viewForHeaderInSection 对齐错误 (Swift 3)

Question

我不知道我哪里错了。文本始终从左对齐。

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let sectionHeight:CGFloat = 40
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: Helper.screenWidth, height: sectionHeight))
        headerView.backgroundColor = UIColor.init(fromHex: "F7F7F7")
        headerView.layer.borderColor = UIColor.init(fromHex: "F7F7F7").cgColor
        let titleLabel = UILabel()
        titleLabel.font = UIFont(name: "HelveticaNeue", size: 15)
        titleLabel.textColor = UIColor.darkGray
        titleLabel.text = "Dummy test Dummy test"
        titleLabel.textAlignment = NSTextAlignment.center
        titleLabel.sizeToFit()
        var frame = titleLabel.frame
        frame.origin.x = 15
        frame.origin.y = sectionHeight - frame.size.height - 7
        titleLabel.frame = frame
        headerView.addSubview(titleLabel)

        return headerView

PS : screenWidth = UIScreen.main.bounds.size.width

Answer 1

    titleLabel.sizeToFit()

上面一行根据文本长度制作标签的边框。（您可以尝试更改标签的背景颜色以查看标签的宽度）。删除上面的行，您将获得首选的文本对齐方式。

同样设置label的frame如下：-

var frame = CGRect(x: 0, y: 0, width: Helper.screenWidth, height: headerView.frame.size.height)
frame.origin.x = 15
frame.origin.y = sectionHeight - frame.size.height - 7
titleLabel.frame = frame

Answer 2

当您调用 sizeToFit 时，这将 shrink/expand 标签匹配文本的大小，因此该标签内的任何文本对齐方式都已过时。

我想你的意思是titleLabel.adjustsFontSizeToFitWidth = true；如果（且仅当）文本太大而无法显示时，这将使用较小的字体。

Answer 3

试试这个

 let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: Helper.screenWidth, height: sectionHeight))

 headerView.addSubview(titleLabel)

 titleLabel.center = headerView.center

Answer 4

您的文字在您的标签中居中，但您的标签在您的视图中不居中。您通过调用 titleLabel.sizeToFit().

调整了标签大小以适合您的文本

尝试做：

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let sectionHeight:CGFloat = 40
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: Helper.screenWidth, height: sectionHeight))
        headerView.backgroundColor = UIColor.init(fromHex: "F7F7F7")
        headerView.layer.borderColor = UIColor.init(fromHex: "F7F7F7").cgColor
        let titleLabel = UILabel()
        titleLabel.font = UIFont(name: "HelveticaNeue", size: 15)
        titleLabel.textColor = UIColor.darkGray
        titleLabel.text = "Dummy test Dummy test"
        titleLabel.textAlignment = NSTextAlignment.center
        titleLabel.sizeToFit()

        titleLabel.frame = CGRect(x: 15.0, y: sectionHeight - frame.size.height - 7, width: headerView.size.width - 15.0*2.0, height: titleLabel.size.height)

        headerView.addSubview(titleLabel)

        return headerView
}

viewForHeaderInSection 对齐错误 (Swift 3)

viewForHeaderInSection alignment wrong (Swift 3)

uitableview

ios

swift

swift3