如何在ios swift中以编程方式创建自动布局等宽约束?
如何在多个视图中以编程方式提供相等宽度和相等高度的约束。我通过自动布局检查了google,但并不是完美的答案 我的代码如下所示:如何在ios swift中以编程方式创建自动布局等宽约束?,ios,swift,autolayout,Ios,Swift,Autolayout,如何在多个视图中以编程方式提供相等宽度和相等高度的约束。我通过自动布局检查了google,但并不是完美的答案 我的代码如下所示: var countNoOfViews:Int = 3 @IBOutlet var viewForRow1: UIView! override func viewDidLoad() { super.viewDidLoad() self.specialButtonViewLeft() } func specialButtonViewLef
var countNoOfViews:Int = 3
@IBOutlet var viewForRow1: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.specialButtonViewLeft()
}
func specialButtonViewLeft(){
for i in 0..<countNoOfViews{
var customView:UIView!
customView = UIView(frame: CGRect.zero)
customView.translatesAutoresizingMaskIntoConstraints = false
viewForRow1.addSubview(customView)
let widthConstraint = NSLayoutConstraint(item: customView, attribute: .width, relatedBy: .equal,toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 20.0)
let topConstraint = NSLayoutConstraint(item: customView, attribute: .top, relatedBy: .equal,toItem: self.viewForRow1, attribute: .top, multiplier: 1.0, constant: 0)
let bottomConstraint = NSLayoutConstraint(item: customView, attribute: .bottom, relatedBy: .equal,toItem: self.viewForRow1, attribute: .bottom, multiplier: 1.0, constant: 0)
let leadingConstraint = NSLayoutConstraint(item: customView, attribute: .leading, relatedBy: .equal, toItem: self.viewForRow1, attribute: .leading, multiplier: 1, constant: customLeadingSpaceLeft)
customLeadingSpaceLeft = customLeadingSpaceLeft + customViewWidth
arrayLeftBtnConstraints.append(widthConstraint)
if i == 0{
customView.backgroundColor = UIColor.red
}else if i == 1{
customView.backgroundColor = UIColor.green
}else if i == 2{
leftViewVal = customLeadingSpaceLeft
customView.backgroundColor = UIColor.black
}
customView.alpha = 0.50
viewForRow1.addConstraints([widthConstraint, leadingConstraint,topConstraint,bottomConstraint])
}
}
var countNoOfViews:Int=3
@IBOUTLE var viewForRow1:UIView!
重写func viewDidLoad(){
super.viewDidLoad()
self.specialButtonViewLeft()
}
func specialButtonViewLeft(){
对于0..中的i,请尝试以下方法:
let widthConstraint = NSLayoutConstraint(item: customView, attribute: .width, relatedBy: .equal, toItem: viewForRow1, attribute: .width, multiplier: 0.25, constant: 0.0)
乘数:0.25
,表示自定义视图的宽度将是父视图的1/4,视图的行1
您有三种可能的方法:
1) 通过使用锚:
view.widthAnchor.constraint(equalTo:otherView.widthAnchor,乘数:1.0)。isActive=true
2) 视觉格式:
简单示例-“H:|[otherView]-[view(=otherView)]|”
3) “老派”制约因素:
NSLayoutConstraint(项:#视图,属性:。宽度,相关者:。相等,到项:#其他视图,属性:。宽度,乘数:1.0,常数:0.0)。isActive=true
希望它能帮助一些人。谢谢。但是我有多个视图将宽度等分为超级视图。另外,我想根据方向更改编程自动布局约束的宽度,如纵向-30和横向-40宽度。你能完成工作吗?甚至更短。view.widthAnchor.constraint(equalTo:otherView.widthAnchor).isActive=true
:)