iOS开发UI篇—使用纯代码自定义UItableviewcell实现一个简单的微博界面布局

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface NJWeibo : NSObject
 4 @property (nonatomic, copy) NSString *text; // 内容
 5 @property (nonatomic, copy) NSString *icon; // 头像
 6 @property (nonatomic, copy) NSString *name; // 昵称
 7 @property (nonatomic, copy) NSString *picture; // 配图
 8 @property (nonatomic, assign) BOOL vip;
 9 
10 - (id)initWithDict:(NSDictionary *)dict;
11 + (id)weiboWithDict:(NSDictionary *)dict;
12 @end

 1 @implementation NJWeibo
 2 
 3 - (id)initWithDict:(NSDictionary *)dict
 4 {
 5     if (self = [super init]) {
 6         [self setValuesForKeysWithDictionary:dict];
 7     }
 8     return self;
 9 }
10 
11 + (id)weiboWithDict:(NSDictionary *)dict
12 {
13     return [[self alloc] initWithDict:dict];
14 }
15 
16 @end

 1 #import <UIKit/UIKit.h>
 2 @class NJWeiboFrame;
 3 
 4 @interface NJWeiboCell : UITableViewCell
 5 /**
 6  *  接收外界传入的模型
 7  */
 8 //@property (nonatomic, strong) NJWeibo *weibo;
 9 
10 @property (nonatomic, strong) NJWeiboFrame *weiboFrame;
11 
12 + (instancetype)cellWithTableView:(UITableView *)tableView;
13 @end

  1 #import "NJWeiboCell.h"
  2 #import "NJWeibo.h"
  3 #import "NJWeiboFrame.h"
  4 
  5 #define NJNameFont [UIFont systemFontOfSize:15]
  6 #define NJTextFont [UIFont systemFontOfSize:16]
  7 
  8 @interface NJWeiboCell ()
  9 /**
 10  *  头像
 11  */
 12 @property (nonatomic, weak) UIImageView *iconView;
 13 /**
 14  *  vip
 15  */
 16 @property (nonatomic, weak) UIImageView *vipView;
 17 /**
 18  *  配图
 19  */
 20 @property (nonatomic, weak) UIImageView *pictureView;
 21 /**
 22  *  昵称
 23  */
 24 @property (nonatomic, weak) UILabel *nameLabel;
 25 /**
 26  *  正文
 27  */
 28 @property (nonatomic, weak) UILabel *introLabel;
 29 @end
 30 
 31 @implementation NJWeiboCell
 32 
 33 + (instancetype)cellWithTableView:(UITableView *)tableView
 34 {
 35     // NSLog(@"cellForRowAtIndexPath");
 36     static NSString *identifier = @"status";
 37     // 1.缓存中取
 38     NJWeiboCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
 39     // 2.创建
 40     if (cell == nil) {
 41         cell = [[NJWeiboCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
 42     }
 43     return cell;
 44 }
 45 
 46 
 47 /**
 48  *  构造方法(在初始化对象的时候会调用)
 49  *  一般在这个方法中添加需要显示的子控件
 50  */
 51 - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 52 {
 53     self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
 54     if (self) {
 55         // 让自定义Cell和系统的cell一样, 一创建出来就拥有一些子控件提供给我们使用
 56         // 1.创建头像
 57         UIImageView *iconView = [[UIImageView alloc] init];
 58         [self.contentView addSubview:iconView];
 59         self.iconView = iconView;
 60         
 61         // 2.创建昵称
 62         UILabel *nameLabel = [[UILabel alloc] init];
 63         nameLabel.font = NJNameFont;
 64         // nameLabel.backgroundColor = [UIColor redColor];
 65         [self.contentView addSubview:nameLabel];
 66         self.nameLabel = nameLabel;
 67         
 68         // 3.创建vip
 69         UIImageView *vipView = [[UIImageView alloc] init];
 70         vipView.image = [UIImage imageNamed:@"vip"];
 71         [self.contentView addSubview:vipView];
 72         self.vipView = vipView;
 73         
 74         // 4.创建正文
 75         UILabel *introLabel = [[UILabel alloc] init];
 76         introLabel.font = NJTextFont;
 77         introLabel.numberOfLines = 0;
 78         // introLabel.backgroundColor = [UIColor greenColor];
 79         [self.contentView addSubview:introLabel];
 80         self.introLabel = introLabel;
 81         
 82         // 5.创建配图
 83         UIImageView *pictureView = [[UIImageView alloc] init];
 84         [self.contentView addSubview:pictureView];
 85         self.pictureView = pictureView;
 86         
 87     }
 88     return self;
 89 }
 90 
 91 
 92 - (void)setWeiboFrame:(NJWeiboFrame *)weiboFrame
 93 {
 94     _weiboFrame = weiboFrame;
 95     
 96     // 1.给子控件赋值数据
 97     [self settingData];
 98     // 2.设置frame
 99     [self settingFrame];
100 }
101 
102 
103 /**
104  *  设置子控件的数据
105  */
106 - (void)settingData
107 {
108     NJWeibo *weibo = self.weiboFrame.weibo;
109     
110     // 设置头像
111     self.iconView.image = [UIImage imageNamed:weibo.icon];
112     // 设置昵称
113     self.nameLabel.text = weibo.name;
114     // 设置vip
115     if (weibo.vip) {
116         self.vipView.hidden = NO;
117         self.nameLabel.textColor = [UIColor redColor];
118     }else
119     {
120         self.vipView.hidden = YES;
121         self.nameLabel.textColor = [UIColor blackColor];
122     }
123     // 设置内容
124     self.introLabel.text = weibo.text;
125     
126     // 设置配图
127     if (weibo.picture) {// 有配图
128         self.pictureView.image = [UIImage imageNamed:weibo.picture];
129         self.pictureView.hidden = NO;
130     }else
131     {
132         self.pictureView.hidden = YES;
133     }
134 }
135 /**
136  *  设置子控件的frame
137  */
138 - (void)settingFrame
139 {
140 
141        // 设置头像的frame
142     self.iconView.frame = self.weiboFrame.iconF;
143     
144     // 设置昵称的frame
145         self.nameLabel.frame = self.weiboFrame.nameF;
146     
147     // 设置vip的frame
148        self.vipView.frame = self.weiboFrame.vipF;
149     
150     // 设置正文的frame
151        self.introLabel.frame = self.weiboFrame.introF;
152     
153     // 设置配图的frame
154 
155     if (self.weiboFrame.weibo.picture) {// 有配图
156         self.pictureView.frame = self.weiboFrame.pictrueF;
157     }
158 }
159 
160 /**
161  *  计算文本的宽高
162  *
163  *  @param str     需要计算的文本
164  *  @param font    文本显示的字体
165  *  @param maxSize 文本显示的范围
166  *
167  *  @return 文本占用的真实宽高
168  */
169 - (CGSize)sizeWithString:(NSString *)str font:(UIFont *)font maxSize:(CGSize)maxSize
170 {
171     NSDictionary *dict = @{NSFontAttributeName : font};
172     // 如果将来计算的文字的范围超出了指定的范围,返回的就是指定的范围
173     // 如果将来计算的文字的范围小于指定的范围, 返回的就是真实的范围
174     CGSize size =  [str boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil].size;
175     return size;
176 }
177 
178 @end

 1 //  专门用来保存每一行数据的frame, 计算frame
 2 
 3 #import <Foundation/Foundation.h>
 4 @class NJWeibo;
 5 @interface NJWeiboFrame : NSObject
 6 /**
 7  *  头像的frame
 8  */
 9 @property (nonatomic, assign) CGRect iconF;
10 /**
11  *  昵称的frame
12  */
13 @property (nonatomic, assign) CGRect nameF;
14 /**
15  *  vip的frame
16  */
17 @property (nonatomic, assign) CGRect vipF;
18 /**
19  *  正文的frame
20  */
21 @property (nonatomic, assign) CGRect introF;
22 /**
23  *  配图的frame
24  */
25 @property (nonatomic, assign) CGRect pictrueF;
26 /**
27  *  行高
28  */
29 @property (nonatomic, assign) CGFloat cellHeight;
30 
31 /**
32  *  模型数据
33  */
34 @property (nonatomic, strong) NJWeibo *weibo;
35 @end

 1 #import "NJWeiboFrame.h"
 2 #import "NJWeibo.h"
 3 #define NJNameFont [UIFont systemFontOfSize:15]
 4 #define NJTextFont [UIFont systemFontOfSize:16]
 5 
 6 
 7 @implementation NJWeiboFrame
 8 
 9 
10 - (void)setWeibo:(NJWeibo *)weibo
11 {
12     _weibo = weibo;
13     
14     // 间隙
15     CGFloat padding = 10;
16     
17     // 设置头像的frame
18     CGFloat iconViewX = padding;
19     CGFloat iconViewY = padding;
20     CGFloat iconViewW = 30;
21     CGFloat iconViewH = 30;
22     self.iconF = CGRectMake(iconViewX, iconViewY, iconViewW, iconViewH);
23     
24     // 设置昵称的frame
25     // 昵称的x = 头像最大的x + 间隙
26     CGFloat nameLabelX = CGRectGetMaxX(self.iconF) + padding;
27     // 计算文字的宽高
28     CGSize nameSize = [self sizeWithString:_weibo.name font:NJNameFont maxSize:CGSizeMake(MAXFLOAT, MAXFLOAT)];
29     
30     CGFloat nameLabelH = nameSize.height;
31     CGFloat nameLabelW = nameSize.width;
32     CGFloat nameLabelY = iconViewY + (iconViewH - nameLabelH) * 0.5;
33    self.nameF = CGRectMake(nameLabelX, nameLabelY, nameLabelW, nameLabelH);
34     
35     // 设置vip的frame
36     CGFloat vipViewX = CGRectGetMaxX(self.nameF) + padding;
37     CGFloat vipViewY = nameLabelY;
38     CGFloat vipViewW = 14;
39     CGFloat vipViewH = 14;
40     self.vipF = CGRectMake(vipViewX, vipViewY, vipViewW, vipViewH);
41     
42     // 设置正文的frame
43     CGFloat introLabelX = iconViewX;
44     CGFloat introLabelY = CGRectGetMaxY(self.iconF) + padding;
45     CGSize textSize =  [self sizeWithString:_weibo.text font:NJTextFont maxSize:CGSizeMake(300, MAXFLOAT)];
46     
47     CGFloat introLabelW = textSize.width;
48     CGFloat introLabelH = textSize.height;
49     
50     self.introF = CGRectMake(introLabelX, introLabelY, introLabelW, introLabelH);
51     
52     // 设置配图的frame
53     CGFloat cellHeight = 0;
54     if (_weibo.picture) {// 有配图
55         CGFloat pictureViewX = iconViewX;
56         CGFloat pictureViewY = CGRectGetMaxY(self.introF) + padding;
57         CGFloat pictureViewW = 100;
58         CGFloat pictureViewH = 100;
59         self.pictrueF = CGRectMake(pictureViewX, pictureViewY, pictureViewW, pictureViewH);
60         
61         // 计算行高
62         self.cellHeight = CGRectGetMaxY(self.pictrueF) + padding;
63     }else
64     {
65         // 没有配图情况下的行高
66         self.cellHeight = CGRectGetMaxY(self.introF) + padding;
67     }
68     
69 }
70 
71 /**
72  *  计算文本的宽高
73  *
74  *  @param str     需要计算的文本
75  *  @param font    文本显示的字体
76  *  @param maxSize 文本显示的范围
77  *
78  *  @return 文本占用的真实宽高
79  */
80 - (CGSize)sizeWithString:(NSString *)str font:(UIFont *)font maxSize:(CGSize)maxSize
81 {
82     NSDictionary *dict = @{NSFontAttributeName : font};
83     // 如果将来计算的文字的范围超出了指定的范围,返回的就是指定的范围
84     // 如果将来计算的文字的范围小于指定的范围, 返回的就是真实的范围
85     CGSize size =  [str boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil].size;
86     return size;
87 }
88 @end

 1 #import "NJViewController.h"
 2 #import "NJWeibo.h"
 3 #import "NJWeiboCell.h"
 4 #import "NJWeiboFrame.h"
 5 
 6 @interface NJViewController ()
 7 @property (nonatomic, strong) NSArray *statusFrames;
 8 @end
 9 
10 @implementation NJViewController
11 
12 #pragma mark - 数据源方法
13 
14 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
15 {
16     return self.statusFrames.count;
17 }
18 
19 
20 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
21 {
22     NJWeiboCell *cell = [NJWeiboCell cellWithTableView:tableView];
23     // 3.设置数据
24    cell.weiboFrame = self.statusFrames[indexPath.row];
25     
26     // 4.返回
27     return cell;
28 }
29 #pragma mark - 懒加载
30 - (NSArray *)statusFrames
31 {
32     if (_statusFrames == nil) {
33         NSString *fullPath = [[NSBundle mainBundle] pathForResource:@"statuses.plist" ofType:nil];
34         NSArray *dictArray = [NSArray arrayWithContentsOfFile:fullPath];
35         NSMutableArray *models = [NSMutableArray arrayWithCapacity:dictArray.count];
36         for (NSDictionary *dict in dictArray) {
37             // 创建模型
38             NJWeibo *weibo = [NJWeibo weiboWithDict:dict];
39             // 根据模型数据创建frame模型
40             NJWeiboFrame *wbF = [[NJWeiboFrame alloc] init];
41             wbF.weibo = weibo;
42             
43             [models addObject:wbF];
44         }
45         self.statusFrames = [models copy];
46     }
47     return _statusFrames;
48 }
49 
50 #pragma mark - 代理方法
51 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
52 {
53     // NSLog(@"heightForRowAtIndexPath");
54     // 取出对应航的frame模型
55     NJWeiboFrame *wbF = self.statusFrames[indexPath.row];
56     NSLog(@"height = %f", wbF.cellHeight);
57     return wbF.cellHeight;
58 }
59 
60 - (BOOL) prefersStatusBarHidden
61 {
62     return YES;
63 }
64 @end