IPhone : Strange layout constraints with UITableViewCell subclass

I just met a strange issue about strange UITableViewCell subclass layout. I had configuring an UITableViewCell subclass with all of this stuff in code.

• iPhone 5s and lower WORK PERFECT

• iPhone 6 or plus WRONG :(

I am sure that is the subclass issue.

(lldb) po _tableView
<UITableView: 0x7fa5db054c00; frame = (0 0; 375 618); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7fa5d96649e0>; layer = <CALayer: 0x7fa5d96632a0>; contentOffset: {0, 0}; contentSize: {375, 15552}>

Code:

@interface ColorCell : UITableViewCell

@end 

@implementation ColorCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
    self.background  = [UIView new];
    self.top         = [UIView new];
    self.bottom      = [UIView new];

    self.contentView.translatesAutoresizingMaskIntoConstraints = NO;
    self.background.translatesAutoresizingMaskIntoConstraints  = NO;
    self.top.       translatesAutoresizingMaskIntoConstraints  = NO;
    self.bottom.    translatesAutoresizingMaskIntoConstraints  = NO;

    [self.contentView addSubview:self.background];
    [self.background addSubview:self.top];
    [self.background addSubview:self.bottom];

    self.top.backgroundColor        = [UIColor purpleColor];
    self.bottom.backgroundColor     = [UIColor blackColor];

  }
  return self;
}

- (void)updateConstraints
{
    [super updateConstraints];
    if (!self.didSetupConstraints) {

    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(_firstColor,_secondColor,_thirdColor,_fourthColor,_fifthColor,_background,_top,_bottom,_title,_stars,_favourites);

    NSString *format;
    NSArray *constraintsArray;
    NSDictionary *metrics = @{@"topHeight":@100.0, @"bottomHeight":@50};

    format = @"V:|[_background]|";
    constraintsArray = [NSLayoutConstraint constraintsWithVisualFormat:format options:NSLayoutFormatAlignAllCenterX metrics:nil views:viewsDictionary];
    [self.contentView addConstraints:constraintsArray];

    format = @"H:|[_background]|";
    constraintsArray = [NSLayoutConstraint constraintsWithVisualFormat:format options:NSLayoutFormatAlignAllCenterX metrics:nil views:viewsDictionary];
    [self.contentView addConstraints:constraintsArray];

    format = @"V:|[_top(topHeight)][_bottom(bottomHeight)]|";
    constraintsArray = [NSLayoutConstraint constraintsWithVisualFormat:format options:0 metrics:metrics views:viewsDictionary];
    [_background addConstraints:constraintsArray];

    format = @"H:|[_bottom]|";
    constraintsArray = [NSLayoutConstraint constraintsWithVisualFormat:format options:0 metrics:nil views:viewsDictionary];
    [_background addConstraints:constraintsArray];

    format = @"H:|[_top]|";
    constraintsArray = [NSLayoutConstraint constraintsWithVisualFormat:format options:0 metrics:nil views:viewsDictionary];
    [_background addConstraints:constraintsArray];

    self.didSetupConstraints = YES;
  }
}

Thanks.