Swift 以编程方式将UIView放置在UILabel后面
我想问一下。我想在uilabel后面创建一个UIView,我正在从collectionview创建分段控件。如何在uilabel后面创建uiview? 这是我的密码Swift 以编程方式将UIView放置在UILabel后面,swift,autolayout,Swift,Autolayout,我想问一下。我想在uilabel后面创建一个UIView,我正在从collectionview创建分段控件。如何在uilabel后面创建uiview? 这是我的密码 nameLabel.translatesAutoresizingMaskIntoConstraints = false addSubview(nameLabel) NSLayoutConstraint.activate([ nameLabel.topAnchor.constra
nameLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(nameLabel)
NSLayoutConstraint.activate([
nameLabel.topAnchor.constraint(equalTo: topAnchor),
nameLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
nameLabel.bottomAnchor.constraint(equalTo: bottomAnchor),
nameLabel.trailingAnchor.constraint(equalTo: trailingAnchor)
])
let backgroundView = UIView()
backgroundView.backgroundColor = .white
backgroundView.translatesAutoresizingMaskIntoConstraints = false
addSubview(backgroundView)
insertSubview(backgroundView, aboveSubview: nameLabel)
backgroundView.leadingAnchor.constraint(equalTo: nameLabel.leadingAnchor).isActive = true
backgroundView.bottomAnchor.constraint(equalTo: nameLabel.bottomAnchor).isActive = true
backgroundView.widthAnchor.constraint(equalTo: nameLabel.widthAnchor, multiplier: 1).isActive = true
backgroundView.heightAnchor.constraint(equalToConstant: 48).isActive = true
视图将从后面添加到前面。只需在
添加子视图(新标签)
之前添加子视图(背景视图)
像这样的方法应该会奏效:
let backgroundView = UIView()
backgroundView.backgroundColor = .white
backgroundView.translatesAutoresizingMaskIntoConstraints = false
addSubview(backgroundView)
nameLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(nameLabel)
NSLayoutConstraint.activate([
nameLabel.topAnchor.constraint(equalTo: topAnchor),
nameLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
nameLabel.bottomAnchor.constraint(equalTo: bottomAnchor),
nameLabel.trailingAnchor.constraint(equalTo: trailingAnchor),
backgroundView.leadingAnchor.constraint(equalTo: nameLabel.leadingAnchor),
backgroundView.bottomAnchor.constraint(equalTo: nameLabel.bottomAnchor),
backgroundView.widthAnchor.constraint(equalTo: nameLabel.widthAnchor, multiplier: 1),
backgroundView.heightAnchor.constraint(equalToConstant: 48)
])
视图将从后面添加到前面。只需在
添加子视图(新标签)
之前添加子视图(背景视图)
像这样的方法应该会奏效:
let backgroundView = UIView()
backgroundView.backgroundColor = .white
backgroundView.translatesAutoresizingMaskIntoConstraints = false
addSubview(backgroundView)
nameLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(nameLabel)
NSLayoutConstraint.activate([
nameLabel.topAnchor.constraint(equalTo: topAnchor),
nameLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
nameLabel.bottomAnchor.constraint(equalTo: bottomAnchor),
nameLabel.trailingAnchor.constraint(equalTo: trailingAnchor),
backgroundView.leadingAnchor.constraint(equalTo: nameLabel.leadingAnchor),
backgroundView.bottomAnchor.constraint(equalTo: nameLabel.bottomAnchor),
backgroundView.widthAnchor.constraint(equalTo: nameLabel.widthAnchor, multiplier: 1),
backgroundView.heightAnchor.constraint(equalToConstant: 48)
])
您可以使用@Vacawama答案,或者您应该注意到苹果提供了2个API,如:
func sendSubviewToBack(_ view: UIView)
及
因此,您可以通过编程方式处理视图层次结构
也许你可以尝试将背景视图移到故事板标签上方,这样你就可以将它放在后面(因为它是故事板中的先入先出)
或者使用sendSubviewToBack(backgroundView)
或者使用将SubviewToFront(名称标签)
或者
view.addSubview(backgroundView)
然后view.addSubview(namelab)
您可以使用@Vacawama答案,或者您应该注意到苹果提供了两种API,如:
func sendSubviewToBack(_ view: UIView)
及
因此,您可以通过编程方式处理视图层次结构
也许你可以尝试将背景视图移到故事板标签上方,这样你就可以将它放在后面(因为它是故事板中的先入先出)
或者使用sendSubviewToBack(backgroundView)
或者使用将SubviewToFront(名称标签)
或者view.addSubview(backgroundView)
然后view.addSubview(namelab)