虽然来自heightForRowAtIndexPath的单元格正确，但自定义UITableViewCell为空

Question

对不起，我错过了它。我有一个美丽的桌子，正确的（可变）行高。但所有的细胞都是空白的。应在每个单元格中填充三个标签。

UPDATE：FIX低于

@implementation MasterTableCell 

@synthesize labelDesc; 
@synthesize labelDuration; 
@synthesize labelName; 

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


    // name 
    CGRect frameTextLabel = CGRectMake(8, 2, 244, 25); 
    labelName = [[UILabel alloc] initWithFrame:frameTextLabel]; 
    labelName.lineBreakMode = UILineBreakModeTailTruncation; 
    labelName.font = [UIFont boldSystemFontOfSize:17.0]; 
    labelName.textColor = [UIColor blackColor]; 

    // description 
    labelDesc = [[UILabel alloc] init]; 
    labelDesc.lineBreakMode = UILineBreakModeWordWrap; 
    labelDesc.numberOfLines = 0; 
    labelDesc.textColor = [UIColor grayColor]; 
    labelDesc.font = [UIFont systemFontOfSize:14.0f]; 
    labelDesc.backgroundColor = [UIColor blueColor]; 

    // duration 
    CGRect frame = CGRectMake(252, 5, 40, 20); 
    labelDuration = [[UILabel alloc] initWithFrame:frame]; 
    labelDuration.font = [UIFont boldSystemFontOfSize:14.f ]; 
    labelDuration.textAlignment = UITextAlignmentRight; 
    labelDuration.backgroundColor = [UIColor redColor]; // to see it 

    [self.contentView addSubview:labelName]; 
    [self.contentView addSubview:labelDesc]; 
    [self.contentView addSubview:labelDuration]; 

    } 
    return self; 
} 

@end 

而且

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

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

    Recipe *recipeAtIndex = [sortedArray objectAtIndex:indexPath.row]; 

    cell.labelName.text = @"Test1"; 
    cell.labelDesc.text = @"Test2"; 
    cell.labelDuration.text = [TBCommon formattedStringforDuration:recipeAtIndex.duration withDelimeter:@":"]; 

    CGRect frameDescLabel = CGRectMake(8, 25, 284, [self heightForDescriptionFrame:recipeAtIndex.description]); 
    cell.labelDesc.frame = frameDescLabel; 

    return cell; 
} 

FIX

#import "MasterTableCell.h" 

@implementation MasterTableCell : UITableViewCell 

@synthesize labelDesc; 
@synthesize labelDuration; 
@synthesize labelName; 

- (void)awakeFromNib 
{ 
    [super awakeFromNib]; 

// name 
CGRect frameTextLabel = CGRectMake(8, 2, 244, 25); 
labelName = [[UILabel alloc] initWithFrame:frameTextLabel]; 
labelName.lineBreakMode = UILineBreakModeTailTruncation; 
labelName.font = [UIFont boldSystemFontOfSize:17.0]; 
labelName.textColor = [UIColor blackColor]; 

// description 
labelDesc = [[UILabel alloc] init]; 
labelDesc.lineBreakMode = UILineBreakModeWordWrap; 
labelDesc.numberOfLines = 0; 
labelDesc.textColor = [UIColor grayColor]; 
labelDesc.font = [UIFont systemFontOfSize:14.0f]; 

// duration 
CGRect frame = CGRectMake(252, 5, 40, 20); 
labelDuration = [[UILabel alloc] initWithFrame:frame]; 
labelDuration.textColor = [UIColor colorWithRed:38.0/255.0 green:111.0/255.0 blue:208.0/255.0 alpha:1]; 
labelDuration.font = [UIFont boldSystemFontOfSize:14.f ]; 
labelDuration.textAlignment = UITextAlignmentRight; 

[self.contentView addSubview:labelName]; 
[self.contentView addSubview:labelDesc]; 
[self.contentView addSubview:labelDuration]; 
} 

@end 

而且

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

static NSString *CellIdentifier = @"Cell"; 

MasterTableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

Recipe *recipeAtIndex = [sortedArray objectAtIndex:indexPath.row]; 

cell.labelName.text = recipeAtIndex.name; 
cell.labelDesc.text = recipeAtIndex.description; 
cell.labelDuration.text = [TBCommon formattedStringforDuration:recipeAtIndex.duration withDelimeter:@":"]; 

CGRect frameDescLabel = CGRectMake(8, 25, 284, [self heightForDescriptionFrame:recipeAtIndex.description]); 
cell.labelDesc.frame = frameDescLabel; 

return cell; 

} 

Answer 1

如果您使用的是Storyboard，initWithStyle将永远不会被调用。将标签创建代码移动到awakeFromNib中。

因为dequeueReusableCell总是返回一个单元格，所以您可以摆脱整个if（cell == nil）部分。

Answer 2

您是否认为您的表视图委托/数据源方法实际上被调用。尝试在cellForRowAtIndexPath方法中放置一个断点来验证。如果断点没有被打开，这意味着你的委托和数据源没有设置。设置这些。

我注意到的另一件事是，你没有为你的labelDesc实例变量设置框架。值得一看。

Answer 3

当我设置我的自定义单元格子类时，我使用的教程让我使用名为layoutSubviews的单独方法设置框架。对你来说，它看起来像

- (void) layoutSubviews 
{ 
    [super layoutSubviews]; 

    labelName.frame = CGRectMake(8, 2, 244, 25); 
    labelDuration.frame = CGRectMake(252, 5, 40, 20); 
} 

当我有什么要补充的是动态位于像labelDesc是，我不得不完全拉出来我定制单元类，并把它所有cellForRowAtIndexPath细胞（所以我会有labelDesc = [[UILabel alloc] initWithFrame...等cellForRowAtIndexPath之类的东西，在initWithStyle中没有任何东西）。

我不知道为什么这样做是与在initWithStyle中设置框架有什么不同，但它似乎为我工作。