因此,我创建了一个进度指示器视图,该视图在API调用中显示。我已经为其创建了一个自定义UIView类。
现在,一切正常。但是视图的位置应该居中,但不是。
我认为我有正确的约束条件,但仍然无法正常工作。
这是我的代码:
import Foundation
import UIKit
import UICircularProgressRing
import HGRippleRadarView
class ProgressIndicator : UIView {
@IBOutlet weak var contentView : UIView!
@IBOutlet weak var progressView : UICircularProgressRing!
@IBOutlet weak var logoContainerView : UIView!
@IBOutlet weak var rippleView : RippleView!
static let shared = ProgressIndicator()
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
func commonInit() {
Bundle.main.loadNibNamed("ProgressIndicator", owner: self, options: nil)
addSubview(contentView)
}
public func show(controller : UIViewController) {
setupLoadingView(controller : controller)
}
public func hide() {
removeLoadingView()
}
private func setupLoadingView(controller : UIViewController) {
controller.view.addSubview(self)
// adding contrints on main view
let leadingConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutConstraint.Attribute.leading, relatedBy: NSLayoutConstraint.Relation.equal, toItem: controller.view, attribute: NSLayoutConstraint.Attribute.leading, multiplier: 1, constant: 0)
let trailingConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutConstraint.Attribute.trailing, relatedBy: NSLayoutConstraint.Relation.equal, toItem: controller.view, attribute: NSLayoutConstraint.Attribute.trailing, multiplier: 1, constant: 0)
let topConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutConstraint.Attribute.top, relatedBy: NSLayoutConstraint.Relation.equal, toItem: controller.view, attribute: NSLayoutConstraint.Attribute.top, multiplier: 1, constant: 0)
let bottomConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutConstraint.Attribute.bottom, relatedBy: NSLayoutConstraint.Relation.equal, toItem: controller.view, attribute: NSLayoutConstraint.Attribute.bottom, multiplier: 1, constant: 0)
controller.view.addConstraints([leadingConstraint, trailingConstraint, topConstraint, bottomConstraint])
// adding constraints on content view
let leadingConstraint1 = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutConstraint.Attribute.leading, relatedBy: NSLayoutConstraint.Relation.equal, toItem: self, attribute: NSLayoutConstraint.Attribute.leading, multiplier: 1, constant: 0)
let trailingConstraint1 = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutConstraint.Attribute.trailing, relatedBy: NSLayoutConstraint.Relation.equal, toItem: self, attribute: NSLayoutConstraint.Attribute.trailing, multiplier: 1, constant: 0)
let topConstraint1 = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutConstraint.Attribute.top, relatedBy: NSLayoutConstraint.Relation.equal, toItem: self, attribute: NSLayoutConstraint.Attribute.top, multiplier: 1, constant: 0)
let bottomConstraint1 = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutConstraint.Attribute.bottom, relatedBy: NSLayoutConstraint.Relation.equal, toItem: self, attribute: NSLayoutConstraint.Attribute.bottom, multiplier: 1, constant: 0)
self.addConstraints([leadingConstraint1, trailingConstraint1, topConstraint1, bottomConstraint1])
self.setNeedsLayout()
self.reloadInputViews()
self.layoutIfNeeded()
}
}
这里是得到的结果:
这是xib文件的屏幕截图
您已添加约束,但未将translatesAutoresizingMaskIntoConstraints
设置为false
。
self.translatesAutoresizingMaskIntoConstraints = false
self.contentView.translatesAutoresizingMaskIntoConstraints = false