1 //  Created by 鑫 on 14-10-13.2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.3 //4 5 #import <UIKit/UIKit.h>6 7 @interface TXViewController : UITableViewController8 9 @end

 1 //  Created by 鑫 on 14-10-13. 2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved. 3 // 4  5 #import <Foundation/Foundation.h> 6  7 @interface TXFriendGroup : NSObject 8 @property (nonatomic, copy) NSString *name; 9 /**10  *  数组中装的都是TXFriend模型11  */12 @property (nonatomic, strong) NSArray *friends;13 @property (nonatomic, assign) int online;14 15 + (instancetype)groupWithDict:(NSDictionary *)dict;16 - (instancetype)initWithDict:(NSDictionary *)dict;17 18 19 @end

 1 #import "TXFriendGroup.h" 2 #import "TXFriend.h" 3 @implementation TXFriendGroup 4 + (instancetype)groupWithDict:(NSDictionary *)dict 5 { 6     return [[self alloc] initWithDict:dict]; 7 } 8  9 - (instancetype)initWithDict:(NSDictionary *)dict10 {11     if (self = [super init]) {12         // 1.注入所有属性将字典转换为模型13         [self setValuesForKeysWithDictionary:dict];14         15         // 2.特殊处理friends属性定义一个数组来保存转换后的模型16         NSMutableArray *friendArray = [NSMutableArray array];17         for (NSDictionary *dict in self.friends) {18             TXFriend *friend = [TXFriend friendWithDict:dict];19             [friendArray addObject:friend];20         }21         self.friends = friendArray;22     }23     return self;24 }25 26 @end

 1 #import <Foundation/Foundation.h> 2  3 @interface TXFriend : NSObject 4 @property (nonatomic, copy) NSString *name; 5 @property (nonatomic, copy) NSString *icon; 6 @property (nonatomic, copy) NSString *intro; 7 @property (nonatomic, assign, getter = isVip) BOOL vip; 8  9 + (instancetype)friendWithDict:(NSDictionary *)dict;10 - (instancetype)initWithDict:(NSDictionary *)dict;11 12 @end

 1 #import "TXFriend.h" 2  3 @implementation TXFriend 4 + (instancetype)friendWithDict:(NSDictionary *)dict 5 { 6     return [[self alloc] initWithDict:dict]; 7 } 8  9 - (instancetype)initWithDict:(NSDictionary *)dict10 {11     if (self = [super init]) {12         [self setValuesForKeysWithDictionary:dict];13     }14     return self;15 }16 17 @end

 1 / 2 //  TXFriendCell.h 3 //  04-QQ好友列表 4 // 5 //  Created by 鑫 on 14-10-14. 6 //  Copyright (c) 2014年 梁镋鑫. All rights reserved. 7 // 8  9 #import <UIKit/UIKit.h>10 @class TXFriend;11 @interface TXFriendCell : UITableViewCell12 + (instancetype)cellWithTableView:(UITableView *)tableView;13 // friend是C++的关键字,不能用friend作为属性名14 @property (nonatomic, strong) TXFriend *friendData;15 @end

 1 #import "TXFriendCell.h" 2 #import "TXFriend.h" 3 @implementation TXFriendCell 4  5 + (instancetype)cellWithTableView:(UITableView *)tableView 6 { 7     static NSString *ID = @"friend"; 8     TXFriendCell *cell = [tableView dequeueReusableCellWithIdentifier:ID]; 9     if (cell == nil) {10         //这里使用系统自带的样式11         cell = [[TXFriendCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];12     }13     return cell;14 }15 16 - (void)setFriendData:(TXFriend *)friendData17 {18     _friendData =http://www.mamicode.com/ friendData;19     20     self.imageView.image = [UIImage imageNamed:friendData.icon];21     self.textLabel.text = friendData.name;22     self.detailTextLabel.text = friendData.intro;23 }24 25 @end

 1 // 2 //  Created by 鑫 on 14-10-14. 3 //  Copyright (c) 2014年 梁镋鑫. All rights reserved. 4 // 5  6 #import <UIKit/UIKit.h> 7 @class TXFriendGroup; 8 @interface TXHeaderView : UITableViewHeaderFooterView 9 + (instancetype)headerViewWithTableView:(UITableView *)tableView;10 11 @property (nonatomic, strong) TXFriendGroup *group;12 13 14 @end

  1 #import "TXFriendGroup.h"  2   3 #import "TXHeaderView.h"  4 /**  5  某个控件出不来:  6  1.frame的尺寸和位置对不对  7    8  2.hidden是否为YES  9   10  3.有没有添加到父控件中 11   12  4.alpha 是否 < 0.01 13   14  5.被其他控件挡住了 15   16  6.父控件的前面5个情况 17  */ 18  19 @interface TXHeaderView() 20 @property (nonatomic, weak) UILabel *countView; 21 @property (nonatomic, weak) UIButton *nameView; 22 @end 23  24 @implementation TXHeaderView 25  26 + (instancetype)headerViewWithTableView:(UITableView *)tableView 27 { 28     static NSString *ID = @"header"; 29     TXHeaderView *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:ID]; 30     if (header == nil) { 31         header = [[TXHeaderView alloc] initWithReuseIdentifier:ID]; 32     } 33     return header; 34 } 35  36 /** 37  *  在这个初始化方法中,TXHeaderView的frame\bounds没有值 38  */ 39 - (id)initWithReuseIdentifier:(NSString *)reuseIdentifier 40 { 41     if (self = [super initWithReuseIdentifier:reuseIdentifier]) { 42         // 添加子控件 43         // 1.添加按钮 44         UIButton *nameView = [UIButton buttonWithType:UIButtonTypeCustom]; 45         // 背景图片 46         [nameView setBackgroundImage:[UIImage imageNamed:@"buddy_header_bg"] forState:UIControlStateNormal]; 47         [nameView setBackgroundImage:[UIImage imageNamed:@"buddy_header_bg_highlighted"] forState:UIControlStateHighlighted]; 48         // 设置按钮内部的左边箭头图片 49         [nameView setImage:[UIImage imageNamed:@"buddy_header_arrow"] forState:UIControlStateNormal]; 50         [nameView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 51         // 设置按钮的内容左对齐 52         nameView.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft; 53         // 设置按钮的内边距 54         //        nameView.imageEdgeInsets 55         nameView.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0); 56         nameView.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0); 57         [self.contentView addSubview:nameView]; 58         self.nameView = nameView; 59          60         // 2.添加好友数 61         UILabel *countView = [[UILabel alloc] init]; 62         countView.textAlignment = NSTextAlignmentRight; 63         countView.textColor = [UIColor grayColor]; 64         [self.contentView addSubview:countView]; 65         self.countView = countView; 66     } 67     return self; 68 } 69  70 /** 71  *  当一个控件的frame发生改变的时候就会调用 72  * 73  *  一般在这里布局内部的子控件(设置子控件的frame) 74  */ 75 - (void)layoutSubviews 76 { 77 #warning 一定要调用super的方法 78     [super layoutSubviews]; 79      80     // 1.设置按钮的frame 81     self.nameView.frame = self.bounds; 82      83     // 2.设置好友数的frame 84     CGFloat countY = 0; 85     CGFloat countH = self.frame.size.height; 86     CGFloat countW = 150; 87     CGFloat countX = self.frame.size.width - 10 - countW; 88     self.countView.frame = CGRectMake(countX, countY, countW, countH); 89 } 90  91 - (void)setGroup:(TXFriendGroup *)group 92 { 93     _group = group; 94      95     // 1.设置按钮文字(组名) 96     [self.nameView setTitle:group.name forState:UIControlStateNormal]; 97      98     // 2.设置好友数(在线数/总数) 99     self.countView.text = [NSString stringWithFormat:@"%d/%d", group.online, group.friends.count];100 }101 102 @end

 1 #import "TXViewController.h" 2 #import "TXFriendGroup.h" 3 #import "TXFriend.h" 4 #import "TXHeaderView.h" 5 #import "TXFriendCell.h" 6  7 @interface TXViewController () 8 @property (nonatomic, strong) NSArray *groups; 9 @end10 11 @implementation TXViewController12 13 - (void)viewDidLoad14 {15     [super viewDidLoad];16     17     // 每一行cell的高度18     self.tableView.rowHeight = 50;19     // 每一组头部控件的高度20     self.tableView.sectionHeaderHeight = 44;21 }22 //1.先拿到数据，实现懒加载23 - (NSArray *)groups24 {25     if (_groups == nil) {26         NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"friends.plist" ofType:nil]];27         28         NSMutableArray *groupArray = [NSMutableArray array];29         for (NSDictionary *dict in dictArray) {30             TXFriendGroup *group = [TXFriendGroup groupWithDict:dict];31             [groupArray addObject:group];32         }33         34         _groups = groupArray;35     }36     return _groups;37 }38 39 - (BOOL)prefersStatusBarHidden40 {41     return YES;42 }43 44 #pragma mark - 数据源方法45 //返回多少组46 //为什么这里不会智能提示？因为这些方法是uitableview协议里的，默认并没有遵守协议，让主控制器类继承uitableviewcontroller后，就已经遵守了47 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView48 {49     return self.groups.count;50 }51 //每组每行的内容52 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section53 {54     TXFriendGroup *group = self.groups[section];55     return group.friends.count;56 }57 58 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath59 {60     // 1.创建cell61     TXFriendCell *cell = [TXFriendCell cellWithTableView:tableView];62     63     // 2.设置cell的数据64     TXFriendGroup *group = self.groups[indexPath.section];65     cell.friendData =http://www.mamicode.com/ group.friends[indexPath.row];66     67     return cell;68 }69 70 /**71  *  返回每一组需要显示的头部标题(字符出纳)// 当一个分组标题进入视野的时候就会调用该方法72  */73 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section74 {75     // 1.创建头部控件76     TXHeaderView *header = [TXHeaderView headerViewWithTableView:tableView];77     78     // 2.给header设置数据(给header传递模型)79     header.group = self.groups[section];80     81     return header;82 }83 //设置分组头部标题的高度84 -(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section85 {86     return 44;87 }88 @end