该应用程序在xcode 11上运行,但是一旦我在xcode 12上运行它,就会出现细分错误:11错误。
表单调试发现问题出在此函数中,如果我评论该代码可以正常工作,那么对我来说似乎没有任何错误,是否发生了什么?
open func addViewController(_ vc:UIViewController)->Void{
controllers.append(vc)
// Setup the viewController view
vc.view.translatesAutoresizingMaskIntoConstraints = false
scrollview.addSubview(vc.view)
// Constraints
let metricDict = ["w":vc.view.bounds.size.width,"h":vc.view.bounds.size.height]
// - Generic cnst
vc.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[view(h)]", options:[], metrics: metricDict, views: ["view":vc.view] as [String: UIView]))
vc.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[view(w)]", options:[], metrics: metricDict, views: ["view":vc.view] as [String: UIView]))
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[view]|", options:[], metrics: nil, views: ["view":vc.view] as [String: UIView]))
// cnst for position: 1st element
if controllers.count == 1{
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[view]", options:[], metrics: nil, views: ["view":vc.view] as [String: UIView]))
// cnst for position: other elements
} else {
let previousVC = controllers[controllers.count-2]
if let previousView = previousVC.view {
// For this constraint to work, previousView can not be optional
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[previousView]-0-[view]", options:[], metrics: nil, views: ["previousView":previousView,"view":vc.view] as [String: UIView]))
}
if let cst = lastViewConstraint {
scrollview.removeConstraints(cst)
}
lastViewConstraint = NSLayoutConstraint.constraints(withVisualFormat: "H:[view]-0-|", options:[], metrics: nil, views: ["view":vc.view] as [String: UIView])
scrollview.addConstraints(lastViewConstraint!)
}
}
像这样的部分代码
let metricDict = ["w":vc.view.bounds.size.width,"h":vc.view.bounds.size.height]
,
["view":vc.view] as [String: UIView]
和
["previousView":previousView,"view":vc.view] as [String: UIView]
可能会导致该问题,因此您可以尝试进行轻量级的分段工作,以便编译器可以通过它
open func addViewController(_ vc:UIViewController)->Void{
controllers.append(vc)
// Setup the viewController view
vc.view.translatesAutoresizingMaskIntoConstraints = false
scrollview.addSubview(vc.view)
// Constraints
let metricDict:[String:CGFloat] = ["w":vc.view.bounds.size.width,"h":vc.view.bounds.size.height]
// - Generic cnst
let con:[String: UIView] = ["view":vc.view]
vc.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[view(h)]", options:[], metrics: metricDict, views: con ))
vc.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[view(w)]", options:[], metrics: metricDict, views: con ))
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[view]|", options:[], metrics: nil, views: con ))
// cnst for position: 1st element
if controllers.count == 1{
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[view]", options:[], metrics: nil, views: con))
// cnst for position: other elements
} else {
let previousVC = controllers[controllers.count-2]
let relt:[String: UIView] = ["previousView":previousView,"view":vc.view]
if let previousView = previousVC.view {
// For this constraint to work, previousView can not be optional
scrollview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[previousView]-0-[view]", options:[], metrics: nil, views:relt ))
}
if let cst = lastViewConstraint {
scrollview.removeConstraints(cst)
}
lastViewConstraint = NSLayoutConstraint.constraints(withVisualFormat: "H:[view]-0-|", options:[], metrics: nil, views: con)
scrollview.addConstraints(lastViewConstraint!)
}
}
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我来说两句