ios 以编程方式创建 UITableView

Creating a UITableView Programmatically

提问by jac300

I have an application in Xcode 4.6 which uses storyboards. I added a UITableView to a view controller class, which worked as expected. However, when I tried deleting the UITableView in the storyboard and adding it back into the same class programmatically, I ran into two specific problems:

我在 Xcode 4.6 中有一个使用故事板的应用程序。我向视图控制器类添加了一个 UITableView，它按预期工作。但是，当我尝试删除故事板中的 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) Although I set the UITableViewCell type to be of type subtitle, the detail label no longer appears.

1）虽然我将 UITableViewCell 类型设置为子标题类型，但不再出现详细信息标签。

2) The segue that should occur when I select a cell does not occur, and prepare segue is not even being called, indicating that no message is being sent to the table view when a cell is selected.

2）当我选择一个单元格时应该发生的segue没有发生，甚至没有调用prepare segue，表明当我选择一个单元格时没有消息发送到表格视图。

Here is the relevant code:

这是相关的代码：

@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....
     }
}

I am not sure what I am forgetting to do so that I can solve these two issues. Any help is appreciated.

我不确定我忘记做什么才能解决这两个问题。任何帮助表示赞赏。

回答by rdelmar

When you register a class, and use dequeueReusableCellWithIdentifier:forIndexPath:, the dequeue method is guaranteed to return a cell, so your if (cell == nil) clause is never entered. So, just do it the old way, don't register the class, and use dequeueReusableCellWithIdentifier:

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，就用老办法，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;
}

As for the segue, it can't be called because you can't make a segue to a table that you've created in code, not in IB. Again, go back to the old way and use tableView:didSelectRowAtIndexPath: which will be called when you select a cell. Instantiate your detail controller there and do the trasition in code.

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，回到旧方式并使用 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。

After edit:

编辑后：

I didn't see your added code there. You've implemented didDeselectRowAtIndexPath rather than didSelectRowAtIndexPath. If you change that, your segue should work.

我在那里没有看到您添加的代码。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。

回答by Sumit singh

You might be do that its works 100% .

你可能会做到它的工作 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

回答by iOS Lifee

- (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;
}

回答by Parv

- (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;
}

回答by Ashwin Felix

Creating a tableview using tableViewController .

使用 tableViewController 创建一个 tableview。

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).")
    }
}

回答by sasidharan.M

sample table

样品表

 #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 Datasource

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

。H

#import <UIKit/UIKit.h>

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

 @end

回答by sasidharan.M

vc.m

vc.m

#import "ViewController.h"

import "secondViewController.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

vc.m

 #import <UIKit/UIKit.h>

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

@end

sv.m

标准差

 #import <UIKit/UIKit.h>

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

sv.h

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.
}

回答by soorej babu

- (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.
}

these are UITableView delegate methods.

这些是 UITableView 委托方法。

回答by Acharya Ronak

#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;
}