iOS开发UI篇—自定义瀑布流控件（蘑菇街实现）

 1 //
 2 //  YYWaterflowView.h
 3 //  06-瀑布流
 4 //
 5 //  Created by apple on 14-7-29.
 6 //  Copyright (c) 2014年 wendingding. All rights reserved.
 7 //
 8 
 9 #import <UIKit/UIKit.h>
10 
11 //使用瀑布流形式展示内容的控件
12 typedef enum {
13     YYWaterflowViewMarginTypeTop,
14     YYWaterflowViewMarginTypeBottom,
15     YYWaterflowViewMarginTypeLeft,
16     YYWaterflowViewMarginTypeRight,
17     YYWaterflowViewMarginTypeColumn,//每一列
18     YYWaterflowViewMarginTypeRow,//每一行
19 
20 }YYWaterflowViewMarginType;
21 
22 @class YYWaterflowViewCell,YYWaterflowView;
23 
24 /**
25  *  1.数据源方法
26  */
27 @protocol YYWaterflowViewDataSource <NSObject>
28 //要求强制实现
29 @required
30 /**
31  * （1）一共有多少个数据
32  */
33 -(NSUInteger)numberOfCellsInWaterflowView:(YYWaterflowView *)waterflowView;
34 /**
35  *  (2)返回index位置对应的cell
36  */
37 -(YYWaterflowViewCell *)waterflowView:(YYWaterflowView *)waterflowView cellAtIndex:(NSUInteger)index;
38 
39 //不要求强制实现
40 @optional
41 /**
42  *  (3)一共有多少列
43  */
44 -(NSUInteger)numberOfColumnsInWaterflowView:(YYWaterflowView *)waterflowView;
45 
46 @end
47 
48 
49 /**
50  *  2.代理方法
51  */
52 @protocol YYWaterflowViewDelegate <UIScrollViewDelegate>
53 //不要求强制实现
54 @optional
55 /**
56  *  (1)第index位置cell对应的高度
57  */
58 -(CGFloat)waterflowView:(YYWaterflowView *)waterflowView heightAtIndex:(NSUInteger)index;
59 /**
60  *  (2)选中第index位置的cell
61  */
62 -(void)waterflowView:(YYWaterflowView *)waterflowView didSelectAtIndex:(NSUInteger)index;
63 /**
64  *  (3)返回间距
65  */
66 -(CGFloat)waterflowView:(YYWaterflowView *)waterflowView marginForType:(YYWaterflowViewMarginType)type;
67 @end
68 
69 
70 /**
71  *  3.瀑布流控件
72  */
73 @interface YYWaterflowView : UIScrollView
74 /**
75  *  (1)数据源
76  */
77 @property(nonatomic,weak)id<YYWaterflowViewDataSource> dadaSource;
78 /**
79  *  (2)代理
80  */
81 @property(nonatomic,weak)id<YYWaterflowViewDelegate> delegate;
82 
83 #pragma mark-公共方法
84 /*
85  *cell的宽度
86  */
87 -(CGFloat)cellWidth;
88 /**
89  *  刷新数据
90  */
91 -(void)reloadData;
92 /**
93  *  根据标识去缓存池中查找可循环利用的cell
94  */
95 - (id)dequeueReusableCellWithIdentifier:(NSString *)identifier;
96 @end

  1 //
  2 //  YYWaterflowView.m
  3 //  06-瀑布流
  4 //
  5 //  Created by apple on 14-7-29.
  6 //  Copyright (c) 2014年 wendingding. All rights reserved.
  7 //
  8 
  9 #import "YYWaterflowView.h"
 10 #import "YYWaterflowViewCell.h"
 11 #define YYWaterflowViewDefaultNumberOfClunms  3
 12 #define YYWaterflowViewDefaultCellH  100
 13 #define YYWaterflowViewDefaultMargin 10
 14 
 15 @interface YYWaterflowView()
 16 /**
 17  *  所有cell的frame数据
 18  */
 19 @property(nonatomic,strong)NSMutableArray *cellFrames;
 20 /**
 21  *  正在展示的cell
 22  */
 23 @property(nonatomic,strong)NSMutableDictionary  *displayingCells;
 24 /**
 25  *  缓存池（使用SET）
 26  */
 27 @property(nonatomic,strong)NSMutableSet *reusableCells;
 28 @end
 29 
 30 @implementation YYWaterflowView
 31 
 32 #pragma mark-懒加载
 33 -(NSMutableArray *)cellFrames
 34 {
 35     if (_cellFrames==nil) {
 36         _cellFrames=[NSMutableArray array];
 37     }
 38     return _cellFrames;
 39 }
 40 
 41 -(NSMutableDictionary *)displayingCells
 42 {
 43     if (_displayingCells==nil) {
 44         _displayingCells=[NSMutableDictionary dictionary];
 45     }
 46     return _displayingCells;
 47 }
 48 
 49 -(NSMutableSet *)reusableCells
 50 {
 51     if (_reusableCells==nil) {
 52         _reusableCells=[NSMutableSet set];
 53     }
 54     return _reusableCells;
 55 }
 56 
 57 - (id)initWithFrame:(CGRect)frame
 58 {
 59     self = [super initWithFrame:frame];
 60     if (self) {
 61     }
 62     return self;
 63 }
 64 
 65 -(void)willMoveToSuperview:(UIView *)newSuperview
 66 {
 67     [self reloadData];
 68 }
 69 
 70 #pragma mark-公共方法
 71 /**
 72  *  cell的宽度
 73  */
 74 -(CGFloat)cellWidth
 75 {
 76     //cell的列数
 77     int numberOfColumns=[self numberOfColumns];
 78     CGFloat leftM=[self marginForType:YYWaterflowViewMarginTypeLeft];
 79     CGFloat rightM=[self marginForType:YYWaterflowViewMarginTypeRight];
 80     CGFloat columnM=[self marginForType:YYWaterflowViewMarginTypeColumn];
 81     return (self.frame.size.width-leftM-rightM-(numberOfColumns-1)*columnM)/numberOfColumns;
 82 }
 83 
 84 /**
 85  *  刷新数据
 86  *  1.计算每个cell的frame
 87  */
 88 -(void)reloadData
 89 {
 90     //cell的总数是多少
 91     int numberOfCells=[self.dadaSource numberOfCellsInWaterflowView:self];
 92     
 93     //cell的列数
 94     int numberOfColumns=[self numberOfColumns];
 95     
 96     //间距
 97     CGFloat leftM=[self marginForType:YYWaterflowViewMarginTypeLeft];
 98    
 99     CGFloat columnM=[self marginForType:YYWaterflowViewMarginTypeColumn];
100     CGFloat topM=[self marginForType:YYWaterflowViewMarginTypeTop];
101     CGFloat rowM=[self marginForType:YYWaterflowViewMarginTypeRow];
102     CGFloat bottomM=[self marginForType:YYWaterflowViewMarginTypeBottom];
103     
104     //（1）cell的宽度
105     //cell的宽度=（整个view的宽度-左边的间距-右边的间距-（列数-1）X每列之间的间距）/总列数
106 //    CGFloat cellW=(self.frame.size.width-leftM-rightM-(numberOfColumns-1)*columnM)/numberOfColumns;
107     CGFloat cellW=[self cellWidth];
108     
109     //用一个C语言的数组来存放所有列的最大的Y值
110     CGFloat maxYOfColumns[numberOfColumns];
111     for (int i=0; i<numberOfColumns; i++) {
112         //初始化数组的数值全部为0
113         maxYOfColumns[i]=0.0;
114     }
115     
116     
117     //计算每个cell的fram
118     for (int i=0; i<numberOfCells; i++) {
119         
120         //(2)cell的高度
121         //询问代理i位置的高度
122         CGFloat cellH=[self heightAtIndex:i];
123         
124         //cell处在第几列（最短的一列）
125         NSUInteger cellAtColumn=0;
126         
127         //cell所处那列的最大的Y值（当前最短的那一列的最大的Y值）
128         //默认设置最短的一列为第一列（优化性能）
129         CGFloat maxYOfCellAtColumn=maxYOfColumns[cellAtColumn];
130         
131         //求出最短的那一列
132         for (int j=0; j<numberOfColumns; j++) {
133             if (maxYOfColumns[j]<maxYOfCellAtColumn) {
134                 cellAtColumn=j;
135                 maxYOfCellAtColumn=maxYOfColumns[j];
136             }
137         }
138         
139         //（3）cell的位置（X,Y）
140         //cell的X=左边的间距+列号*（cell的宽度+每列之间的间距）
141         CGFloat cellX=leftM+cellAtColumn*(cellW +columnM);
142         //cell的Y，先设定为0
143         CGFloat cellY=0;
144         if (maxYOfCellAtColumn==0.0) {//首行
145             cellY=topM;
146         }else
147         {
148             cellY=maxYOfCellAtColumn+rowM;
149         }
150         
151         //设置cell的frame并添加到数组中
152         CGRect cellFrame=CGRectMake(cellX, cellY, cellW, cellH);
153         [self.cellFrames addObject:[NSValue valueWithCGRect:cellFrame]];
154         
155         //更新最短那一列的最大的Y值
156         maxYOfColumns[cellAtColumn]=CGRectGetMaxY(cellFrame);
157         
158         //显示cell
159 //        YYWaterflowViewCell *cell=[self.dadaSource waterflowView:self cellAtIndex:i];
160 //        cell.frame=cellFrame;
161 //        [self addSubview:cell];
162     }
163     
164     //设置contentSize
165     CGFloat contentH=maxYOfColumns[0];
166     for (int i=1; i<numberOfColumns; i++) {
167         if (maxYOfColumns[i]>contentH) {
168             contentH=maxYOfColumns[i];
169         }
170     }
171     contentH += bottomM;
172     self.contentSize=CGSizeMake(0, contentH);
173 }
174 
175 /**
176  *  当UIScrollView滚动的时候也会调用这个方法
177  */
178 -(void)layoutSubviews
179 {
180     [super layoutSubviews];
181  
182     
183     //向数据源索要对应位置的cell
184     NSUInteger numberOfCells=self.cellFrames.count;
185     for (int i=0; i<numberOfCells; i++) {
186         //取出i位置的frame,注意转换
187         CGRect cellFrame=[self.cellFrames[i] CGRectValue];
188         
189         //优先从字典中取出i位置的cell
190         YYWaterflowViewCell *cell=self.displayingCells[@(i)];
191         
192         //判断i位置对应的frame在不在屏幕上（能否看见）
193         if ([self isInScreen:cellFrame]) {//在屏幕上
194             if (cell==nil) {
195                cell= [self.dadaSource waterflowView:self cellAtIndex:i];
196                 cell.frame=cellFrame;
197                 [self addSubview:cell];
198                 
199                 //存放在字典中
200                 self.displayingCells[@(i)]=cell;
201             }
202             
203         }else //不在屏幕上
204         {
205             if (cell) {
206                 //从scrollView和字典中删除
207                 [cell removeFromSuperview];
208                 [self.displayingCells removeObjectForKey:@(i)];
209                 
210                 //存放进缓存池
211                 [self.reusableCells addObject:cell];
212             }
213         }
214     }
215 //       NSLog(@"%d",self.subviews.count);
216 }
217 
218 -(id)dequeueReusableCellWithIdentifier:(NSString *)identifier
219 {
220    __block YYWaterflowViewCell *reusableCell=nil;
221     [self.reusableCells enumerateObjectsUsingBlock:^(YYWaterflowViewCell *cell, BOOL *stop) {
222         if ([cell.identifier isEqualToString:identifier]) {
223             reusableCell=cell;
224             *stop=YES;
225         }
226     }];
227     
228     if (reusableCell) {//从缓存池中移除（已经用掉了）
229         [self.reusableCells removeObject:reusableCell];
230     }
231     return reusableCell;
232 }
233 
234 #pragma mark cell的事件处理
235 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
236 {
237     //如果没有点击事件的代理方法，那么就直接返回
238     if (![self.delegate respondsToSelector:@selector(waterflowView:didSelectAtIndex:)])
239         return;
240     
241     //获得手指在屏幕上点击的触摸点
242     UITouch *touch=[touches anyObject];
243     CGPoint point1=[touch locationInView:touch.view];
244     CGPoint point=[touch locationInView:self];
245     NSLog(@"%@--%@",NSStringFromCGPoint(point),NSStringFromCGPoint(point1));
246     
247     __block NSNumber *selectIndex=nil;
248     [self.displayingCells enumerateKeysAndObjectsUsingBlock:^(id key, YYWaterflowViewCell *cell, BOOL *stop) {
249         if (CGRectContainsPoint(cell.frame, point)) {
250             selectIndex=key;
251             *stop=YES;
252         }
253     }];
254     if (selectIndex) {
255         //需要转换
256         [self.delegate waterflowView:self didSelectAtIndex:selectIndex.unsignedIntegerValue];
257     }
258     
259 }
260 #pragma mark-私有方法
261 /**
262  *  判断一个人cell的frame有没有显示在屏幕上
263  */
264 -(BOOL)isInScreen:(CGRect)frame
265 {
266 //    return (CGRectGetMaxY(frame)>self.contentOffset.y)&&(CGRectGetMaxY(frame)<self.contentOffset.y+self.frame.size.height);
267     return (CGRectGetMaxY(frame) > self.contentOffset.y) &&
268     (CGRectGetMinY(frame) < self.contentOffset.y + self.frame.size.height);
269 
270 }
271 -(CGFloat)marginForType:(YYWaterflowViewMarginType)type
272 {
273     if ([self.delegate respondsToSelector:@selector(waterflowView:marginForType:)]) {
274        return  [self.delegate waterflowView:self marginForType:type];
275     }else
276     {
277         return YYWaterflowViewDefaultMargin;
278     }
279 }
280 
281 -(NSUInteger)numberOfColumns
282 {
283     if ([self.dadaSource respondsToSelector:@selector(numberOfColumnsInWaterflowView:)]) {
284         return [self.dadaSource numberOfColumnsInWaterflowView:self];
285     }else
286     {
287         return  YYWaterflowViewDefaultNumberOfClunms;
288     }
289 }
290 
291 -(CGFloat)heightAtIndex:(NSUInteger)index
292 {
293     if ([self.delegate respondsToSelector:@selector(waterflowView:heightAtIndex:)]) {
294         return [self.delegate waterflowView:self heightAtIndex:index];
295     }else
296     {
297         return YYWaterflowViewDefaultCellH;
298     }
299 }
300 @end

 1 //
 2 //  YYShop.h
 3 //  06-瀑布流
 4 //
 5 //  Created by apple on 14-7-31.
 6 //  Copyright (c) 2014年 wendingding. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 @interface YYShop : NSObject
12 /**
13  *  图片的高度
14  */
15 @property(nonatomic,assign)CGFloat h;
16 /**
17  *  图片的宽度
18  */
19 @property(nonatomic,assign)CGFloat w;
20 /**
21  *  图片的网络地址
22  */
23 @property(nonatomic,copy)NSString *img;
24 /**
25  *  商品的价格
26  */
27 @property(nonatomic,copy)NSString *price;
28 @end

 1 //
 2 //  YYShopViewController.m
 3 //  06-瀑布流
 4 //
 5 //  Created by apple on 14-7-31.
 6 //  Copyright (c) 2014年 wendingding. All rights reserved.
 7 //
 8 
 9 #import "YYShopViewController.h"
10 #import "YYWaterflowView.h"
11 #import "YYWaterflowViewCell.h"
12 #import "YYShop.h"
13 #import "YYShopCell.h"
14 #import "MJExtension.h"
15 
16 @interface YYShopViewController ()<YYWaterflowViewDataSource,YYWaterflowViewDelegate>
17 @property(nonatomic,strong)NSMutableArray *shops;
18 @end
19 
20 @implementation YYShopViewController
21 
22 #pragma mark-懒加载
23 -(NSMutableArray *)shops
24 {
25     if (_shops==nil) {
26         _shops=[NSMutableArray array];
27     }
28     return _shops;
29 }
30 - (void)viewDidLoad
31 {
32     [super viewDidLoad];
33     //1.初始化数据
34     NSArray *newShop=[YYShop objectArrayWithFilename:@"1.plist"];
35     [self.shops addObjectsFromArray:newShop];
36     
37     //2.创建一个瀑布流
38     YYWaterflowView *waterflow=[[YYWaterflowView alloc]init];
39     waterflow.frame=self.view.bounds;
40     waterflow.delegate=self;
41     waterflow.dadaSource=self;
42     [self.view addSubview:waterflow];
43 }
44 #pragma mark-数据源方法
45 -(NSUInteger)numberOfCellsInWaterflowView:(YYWaterflowView *)waterflowView
46 {
47     return 40;
48 }
49 -(NSUInteger)numberOfColumnsInWaterflowView:(YYWaterflowView *)waterflowView
50 {
51     return 3;
52 }
53 -(YYWaterflowViewCell *)waterflowView:(YYWaterflowView *)waterflowView cellAtIndex:(NSUInteger)index
54 {
55     YYShopCell *cell=[YYShopCell cellWithwaterflowView:waterflowView];
56     cell.shop=self.shops[index];
57     return cell;
58 }
59 
60 
61 #pragma mark-代理方法
62 -(CGFloat)waterflowView:(YYWaterflowView *)waterflowView heightAtIndex:(NSUInteger)index
63 {
64     YYShop *shop=self.shops[index];
65     //根据Cell的宽度和图片的宽高比 算出cell的高度
66     return waterflowView.cellWidth*shop.h/shop.w;
67 }
68 
69 -(void)waterflowView:(YYWaterflowView *)waterflowView didSelectAtIndex:(NSUInteger)index
70 {
71     NSLog(@"点击了第%d个cell",index);
72 }
73 
74 
75 @end

 1 //
 2 //  YYShopCell.h
 3 //  06-瀑布流
 4 //  Created by apple on 14-7-31.
 5 //  Copyright (c) 2014年 wendingding. All rights reserved.
 6 //
 7 
 8 #import "YYWaterflowViewCell.h"
 9 
10 @class YYWaterflowView,YYShop;
11 @interface YYShopCell : YYWaterflowViewCell
12 @property(nonatomic,strong)YYShop *shop;
13 +(instancetype)cellWithwaterflowView:(YYWaterflowView *)waterflowView;
14 @end

 1 //
 2 //  YYShopCell.m
 3 //  06-瀑布流
 4 //
 5 //  Created by apple on 14-7-31.
 6 //  Copyright (c) 2014年 wendingding. All rights reserved.
 7 //
 8 
 9 #import "YYShopCell.h"
10 #import "YYWaterflowView.h"
11 #import "YYWaterflowViewCell.h"
12 #import "YYShop.h"
13 #import "UIImageView+WebCache.h"
14 
15 @interface YYShopCell ()
16 @property(nonatomic,strong)UIImageView *imageView;
17 @property(nonatomic,strong)UILabel *priceLabel;
18 @end
19 @implementation YYShopCell
20 
21 - (id)initWithFrame:(CGRect)frame
22 {
23     self = [super initWithFrame:frame];
24     if (self) {
25         UIImageView *imageView=[[UIImageView alloc]init];
26         [self addSubview:imageView];
27         self.imageView=imageView;
28         
29         UILabel *priceLabel=[[UILabel alloc]init];
30         priceLabel.backgroundColor=[UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
31         priceLabel.textAlignment=NSTextAlignmentCenter;
32         priceLabel.textColor=[UIColor whiteColor];
33         [self addSubview:priceLabel];
34         self.priceLabel=priceLabel;
35         
36     }
37     return self;
38 }
39 
40 +(instancetype)cellWithwaterflowView:(YYWaterflowView *)waterflowView
41 {
42     static NSString *ID=@"ID";
43     YYShopCell *cell=[waterflowView dequeueReusableCellWithIdentifier:ID];
44     if (cell==nil) {
45         cell=[[YYShopCell alloc]init];
46         cell.identifier=ID;
47     }
48     return cell;
49 }
50 
51 -(void)setShop:(YYShop *)shop
52 {
53     _shop=shop;
54     self.priceLabel.text=shop.price;
55     [self.imageView sd_setImageWithURL:[NSURL URLWithString:shop.img] placeholderImage:[UIImage imageNamed:@"loading"]];
56 }
57 
58 -(void)layoutSubviews
59 {
60     [super layoutSubviews];
61     
62     self.imageView.frame=self.bounds;
63     
64     CGFloat priceX=0;
65     CGFloat priceH=25;
66     CGFloat priceY=self.bounds.size.height-priceH;
67     CGFloat priceW=self.bounds.size.width;
68     
69     self.priceLabel.frame=CGRectMake(priceX, priceY, priceW, priceH);
70 }
71 @end

 1 //
 2 //  Prefix header
 3 //
 4 //  The contents of this file are implicitly included at the beginning of every source file.
 5 //
 6 
 7 #import <Availability.h>
 8 
 9 #ifndef __IPHONE_5_0
10 #warning "This project uses features only available in iOS SDK 5.0 and later."
11 #endif
12 
13 #ifdef __OBJC__
14     #import <UIKit/UIKit.h>
15     #import <Foundation/Foundation.h>
16 
17 // 颜色
18 #define YYColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
19 #define YYColorRGBA(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:a]
20 
21 // 随机色
22 #define YYRandomColor YYColor(arc4random_uniform(256), arc4random_uniform(256), arc4random_uniform(256))
23 #endif