以编程方式创建 UITableView

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【中文标题】以编程方式创建 UITableView【英文标题】:Creating a UITableView Programmatically 【发布时间】:2013-03-28 14:56:54 【问题描述】:

我在 Xcode 4.6 中有一个使用情节提要的应用程序。我向视图控制器类添加了一个 UITableView,它按预期工作。但是,当我尝试删除情节提要中的 UITableView 并以编程方式将其添加回同一个类时,我遇到了两个具体问题:

1)虽然我将 UITableViewCell 类型设置为 subtitle 类型,但是细节标签不再出现。

2)我选择单元格时应该发生的segue没有发生,甚至没有调用prepare segue,表明选择单元格时没有向表格视图发送消息。强>

以下是相关代码:

@interface StatsTableViewController () <UITableViewDataSource, UITableViewDelegate>
@property (strong, nonatomic) UITableView *tableView;

@end

@implementation StatsTableViewController

-(UITableView *)makeTableView

    CGFloat x = 0;
    CGFloat y = 50;
    CGFloat width = self.view.frame.size.width;
    CGFloat height = self.view.frame.size.height - 50;
    CGRect tableFrame = CGRectMake(x, y, width, height);

    UITableView *tableView = [[UITableView alloc]initWithFrame:tableFrame style:UITableViewStylePlain];

    tableView.rowHeight = 45;
    tableView.sectionFooterHeight = 22;
    tableView.sectionHeaderHeight = 22;
    tableView.scrollEnabled = YES;
    tableView.showsVerticalScrollIndicator = YES;
    tableView.userInteractionEnabled = YES;
    tableView.bounces = YES;

    tableView.delegate = self;
    tableView.dataSource = self;

    return tableView;


- (void)viewDidLoad

    [super viewDidLoad];
    self.tableView = [self makeTableView];
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"newFriendCell"];
    [self.view addSubview:self.tableView];


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *CellIdentifier = @"newFriendCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if (cell == nil) 
    
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    

    Friend *friend = [self.fetchedResultsController objectAtIndexPath:indexPath];

     **//THIS DATA APPEARS**
    cell.textLabel.text = friend.name;
    cell.textLabel.font = [cell.textLabel.font fontWithSize:20];
    cell.imageView.image = [UIImage imageNamed:@"icon57x57"];

    **//THIS DATA DOES NOT APPEAR**
    cell.detailTextLabel.text = [NSString stringWithFormat:@"%i Games", friend.gameCount];
    cell.detailTextLabel.textColor = [UIColor lightGrayColor];

    return cell;


 -(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath

    [self performSegueWithIdentifier:@"detailsView" sender:self];


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

      //I set the segue identifier in the interface builder
     if ([segue.identifier isEqualToString:@"detailsView"])
     

         NSLog(@"segue"); //check to see if method is called, it is NOT called upon cell touch

         NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
         ///more code to prepare next view controller....
     

我不确定自己忘记做什么才能解决这两个问题。任何帮助表示赞赏。

【问题讨论】:

尝试定义单元格的高度。 行高不是单元格的高度吗?我把它设置为 45,这应该是足够的空间...... 哦,可以,我认为你定义了一个错误的方法 didDeselect 而应该是 didSelect。 【参考方案1】:

当您注册一个类并使用 dequeueReusableCellWithIdentifier:forIndexPath: 时,dequeue 方法保证返回一个单元格,因此永远不会输入您的 if (cell == nil) 子句。所以,就照旧做,不要注册类,使用dequeueReusableCellWithIdentifier:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *CellIdentifier = @"newFriendCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) 
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    
//etc.
return cell;

至于转场,它不能被调用,因为你不能对你在代码中创建的表进行转场,而不是在 IB 中。再次,回到旧方法并使用 tableView:didSelectRowAtIndexPath: 当您选择一个单元格时将调用它。在那里实例化您的细节控制器并在代码中进行转换。

修改后:

我没有在那里看到您添加的代码。您已经实现了 didDeselectRowAtIndexPath 而不是 didSelectRowAtIndexPath。如果你改变它,你的 segue 应该可以工作。

【讨论】:

我认为如果你的故事板中存在 segue,你可以使用它,但你仍然需要实现 tableView:didSelectRowAtIndexPath: 并以编程方式执行 segue,这违背了目的。 @tapi,是的,我知道,我没有看到她的一些代码,并认为 OP 试图直接从单元格中进行转场。 我刚刚尝试添加 tableView:didSelectRowAtIndexPath: 并在正文中 performSegueWithIdentifier... 但这不起作用。我想我会尝试在代码中进行转换 @user1697845,它应该可以工作——你确定你在 IB 和代码中的 segue 名称相同吗? @user1697845,为什么当您在 IB 中拥有表格视图时,您将其删除并在代码中重做?只是好奇。【参考方案2】:

你可能会做到 100% 。

- (void)viewDidLoad

    [super viewDidLoad];
    // init table view
    tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];

    // must set delegate & dataSource, otherwise the the table will be empty and not responsive
    tableView.delegate = self;
    tableView.dataSource = self;

    tableView.backgroundColor = [UIColor cyanColor];

    // add to canvas
    [self.view addSubview:tableView];


#pragma mark - UITableViewDataSource
// number of section(s), now I assume there is only 1 section
- (NSInteger)numberOfSectionsInTableView:(UITableView *)theTableView

    return 1;


// number of row in the section, I assume there is only 1 row
- (NSInteger)tableView:(UITableView *)theTableView numberOfRowsInSection:(NSInteger)section

    return 1;


// the cell will be returned to the tableView
- (UITableViewCell *)tableView:(UITableView *)theTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *cellIdentifier = @"HistoryCell";

    // Similar to UITableViewCell, but 
    JSCustomCell *cell = (JSCustomCell *)[theTableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil) 
        cell = [[JSCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    
    // Just want to test, so I hardcode the data
    cell.descriptionLabel.text = @"Testing";

    return cell;


#pragma mark - UITableViewDelegate
// when user tap the row, what action you want to perform
- (void)tableView:(UITableView *)theTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    NSLog(@"selected %d row", indexPath.row);


@end

【讨论】:

【参考方案3】:
- (void)viewDidLoad 
     [super viewDidLoad];
     arr=[[NSArray alloc]initWithObjects:@"ABC",@"XYZ", nil];
     tableview = [[UITableView alloc]initWithFrame:tableFrame style:UITableViewStylePlain];   
     tableview.delegate = self;
     tableview.dataSource = self;
     [self.view addSubview:tableview];


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

    return arr.count;


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyCell"];

    if(cell == nil)
    
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"MyCell"];
    

    cell.textLabel.text=[arr objectAtIndex:indexPath.row];

    return cell;

【讨论】:

【参考方案4】:
- (void)viewDidLoad

    [super viewDidLoad];
    tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;

    tableView.backgroundColor = [UIColor grayColor];

    // add to superview
    [self.view addSubview:tableView];


#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)theTableView

    return 1;


- (NSInteger)tableView:(UITableView *)theTableView numberOfRowsInSection:    (NSInteger)section

    return 1;


// the cell will be returned to the tableView
- (UITableViewCell *)tableView:(UITableView *)theTableView  cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *cellIdentifier = @"HistoryCell";

    // Similar to UITableViewCell, but 
    UITableViewCell *cell = (UITableViewCell *)[theTableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil)
    
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    
    cell.descriptionLabel.text = @"Testing";
    return cell;

【讨论】:

【参考方案5】:

样本表

 #import "StartreserveViewController.h"
 #import "CollectionViewController.h"
 #import "TableViewCell1.h"
@interface StartreserveViewController ()



NSArray *name;
NSArray *images;
NSInteger selectindex;



@end

@implementation StartreserveViewController

- (void)viewDidLoad 
[super viewDidLoad];
// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColor blueColor];
_startReservetable.backgroundColor = [UIColor blueColor];


name = [[NSArray alloc]initWithObjects:@"Mobiles",@"Costumes",@"Shoes", 
nil];
images = [[NSArray 
 alloc]initWithObjects:@"mobilestitle.jpg",@"costumetitle.jpeg", 
 @"shoestitle.png",nil];



  

 - (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.

pragma mark - UiTableview 数据源

 -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 
return 1;
 

 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:
 (NSInteger)section
 
return 3;
 

 - (UITableViewCell *)tableView:(UITableView *)tableView 
  cellForRowAtIndexPath:(NSIndexPath *)indexPath
 


static NSString *cellId = @"tableview";

TableViewCell1  *cell =[tableView dequeueReusableCellWithIdentifier:cellId];


cell.cellTxt .text = [name objectAtIndex:indexPath.row];

cell.cellImg.image = [UIImage imageNamed:[images 
objectAtIndex:indexPath.row]];

return cell;



 


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:
(NSIndexPath *)indexPath
 
selectindex = indexPath.row;
[self performSegueWithIdentifier:@"second" sender:self];




   #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little     
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 

if ([segue.identifier isEqualToString:@"second"])

  
    CollectionViewController *obj = segue.destinationViewController;
           obj.receivename = [name objectAtIndex:selectindex];

  



// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.


 @end

.h

#import <UIKit/UIKit.h>

@interface StartreserveViewController :      
UIViewController<UITableViewDelegate,UITableViewDataSource>    
@property (strong, nonatomic) IBOutlet UITableView *startReservetable;

 @end

【讨论】:

这与这里已有的 7 个其他答案有何不同?给出答案时,最好给出some explanation as to WHY your answer 是那个。【参考方案6】:

vc.m

#import "ViewController.h"

导入“secondViewController.h”

 @interface ViewController ()
 

NSArray *cityArray;
NSArray *citySubTitleArray;
NSArray *cityImage;
NSInteger selectindexpath;


@end

 @implementation ViewController

 - (void)viewDidLoad 
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

cityArray = [[NSArray 
alloc]initWithObjects:@"Coimbatore",@"Salem",@"Chennai",nil];

citySubTitleArray = [[NSArray alloc]initWithObjects:@"1",@"2",@"3", nil];
cityImage = [[NSArray alloc]initWithObjects:@"12-300x272.png"
 , @"380267_70d232fc33b44d4ebe7b42bbe63ee9be.png",@"apple-logo_318
 -40184.png", nil];

 


 #pragma mark - UITableView Data Source

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 
return 1;

 

 - (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection 
 :(NSInteger)section
  
return cityImage.count;
 

- (UITableViewCell *)tableView:(UITableView *)tableView 
cellForRowAtIndexPath:(NSIndexPath *)indexPath

static NSString *cellId = @"city";

UITableViewCell *cell =
 [tableView dequeueReusableCellWithIdentifier:cellId];

if (cell == nil)

    cell = [[UITableViewCell 
  alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];


cell.textLabel.text = [cityArray objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [citySubTitleArray objectAtIndex:indexPath.row];
cell.imageView.image = [UIImage imageNamed:
 [cityImage objectAtIndex:indexPath.row]];




 //    NSData *data = [[NSData alloc]initWithContentsOfURL:
 [NSURL URLWithString:@""]];

 //    cell.imageView.image = [UIImage imageWithData:data];

return cell;


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath
:  (NSIndexPath *)indexPath
 
 NSLog(@"---- %@",[cityArray objectAtIndex:indexPath.row]);
 NSLog(@"----- %@",[cityImage objectAtIndex:indexPath.row]);
 selectindexpath=indexPath.row;
 [self performSegueWithIdentifier:@"second" sender:self];
  

  #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little p
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
    
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 if ([segue.identifier isEqualToString:@"second"])
 
    secondViewController *object=segue.destinationViewController;
    object.cityName=[cityArray objectAtIndex:selectindexpath];
    object.cityImage=[cityImage objectAtIndex:selectindexpath];
       
 


- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
 

 @end

vc.m

 #import <UIKit/UIKit.h>

 @interface ViewController : UIViewController<UITableViewDataSource
  , UITableViewDelegate>
 @property (strong, nonatomic) IBOutlet UITableView *cityLabelList;

@end

sv.m

 #import <UIKit/UIKit.h>

@interface secondViewController : UIViewController
@property(strong, nonatomic) NSString *cityName;
 @property(strong,nonatomic)NSString *cityImage;
@end

sv.h

#import "secondViewController.h"

 @interface secondViewController ()

 @property (strong, nonatomic) IBOutlet UILabel *lbl_desc;
 @property (strong, nonatomic) IBOutlet UIImageView *img_city;
    @end

 @implementation secondViewController

 - (void)viewDidLoad 
 [super viewDidLoad];
// Do any additional setup after loading the view.
self.title=self.cityName;


if ([self.cityName isEqualToString:@"Coimbatore"])



    self.lbl_desc.text=@"Coimbatore city";
    self.img_city.image=[UIImage imageNamed:
    [NSString stringWithFormat:@"%@",self.cityImage]];

 else if ([self.cityName isEqualToString:@"Chennai"])
 

    self.lbl_desc.text= @"Chennai City Gangstar";
    self.img_city.image=[UIImage imageNamed:
   [NSString stringWithFormat:@"%@",self.cityImage]];

   
  else
   


    self.lbl_desc.text= @"selam City";
    self.img_city.image=[UIImage imageNamed:
   [NSString stringWithFormat:@"%@",self.cityImage]];

   
 

- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.

【讨论】:

【参考方案7】:

使用 tableViewController 创建一个表格视图。

import UIKit

class TableViewController: UITableViewController

    let tableViewModel = TableViewModel()
    var product: [String] = []
    var price: [String] = []
    override func viewDidLoad()
    
        super.viewDidLoad()
        self.tableView.contentInset = UIEdgeInsetsMake( 20, 20 , 0, 0)
        let priceProductDetails = tableViewModel.dataProvider()

        for (key, value) in priceProductDetails
        
            product.append(key)
            price.append(value)
        
    

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    
        return product.count
    

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
    
        let cell = UITableViewCell(style: .Value1, reuseIdentifier: "UITableViewCell")
        cell.textLabel?.text = product[indexPath.row]
        cell.detailTextLabel?.text = price[indexPath.row]
        return cell
    

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
    
        print("You tapped cell number \(indexPath.row).")
    

【讨论】:

【参考方案8】:
- (NSInteger)tableView:(UITableView *)theTableView numberOfRowsInSection:(NSInteger)section

    return 1;


- (UITableViewCell *)tableView:(UITableView *)theTableView  cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *cellIdentifier = @"HistoryCell";

    UITableViewCell *cell = (UITableViewCell *)[theTableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil)
    
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    
    cell.descriptionLabel.text = @"Testing";
    return cell;


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    //Code for selection.

这些是 UITableView 委托方法。

【讨论】:

最好每次都被记住【参考方案9】:
#import "ViewController.h"

@interface ViewController ()



    NSMutableArray *name;



@end


- (void)viewDidLoad 



    [super viewDidLoad];
    name=[[NSMutableArray alloc]init];
    [name addObject:@"ronak"];
    [name addObject:@"vibha"];
    [name addObject:@"shivani"];
    [name addObject:@"nidhi"];
    [name addObject:@"firdosh"];
    [name addObject:@"himani"];

    _tableview_outlet.delegate = self;
    _tableview_outlet.dataSource = self;




- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section



return [name count];




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath



    static NSString *simpleTableIdentifier = @"cell";

    UITableViewCell *cell = [tableView       dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) 
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
    

    cell.textLabel.text = [name objectAtIndex:indexPath.row];
    return cell;

【讨论】:

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