通过按钮、标签和单元格重用问题检查 uitableviewcell 中的图像无法正常工作

Posted 2023-03-04

【中文标题】通过按钮、标签和单元格重用问题检查 uitableviewcell 中的图像无法正常工作

【英文标题】：Check image not working properly in uitableviewcell over button, tag and cell reuse issue

【发布时间】：2013-05-03 10:37:34

【问题描述】：

检查滚动后删除的图像。 我必须重用单元格，也不想使用 didselectrow 方法，因为我在一个单元格中有多个按钮，这是我为 *** 创建的示例。

我在google上搜索了很多，发现很无奈。

这是我的示例代码

//
//  TVViewController.h
//  tableviewcheck



#import <UIKit/UIKit.h>

@interface TVViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>

    UITableView *sampleTableView;
    UIImageView * imageView1;
    UIButton* aButton1;
    UIImageView *imageViewchk1;
    int tag;



@property (nonatomic, strong) IBOutlet UITableView *sampleTableView;

@end


//  TVViewController.m
//  tableviewcheck

#import "TVViewController.h"

@interface TVViewController ()

@end

@implementation TVViewController
@synthesize sampleTableView;

- (void)viewDidLoad

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


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
    // Return the number of sections.
    return 1;


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    // Return the number of rows in the section.
    // Usually the number of items in your array (the one that holds your list)
    //  NSLog(@"selected %i and deliveryArray %i",[queueArray count],[deliveryArray count]);
                return 50;



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    //Where we configure the cell in each row

    // NSString *CellIdentifier =[NSString stringWithFormat:@"%i-%i", indexPath.section,indexPath.row];
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell;

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) 
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]autorelease];
        [cell setSelectionStyle:UITableViewCellSelectionStyleNone];

    
        imageViewchk1 = [[UIImageView alloc] initWithFrame:CGRectMake(56,0 , 24,24)];
        imageViewchk1.image = [UIImage imageNamed:@"check.png"];
        imageViewchk1.tag=indexPath.row+10000;
          imageViewchk1.hidden=YES;

        imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80,80)];
        imageView1.image = [UIImage imageNamed:@"newframe.png"];

        aButton1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [aButton1 setTag:indexPath.row];
        [aButton1 setImage:imageView1.image forState:UIControlStateNormal];
        aButton1.frame = CGRectMake(0, 0, 80,80);
        [aButton1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [aButton1 addSubview:imageViewchk1];
        [cell.contentView addSubview:aButton1];

    return cell;

       


-(void)buttonClicked:(UIButton*)sender 
    tag = sender.tag;
    NSLog(@"buttonClicked %i",tag);

    UIImageView *imageView = (UIImageView *)[sampleTableView viewWithTag:tag+10000];


        if(imageView.hidden)
        
            imageView.hidden=NO;
        
        else 
            imageView.hidden=YES;

        
    

【参考方案1】：

嗯，你实现的问题是，你只在 buttonClicked 方法中设置了 imageView.hidden 属性。

当一个单元格在屏幕上暂时未显示然后再次显示时，将再次调用 cellForRow。

这里的问题是，您没有将 imageView.hidden 设置为 NO 存储在哪个单元格中。这就是为什么每次再次显示单元格时，cellForRow: 都会将其 imageView.hidden 设置为 YES。

因此解决方案是存储单元格的编号，其中 imageView.hidden= NO 并检查 cellForRow 如果该索引路径中的单元格是 imageView.hidden= NO 的单元格。

【参考方案2】：

为搜索相同功能的人回答我自己的问题，这里我是如何进行更改的

- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    tempArray=[[NSMutableArray alloc] init];
    for(int count=0;count<50;count++)
        [tempArray addObject:[NSNumber numberWithBool:NO]];


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
    // Return the number of sections.
    return 1;


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    // Return the number of rows in the section.
    // Usually the number of items in your array (the one that holds your list)
    //  NSLog(@"selected %i and deliveryArray %i",[queueArray count],[deliveryArray count]);
                return 50;



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
      static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell;

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) 
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]autorelease];
        [cell setSelectionStyle:UITableViewCellSelectionStyleNone];



    

    imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80,80)];
    imageView1.image = [UIImage imageNamed:@"newframe.png"];

    imageViewchk1 = [[UIImageView alloc] initWithFrame:CGRectMake(56,0 , 24,24)];
    imageViewchk1.image = [UIImage imageNamed:@"check.png"];
    imageViewchk1.tag=indexPath.row+10000;
    imageViewchk1.hidden=YES;


    aButton1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [aButton1 setTag:indexPath.row];
    [aButton1 setImage:imageView1.image forState:UIControlStateNormal];
    aButton1.frame = CGRectMake(0, 0, 80,80);
    [aButton1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [aButton1 addSubview:imageViewchk1];


   BOOL selected=[[tempArray objectAtIndex:indexPath.row] boolValue];
    if(selected)
    
      //  imageViewchk1.image = [UIImage imageNamed:@"check.png"];

        imageViewchk1.hidden=NO;
    
    else
    
      imageViewchk1.hidden=YES;
    

      [cell.contentView addSubview:aButton1];

    return cell;

       



-(void)buttonClicked:(UIButton*)sender 
    tag = sender.tag;
    NSLog(@"buttonClicked %i",tag);


     NSIndexPath *index=[sampleTableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]];
     BOOL selected=[[tempArray objectAtIndex:index.row] boolValue];
    if(selected)
    
     [tempArray replaceObjectAtIndex:index.row withObject:[NSNumber numberWithBool:NO]];
    
    else
    [tempArray replaceObjectAtIndex:index.row withObject:[NSNumber numberWithBool:YES]];

    [sampleTableView reloadData];