Question

所以我正在关注一个教程，我正在试图弄清楚如何显示自定义单元格 -

我已经定义了一个负责每个单元格的类 -

    #import <UIKit/UIKit.h>

@interface SearchResultCell : UITableViewCell
@property(copy,nonatomic)NSString *name;
@property(copy,nonatomic)NSString *colour;

@end

.m文件 -

@implementation SearchResultCell{
    UILabel *_nameValue;
    UILabel *_colourValue;

}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        CGRect nameLabelRect = CGRectMake(0,5,70,15);
        UILabel *nameLabel = [[UILabel alloc] initWithFrame:nameLabelRect];
        nameLabel.textAlignment = NSTextAlignmentLeft;
        nameLabel.text = @"Name:";
        nameLabel.font = [UIFont boldSystemFontOfSize:12];
        [self.contentView addSubview: nameLabel];
        //so this is how I would add my rating view


        CGRect colourLabelRect = CGRectMake(0, 26,70, 15);
        UILabel *colourLabel = [[UILabel alloc] initWithFrame: colourLabelRect];
        colourLabel.textAlignment = NSTextAlignmentRight;
        colourLabel.text = @"Colour:";
        colourLabel.font = [UIFont boldSystemFontOfSize:12];
        [self.contentView addSubview: colourLabel];

        CGRect nameValueRect = CGRectMake(80,5,200,15);
        _nameValue = [[UILabel alloc] initWithFrame:nameValueRect];
        CGRect colourValueRect = CGRectMake(80,25,200,15);
        _colourValue = [[UILabel alloc] initWithFrame:colourValueRect];
        [self.contentView addSubview: _colourValue];


    }
    return self;
}

- (void)setName:(NSString* )n {
    if(![n isEqualToString:_name]){
        _name = [n copy];
        _nameValue.text = _name;
    }
}

- (void)setColor:(NSString *)c
{
    if (![c isEqualToString:_colour]) {
        _colour = [c copy];
        _colourValue.text = _colour;
    } }

这是我的表格绘制方法 -

-(UITableViewCell *)tableView:(UITableView *)tableView
        cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    SearchResultCell *cell = [self.resultTable dequeueReusableCellWithIdentifier:CellTableIdentifier];
    NSDictionary *rowData = self.resultsTuples[indexPath.row];
    cell.name = rowData[@"Name"];    
    cell.colour = rowData[@"Color"];
    return cell;
}

这是我正在初始化resultsTuples和东西的地方。

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.resultsTuples = @[
                       @{@"Name" : @"MacBook", @"Color" : @"White"},
                       @{@"Name" : @"MacBook Pro", @"Color" : @"Silver"},
                       @{@"Name" : @"iMac", @"Color" : @"Silver"},
                       @{@"Name" : @"Mac Mini", @"Color" : @"Silver"},
                       @{@"Name" : @"Mac Pro", @"Color" : @"Silver"}];

        [self.resultTable registerClass:[SearchResultCell class] forCellReuseIdentifier: CellTableIdentifier];
    // Do any additional setup after loading the view.
}

我看到的只是两个静态标签（名称和颜色），而不是从数组中填充的任何内容。我已经检查过某些东西实际上已被设置 - 而且它是，所以我不确定为什么这不起作用。

有人可以帮忙吗？

Answer 1

您未在_nameValue上添加cell.contentView UILabel。

    CGRect nameValueRect = CGRectMake(80,5,200,15);
    _nameValue = [[UILabel alloc] initWithFrame:nameValueRect];

     //Add _nameValue label as well
     [self.contentView addSubview: _nameValue];

    CGRect colourValueRect = CGRectMake(80,25,200,15);
    _colourValue = [[UILabel alloc] initWithFrame:colourValueRect];
    [self.contentView addSubview: _colourValue];

Answer 2

只需删除以下方法

即可

(void)setName:(NSString* )n { if(![n isEqualToString:_name]){ _name = [n copy]; _nameValue.text = _name; } }

(void)setColor:(NSString *)c { if (![c isEqualToString:_colour]) { _colour = [c copy]; _colourValue.text = _colour; } }

并更新CellforRowatindexpath

cell.nameValue.text = rowData[@"Name"]; 
cell.colorValue.text = rowData[@"Color"];

我不确定，但你可以尝试一下。

自定义UITableViewCell无法正确更新

2 个答案: