swift ios使用循环为多个子视图添加约束

// 创建父视图
let parentView = UIView()
parentView.translatesAutoresizingMaskIntoConstraints = false

// 创建子视图
let subviews = [UILabel(), UILabel(), UILabel()]

// 添加子视图到父视图
for subview in subviews {
    parentView.addSubview(subview)
    subview.translatesAutoresizingMaskIntoConstraints = false
}

// 循环添加约束
for (index, subview) in subviews.enumerated() {
    // 添加约束：左边距离父视图左边的距离
    parentView.addConstraint(NSLayoutConstraint(item: subview, attribute: .leading, relatedBy: .equal, toItem: parentView, attribute: .leading, multiplier: 1.0, constant: CGFloat(index * 50)))
    
    // 添加约束：顶部距离父视图顶部的距离
    parentView.addConstraint(NSLayoutConstraint(item: subview, attribute: .top, relatedBy: .equal, toItem: parentView, attribute: .top, multiplier: 1.0, constant: 0))
    
    // 添加约束：宽度固定为100
    parentView.addConstraint(NSLayoutConstraint(item: subview, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 100))
    
    // 添加约束：高度固定为50
    parentView.addConstraint(NSLayoutConstraint(item: subview, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 50))
}

// 添加父视图到主视图
view.addSubview(parentView)