我对具有UIImageView和UILabel的UITableViewCell有问题。所有约束都以编程方式设置,因此可以调整约束,以使单元格的高度随UILabel的高度加上特定的填充而动态变化,而UIImageView必须适应UITableViewCell的高度。但是,当我放置图像时,单元格的高度会增加,直到达到图像的高度为止。
contentView.addSubview(coverView)
contentView.addSubview(indexUnitLabel)
NSLayoutConstraint.activate([
coverView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
coverView.topAnchor.constraint(equalTo: contentView.topAnchor),
coverView.bottomAnchor.constraint(equalTo: contentView.leadingAnchor),
coverView.widthAnchor.constraint(equalToConstant: 68),
titleLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: padding),
titleLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -padding),
titleLabel.leadingAnchor.constraint(equalTo: coverView.trailingAnchor, constant: padding),
titleLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -padding)
])
是否可以设置约束以使UIImageView的高度动态地适应单元格的高度?
答案 0 :(得分:1)
我假设您重新输入代码(而不是粘贴实际代码),因为您具有CoverView。 bottomAnchor 也等于contentView。 leaderAnchor 添加indexUnitLabel
作为子视图,然后尝试约束titleLabel
...
因此,您的约束应如下所示:
NSLayoutConstraint.activate([
coverView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
coverView.topAnchor.constraint(equalTo: contentView.topAnchor),
coverView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
coverView.widthAnchor.constraint(equalToConstant: 68),
indexUnitLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: padding),
indexUnitLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -padding),
indexUnitLabel.leadingAnchor.constraint(equalTo: coverView.trailingAnchor, constant: padding),
indexUnitLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -padding)
])
BUT ... 并不能为自动布局提供足够的信息,这些信息涉及您想要对像元高度进行的操作。
您说要使用标签高度(加上填充)确定单元格的高度,因此添加以下行:
indexUnitLabel.setContentHuggingPriority(.required, for: .vertical)
这告诉自动布局 不 将标签的高度扩展到其内容之外。
答案 1 :(得分:0)
不要从coverView
到contentView
到coverView
来约束titleLabel
。相应地调整填充。还要将translatesAutoresizingMaskIntoConstraints
设置为false。
titleLabel.translatesAutoresizingMaskIntoConstraints = false
coverView.translatesAutoresizingMaskIntoConstraints = false
titleLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: padding),
titleLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -padding),
titleLabel.leadingAnchor.constraint(equalTo: coverView.trailingAnchor, constant: padding),
titleLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -padding)
coverView.topAnchor.constraint(equalTo: titleLabel.topAnchor, constant: padding),
coverView.bottomAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: -padding),
coverView.leadingAnchor.constraint(equalTo: titleLabel.trailingAnchor, constant: padding),
coverView.trailingAnchor.constraint(equalTo: titleLabel.trailingAnchor, constant: -padding)