StarView.m

//
//  StarView.m
//  BVMovie
//
//  Created by wangjin on 15/11/23.
//  Copyright (c) 2015年 wangjin. All rights reserved.
//

#import "StarView.h"

@implementation StarView
{
    UIView *yellowView;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/
//如果通过该方法初始化StarView对象 那么该方法将作为入口方法
-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        //创建星星视图
        [self createStarView];
    }
    return self;
}

//如果StarView是被画在xib文件中 则系统默认调用该方法（入口方法）
-(void)awakeFromNib
{
    //创建星星视图
    [self createStarView];
}

-(void)createStarView
{
    //获取灰色与黄色图片对象
    UIImage *garyImg = [UIImage imageNamed:@"gray@2x"];
    
    UIImage *yellowImg = [UIImage imageNamed:@"yellow@2x"];
    
    //获取图片宽高
    CGFloat width = yellowImg.size.width;
    
    CGFloat hight = yellowImg.size.height;
    
    //创建灰色星星视图
    UIView *grayView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width*5, hight)];
    //设置灰色星星视图背景图 图片会平铺展示
    grayView.backgroundColor = [UIColor colorWithPatternImage:garyImg];
    
    [self addSubview:grayView];
    
    //创建黄色星星视图
    yellowView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width*5, hight)];
    
    yellowView.backgroundColor = [UIColor colorWithPatternImage:yellowImg];
    [self addSubview:yellowView];
    
    
    //缩小或者放大星星视图
    //获取比例系数
    CGFloat scale = self.frame.size.width/yellowView.frame.size.width;
    
    //按比例缩放
    grayView.transform = CGAffineTransformMakeScale(scale, scale);
    
    yellowView.transform = CGAffineTransformMakeScale(scale, scale);
    
    //重新设置frame
    grayView.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    
    yellowView.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    
}
//根据传入分数设置黄色星星视图
-(void)setRatingFinal:(NSNumber *)ratingFinal
{
    _ratingFinal = ratingFinal;
    
    CGFloat ratingFinalf = [_ratingFinal floatValue];
    
    if (ratingFinalf<0) {
        ratingFinalf = 0;
    }
    
    //宽度比例
    CGFloat widthScale = ratingFinalf/10.0;
    
    //设置黄图宽度
    yellowView.frame = CGRectMake(0, 0, self.frame.size.width*widthScale, self.frame.size.height);
}

@end