通过按钮，标签和单元重用问题检查图像在uitableviewcell中无法正常工作

Question

滚动后检查图像移除。
我必须重用cell并且也不想使用 didselectrow 方法，因为我在一个单元格中有几个按钮，这是我为stackoverflow创建的示例。

我在谷歌搜索了很多，发现无助。

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;

        }
    }

Answer 1

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

当一个单元格没有在屏幕上显示片刻然后再次显示时，再次调用cellForRow。

这里的问题是，您不存储imageView.hidden已设置为NO的单元格。这就是为什么每次再次显示一个单元格时，cellForRow：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，如果该索引路径的单元格是imageView.hidden = NO。

Answer 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];


    }