[课堂实践与项目]手机QQ客户端－－5期：好友列表设计初步-segmentControl控制两个View的变化-优快云博客

本文详细介绍了如何在iOS应用中实现分组与全部好友的交换功能，包括ViewController的初始化、交换视图的方法实现及关键事件响应。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

基本的exchange已经实现。但是分组和全部交换的时候出现了bug。

1.先看看效果

2.下面重点是两个View的交换

1）h文件

#import <UIKit/UIKit.h>

@interface LCNewFriendsViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
    
    NSMutableArray *friendsData;
}
@property (strong,nonatomic)UITableView *friendsTableView;


@property (strong,nonatomic)UISegmentedControl *segmentControl;

@property (strong,nonatomic)UIView *groupView;  //分组 view

@property (strong,nonatomic)UIView *allView;  //所有好友的view



@end

2）m文件的初始化

#import "LCNewFriendsViewController.h"


#define EXPANDED @"expanded"
@interface LCNewFriendsViewController ()
{
    int key ;  // 默认1  分组 ，全部 2
}
@end

@implementation LCNewFriendsViewController

- (void)viewWillAppear:(BOOL)animated
{
    key = 1;  //设置key，以便于在cell绘制的时候进行区别绘制
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        
        
        NSArray *segmentArray = [NSArray arrayWithObjects:@"分组",@"全部", nil];
        self.segmentControl = [[UISegmentedControl alloc]initWithItems:segmentArray];
        
        [self.segmentControl addTarget:self action:@selector(segmentValueChanged:) forControlEvents:UIControlEventValueChanged];
        
        
        
        self.navigationItem.titleView = self.segmentControl;
        
        UIBarButtonItem *leftButton = [[UIBarButtonItem alloc]initWithTitle:@"编辑" style:UIBarButtonItemStylePlain target:self action:@selector(editFreinds:)];
        
        self.navigationItem.leftBarButtonItem = leftButton;
        
        UIBarButtonItem *rightButton = [[UIBarButtonItem alloc]initWithTitle:@"添加" style:UIBarButtonItemStylePlain target:self action:@selector(addFriends:)];
        
        self.navigationItem.rightBarButtonItem = rightButton;
        
       
        // Custom initialization
    }
    return self;
}

- (void)editFreinds:(id)sender
{
    

}

- (void)addFriends:(id)sender
{

}

3）关于m文件的exchangeView的实现methods

//全部/分组页面的切换
- (void)segmentValueChanged:(id)sender
{
    
    if (self.segmentControl.selectedSegmentIndex == 0) {
        
        [self enterGroupingView];
    }else
    {
        [self enterallView];
    }
    
}

- (void)enterGroupingView
{
    
    key = 1;
    if (self.groupView == nil) {  //判断当前view‘是不是 groupView
        
        self.groupView = [[UIView alloc]initWithFrame:CGRectMake(0, 30, 320, 425)];
        
        [self.groupView setBackgroundColor:[UIColor redColor]];
        self.friendsTableView = [[UITableView alloc]initWithFrame:self.groupView.frame style:UITableViewStylePlain];
        self.friendsTableView.delegate = self;
        self.friendsTableView.dataSource = self;
       
        [self.groupView addSubview:self.friendsTableView];
        [self.view addSubview:self.groupView];
        
    }else
    {
        [self.view sendSubviewToBack:self.allView];
        [self.view bringSubviewToFront:self.groupView];
    }
    
    
 

}

- (void)enterallView
{
     
      key = 2;
     if (self.allView == nil) {
        self.allView = [[UIView alloc]initWithFrame:CGRectMake(0, 13, 320, 425)];
        [self.allView setBackgroundColor:[UIColor yellowColor]];
        self.friendsTableView = [[UITableView alloc]initWithFrame:self.allView.frame style:UITableViewStylePlain];
        self.friendsTableView.delegate = self;
        self.friendsTableView.dataSource = self;
        [self.allView addSubview:self.friendsTableView];
        [self.view addSubview:self.allView];
        
    }else
    {
        [self.view sendSubviewToBack:self.groupView];
        [self.view bringSubviewToFront:self.allView];
    }
    
    

}

这是前期的实现。后面将实现两个exchange的正常显示和zone，setup的实现