重新加载单元格中的 UITableview 数据

Question

[self.countryList reloadRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:6 inSection:0], nil] withRowAnimation:UITableViewRowAnimationNone]; // or NO ;)

我的问题是我有一个包含 10 多个项目的表格视图，其中只有 6 个单元格，但是当加载数据并滚动表格时，单元格 7 中没有数据。如何重新加载该 1 个单元格中的数据？

上面的代码是我正在使用的，它不起作用！

---编辑---

if (cell == nil) {  

    cell =[[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:identifier]autorelease];
    //[cell setBackgroundColor: [UIColor clearColor]];




    mainLabel = [[[UILabel alloc] initWithFrame:CGRectMake(52.0, 0.0, 200.0, 20.0)] autorelease];           
    mainLabel.tag = 1;          
    mainLabel.font = [UIFont systemFontOfSize:14.0];            
    mainLabel.textAlignment = UITextAlignmentLeft;          
    mainLabel.textColor = [UIColor blackColor];
    mainLabel.opaque = YES;
    mainLabel.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:mainLabel];

    revenue = [[[UILabel alloc] initWithFrame:CGRectMake(52.0, 20.0, 150.0, 20.0)] autorelease];            
    revenue.tag = 3;            
    revenue.font = [UIFont systemFontOfSize:14.0];          
    revenue.textAlignment = UITextAlignmentLeft;            
    revenue.textColor = [UIColor blackColor];
    revenue.opaque = YES;
    revenue.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:revenue];

    promos = [[[UILabel alloc] initWithFrame:CGRectMake(252.0, 20.0, 150.0, 20.0)] autorelease];            
    promos.tag = 4;         
    promos.font = [UIFont systemFontOfSize:14.0];           
    promos.textAlignment = UITextAlignmentLeft;         
    promos.textColor = [UIColor blackColor];
    promos.opaque = YES;
    promos.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:promos];

    updates = [[[UILabel alloc] initWithFrame:CGRectMake(252.0, 0.0, 200.0, 20.0)] autorelease];            
    updates.tag = 5;            
    updates.font = [UIFont systemFontOfSize:14.0];          
    updates.textAlignment = UITextAlignmentLeft;            
    updates.textColor = [UIColor blackColor];
    updates.opaque = YES;
    updates.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:updates];

    photo = [[[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 50.0)] autorelease];
    photo.contentMode= UIViewContentModeScaleToFill;
    photo.tag = 2;
    photo.opaque = YES;
    photo.backgroundColor=[UIColor clearColor];
    [cell.contentView addSubview:photo]; 

}    
else {
    cell.clearsContextBeforeDrawing=YES;
    mainLabel = (UILabel *)[cell.contentView viewWithTag:1];    
    photo = (UIImageView *)[cell.contentView viewWithTag:2];
    promos=(UILabel *)[cell.contentView viewWithTag:4];
    revenue=(UILabel *)[cell.contentView viewWithTag:3];
    updates=(UILabel *)[cell.contentView viewWithTag:5];


    if(photo.image){
        photo.image=nil;
    }
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *imageURL =[NSString stringWithString:[(arrayResults*)[tweets objectAtIndex:indexPath.row] myCountryIcon]];

    NSArray *myArray = [imageURL componentsSeparatedByString: @"/"];
    NSString *fileName = [NSString stringWithString:[myArray lastObject]];
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/AppIcons"];
    NSString* path = [dataPath stringByAppendingPathComponent:fileName];
    UIImage* image = [UIImage imageWithContentsOfFile:path];
    if (!image) {

        UIApplication* app = [UIApplication sharedApplication];
        app.networkActivityIndicatorVisible = YES;
        // Create an array with the URL and name.  
        NSMutableArray *arr = [[NSMutableArray alloc] initWithObjects:fileName,imageURL, nil  ];  


        [self performSelectorInBackground:@selector(loadImageInBackground:)  withObject:arr]; 
        [arr release];


    }               
    else{
        photo.image=image;


    }
    NSString*promostext=[[NSString alloc] initWithFormat:@"promos:%@",[[(arrayResults*)[tweets objectAtIndex:indexPath.row] mypromos]stringValue] ];
    NSString*revenuetext=[[NSString alloc] initWithFormat:@"revenue:%@",[(arrayResults*)[tweets objectAtIndex:indexPath.row] myrevenue] ];
    NSString*updatestext=[[NSString alloc] initWithFormat:@"updates:%@",[[(arrayResults*)[tweets objectAtIndex:indexPath.row] myupdates]stringValue] ];

    mainLabel.text=[(arrayResults*)[tweets objectAtIndex:indexPath.row] myCountryName];
    promos.text=promostext;
    revenue.text=revenuetext;
    updates.text=updatestext;
    [promostext release];
    [revenuetext release];
    [updatestext release];

}

Answer 1

这通常是cellForRowAtIndexPath: 的回收/重用机制中的误用。

滚动时会重复使用单元格，以避免分配过多的 UITableViewCells。因此，在这两种情况下，您都需要在 cellForRowAtIndexPath: 中设置单元格的内容，无论是刚刚分配单元格 (cell==nil) 还是重复使用了单元格 (cell!=nil)。