IOS学习实例之三---QQ列表

今天跟着极客学院的视频做了QQ列表。

在这个例子中，学习到了一些新的知识点。如：二级控制器等

样例图片：

列表可以展开，点击好友可以跳到另一个页面

本实例没有使用xib或者storyboard。而是采用纯代码的方式添加view，进行界面布局，背景调整。

实现步骤如下：

1. 模型搭建

1）本例采用MVC的结构，首先添加三个文件夹，然后将其拖入项目，copy成为group。

就是黄色文件夹。

2）添加GroupModel.h和.m文件，实现组的模型

3）添加Friends.h和.m文件，实现好友模型

2. 实现UITableView

1) 设置二级控制器和主window

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// Override point for customization after application launch.self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];self.window.backgroundColor = [UIColor whiteColor];ListTableViewController *listVC = [[ListTableViewController alloc] init];//二级控制器UINavigationController *navCtrl = [[UINavigationController alloc] initWithRootViewController:listVC];self.window.rootViewController = navCtrl;//set it is a main window[self.window makeKeyAndVisible];return YES;
}

通过懒加载的方式绑定数据到ListTableViewController

3) 设置section数目，设置section内行数

4）创建Cell，并绑定数据到cell上，需要使用标示符

3. 自定义头视图

1）创建HeaderView.h和.m文件，继承自UITableViewHeaderFooterView

2）在实现文件中创建并初始化header

+ (instancetype)headerView:(UITableView *)tableView{static NSString *identifier = @"header";HeaderView *header = [tableView dequeueReusableCellWithIdentifier:identifier];if(!header){header = [[HeaderView alloc] initWithReuseIdentifier:identifier];}return header;
}- (instancetype)initWithReuseIdentifier:(NSString *)reuseIdentifier{if (self = [super init]) {UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];[button setBackgroundImage:[UIImage imageNamed:@"header_bg"] forState:UIControlStateNormal];[button setBackgroundImage:[UIImage imageNamed:@"header_bg_highlighted"] forState:UIControlStateHighlighted];[button setImage:[UIImage imageNamed:@"arrow"] forState:UIControlStateNormal];[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];button.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;button.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);[button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];button.imageView.clipsToBounds = NO;_arrowBtn = button;[self addSubview:_arrowBtn];//create label, display current people numberUILabel *labelRight = [[UILabel alloc] init];labelRight.textAlignment = NSTextAlignmentCenter;_label = labelRight;[self addSubview:_label];}return self;
}

- (void)setGroupModel:(GroupModel *)groupModel{_groupModel = groupModel;[_arrowBtn setTitle:_groupModel.name forState:UIControlStateNormal];_label.text = [NSString stringWithFormat:@"%@/%lu", _groupModel.online, (unsigned long)_groupModel.friends.count];}

//layout:set the frame value of button and frame
- (void)layoutSubviews{[super layoutSubviews];_arrowBtn.frame = self.bounds;_label.frame = CGRectMake(self.frame.size.width - 70, 0, 60, self.frame.size.height);
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{HeaderView *header = [HeaderView headerView:tableView];header.delegate = self;header.groupModel = self.dataArray[section];return header;}

#import 
#import "GroupModel.h"// for the click
@protocol HeaderViewDelegate @optional
- (void)clickView;@end@interface HeaderView : UITableViewHeaderFooterView@property (nonatomic, assign) id delegate;
@property (nonatomic, strong) GroupModel *groupModel;+ (instancetype)headerView:(UITableView *)tableView;@end

- (void)buttonAction{self.groupModel.isOpen = !self.groupModel.isOpen;if ([self.delegate respondsToSelector:@selector(clickView)]) {[self.delegate clickView];}
}

- (void)clickView{[self.tableView reloadData];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ViewController *viewCtrl = [[ViewController alloc] init];viewCtrl.view.backgroundColor = [UIColor grayColor];[self.navigationController pushViewController:viewCtrl animated:NO];}

5. 去除底线

- (void)clipExtraCellLine:(UITableView *)tableView{UIView *view = [[UIView alloc] init];view.backgroundColor = [UIColor clearColor];[self.tableView setTableFooterView:view];
}

- (void)didMoveToSuperview{_arrowBtn.imageView.transform = self.groupModel.isOpen ?CGAffineTransformMakeRotation(M_PI_2) :CGAffineTransformMakeRotation(0);
}

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