Question

在我的项目中我正在使用自定义UITableView，其中i传递了2个数组（图像和名称）数组显示在UITableView上。现在我希望当我点击表格视图的任何单元格时，UITableViewCell的凭据将显示在下一个视图中，其中我采用UIImageView（用于图像）和UILabel（用于名称显示）。我还导入VC，我必须显示图像和名称。请建议我在另一个视图上显示名称和图像的代码

我正在使用以下代码

.h文件

#import <UIKit/UIKit.h>

@interface FriendsViewController : UIViewController<UISearchDisplayDelegate , UISearchBarDelegate, UITableViewDataSource, UITableViewDelegate>

    {
        UITableView *friendslisttable;
        NSMutableArray *friendslist;
        NSMutableArray *friendsnamearray;
        NSMutableArray *profilepicarray;
        UIImageView * frndprofpic;
        UILabel *friendnamelabel;

        NSArray *searchResults;
    }
    @end

.m文件

- (void)viewDidLoad 
{
    [super viewDidLoad];
    self.title = @"Friends";

    friendslisttable = [[UITableView alloc]initWithFrame:CGRectMake(0,110 , self.view.frame.size.width, self.view.frame.size.height)] ;
    friendslisttable.delegate = self;
    friendslisttable. dataSource = self;
    [self.view addSubview:friendslisttable];

    friendsnamearray = [[NSMutableArray alloc]initWithObjects:@"friend1",@"friend12",@"friend13",@"friend14",@"friend15",@"friend16",@"friend17",@"friend18",@"friend19",@"friend20",@"friend21 ",@"friend22",@"", nil];

    profilepicarray = [[NSMutableArray alloc]initWithObjects:@"download3.jpeg", @"12045540_717548405011935_7183980263974928829_o.jpg" , @"download4.jpeg", @"download5.jpeg", @"download6.jpg", @"download12.jpeg", @"download13.jpeg", @"download16.jpeg",@"download3.jpeg", @"download6.jpg", @"download12.jpeg", @"download16.jpeg", @"  ",  nil];
}

#pragma mark - TableView Delegate Method -------------------->>>>

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 60;
}    

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return searchResults.count;
    }
    else {
        return friendsnamearray.count;
    }
}

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *cellidentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellidentifier ];

    if(!cell) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellidentifier];
        cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
    }
    friendslisttable  = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        friendslisttable = [searchResults objectAtIndex:indexPath.row];
    } else
    {
        friendslisttable = [friendsnamearray objectAtIndex:indexPath.row];
    }

    frndprofpic = [[UIImageView alloc]initWithFrame:CGRectMake(5, 5, 50, 50)];

    frndprofpic.image=[UIImage imageNamed:[profilepicarray objectAtIndex:indexPath.row]];
    [cell.contentView addSubview:frndprofpic];

    friendnamelabel = [[UILabel alloc]initWithFrame:CGRectMake(70, 10, 250, 50)];
    friendnamelabel.text = [friendsnamearray objectAtIndex:indexPath.row];
    friendnamelabel.font = [UIFont fontWithName:@"ChalkboardSE-Regular" size:20];
    [cell.contentView addSubview:friendnamelabel];

    return  cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (!indexPath.row) {
        ProfileViewController *u = [[ProfileViewController alloc]init];
        [self.navigationController pushViewController:u animated:YES];
    }
}

Answer 1

对于像你这样的情况，我建议你继承表视图单元格。在您的情况下为配置文件图像和名称创建2个属性。覆盖这些属性的setter并根据需要设置视图组件。

如果选择了行，您现在可以使用自定义单元格的相同属性，可以在推送之前将其设置为目标控制器的属性。

但是如果你想要做到这一点，你应该总是使用一个模型类（MyUserClass），然后可以将其插入到自定义单元格和视图控制器中。这样，您只为输入和输出保留一个属性。此外，如果您的模型类发生更改，或者您需要显示更多数据，则不会有太多代码会发生变化。例如，假设您的单元格保持不变，但在视图控制器上您还希望添加用户位置：您需要做的就是将location属性添加到模型类，然后仅在视图控制器中使用它。（如果您使用多个属性执行此操作，则单元格将需要收集该属性，即使它不显示它。）

让我举一个很好的例子，说明与表格视图，表格视图单元格和所有者（通常是视图控制器）的通信的一些用途。

这是一个如何从单元格中获取数据以及将自定义控件（按钮）挂钩到单元格并使用适当的数据通知事件所有者的显示。

请注意，这一切都是以编程方式完成的，因此您可以看到所有代码已完成。这可能都是通过故事板完成的。

部首：

#import <UIKit/UIKit.h>

@class MyModel;
@class MyTableViewCell;

@interface MyViewController : UIViewController

- (void)specialCellButtonPressed:(MyTableViewCell *)sender selectedModel:(MyModel *)model;

@end

来源：

#import "MyViewController.h"


#pragma mark - My model
/*
 MyModel:
 Model that we will use to hold the data
*/
@interface MyModel : NSObject

@property (nonatomic, strong) NSString *title;
@property (nonatomic, strong) NSString *descriptionText;

@end

#pragma mark - My model
/*
 MyTableViewCell:
 Custom table view cell to show the MyModel data
 */
@interface MyTableViewCell : UITableViewCell

@property (nonatomic, strong) MyModel *model;

@property (nonatomic, strong) UIButton *specialButton; // have the secondary action
@property (nonatomic, weak) MyViewController *owner; // note this may also be solved with a custom delegate but we want to bind this one to a concrete class that has type of MyViewController. Be careful to set this property to "weak"

@end

@implementation MyTableViewCell

- (void)setModel:(MyModel *)model
{
    _model = model; // standard asignment

    // set some views to show the actual data
    self.textLabel.text = model.title;
    self.detailTextLabel.text = model.descriptionText;
}

#pragma mark - custom button on the cell

// lazy load for the button
- (UIButton *)specialButton
{
    if(_specialButton == nil)
    {
        // put the button on the right side of the frame
        _specialButton = [[UIButton alloc] initWithFrame:CGRectMake(.0f, .0f, self.contentView.frame.size.width*.5f, self.contentView.frame.size.width*.5f)];
        [_specialButton addTarget:self action:@selector(spectialButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.contentView addSubview:_specialButton];
    }
    return _specialButton;
}

#pragma mark - layout

- (void)layoutSubviews
{
    [super layoutSubviews];
    // reposition the custom view if needed
    self.specialButton.frame = CGRectMake(.0f, .0f, self.contentView.frame.size.width*.5f, self.contentView.frame.size.width*.5f);
}

#pragma mark - actions

- (void)spectialButtonPressed:(id)sender
{
    // just report this to the delegate or rather the owner in this case
    [self.owner specialCellButtonPressed:self selectedModel:self.model];
}

@end


#pragma mark - My model
/*
 MyViewController:
 A view controller showing the table view
 */
@interface MyViewController ()<UITableViewDataSource, UITableViewDelegate>

@property (nonatomic, strong) NSArray *models;
@property (nonatomic, strong) UITableView *tableView;

@end

@implementation MyViewController

#pragma mark - lifetime

- (void)viewDidLoad {
    [super viewDidLoad];

    // fill some data for our table view
    NSMutableArray *models = [[NSMutableArray alloc] init];
    for(NSInteger i=0; i<24; i++)
    {
        MyModel *model = [[MyModel alloc] init];
        model.title = [NSString stringWithFormat:@"Cell %d", (int)(i+1)];
        model.descriptionText = [NSString stringWithFormat:@"This is a cell with index: %d", (int)(i)];
        [models addObject:model];
    }
    self.models = models;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self.tableView reloadData];
}

// lazy load from table view
- (UITableView *)tableView
{
    if(_tableView == nil)
    {
        _tableView = [[UITableView alloc] initWithFrame:CGRectMake(.0f, .0f, self.view.frame.size.width, self.view.frame.size.height)];
        _tableView.delegate = self;
        _tableView.dataSource = self;
        [self.view addSubview:_tableView];
    }
    return _tableView;
}

#pragma mark - layout

- (void)viewWillLayoutSubviews
{
    [super viewWillLayoutSubviews];
    // reposition the table view if needed
    self.tableView.frame = CGRectMake(.0f, .0f, self.view.frame.size.width, self.view.frame.size.height);
}

#pragma mark - table view

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.models.count;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 44.0f;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    MyTableViewCell *cell = [[MyTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:nil];
    cell.model = self.models[indexPath.row]; // assign the model from our list
    cell.owner = self;
    return cell;
}

// standard cell selection
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    MyTableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    MyModel *model = cell.model;
    /*
     Alternative if we have the data array (as we do in this case):

     MyModel *model = self.models[indexPath.row];

     */

    NSLog(@"Selected model: %@", model);
    // do whatever with the model
}

#pragma mark - special

- (void)specialCellButtonPressed:(MyTableViewCell *)sender selectedModel:(MyModel *)model
{
    NSLog(@"Special button for model pressed: %@", model);
}

@end




@implementation MyModel

// override description to get some usefull data
- (NSString *)description
{
    return [NSString stringWithFormat:@"<%p> %@ (%@)", self, self.title, self.descriptionText];
}

@end

Answer 2

在ProfileViewController中创建属性：

 @property (strong, nonatomic)UIImage *profilePicture;   
 @property (strong, nonatomic)NSString *name;

修改你的didSelectMethod，如下所示。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (!indexPath.row) {
    ProfileViewController *u = [[ProfileViewController alloc]init];
    UIImage *profileImage = [profilepicarray objectAtIndex:indexPath.row];
    NSString *name = [friendsnamearray objectAtIndex:indexPath.row];
    u.profilePicture = profileImage;
    u.name = name;
    [self.navigationController pushViewController:u animated:YES];
    }
}

Answer 3

您需要在ProfileViewController.h上添加两个属性。

@property (nonatomic, assign) NSStirng* str;

@property (nonatomic, assign) UIImage* img;

ProfileViewController.m

中的

@synthesize str;
@synthesize img;

在你的

中

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (!indexPath.row) {
    ProfileViewController *u = [[ProfileViewController alloc]init];

    u.str = [friendsnamearray objectAtIndex:indexPath.row];
    u.img = [UIImage imageNamed:[profilepicarray objectAtIndex:indexPath.row]];
    [self.navigationController pushViewController:u animated:YES];
}
}

您在ProfileViewController中使用

self.img
self.str

希望它可以帮到你。

Answer 4

使用didSelectRowAtIndexPath传递值。

   - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
        if (!indexPath.row) 
         {
            //get selected image and label text  here.
           NSString *lbltxt=[friendsnamearray objectAtIndex:indexPath.row];
           UIImage *img=[friendsnamearray objectAtIndex:indexPath.row];

           //pass this two value into `NSUserDefaults` and get from  the `NSUserDefaults` to another viewcontroller

           [[NSUserDefaults standardUserDefaults] setObject:UIImagePNGRepresentation(img) forKey:key];
           [[NSUserDefaults standardUserDefaults] setObject:lbltxt forKey:@"preferenceName"];
           [[NSUserDefaults standardUserDefaults] synchronize];

            ProfileViewController *u = [[ProfileViewController alloc]init];
            [self.navigationController pushViewController:u animated:YES];
        }
    }

Answer 5

你还没有传递要在“ProfileViewController”中显示的数据，那么VC将如何知道要显示的内容。

在导航到“ProfileViewController”之前，您需要传递要在下一个VC上显示的数据您可以通过创建“ProfileViewController”对象来传递数据，从而通过对象本身访问其成员。您可以访问和修改ProfileViewController类的成员，并使用它们来显示此类中的数据。

IOS：浏览tableView并在下一个视图上显示表视图数据

5 个答案: