从 UITableviewCell 上的按钮导航到其他视图控制器的代码是啥？

Posted 2023-03-11

【中文标题】从 UITableviewCell 上的按钮导航到其他视图控制器的代码是啥？

【英文标题】：What will be the code for navigating from button on UITableviewCell to other view controller?从 UITableviewCell 上的按钮导航到其他视图控制器的代码是什么？

【发布时间】：2018-03-26 07:22:26

【问题描述】：

这是我的表格视图，

最初是这样的，当我点击这个单元格时，它会展开

我的问题：我在 UITableviewCell 中添加了一个按钮并为其提供了操作。当我单击附件按钮时，它必须导航到下一个视图。我尝试了下面的代码，但它适用于 UIViewcontroller，不适用于 UITableViewCell。

AttachmentView *attach=[self.storyboard instantiateViewControllerWithIdentifier:@"attachViewId"];

    [self.navigationController pushViewController:attach animated:YES];

如何做到这一点？

这是我的 ConversationTableViewCell.h 文件，

 #import <UIKit/UIKit.h>

    @interface ConversationTableViewCell : UITableViewCell

    @property (weak, nonatomic) IBOutlet UIImageView *profilePicView;

    @property (weak, nonatomic) IBOutlet UILabel *clientNameLabel;

    @property (weak, nonatomic) IBOutlet UILabel *internalNoteLabel;

    @property (weak, nonatomic) IBOutlet UILabel *timeStampLabel;

    -(void)setUserProfileimage:(NSString*)imageUrl;
    @property (weak, nonatomic) IBOutlet UIWebView *webView;
    @property (weak, nonatomic) IBOutlet UIView *view1;

    - (IBAction)clickedOnAttachment:(id)sender;

这是 ConversationTableViewCell.m 文件代码，

 #import "HexColors.h"
    #import "ConversationTableViewCell.h"
    #import <SDWebImage/UIImageView+WebCache.h>
    #import "AttachmentViewController.h"

    @implementation ConversationTableViewCell

    - (void)awakeFromNib 
        [super awakeFromNib];

    

    - (void)setSelected:(BOOL)selected animated:(BOOL)animated 
        [super setSelected:selected animated:animated];

      

    -(void)setUserProfileimage:(NSString*)imageUrl
    
       // self.profilePicView.layer.borderWidth=1.25f;
        self.profilePicView.layer.borderColor=[[UIColor hx_colorWithHexRGBAString:@"#0288D1"] CGColor];
        [self.profilePicView sd_setImageWithURL:[NSURL URLWithString:imageUrl]
                               placeholderImage:[UIImage imageNamed:@"default_pic.png"]];

    

    - (IBAction)clickedOnAttachment:(id)sender 

     //   NSLog(@"CLciked...!");

        UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main"
                                                                 bundle: nil];

        AttachmentViewController * attach=[mainStoryboard instantiateViewControllerWithIdentifier:@"attachId"];

        [self.navigation];
    
    @end

这是视图控制器代码，

// this is ConversationTableViewCell view controllers .m file

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

    ConversationTableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"ConvTableViewCell"];

    if (cell == nil)
    
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ConversationTableViewCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];
    
    NSDictionary *finaldic=[mutableArray objectAtIndex:indexPath.row];



@try


    attachmentArray=[finaldic objectForKey:@"attach"];

    if ([attachmentArray count] != 0)

        NSIndexPath *path;
        NSDictionary *attachDictionary=[attachmentArray objectAtIndex:path.row];
        //   NSLog(@"Attchment Dict is: %@",attachDictionary);

        NSString *numStr = [NSString stringWithFormat:@"%@", [attachDictionary objectForKey:@"file"]];
            else
    
        NSLog(@"EMpty aaray");
    



    cell.timeStampLabel.text=[utils getLocalDateTimeFromUTC:[finaldic objectForKey:@"created_at"]];


    NSString *body= [finaldic objectForKey:@"body"]; 
    NSRange range = [body rangeOfString:@"<body"];

    if(range.location != NSNotFound) 
        // Adjust style for mobile
        float inset = 40;
        NSString *style = [NSString stringWithFormat:@"<style>div max-width: %fpx;</style>", self.view.bounds.size.width - inset];
        body = [NSString stringWithFormat:@"%@%@%@", [body substringToIndex:range.location], style, [body substringFromIndex:range.location]];
    
    cell.webView.translatesAutoresizingMaskIntoConstraints = NO;
    [cell.webView loadhtmlString:body baseURL:nil];



   //NSString *system= @"System";
   NSString *fName=[finaldic objectForKey:@"first_name"];
   NSString *lName=[finaldic objectForKey:@"last_name"];
   NSString *userName=[finaldic objectForKey:@"user_name"];

   [Utils isEmpty:fName];
   [Utils isEmpty:lName];
   [Utils isEmpty:userName];



     if  ([Utils isEmpty:fName] && [Utils isEmpty:lName])
         if(![Utils isEmpty:userName])
        userName=[NSString stringWithFormat:@"%@",[finaldic objectForKey:@"user_name"]];
             cell.clientNameLabel.text=userName;
         else cell.clientNameLabel.text=@"System";
    
    else if ((![Utils isEmpty:fName] || ![Utils isEmpty:lName]) || (![Utils isEmpty:fName] && ![Utils isEmpty:lName]))
    
       NSString * fName12=[NSString stringWithFormat:@"%@ %@",fName,lName];

        cell.clientNameLabel.text=fName12;

    

// prifile image
        if([[finaldic objectForKey:@"profile_pic"] hasSuffix:@"system.png"] || [[finaldic objectForKey:@"profile_pic"] hasSuffix:@".jpg"] || [[finaldic objectForKey:@"profile_pic"] hasSuffix:@".jpeg"] || [[finaldic objectForKey:@"profile_pic"] hasSuffix:@".png"] )
        
            [cell setUserProfileimage:[finaldic objectForKey:@"profile_pic"]];
        
         else if(![Utils isEmpty:fName])
        
            [cell.profilePicView setImageWithString:fName color:nil ];
        
       else
       
           [cell.profilePicView setImageWithString:userName color:nil ];
       


@catch (NSException *exception)
    
        [utils showAlertWithMessage:exception.name sendViewController:self];
        NSLog( @"Name: %@", exception.name);
        NSLog( @"Reason: %@", exception.reason );
       // return;
    
    @finally
    
        NSLog( @" I am in cellForROwAtIndexPath method in Conversation ViewController" );

    


    return cell;

【问题讨论】：

你写过[self.navigationController attach animated:YES];或[self.navigationController pushViewController: attach animated:YES];

对不起，我忘了。 pushViewController 没有被复制。是的，我试过它给出了一个错误，即在 ConversationTableViewCell 上找不到 self.view 或 self.navigationController。

您是否在自定义单元子类中编写了该代码？

是的，我已经这样做了

请发布您的cellforrowatindexpath 代码。

【参考方案1】：

self.navigationController 在ConversationTableViewCell 类中不可用。

要在单击单元格/单元格上的按钮时推送UIViewController 的新实例，您应该使用Delegation design pattern。

示例 -

//ConversationTableViewCell.h

@protocol ConversationTableViewCellDelegate;

@interface ConversationTableViewCell : UITableViewCell

@property (assign, nonatomic) id < ConversationTableViewCellDelegate > delegate;

@end

@protocol ConversationTableViewCellDelegate <NSObject>

@optional

- (void)buttonTouchedForCell:(ConversationTableViewCell *)cell;

@end

//ConversationTableViewCell.m
@implementation ConversationTableViewCell

@synthesize delegate = _delegate;

- (IBAction)clickedOnAttachment:(id)sender 
        if ([self.delegate respondsToSelector:@selector(buttonTouchedForCell:)])
        [self.delegate buttonTouchedForCell:self];
    
@end


@interface YourController : UIViewController <ConversationTableViewCellDelegate>

@end

@implementation YourController

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

 ConversationTableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"ConvTableViewCell"];

        if (cell == nil)
        
           NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ConversationTableViewCell" owner:self options:nil];
           cell = [nib objectAtIndex:0];
        

        [cell setDelegate:self];

        // cell related code

        return cell;
    

    - (void) buttonTouchedForCell:(ConversationTableViewCell *)cell 

        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        AttachmentView *attach=[self.storyboard instantiateViewControllerWithIdentifier:@"attachViewId"];
        [self.navigationController pushViewController:attach animated:YES];
    

@end

【讨论】：

让我检查一下@sanjay

确定@Nikita，一切顺利！