iOS实现高性能简单易用的星星评分控件

@interface XWStarMaker : NSObject
@property (nonatomic, assign) CGFloat space;
@property (nonatomic, strong) NSString *defaultImage;
@property (nonatomic, strong) NSString *selectImage;
@property (nonatomic,assign) NSInteger maxValue;
@end

#import "YYLabel.h"
#import "XWStarMaker.h"
@class XWStarView;
@protocol XWStarViewDelegate <NSObject>
@optional
-(void)xw_starView:(XWStarView*)tagView star:(NSInteger)star;
@end
@interface XWStarView : YYLabel
@property (nonatomic, assign) NSInteger score;
@property (nonatomic,weak) id<XWStarViewDelegate> delegate;
-(instancetype)initWithFrame:(CGRect)frame maker:(void (^)(XWStarMaker *))makeBlock;
@end

@interface XWStarView ()
@property (nonatomic,strong) XWStarMaker *maker;
@end
@implementation XWStarView
-(instancetype)initWithFrame:(CGRect)frame maker:(void (^)(XWStarMaker *))makeBlock{
 if (self = [super initWithFrame:frame]) {
   self.maker = [[XWStarMaker alloc] init];
  if (makeBlock) {
   makeBlock(self.maker);
  }
  self.displaysAsynchronously = YES;
  self.fadeOnAsynchronouslyDisplay = NO;
  [self creatScoreAttr];
 }
 return self;
}
#pragma mark - private
-(void)creatScoreAttr{
 NSMutableAttributedString *text = [NSMutableAttributedString new];
 UIFont *font = [UIFont systemFontOfSize:0];
 for (int i = 0; i < self.maker.maxValue; i++) {
  UIImage *image = [UIImage imageNamed:self.maker.defaultImage];
  NSMutableAttributedString *attachText = [NSMutableAttributedString yy_attachmentStringWithContent:image contentMode:UIViewContentModeLeft attachmentSize:CGSizeMake(image.size.width + self.maker.space, image.size.height) alignToFont:font alignment:YYTextVerticalAlignmentCenter];
//添加点击事件
  __weak typeof(&*self) weakSelf = self;
  [attachText yy_setTextHighlightRange:NSMakeRange(0, 1) color:nil backgroundColor:nil tapAction:^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect){
   if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(xw_starView:star:)]) {
    [weakSelf.delegate xw_starView:weakSelf star:i];
   } 
  }];
  [text appendAttributedString:attachText];
 }
 self.attributedText = text;
}

-(void)setScore:(NSInteger)score{
 if (_score == score)
 {
  return;
 }
 _score = score;
 //获取图片资源
 NSArray *attachments = self.textLayout.attachments;
 for (int i = 0; i < attachments.count; i++) {
  YYTextAttachment *attachment = attachments[i];
  attachment.content = [UIImage imageNamed:i <= _score ? self.maker.selectImage : self.maker.defaultImage];
 }

}
@end

 _scoreView = [[XWStarView alloc] initWithFrame:CGRectMake(0, self.frame.size.height - 40, self.frame.size.width, 40) maker:^(XWStarMaker *maker){
   maker.defaultImage = @"goods_score_empt.png";
   maker.selectImage = @"goods_score_full.png";
   maker.space = 10;
  }];
  _scoreView.delegate = self;