iOS-UI-QQ好友界面实现

一.项目前准备

1.pch文件如下

//  Prefix header
//
//  The contents of this file are implicitly included at the beginning of every source file.
//

#import 

#ifndef __IPHONE_5_0
#warning "This project uses features only available in iOS SDK 5.0 and later."
#endif

#ifdef __OBJC__
    #import 
    #import 
#endif

2.friends.plist文件如下

3.根控制器设置为MJTableViewController

二.使用MVC开发模式

1.模型文件分别是朋友模型和组模型

①.朋友模型:

//  MJFriend.h

#import 

@interface MJFriend : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *icon;
@property (nonatomic, copy) NSString *intro;
@property (nonatomic, assign, getter = isVip) BOOL vip;

+ (instancetype)friendWithDict:(NSDictionary *)dict;
- (instancetype)initWithDict:(NSDictionary *)dict;
@end

//  MJFriend.m

#import "MJFriend.h"

@implementation MJFriend
+ (instancetype)friendWithDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

- (instancetype)initWithDict:(NSDictionary *)dict
{
    if (self = [super init]) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}
@end

②.组模型:

//  MJFriendGroup.h

#import 

@interface MJFriendGroup : NSObject
@property (nonatomic, copy) NSString *name;
/**
 *  数组中装的都是MJFriend模型
 */
@property (nonatomic, strong) NSArray *friends;
@property (nonatomic, assign) int online;

/**
 *  标识这组是否需要展开,  YES : 展开 ,  NO : 关闭
 */
@property (nonatomic, assign, getter = isOpened) BOOL opened;

+ (instancetype)groupWithDict:(NSDictionary *)dict;
- (instancetype)initWithDict:(NSDictionary *)dict;
@end

//  MJFriendGroup.m

#import "MJFriendGroup.h"
#import "MJFriend.h"

@implementation MJFriendGroup
+ (instancetype)groupWithDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

//将friends的数据存起来
- (instancetype)initWithDict:(NSDictionary *)dict
{
    if (self = [super init]) {
        // 1.注入所有属性
        [self setValuesForKeysWithDictionary:dict];
        
        // 2.特殊处理friends属性
        NSMutableArray *friendArray = [NSMutableArray array];
        for (NSDictionary *dict in self.friends) {
            MJFriend *friend = [MJFriend friendWithDict:dict];
            [friendArray addObject:friend];
        }
        self.friends = friendArray;
    }
    return self;
}
@end

2.View文件代码:

①.cell代码

//  MJFriendCell.h

#import 
@class MJFriend;

@interface MJFriendCell : UITableViewCell
+ (instancetype)cellWithTableView:(UITableView *)tableView;
// friend是C++的关键字,不能用friend作为属性名
@property (nonatomic, strong) MJFriend *friendData;
@end

//  MJFriendCell.m

#import "MJFriendCell.h"
#import "MJFriend.h"

@implementation MJFriendCell

+ (instancetype)cellWithTableView:(UITableView *)tableView
{
    static NSString *ID = @"friend";
    MJFriendCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[MJFriendCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }
    return cell;
}

- (void)setFriendData:(MJFriend *)friendData
{
    _friendData = friendData;
    
    self.imageView.image = [UIImage imageNamed:friendData.icon];
    self.textLabel.text = friendData.name;
    self.textLabel.textColor = friendData.isVip ? [UIColor redColor] : [UIColor blackColor];
    self.detailTextLabel.text = friendData.intro;
}
@end

②.组视图代码

//  MJHeaderView.h

#import 

@class MJFriendGroup, MJHeaderView;

//点击了头视图,传递给控制器
@protocol MJHeaderViewDelegate 
@optional
- (void)headerViewDidClickedNameView:(MJHeaderView *)headerView;
@end


@interface MJHeaderView : UITableViewHeaderFooterView

+ (instancetype)headerViewWithTableView:(UITableView *)tableView;


@property (nonatomic, strong) MJFriendGroup *group;
@property (nonatomic, weak) id delegate;

@end

//  MJHeaderView.m

#import "MJHeaderView.h"
#import "MJFriendGroup.h"

/**
 某个控件出不来:
 1.frame的尺寸和位置对不对
 
 2.hidden是否为YES
 
 3.有没有添加到父控件中
 
 4.alpha 是否 < 0.01
 
 5.被其他控件挡住了
 
 6.父控件的前面5个情况
 */

@interface MJHeaderView()
@property (nonatomic, weak) UILabel *countView;
@property (nonatomic, weak) UIButton *nameView;
@end

@implementation MJHeaderView

+ (instancetype)headerViewWithTableView:(UITableView *)tableView
{
    static NSString *ID = @"header";
    MJHeaderView *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:ID];
    if (header == nil) {
        header = [[MJHeaderView alloc] initWithReuseIdentifier:ID];
    }
    return header;
}

/**
 *  在这个初始化方法中,MJHeaderView的frame\bounds没有值
 */
- (id)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithReuseIdentifier:reuseIdentifier]) {
        // 添加子控件
        // 1.添加按钮
        UIButton *nameView = [UIButton buttonWithType:UIButtonTypeCustom];
        // 背景图片
        [nameView setBackgroundImage:[UIImage imageNamed:@"buddy_header_bg"] forState:UIControlStateNormal];
        [nameView setBackgroundImage:[UIImage imageNamed:@"buddy_header_bg_highlighted"] forState:UIControlStateHighlighted];
        // 设置按钮内部的左边箭头图片
        [nameView setImage:[UIImage imageNamed:@"buddy_header_arrow"] forState:UIControlStateNormal];
        [nameView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        // 设置按钮的内容左对齐
        nameView.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        // 设置按钮的内边距
//        nameView.imageEdgeInsets
        nameView.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
        nameView.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
        [nameView addTarget:self action:@selector(nameViewClick) forControlEvents:UIControlEventTouchUpInside];
        
        // 设置按钮内部的imageView的内容模式为居中
        nameView.imageView.contentMode = UIViewContentModeCenter;
        // 超出边框的内容不需要裁剪
        nameView.imageView.clipsToBounds = NO;
        
        [self.contentView addSubview:nameView];
        self.nameView = nameView;
        
        // 2.添加好友数
        UILabel *countView = [[UILabel alloc] init];
        countView.textAlignment = NSTextAlignmentRight;
        countView.textColor = [UIColor grayColor];
        [self.contentView addSubview:countView];
        self.countView = countView;
    }
    return self;
}

/**
 *  当一个控件的frame发生改变的时候就会调用
 *
 *  一般在这里布局内部的子控件(设置子控件的frame)
 */
- (void)layoutSubviews
{
#warning 一定要调用super的方法
    [super layoutSubviews];
    
    // 1.设置按钮的frame
    self.nameView.frame = self.bounds;
    
    // 2.设置好友数的frame
    CGFloat countY = 0;
    CGFloat countH = self.frame.size.height;
    CGFloat countW = 150;
    CGFloat countX = self.frame.size.width - 10 - countW;
    self.countView.frame = CGRectMake(countX, countY, countW, countH);
}

- (void)setGroup:(MJFriendGroup *)group
{
    _group = group;
    
    // 1.设置按钮文字(组名)
    [self.nameView setTitle:group.name forState:UIControlStateNormal];
    
    // 2.设置好友数(在线数/总数)
    self.countView.text = [NSString stringWithFormat:@"%d/%d", group.online, group.friends.count];
}

/**
 *  监听组名按钮的点击
 */
- (void)nameViewClick
{
    // 1.修改组模型的标记(状态取反)
    self.group.opened = !self.group.isOpened;
    
    // 2.刷新表格  点击那个头视图就把谁传过去
    if ([self.delegate respondsToSelector:@selector(headerViewDidClickedNameView:)]) {
        [self.delegate headerViewDidClickedNameView:self];
    }
}

/**
 *  当一个控件被添加到父控件中就会调用,如果把这个方法里面的代码写在nameViewClick里面,这样点击按钮的时候控制器就会刷新cell,就会从缓存池里面取出新的headview,这样我们的旋转就没用了,所以我们把旋转的处理写在这个方法里面
 */
- (void)didMoveToSuperview
{
    if (self.group.opened) {
        self.nameView.imageView.transform = CGAffineTransformMakeRotation(M_PI_2);
    } else {
        self.nameView.imageView.transform = CGAffineTransformMakeRotation(0);
    }
}

/**
 *  当一个控件即将被添加到父控件中会调用
 */
//- (void)willMoveToSuperview:(UIView *)newSuperview
//{
//    
//}
@end

3.控制器文件如下

.h文件

//  MJViewController.h

#import 

@interface MJViewController : UITableViewController

@end

.m文件

//  MJViewController.m

#import "MJViewController.h"
#import "MJFriendGroup.h"
#import "MJFriend.h"
#import "MJHeaderView.h"
#import "MJFriendCell.h"

@interface MJViewController () 
@property (nonatomic, strong) NSArray *groups;
@end

@implementation MJViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 每一行cell的高度
    self.tableView.rowHeight = 50;
    // 每一组头部控件的高度
    self.tableView.sectionHeaderHeight = 44;
}

- (NSArray *)groups
{
    if (_groups == nil) {
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"friends.plist" ofType:nil]];
        
        NSMutableArray *groupArray = [NSMutableArray array];
        for (NSDictionary *dict in dictArray) {
            MJFriendGroup *group = [MJFriendGroup groupWithDict:dict];
            [groupArray addObject:group];
        }
        
        _groups = groupArray;
    }
    return _groups;
}

- (BOOL)prefersStatusBarHidden
{
    return YES;
}

#pragma mark - 数据源方法
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.groups.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    MJFriendGroup *group = self.groups[section];
    
    return (group.isOpened ? group.friends.count : 0);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // 1.创建cell
    MJFriendCell *cell = [MJFriendCell cellWithTableView:tableView];
    
    // 2.设置cell的数据
    MJFriendGroup *group = self.groups[indexPath.section];
    cell.friendData = group.friends[indexPath.row];
    
    return cell;
}

/**
 *  返回每一组需要显示的头部标题(字符出纳)
 */
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    // 1.创建头部控件
    MJHeaderView *header = [MJHeaderView headerViewWithTableView:tableView];
    header.delegate = self;
    
    // 2.给header设置数据(给header传递模型)
    header.group = self.groups[section];
    
    return header;
}

#pragma mark - headerView的代理方法
/**
 *  点击了headerView上面的名字按钮时就会调用, 重新刷新cell
 */
- (void)headerViewDidClickedNameView:(MJHeaderView *)headerView
{
    [self.tableView reloadData];
}
@end