[英]Using Autolayout Constraints programmatically to center a UIImageView inside a UIView Swift 2.3 iOS10
[英]How to center horizontally 2 or more UIViews inside a UIView container using autolayout programmatically in Swift 3.0
我試圖在UIView
水平居中2個或更多UIView
例如
| [UIView1] [UIView2] |
| [UIView1] [UIView2] [UIView3] |
要么
| [UIView1] [UIView2] [UIView3] [UIView4] |
我將這些約束添加到容器視圖中的所有視圖
let horizontalConstraint = NSLayoutConstraint(item: views[N], attribute: .centerX, relatedBy: .equal, toItem: container, attribute: .centerX, multiplier: 1, constant: 0)
let verticalConstraint = NSLayoutConstraint(item: views[N], attribute: .bottom, relatedBy: .equal, toItem: container, attribute: .centerY, multiplier: 1, constant: 0)
let widthConstraint = NSLayoutConstraint(item: views[N], attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: width)
let heightConstraint = NSLayoutConstraint(item: views[N], attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: height)
我在每個視圖之間添加了間距約束
let spacingConstraint = NSLayoutConstraint(item: views[N], attribute: .left, relatedBy: .equal, toItem: views[N+1], attribute: .right, multiplier: 1, constant: 10)
上述約束水平居中所有視圖。
如果我將horizontalConstraint
的優先級更改為750,那么我會得到類似的東西
正如您所看到的,當我有奇數個視圖時,它們將被正確地水平對齊,但是當具有偶數個視圖時則不是這種情況。
如何在不使用其他容器或間隔視圖的情況下,以編程方式將任意偶數個視圖內部和另一個視圖水平居中?
你應該使用UIStackView
。 如果您不知道如何使用UIStackView
,可以查看本教程。
這是堆棧視圖應該看起來相似的方式。
請記住,在Stack View的屬性檢查器中,您需要輸入Axis。
無論如何,如果您仍想以編程方式添加約束,我建議使用SnapKit 。
以下是如何使用它的示例:
let box = UIView()
let container = UIView()
container.addSubview(box)
box.snp.makeConstraints { (make) -> Void in
make.size.equalTo(50)
make.center.equalTo(container)
}
正如您所看到的,使用SnapKit的代碼要少得多。
所以,我能夠與的幫助來完成這個UIStackView
所推薦的@Sivajee Battina和@Nedim。 我創建了一個UIStackView
屬性,並按如下方式設置視圖
self.view.addSubview(container)
labelContainer.translatesAutoresizingMaskIntoConstraints = false
container.addSubview(stackContainer)
stackContainer.translatesAutoresizingMaskIntoConstraints = false
stackContainer.axis = .horizontal
stackContainer.distribution = .equalSpacing
stackContainer.alignment = .bottom
stackContainer.spacing = spacing
然后我添加了約束如下
container.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 10.0).isActive = true
container.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 10.0).isActive = true
container.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -10.0).isActive = true
container.widthAnchor.constraint(equalToConstant: containerWidth).isActive = true
container.heightAnchor.constraint(equalToConstant: containerHeight).isActive = true
stackContainer.centerXAnchor.constraint(equalTo: container.centerXAnchor).isActive = true
stackContainer.centerYAnchor.constraint(equalTo: container.centerYAnchor).isActive = true
for view in self.views {
view.widthAnchor.constraint(equalToConstant: viewWidth).isActive = true
view.heightAnchor.constraint(equalToConstant: viewHeight).isActive = true
}
導致解決方案!!
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