OC开发_代码片段——代码编写自定义的tableViewCell

一、介绍

之前已经实现过通过简单的XIB文件来自定义我们的tableViewCell,包括每一步的步骤和代码：http://www.cnblogs.com/daomul/p/4355999.html

现在我们采取另外一种方式，通过纯编写代码来实现自定义我们的tableview，那么什么时候使用XIB，是这样的，当我们的cell的高度是固定的时候，我们可以采用XIB文件，如果我们的cell高度是不固定的，那么就需要使用代码编写了

二、效果

话不多说，上一个没有放图，这个先看我们大概做出来的效果如下：

三、实现步骤

四、代码清单

ViewController.m:

 1 //
 2 //  ViewController.m
 3 //  codeDefinedForTableviewcell
 4 //
 5 //  Created by bos on 15-3-22.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 #import "weiboCell.h"
11 #import "Weibo.h"
12 #import "WeiboFrame.h"
13 
14 @interface ViewController ()
15 {
16     //全局变量，对应着从文件中取得的数据
17     //NSMutableArray *_weibos;
18     NSMutableArray *_weiboFrames;
19 }
20 
21 @end
22 
23 @implementation ViewController
24 
25 - (void)viewDidLoad {
26     [super viewDidLoad];
27     
28     //从plist文件中加载数据数组
29     NSArray *arr = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"data.plist" ofType:nil]];
30     
31     //遍历添加到我们的微博模型中
32     _weiboFrames = [NSMutableArray array];
33     for (NSDictionary *dict in arr) {
34         WeiboFrame *wframe = [[WeiboFrame alloc]init];
35         wframe.weibo  = [Weibo weiboWithDict:dict];
36         
37         [_weiboFrames addObject:wframe];
38     }
39     /*_weibos = [NSMutableArray array];
40     for (NSDictionary *key in arr) {
41         
42         //每一个可变数组中存放每条模型(多少条就是对应着多少行 )
43         [_weibos addObject:[Weibo weiboWithDict:key]];
44     }*/
45 }
46 
47 - (void)didReceiveMemoryWarning {
48     [super didReceiveMemoryWarning];
49     // Dispose of any resources that can be recreated.
50 }
51 
52 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
53 {
54     return _weiboFrames.count;
55 }
56 
57 -(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
58 {
59     //1、去缓存池取出cell
60     weiboCell *cell = [tableView dequeueReusableCellWithIdentifier:[weiboCell getID]];
61     
62     //2、如果不存在缓存，则创建一个
63     if (cell ==nil) {
64         cell = [[weiboCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[weiboCell getID]];
65     }
66     
67     //3、传递模型数据(相当于setWeibo，没有传递则)
68     //WeiboFrame *wframe = [[WeiboFrame alloc] init];
69     //wframe.weibo = _weiboFrames[indexPath.row];
70     cell.weiboframe = _weiboFrames[indexPath.row];
71     
72     return  cell;
73 }
74 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
75 {
76     //WeiboFrame *wframe = [[WeiboFrame alloc] init];
77     //wframe.weibo = _weibofr[indexPath.row];
78     //return wframe.cellHeight;
79     
80     return [_weiboFrames[indexPath.row] cellHeight];
81 }
82 
83 @end

WeiboCell.h

 1 //
 2 //  weiboCell.h
 3 //  codeDefinedForTableviewcell
 4 //
 5 //  Created by bos on 15-3-22.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 //
 8 
 9 #import <UIKit/UIKit.h>
10 @class WeiboFrame;
11 
12 @interface weiboCell : UITableViewCell
13 
14 @property (nonatomic,strong) UILabel *iconlabel;
15 @property (nonatomic,strong) UILabel *namelabel;
16 @property (nonatomic ,strong) UILabel *timelabel;
17 @property (nonatomic,strong) UIImageView *vipImage;
18 @property (nonatomic,strong) UIImageView *picImage;
19 @property (nonatomic,strong) UILabel *contentLabel;
20 @property (nonatomic,strong) UILabel *from;
21 
22 @property (nonatomic,strong) WeiboFrame *weiboframe;
23 
24 +(NSString *)getID;
25 @end

WeiboCell.m

  1 //
  2 //  weiboCell.m 模型显示到我们的cell里面
  3 //  codeDefinedForTableviewcell
  4 //
  5 //  Created by bos on 15-3-22.
  6 //  Copyright (c) 2015年 axiba. All rights reserved.
  7 //
  8 
  9 #import "weiboCell.h"
 10 #import "Weibo.h"
 11 #import "WeiboFrame.h"
 12 
 13 #define kCellBorder 10
 14 #define kIconWH 40
 15 
 16 @interface weiboCell()
 17 {
 18     UIImageView *_icon;
 19     UILabel *_name;
 20     UILabel *_content;
 21     UIImageView *_vip;
 22     UIImageView *_pic;
 23     UILabel *_from;
 24     UILabel *_time;
 25 }
 26 
 27 @end
 28 
 29 @implementation weiboCell
 30 
 31 -(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 32 {
 33     self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
 34     if (self) {
 35         
 36         //不清楚高度则先添加基本得内部所有子控件
 37         [self setData];
 38     }
 39     
 40     return self;
 41 }
 42 
 43 #pragma  设置微博数据以及高度frame
 44 -(void)setWeiboframe:(WeiboFrame *)weiboframe
 45 {
 46     //1.将weibo负值给我们的weibo模型
 47     _weiboframe = weiboframe;
 48     
 49     //2.设置微博数据
 50     [self settingWeiboData];
 51     
 52     //3.设置子控件的frame
 53     [self settingWeiboFrame];
 54 }
 55 #pragma  设置微博数据
 56 -(void)settingWeiboData
 57 {
 58     Weibo *weibo = _weiboframe.weibo;
 59     //赋值
 60     _icon.image = [UIImage imageNamed:weibo.icon];
 61     
 62     _name.text = weibo.name;
 63     
 64     _content.text = weibo.content;
 65     _content.numberOfLines = 0;
 66     
 67     _from.text = weibo.from;
 68     
 69     _vip.hidden = !weibo.vip;
 70     
 71     _time.text = weibo.time;
 72     
 73     // 配图
 74     if (weibo.pic) {
 75         _pic.hidden = NO;
 76         _pic.image = [UIImage imageNamed:weibo.pic];
 77     }else
 78     {
 79         _pic.hidden = YES;
 80     }
 81 
 82 }
 83 #pragma  设置微博高度frame
 84 -(void) settingWeiboFrame
 85 {
 86     
 87     //1、头像
 88     _icon.frame = _weiboframe.iconFrame;
 89     
 90     //2、昵称
 91     _name.frame = _weiboframe.nameFrame;
 92     
 93     //3VIP图标
 94     _vip.frame = _weiboframe.vipFrame;
 95     
 96     //4、时间
 97     _time.frame = _weiboframe.timeFrame;
 98     
 99     //5来源
100     _from.frame = _weiboframe.fromFrame;
101     
102     //6正文
103     _content.frame = _weiboframe.contentFrame;
104     
105     
106     //7配图
107     if (_weiboframe.weibo.pic) {
108         
109         _pic.frame = _weiboframe.picFrame;
110     }
111 }
112 
113 
114 
115 #pragma  添加基本的内部控件
116 -(void)setData
117 {
118     //1、头像
119     _icon  = [[UIImageView alloc] init];
120     [self.contentView addSubview:_icon];
121     
122     //2、会员姓名
123     _name = [[UILabel alloc] init];
124     [self.contentView addSubview: _name];
125     
126     //3、时间
127     _time = [[UILabel alloc] init];
128     _time.font = [UIFont systemFontOfSize:12];
129     [self.contentView addSubview:_time];
130     
131     //4、正文
132      _content= [[UILabel alloc] init];
133     [self.contentView addSubview:_content];
134     
135     //5、VIP图标
136     _vip = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"vip.png"]];
137     [self.contentView addSubview:_vip];
138     
139     //6、微博配图
140      _pic= [[UIImageView alloc] init];
141     [self.contentView addSubview:_pic];
142     
143     //7、来源
144      _from = [[UILabel alloc] init];
145     _from.font = _time.font;
146     [self.contentView addSubview:_from];
147     
148     
149 }
150 
151 +(NSString *)getID
152 {
153     return @"cell";
154 }
155 
156 
157 @end

Weibo.h

 1 //
 2 //  Weibo.h
 3 //  codeDefinedForTableviewcell
 4 //
 5 //  Created by bos on 15-3-22.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 @interface Weibo : NSObject
12 
13 @property (nonatomic,copy) NSString *name;
14 @property (nonatomic,copy) NSString *icon;
15 @property (nonatomic,copy) NSString *time;
16 @property (nonatomic, copy) NSString *pic;
17 @property (nonatomic,copy) NSString *content;
18 @property (nonatomic,copy) NSString *from;
19 @property (nonatomic,assign) BOOL vip;
20 
21 -(id) initWithDict:(NSDictionary *)dict;
22 +(id) weiboWithDict:(NSDictionary *)dict;
23 
24 @end

Weibo.m

 1 //
 2 //  Weibo.m 模型
 3 //  codeDefinedForTableviewcell
 4 //
 5 //  Created by bos on 15-3-22.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 //
 8 
 9 #import "Weibo.h"
10 
11 @implementation Weibo
12 
13 -(id) initWithDict:(NSDictionary *)dict
14 {
15     if (self == [super init]) {
16         self.name =dict[@"name"];
17         self.icon = dict[@"icon"];
18         self.time = dict[@"time"];
19         self.content = dict[@"desc"];
20         self.from = dict[@"from"];
21         self.pic = dict[@"pic"];
22         self.vip = [dict[@"vip"] boolValue];
23     }
24     return self;
25 }
26 
27 //必须实现的类方法，否则类无法alloc 自己（self）
28 +(id) weiboWithDict:(NSDictionary *)dict
29 {
30     return [[self alloc] initWithDict:dict];
31 }
32 
33 @end

WeiboFrame.h

 1 //
 2 //  WeiboFrame.h
 3 //  codeDefinedForTableviewcell
 4 //
 5 //  Created by bos on 15-4-8.
 6 //  Copyright (c) 2015年 axiba. All rights reserved.
 7 // 用来存放某一个cell内部所有的子控件 的frame
 8 
 9 #import <Foundation/Foundation.h>
10 #import <UIKit/UIKit.h>
11 
12 @class Weibo;
13 @interface WeiboFrame : NSObject
14 
15 
16 // 头像 的frame
17 @property (nonatomic,assign,readonly) CGRect iconFrame;
18 // 是不是大V 的frame
19 @property (nonatomic,assign,readonly) CGRect vipFrame;
20 // 名字 的frame
21 @property (nonatomic,assign,readonly) CGRect nameFrame;
22 // 发表时间 的frame
23 @property (nonatomic,assign,readonly) CGRect timeFrame;
24 // 正文内容 的frame
25 @property (nonatomic,assign,readonly) CGRect contentFrame;
26 // 大图片 的frame
27 @property (nonatomic,assign,readonly) CGRect picFrame;
28 // 来自客户端 的frame
29 @property (nonatomic,assign,readonly) CGRect fromFrame;
30 
31 @property (nonatomic,assign,readonly) CGFloat cellHeight;
32 @property (nonatomic,strong) Weibo *weibo;
33 
34 @end

WeiboFram.m

  1 //
  2 //  WeiboFrame.m
  3 //  codeDefinedForTableviewcell
  4 //
  5 //  Created by bos on 15-4-8.
  6 //  Copyright (c) 2015年 axiba. All rights reserved.
  7 // yonglai
  8 
  9 
 10 #define kCellBorder 10
 11 #define kIconWH 40
 12 
 13 #import "WeiboFrame.h"
 14 #import "Weibo.h"
 15 
 16 @implementation WeiboFrame
 17 
 18 -(void) setWeibo:(Weibo *)weibo
 19 {
 20     _weibo = weibo;
 21     
 22     
 23     //1、头像
 24     CGFloat iconX = kCellBorder;
 25     CGFloat iconY = kCellBorder;
 26     _iconFrame = CGRectMake(iconX, iconY, kIconWH, kIconWH);
 27     
 28     //2、昵称
 29     CGFloat nameX = CGRectGetMaxX(_iconFrame) + kCellBorder;
 30     CGFloat nameY = iconY;
 31     //宽高取决于文字宽度
 32     CGSize nameSize = [self getLabelHeighDynamic:_weibo.name];
 33     _nameFrame = CGRectMake(nameX, nameY, nameSize.width, nameSize.height);
 34     
 35     //3VIP图标
 36     
 37     CGFloat vipX = CGRectGetMaxX(_nameFrame) + kCellBorder;
 38     CGFloat vipY = nameY;
 39     _vipFrame = CGRectMake(vipX, vipY, 20, 20);
 40     
 41     //4、时间
 42     CGFloat timeX = nameX;
 43     CGFloat timeY = CGRectGetMaxY(_nameFrame) + kCellBorder;
 44     CGSize timeSize =  [self getLabelHeighDynamic:_weibo.time];
 45     _timeFrame = CGRectMake(timeX, timeY, timeSize.width, timeSize.height);
 46     
 47     //5来源
 48     CGFloat fromX = CGRectGetMaxX(_timeFrame) +kCellBorder;
 49     CGFloat fromY = timeY;
 50     CGSize fromSize = [self getLabelHeighDynamic: _weibo.from];
 51     _fromFrame = CGRectMake(fromX, fromY, fromSize.width, fromSize.height);
 52     
 53     //6正文
 54     CGFloat contentX = iconX;
 55     CGFloat contentY = MAX(CGRectGetMaxY(_iconFrame), CGRectGetMaxY(_timeFrame));
 56     CGRect contentSize = [self getContentFrameDynamic: _weibo.content];
 57     _contentFrame = CGRectMake(contentX, contentY, contentSize.size.width, contentSize.size.height);
 58     
 59     
 60     //7配图
 61     if (_weibo.pic.length > 0) {
 62         
 63         CGFloat picX = contentX;
 64         CGFloat picY = CGRectGetMaxY(_contentFrame) +kCellBorder;
 65         _picFrame = CGRectMake(picX, picY, 80, 80);
 66         
 67         _cellHeight = CGRectGetMaxY(_picFrame) + kCellBorder;
 68     }
 69     else
 70     {
 71         _cellHeight = CGRectGetMaxY(_contentFrame) +kCellBorder;
 72     }
 73 }
 74 
 75 #pragma 根据文字长度动态确定label的高度
 76 -(CGSize)getLabelHeighDynamic:(NSString *)word
 77 {
 78     UIFont *fnt = [UIFont fontWithName:@"HelveticaNeue" size:18.0f];
 79     CGSize size = [word sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:fnt,NSFontAttributeName, nil]];
 80     return size;
 81 }
 82 
 83 #pragma 根据正文内容多少,动态确定正文content的frame
 84 
 85 -(CGRect)getContentFrameDynamic:(NSString *)word
 86 {
 87     // 宽度W
 88     CGFloat contentW = 320 - 2 *kCellBorder;
 89     // label的字体 HelveticaNeue  Courier
 90     UIFont *fnt = [UIFont fontWithName:@"HelveticaNeue" size:18.0f];
 91     //_content.font = fnt;
 92     
 93     //_content.lineBreakMode = NSLineBreakByWordWrapping;
 94     // iOS7中用以下方法替代过时的iOS6中的sizeWithFont:constrainedToSize:lineBreakMode:方法
 95     CGRect tmpRect = [word boundingRectWithSize:CGSizeMake(contentW, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:[NSDictionary dictionaryWithObjectsAndKeys:fnt,NSFontAttributeName, nil] context:nil];
 96     
 97     return tmpRect;
 98     
 99 }
100 
101 
102 @end

五、遇到的问题总结

1、number函数写错，记得是tableview先写，否则导致无法执行cellforRowAtIndexpath无法执行

2、忘记传递模型数据，导致set方法没有执行

3、IOS7中用以下方法

- (CGSize)sizeWithAttributes:(NSDictionary *)attrs;

替代过时的iOS6中的- (CGSize)sizeWithFont:(UIFont *)font 方法

4、如果头文件中遇到类似于“编绎显示Unknown type name “CGFloat” 错误解决方法”

直接加头文件：

#import <UIKit/UIKit.h>或者将Compile Sources As 改为 Objective-C++

5、在ViewDidLoad使用以下方法在取缓存池的值的时候，可以不用判断是否为空，会自动取缓冲取值，适用于6.0+

［self.tableView registerClass:[Mycell class] forCellReuseIdenifier:@"cellID"］;

六、源代码下载地址：

http://pan.baidu.com/s/1kTqsTpH