如何制作水平滚动视图和其中的一些按钮（编程）

Question

抱歉，我有一个问题。我不使用storyBoard。

我想做一个这样的视图。
photo by terenceLuffy/AppStoreStyleHorizontalScrollView

但我尝试这样做。 最后，scrollView 只显示这样的最后一个按钮。

这是代码：

var scView:UIScrollView = UIScrollView()
var buttonPadding:CGFloat = 10
var xOffset:CGFloat = 10


scView.backgroundColor = UIColor.blue
scView.translatesAutoresizingMaskIntoConstraints = false


func viewDidLoad() {

for i in 0 ... 10 {

    let button = UIButton()

    button.tag = i
    button.backgroundColor = UIColor.darkGray
    button.setTitle("\(i)", for: .normal)
    button.addTarget(self, action: #selector(btnTouch), for: UIControlEvents.touchUpInside)

    button.frame = CGRect(x: xOffset, y: CGFloat(buttonPadding), width: 70, height: 30)

    xOffset = xOffset + CGFloat(buttonPadding) + button.frame.size.width
    scView.addSubview(button)


}

scView.contentSize = CGSize(width: xOffset, height: scView.frame.height)

}

请帮助我。 谢谢大家！

Answer 1

我已经尝试了您的代码并对其进行了一些更改。它按预期工作，除非您有其他事情要做：

var scView:UIScrollView!
let buttonPadding:CGFloat = 10
var xOffset:CGFloat = 10

override func viewDidLoad() {
    super.viewDidLoad()
    scView = UIScrollView(frame: CGRect(x: 0, y: 120, width: view.bounds.width, height: 50))
    view.addSubview(scView)

    scView.backgroundColor = UIColor.blue
    scView.translatesAutoresizingMaskIntoConstraints = false

    for i in 0 ... 10 {
        let button = UIButton()
        button.tag = i
        button.backgroundColor = UIColor.darkGray
        button.setTitle("\(i)", for: .normal)
        //button.addTarget(self, action: #selector(btnTouch), for: UIControlEvents.touchUpInside)

        button.frame = CGRect(x: xOffset, y: CGFloat(buttonPadding), width: 70, height: 30)

        xOffset = xOffset + CGFloat(buttonPadding) + button.frame.size.width
        scView.addSubview(button)


    }

    scView.contentSize = CGSize(width: xOffset, height: scView.frame.height)
}

Answer 2

有两种方法可以实现它:) 一种是使用 scrollView 并以编程方式在 ScrollView 上计算偏移量和设置视图作为子视图的艰难方法，否则使用 CollectionView

第 1 步：

将 UICollectionView 添加到情节提要，设置 collectionView 的高度以符合您的要求:)

第 2 步

创建一个单元格，其大小取决于您的要求。我创建了一个背景颜色为橙色/粉红色的单元格。在其上添加了一个标签以显示您的号码。

第 3 步：

将可重复使用的单元格标识符设置为单元格并设置其类:)

第 4 步：

将collectionView滚动方向设置为水平:)

第 5 步：

现在实现 collectionView 委托和数据源方法:)

extension ViewController : UICollectionViewDataSource,UICollectionViewDelegate {
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 10
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "myCell", for: indexPath) as! MyCollectionViewCell
        cell.myLabel.text = "ABCD"
        return cell;
    }
}

就是这样:)

最终的 O/P

查看带有单元格 ABCD 的 collectionView :D

其他信息

如果您在 UIViewController 上拖动 collectionView，您可能会看到 collectionView 在顶部留下了一个间隙，您可以通过取消选中 Adjust ScrollView Insets of ViewController 来解决这个问题:)

Answer 3

import UIKit

class ViewController: UIViewController {

    var imageStrings:[String] = []
     var myScrollView:UIScrollView!


    @IBOutlet weak var previewView: UIImageView!



    var scrollWidth : CGFloat = 320
    let scrollHeight : CGFloat = 100
    let thumbNailWidth : CGFloat = 80
    let thumbNailHeight : CGFloat = 80
    let padding: CGFloat = 10

    override func viewDidLoad() {
        super.viewDidLoad()

        imageStrings = ["image01","image02","image03","image04","image05","image06","image07","image08"]

        scrollWidth = self.view.frame.width

        //setup scrollView
        myScrollView = UIScrollView(frame: CGRectMake(0, self.view.frame.height - scrollHeight, scrollWidth, scrollHeight))

        //setup content size for scroll view
        let contentSizeWidth:CGFloat = (thumbNailWidth + padding) * (CGFloat(imageStrings.count))
        let contentSize = CGSize(width: contentSizeWidth ,height: thumbNailHeight)

        myScrollView.contentSize = contentSize
        myScrollView.autoresizingMask = UIViewAutoresizing.FlexibleWidth


        for(index,value) in enumerate(imageStrings) {
            var button:UIButton = UIButton.buttonWithType(.Custom) as! UIButton
            //calculate x for uibutton
            var xButton = CGFloat(padding * (CGFloat(index) + 1) + (CGFloat(index) * thumbNailWidth))
            button.frame = CGRectMake(xButton,padding, thumbNailWidth, thumbNailHeight)
            button.tag = index

            let image = UIImage(named:value)
            button.setBackgroundImage(image, forState: .Normal)
            button.addTarget(self, action: Selector("changeImage:"), forControlEvents: .TouchUpInside)

            myScrollView.addSubview(button)
        }
        previewView.image = UIImage(named: imageStrings[0])
        self.view.addSubview(myScrollView)
    }
        // Do any additional setup after loading the view, typically from a nib.


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

    func changeImage(sender:UIButton){
        let name = imageStrings[sender.tag]
        previewView.image = UIImage(named: name)
    }


}

Answer 4

    //make that variable gloabl
   let button = UIButton.init(type: .custom)
    var arrMmenu :  NSMutableArray = []
    var  selectedIndex : Int = 0
     @IBOutlet weak var btnScrollView: UIScrollView!
    var lineArray : NSMutableArray = []
    var buttonArray : NSMutableArray = []

//调用buttonCreated()

  //MARK:- Create an Horizontral LayOut
func buttonCreated()
{

    btnScrollView.contentSize.width = 0
 namesOfMenu = ["GMC","GPA","GTL"]
    var scrollwidth: CGFloat = 10.0

    for j in 0..<namesOfMenu.count
    {
        let name = namesOfMenu[j] as! String
        let size : CGSize? = name.size(withAttributes : [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 10.0)])


        let textsize = CGSize(width : CGFloat(ceilf(Float(size!.width))), height : CGFloat(ceilf(Float(size!.height))))

        var strikwidth : CGFloat = textsize.width
        strikwidth = textsize.width + 30
        let frame = CGRect(x: scrollwidth , y : CGFloat(7),width :CGFloat(strikwidth + 20) , height :CGFloat(20))
        let frameLine = CGRect(x: scrollwidth , y : CGFloat(30),width :CGFloat(strikwidth + 20) , height :CGFloat(2))
        let button = UIButton(type: .custom)
        let line = UIView()
        line.frame = frameLine
        button.tag = j
        view.tag = j
        button.frame = frame
        line .backgroundColor = UIColor.red
        button.backgroundColor = UIColor.red
        button.setTitleColor(UIColor.white, for: UIControlState.normal)
        button.layer.borderColor = UIColor.white.cgColor
        button.titleLabel?.textAlignment = .center
        button.addTarget(self, action: #selector(self.buttonEvent(_:)), for: .touchUpInside)
        button.setTitle(name, for : .normal)
        scrollwidth = scrollwidth + strikwidth + 30
        let strofMenu = namesOfMenu[selectedIndex] as! String

        if (j == selectedIndex)
        {

            if(strofMenu == "GMC")
            {
                // apicall()
            }

            line.backgroundColor = hexStringToUIColor(hex: "#3174C7")
            button.backgroundColor = UIColor.clear

            button.setTitleColor(hexStringToUIColor(hex: "#3174C7"), for: UIControlState.normal)


        }else
        {
            line.backgroundColor = UIColor.clear
            button.backgroundColor = UIColor.clear

            button.setTitleColor(MyConstant.Color.dark_gray_shade, for: UIControlState.normal)

        }
        button.titleLabel?.font =  MyConstant.fontApp.Regular

        buttonArray.add(button)

        lineArray.add(line)

        btnScrollView.addSubview(button)

        btnScrollView.addSubview(line)

    }

    btnScrollView.contentSize = CGSize(width : CGFloat(scrollwidth), height :  CGFloat(40.0))

    btnScrollView.isPagingEnabled = false

    btnScrollView.showsHorizontalScrollIndicator = false

    btnScrollView.showsVerticalScrollIndicator = false
}

//MARK:- Button Event

@objc func buttonEvent(_ sender : UIButton)

{

    let index = sender.tag

    selectedIndex = index

    let getRepoName = namesOfMenu[index] as! String

    print(getRepoName)


    for i in 0..<buttonArray.count

    {

        let buttonone : UIButton = (buttonArray[i] as! UIButton)

        let line : UIView  = (lineArray[i]) as! UIView

        if i == selectedIndex
        {
            buttonone.backgroundColor = UIColor.clear

            line.backgroundColor = hexStringToUIColor(hex: "#3174C7")

            buttonone.setTitleColor(hexStringToUIColor(hex: "#3174C7"), for: .normal)
            //
            //                if(getRepoName == "GMC")
            //                {
            //                    clickedCellIndexes.add(0)
            //
            //                    arrmutablefordata.removeAllObjects()
            //                    tblhome.reloadData()
            //                    apicall()
            //                }


            //buttonone.titleLabel
        }else
        {
            buttonone.backgroundColor = UIColor.clear

            line.backgroundColor = UIColor.clear

            buttonone.setTitleColor(MyConstant.Color.dark_gray_shade, for: .normal)

        }





    }

}

Answer 5

使用最少的情节提要很容易。你可以很容易地避免这种情况。您只需要：

1. 滚动视图
2. 水平堆栈视图
3. 如项目所示设置上述的约束
4. 按钮数量 - 需要显示的视图控制器数量。
5. 容器视图 - 这将是保存活动视图控制器的视图。

请参考这个项目的一些示例代码： https://github.com/equitronix/horizontalScrollMenu

Answer 6

使用滚动视图和堆栈视图从情节提要中执行此操作，这是一个非常简单的解决方案。连同一堆子视图控制器和转换。我已经在 GitHub 上发布了示例代码。请看这里：

https://github.com/equitronix/horizontalScrollMenu

让我知道这是否有效。