iOS評分（評價）星星圖打分功能_IOS

 下載地址：https://github.com/littleSunZheng/StarGradeView

起因：項目中往往涉及到使用者的評分反饋，在我的“E中醫”項目中，涉及到幾處。對此我參考了美團和滴滴的評分圖。

評分視圖分為展示和評分兩種：

（1）多數情況下“評分功能”是要簡介易用的。那種 星星準確顯示百分比（分數）的功能反而不好用，這種多數用在顯示評分上，不需要使用者去點擊，因為使用者想評價“9.8分”，手指頭是不能準確點擊的。但是顯示的時候你根據資料可以完美的顯示出來。實現原理就是兩圖片，一張是“灰色”星星五顆，一張是“金色”星星五顆。讓imageView的模式設定好（多餘的照片不顯示）。按照比例將 上層 金色星星imageView的長調整好，星星比例就自然顯示好了。

（2）使用者操作打分的星星視圖：我這裡做的就是打分的。實現原理很簡單，當你操作其他軟體的功能時就能結合想到手勢。

上源碼：

//// StarGradeView.h// EcmCustomer//// Created by 鄭鵬 on 2016/11/4.// Copyright © 2016年 張進. All rights reserved.//#import <UIKit/UIKit.h>@protocol StarGradeViewDelegate <NSObject>- (void)didSelectedIndex:(NSString *)index;@end@interface StarGradeView : UIView@property (nonatomic, assign) id <StarGradeViewDelegate> delegate;// 視圖frame 和 想有幾個星星（取決於設計 5個常用 或者10個 ）- (instancetype)initWithFrame:(CGRect)frame withtNumberOfPart:(NSInteger)num;@end//// StarGradeView.m// EcmCustomer//// Created by 鄭鵬 on 2016/11/4.// Copyright © 2016年 張進. All rights reserved.//#import "StarGradeView.h"@interface StarGradeView(){UIView *_btnView;//放星星的背景viewUIView *_shouView;//放星星的背景viewCGFloat _height;//星星的高NSInteger _btnNum;//按鈕的數量NSInteger _index;//第幾個}@end@implementation StarGradeView- (instancetype)initWithFrame:(CGRect)frame withtNumberOfPart:(NSInteger)num{self = [super initWithFrame:frame];_height = frame.size.height;_btnNum = num;CGFloat selfW = frame.size.width;CGFloat starW = frame.size.height;_btnView = [[UIView alloc] initWithFrame:CGRectMake((selfW - starW*num)/2 , 0, starW*num, starW)];for (int i = 0; i< num; i++) {UIButton *starBtn = [UIButton buttonWithType:UIButtonTypeCustom];starBtn.frame = CGRectMake(starW * i, 0, starW, starW);[starBtn setImage:[UIImage imageNamed:@"star_off"] forState:UIControlStateNormal];[starBtn setImage:[UIImage imageNamed:@"star_on"] forState:UIControlStateSelected];starBtn.tag = 1991+i;[starBtn setAdjustsImageWhenHighlighted:NO];[_btnView addSubview:starBtn];}_shouView = [[UIView alloc] initWithFrame:CGRectMake(0 , 0, starW*num, starW)];[_btnView addSubview:_shouView];[self addSubview:_btnView];return self;}//滑動需要的。- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{CGPoint point = [self getTouchPoint:touches];int j = (int)(point.x/_height);_index = j;for (NSInteger i = 0; i < _btnNum; i++) {if (i<=j) {UIButton *btn = [_btnView viewWithTag:i+1991];btn.selected = YES;}else{UIButton *btn = [_btnView viewWithTag:i+1991];btn.selected = NO;}}}//滑動需要的。- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{CGPoint point = [self getTouchPoint:touches];int j = (int)(point.x/_height);_index = j;for (NSInteger i = 0; i < _btnNum; i++) {if (i<=j) {UIButton *btn = [_btnView viewWithTag:i+1991];btn.selected = YES;}else{UIButton *btn = [_btnView viewWithTag:i+1991];btn.selected = NO;}}}//滑動需要的。- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{if ([self.delegate respondsToSelector:@selector(didSelectedIndex:)]) {[self.delegate didSelectedIndex:[NSString stringWithFormat:@"%ld",_index+1]];}}//取到 手勢 在螢幕上點的 位置point- (CGPoint)getTouchPoint:(NSSet<UITouch *>*)touches{UITouch *touch = [touches anyObject];CGPoint point = [touch locationInView:_shouView];return point;}//如果點擊的範圍在 按鈕的地區- (BOOL)pointInBtn:(UIButton *)btn WithPoint:(CGPoint)point{if (CGRectContainsPoint(btn.frame, point)) {return YES;}else{return NO;}return nil;}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect {// Drawing code}*/@end

使用時：

StarGradeView *view = [[StarGradeView alloc] initWithFrame:CGRectMake(0, 100, 375, 40) withtNumberOfPart:5];view.delegate = self;[self.view addSubview:view];//並實現代理方法- (void)didSelectedIndex:(NSString *)index{NSLog(@"%@",index);}

注釋：這裡切圖時注意：只要一個星星，並且要求是 正方形 星星圖片有留白。看代碼就明白為什麼要這麼切圖。1是美觀 2是 容易計算。

以上所述是小編給大家介紹的iOS評分（評價）星星圖打分功能，希望對大家有所協助，如果大家有任何疑問請給我留言，小編會及時回複大家的。在此也非常感謝大家對雲棲社區網站的支援！