目标C：标签文本（UIControl的子类）未显示在UITableview中

tableview

UILabel

UIControl

UIControl

#import <Foundation/Foundation.h>

@interface UIControlLabel : UIControl
{
    UILabel *userNameLabel;
}

@property (nonatomic, retain) UILabel *userNameLabel;

@end

UIControl.m

#import \"UIControlLabel.h\"

@implementation UIControlLabel

@synthesize userNameLabel;

- (id)initWithFrame:(CGRect)frame 
{

    self = [super initWithFrame:frame];
    if (self) 
    {
        NSLog(@\"in init with frame method\");
        self.userNameLabel = [[UILabel alloc] init];        


        [self addSubview: userNameLabel];

    }
    return self;
}


@end

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString* PlaceholderCellIdentifier = @\"PlaceholderCell\";

    int row = [indexPath row];

    Answer *thisAnswer = [self.array objectAtIndex:row];

    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:PlaceholderCellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:PlaceholderCellIdentifier] autorelease];   

        UIControlLabel *control = [[UIControlLabel alloc]initWithFrame:CGRectMake(35, 10,100, 10)];
        control.userNameLabel.font = [UIFont fontWithName:@\"Helvetica-Bold\" size:13.0];
        control.tag = 2;

    [cell.contentView addSubview:control];

    }

    UIControlLabel *thisControl = (UIControlLabel *)[cell.contentView viewWithTag:2];
    thisControl.userNameLabel.text = [NSString stringWithFormat:@\"%@\",thisAnswer.userName];

return cell;
}