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我在xcode 5项目的autolayout上遇到了麻烦.我正在使用带有导航控制器的普通视图控制器.我有一个MKMapView在上半部分和一个UITableView在下半部分.我正在使用storyboards,并已配置原型UITableViewCell,但我通过代码添加约束.我已经仔细检查了原型中的每个控件,并且没有看到任何配置.我添加约束时出现问题UITableViewCell.我在单元格中有以下代码:

-(void)updateConstraints {
    [super updateConstraints];
    //first remove old constraints
    [self removeConstraints:self.constraints];
    [self.nameLabel removeConstraints:self.nameLabel.constraints];
    [self.addressLabel removeConstraints:self.nameLabel.constraints];
    [self.rentableSquareFeetLabel removeConstraints:self.rentableSquareFeetLabel.constraints];
    [self.lastSaleAmountLabel removeConstraints:self.lastSaleAmountLabel.constraints];
    [self.lastSaleDateLabel removeConstraints:self.lastSaleAmountLabel.constraints];
    [self.thumbnailImageView removeConstraints:self.thumbnailImageView.constraints];

    //then set up constraints
    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(_thumbnailImageView, _nameLabel, _rentableSquareFeetLabel, _lastSaleAmountLabel, _addressLabel, _lastSaleDateLabel);
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_thumbnailImageView(60)]-[_nameLabel(<=200)]-(>=8)-[_rentableSquareFeetLabel]-(>=8)-[_lastSaleAmountLabel]|" options:0 metrics:nil views:viewsDictionary]];
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[_nameLabel]-(-4)-[_addressLabel]" options:NSLayoutFormatAlignAllLeading metrics:nil views:viewsDictionary]];
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[_lastSaleAmountLabel]-(-4)-[_lastSaleDateLabel]" options:NSLayoutFormatAlignAllLeading metrics:nil views:viewsDictionary]];
}

我在调试控制台中收到以下内容.该异常由第一个addConstraints行触发.如果我只是继续通过那些,那么最终一切都显示应该是,因为看起来xcode正在选择打破正确的约束:

2013-09-25 15:07:14.169 PECProperties[32381:a0b] Unable to simultaneously satisfy constraints.  Probably at least …