import <UIKit/UIKit.h>
@class RatingBar;

/**
 *  星级评分条代理
 */
@protocol RatingBarDelegate <NSObject>

/**
 *  评分改变
 *
 *  @param ratingBar 评分控件
 *  @param newRating 评分值
 */
- (void)ratingBar:(RatingBar *)ratingBar ratingChanged:(float)newRating;
@end

@interface RatingBar : UIView

/**
 *  初始化设置未选中图片、半选中图片、全选中图片，以及评分值改变的代理（可以用
 *  Block）实现
 *
 *  @param deselectedName   未选中图片名称
 *  @param halfSelectedName 半选中图片名称
 *  @param fullSelectedName 全选中图片名称
 *  @param delegate          代理
 */
- (void)setImageDeselected:(NSString *)deselectedName halfSelected:(NSString *)halfSelectedName fullSelected:(NSString *)fullSelectedName andDelegate:(id<RatingBarDelegate>)delegate;

/**
 *  设置评分值
 *
 *  @param rating 评分值
 */
- (void)displayRating:(float)rating;

/**
 *  获取当前的评分值
 *
 *  @return 评分值
 */
- (float)rating;

/**
 *  是否是指示器，如果是指示器，就不能滑动了，只显示结果，不是指示器的话就能滑动修改值
 *  默认为NO
 */
@property (nonatomic,assign) BOOL isIndicator;

@end

.m文件

#import "RatingBar.h"

@interface RatingBar (){
    float starRating;
    float lastRating;
    
    float height;
    float width;
    
    UIImage *unSelectedImage;
    UIImage *halfSelectedImage;
    UIImage *fullSelectedImage;
}

@property (nonatomic,strong) UIImageView *s1;
@property (nonatomic,strong) UIImageView *s2;
@property (nonatomic,strong) UIImageView *s3;
@property (nonatomic,strong) UIImageView *s4;
@property (nonatomic,strong) UIImageView *s5;

@property (nonatomic,weak) id<RatingBarDelegate> delegate;

@end

@implementation RatingBar

/**
 *  初始化设置未选中图片、半选中图片、全选中图片，以及评分值改变的代理（可以用
 *  Block）实现
 *
 *  @param deselectedName   未选中图片名称
 *  @param halfSelectedName 半选中图片名称
 *  @param fullSelectedName 全选中图片名称
 *  @param delegate          代理
 */
-(void)setImageDeselected:(NSString *)deselectedName halfSelected:(NSString *)halfSelectedName fullSelected:(NSString *)fullSelectedName andDelegate:(id<RatingBarDelegate>)delegate{
    
    self.delegate = delegate;
    
    unSelectedImage = [UIImage imageNamed:deselectedName];
    
    halfSelectedImage = halfSelectedName == nil ? unSelectedImage : [UIImage imageNamed:halfSelectedName];
    
    fullSelectedImage = [UIImage imageNamed:fullSelectedName];
    
    height = 0.0,width = 0.0;
    
    if (height < [fullSelectedImage size].height) {
        height = [fullSelectedImage size].height;
    }
    if (height < [halfSelectedImage size].height) {
        height = [halfSelectedImage size].height;
    }
    if (height < [unSelectedImage size].height) {
        height = [unSelectedImage size].height;
    }
    if (width < [fullSelectedImage size].width) {
        width = [fullSelectedImage size].width;
    }
    if (width < [halfSelectedImage size].width) {
        width = [halfSelectedImage size].width;
    }
    if (width < [unSelectedImage size].width) {
        width = [unSelectedImage size].width;
    }
    
    //控件宽度适配
    CGRect frame = [self frame];
    
    CGFloat viewWidth = width * 5;
    if (frame.size.width > viewWidth) {
        viewWidth = frame.size.width;
    }
    frame.size.width = viewWidth;
    frame.size.height = height;
    [self setFrame:frame];
    
    starRating = 0.0;
    lastRating = 0.0;
    
    _s1 = [[UIImageView alloc] initWithImage:unSelectedImage];
    _s2 = [[UIImageView alloc] initWithImage:unSelectedImage];
    _s3 = [[UIImageView alloc] initWithImage:unSelectedImage];
    _s4 = [[UIImageView alloc] initWithImage:unSelectedImage];
    _s5 = [[UIImageView alloc] initWithImage:unSelectedImage];
    
    
    //星星图片之间的间距
    CGFloat space = (CGFloat)(viewWidth - width*5)/6;
    
    CGFloat startX = space;
    [_s1 setFrame:CGRectMake(startX,         0, width, height)];
    startX += width + space;
    [_s2 setFrame:CGRectMake(startX,     0, width, height)];
    startX += width + space;
    [_s3 setFrame:CGRectMake(startX, 0, width, height)];
    startX += width + space;
    [_s4 setFrame:CGRectMake(startX, 0, width, height)];
    startX += width + space;
    [_s5 setFrame:CGRectMake(startX, 0, width, height)];
    
    [_s1 setUserInteractionEnabled:NO];
    [_s2 setUserInteractionEnabled:NO];
    [_s3 setUserInteractionEnabled:NO];
    [_s4 setUserInteractionEnabled:NO];
    [_s5 setUserInteractionEnabled:NO];
    
    [self addSubview:_s1];
    [self addSubview:_s2];
    [self addSubview:_s3];
    [self addSubview:_s4];
    [self addSubview:_s5];
    
}

/**
 *  设置评分值
 *
 *  @param rating 评分值
 */
-(void)displayRating:(float)rating{
    
    [_s1 setImage:unSelectedImage];
    [_s2 setImage:unSelectedImage];
    [_s3 setImage:unSelectedImage];
    [_s4 setImage:unSelectedImage];
    [_s5 setImage:unSelectedImage];
    
    if (rating >= 0.5) {
        [_s1 setImage:halfSelectedImage];
    }
    if (rating >= 1) {
        [_s1 setImage:fullSelectedImage];
    }
    if (rating >= 1.5) {
        [_s2 setImage:halfSelectedImage];
    }
    if (rating >= 2) {
        [_s2 setImage:fullSelectedImage];
    }
    if (rating >= 2.5) {
        [_s3 setImage:halfSelectedImage];
    }
    if (rating >= 3) {
        [_s3 setImage:fullSelectedImage];
    }
    if (rating >= 3.5) {
        [_s4 setImage:halfSelectedImage];
    }
    if (rating >= 4) {
        [_s4 setImage:fullSelectedImage];
    }
    if (rating >= 4.5) {
        [_s5 setImage:halfSelectedImage];
    }
    if (rating >= 5) {
        [_s5 setImage:fullSelectedImage];
    }
    
    starRating = rating;
    lastRating = rating;
    [_delegate ratingBar:self ratingChanged:rating];
}

/**
 *  获取当前的评分值
 *
 *  @return 评分值
 */
-(float)rating{
    return starRating;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesBegan:touches withEvent:event];
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    [self touchesRating:touches];
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [self touchesRating:touches];
}

//触发
- (void)touchesRating:(NSSet *)touches{
    if (self.isIndicator) {
        return;
    }
    
    CGPoint point = [[touches anyObject] locationInView:self];
    
    //星星图片之间的间距
    CGFloat space = (CGFloat)(self.frame.size.width - width*5)/6;
    
    float newRating = 0;
    
    if (point.x >= 0 && point.x <= self.frame.size.width) {
        
        if (point.x <= space+width*0.5f) {
            newRating = 0.5;
        }else if (point.x < space*2+width){
            newRating = 1.0;
        }else if (point.x < space*2+width*1.5){
            newRating = 1.5;
        }else if (point.x <= 3*space+2*width){
            newRating = 2.0;
        }else if (point.x <= 3*space+2.5*width){
            newRating = 2.5;
        }else if (point.x <= 4*space+3*width){
            newRating = 3.0;
        }else if (point.x <= 4*space+3.5*width){
            newRating = 3.5;
        }else if (point.x <= 5*space+4*width){
            newRating = 4.0;
        }else if (point.x <=5*space+4.5*width){
            newRating = 4.5;
        }else {
            newRating = 5.0;
        }
        
    }
    
    if (newRating != lastRating){
        [self displayRating:newRating];
    }
}

@end

调用：

#import "ViewController.h"
#import "RatingBar.h"

@interface ViewController ()<RatingBarDelegate>

@property (nonatomic,strong) UILabel *mLabel;

@property (nonatomic,strong) RatingBar *ratingBar1;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self setupViews];
}

#pragma mark - 初始化view
- (void)setupViews{
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    //RatingBar1
    CGFloat width = 200;
    CGFloat x = (self.view.bounds.size.width - width)*0.5;
    self.ratingBar1 = [[RatingBar alloc] initWithFrame:CGRectMake(x, 100, width, 50)];
    
    //添加到view中
    [self.view addSubview:self.ratingBar1];
    //是否是指示器
    self.ratingBar1.isIndicator = NO;
    [self.ratingBar1 setImageDeselected:@"iconfont-xingunselected" halfSelected:@"iconfont-banxing" fullSelected:@"iconfont-xing" andDelegate:self];
    
    //RatingBar2
    CGFloat width2 = 250;
    CGFloat x2 = (self.view.bounds.size.width - width2)*0.5;
    self.ratingBar2 = [[RatingBar alloc] initWithFrame:CGRectMake(x2, 200, width2, 50)];
    self.ratingBar2.isIndicator = NO;
    [self.ratingBar2 setImageDeselected:@"iconfont-xingunselected" halfSelected:@"iconfont-banxing" fullSelected:@"iconfont-xing" andDelegate:self];
    [self.view addSubview:self.ratingBar2];
    
    //RatingBar3
    CGFloat width3 = 300;
    CGFloat x3 = (self.view.bounds.size.width - width3)*0.5;
    self.ratingBar3 = [[RatingBar alloc] initWithFrame:CGRectMake(x3, 300, width3, 50)];
    self.ratingBar3.isIndicator = NO;
    [self.ratingBar3 setImageDeselected:@"iconfont-xingunselected" halfSelected:@"iconfont-banxing" fullSelected:@"iconfont-xing" andDelegate:self];
    [self.view addSubview:self.ratingBar3];
    
    //显示结果的UILabel
    CGFloat labelX = (self.view.bounds.size.width - 400)*0.5f;
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(labelX, 400, 400, 50)];
    label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:label];
    
    self.mLabel = label;
}

#pragma mark - RatingBar delegate
-(void)ratingBar:(RatingBar *)ratingBar ratingChanged:(float)newRating{
    if (self.ratingBar1 == ratingBar) {
        self.mLabel.text = [NSString stringWithFormat:@"第一个评分条的当前结果为:%.1f",newRating];
        
    }else if (self.ratingBar2 == ratingBar){
        self.mLabel.text = [NSString stringWithFormat:@"第二个评分条的当前结果为:%.1f",newRating];
        
    }else if (self.ratingBar3 == ratingBar){
        self.mLabel.text = [NSString stringWithFormat:@"第三个评分条的当前结果为:%.1f",newRating];
        
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end