ios - 如何使用 Vertical constraintsWithVisualFormat (SWIFT) 实现 UIScrollView

Question

我需要在我的应用程序中使用 constraintsWithVisualFormat 实现 UIScrollView 可能有人会用一些代码指导我。谢谢!

import UIKit

class ViewController: UIViewController, UIScrollViewDelegate{

    var scrollView: UIScrollView!
    var containerView = UIView()


    //FUNCION PARA PERMITIR COLORES HEXÁDECIMALES
    func uicolorFromHex(rgbValue:UInt32)->UIColor{
        let red = CGFloat((rgbValue & 0xFF0000) >> 16)/256.0;
        let green = CGFloat((rgbValue & 0xFF00) >> 8)/256.0;
        let blue = CGFloat(rgbValue & 0xFF)/256.0;

        return UIColor(red:red, green:green, blue:blue, alpha:1.0);
    }
    //***


    override func viewDidLoad() {
        super.viewDidLoad()

        self.scrollView = UIScrollView()
        self.scrollView.delegate = self

        containerView = UIView()

        containerView.backgroundColor = uicolorFromHex(0x0099FF);
        containerView.setTranslatesAutoresizingMaskIntoConstraints(false);

        scrollView.addSubview(containerView)
        view.addSubview(scrollView)


        //*** DICCIONARIO
        let viewsDictionary = ["scrollView":scrollView
            ,"containerView":containerView]

        let view_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[scrollView]-0-|",
                                                                                        options: NSLayoutFormatOptions(0),
                                                                                        metrics: nil,
                                                                                        views: viewsDictionary)

        let view_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[scrollView]-0-|",
                                                                                        options: NSLayoutFormatOptions(0),
                                                                                        metrics: nil,
                                                                                        views: viewsDictionary)

        view.addConstraints(view_constraint_H as [AnyObject])
        view.addConstraints(view_constraint_V as [AnyObject])


        let view_constraintContainer_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[containerView]-0-|",
            options: NSLayoutFormatOptions(0),
            metrics: nil,
            views: viewsDictionary)

        let view_constraintContainer_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[containerView]-0-|",
            options: NSLayoutFormatOptions(0),
            metrics: nil,
            views: viewsDictionary)

        scrollView.addConstraints(view_constraintContainer_H as [AnyObject])
        scrollView.addConstraints(view_constraintContainer_V as [AnyObject])

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

错误:

2015-08-04 22:26:05.693 dsds[2017:56799] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) (

   "<NSLayoutConstraint:0x7a7cfc00 H:|-(0)-[UIScrollView:0x7c188200]   (Names: '|':UIView:0x7a8499d0 )>",
   "<NSLayoutConstraint:0x7a7cfe50 H:[UIScrollView:0x7c188200]-(0)-|   (Names: '|':UIView:0x7a8499d0 )>",
   "<NSAutoresizingMaskLayoutConstraint:0x7a7df310 h=--& v=--& H:[UIScrollView:0x7c188200(0)]>",
   "<NSLayoutConstraint:0x7a7d04e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7a8499d0(320)]>" )

Will attempt to recover by breaking constraint

    <NSLayoutConstraint:0x7a7cfe50 H:[UIScrollView:0x7c188200]-(0)-|  
    (Names: '|':UIView:0x7a8499d0 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in may also be helpful. 2015-08-04 22:26:05.695

dsds[2017:56799] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) (

    "<NSLayoutConstraint:0x7a7cfa00 V:|-(0)-[UIScrollView:0x7c188200]   (Names: '|':UIView:0x7a8499d0 )>",
    "<NSLayoutConstraint:0x7a7d0160 V:[UIScrollView:0x7c188200]-(0)-|   (Names: '|':UIView:0x7a8499d0 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x7a7df370 h=--& v=--& V:[UIScrollView:0x7c188200(0)]>",
    "<NSLayoutConstraint:0x7a7df920 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7a8499d0(568)]>" )

Will attempt to recover by breaking constraint

    <NSLayoutConstraint:0x7a7d0160 V:[UIScrollView:0x7c188200]-(0)-|  
    (Names: '|':UIView:0x7a8499d0 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in may also be helpful. Message from debugger: Terminated due to signal 15

救救我!!!谢谢!!!

Answer 1

阅读错误信息。它确切地告诉您问题是什么。您正在向 scrollView 添加约束，但您从未将其 translatesAutoresizingMaskIntoConstraints 设置为 false。

您可能还有其他问题，但在解决该问题之前您无法继续。