ios - UITableViewCell 子类的内容重复

Question

我有一个 UItableViewCell 子类，代码如下:

#import "RegisterTableViewCell.h"

@implementation RegisterTableViewCell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code

        _titolo = [[UILabel alloc]initWithFrame:CGRectMake(10, 0, 80, self.frame.size.height)];
        _titolo.numberOfLines = 0;
        _titolo.lineBreakMode = NSLineBreakByWordWrapping;
        [self.contentView addSubview:_titolo];

        _linearettangolare = [[UIView alloc]initWithFrame:CGRectMake(100, 10, 1, 25)];
        _linearettangolare.backgroundColor = [UIColor whiteColor];
        [self.contentView addSubview:_linearettangolare];

        _input = [[UITextField alloc]initWithFrame:CGRectMake(_linearettangolare.frame.origin.x+6, 10, self.frame.size.width-110, 25)];

        [self.contentView addSubview:_input];
    }
    return self;
}

- (void)awakeFromNib
{
    // Initialization code
}



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

    // Configure the view for the selected state
}

@end

和一个cellforrowatindexath 方法这样写:

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

    static NSString *cellIdentifier = @"Cell";

    RegisterTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil) {
        cell = [[RegisterTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }

    cell.titolo.text = @"Conferma password:";
    cell.titolo.font = [UIFont boldSystemFontOfSize:13];

    if (indexPath.row%2 == 0) {
        cell.backgroundColor = [UIColor colorWithRed:143/255.0 green:177/255.0 blue:188/255.0 alpha:1.0/1.0];
        cell.titolo.textColor = [UIColor whiteColor];
        cell.linearettangolare.backgroundColor = [UIColor whiteColor];
        cell.input.textColor = [UIColor whiteColor];
        cell.input.secureTextEntry = FALSE;


    }
    else{
        cell.backgroundColor = [UIColor colorWithRed:175/255.0 green:209/255.0 blue:227/255.0 alpha:1.0/1.0];
        cell.titolo.textColor = [UIColor colorWithRed:138/255.0 green:140/255.0 blue:142/255.0 alpha:1.0/1.0];
        cell.linearettangolare.backgroundColor = [UIColor colorWithRed:138/255.0 green:140/255.0 blue:142/255.0 alpha:1.0/1.0];
        cell.input.textColor =[UIColor colorWithRed:138/255.0 green:140/255.0 blue:142/255.0 alpha:1.0/1.0];
        cell.input.secureTextEntry = TRUE;
    }

    return  cell;
}

我遇到了以下问题:

当我的 UITableView 上下滚动时，然后我将文本添加到 inputtextfield，该内容“迁移”到另一个 UITableViewCell。

我的代码有什么问题？

Answer 1

我认为您的“问题”是单元格被重复使用，并且它们的内容在被重复使用之前从未被重置。

要么在使用prepareForReuse 重用单元格之前准备单元格(参见 here )
或清除 cellForRowAtIndexPath

中的输入字段

根据 Apple 指南，它(对于单元格内容)的首选方式是在 cellForRowAtIndexPath

内

For performance reasons, you should only reset attributes of the cell that are not related to content, for example, alpha, editing, and selection state. The table view's delegate in tableView:cellForRowAtIndexPath: should always reset all content when reusing a cell.