这一编是俺之前OC版的翻译版本，不过做做了一些新功能的扩展，新功能如下：
1.标签支持自适应文本宽度
2.点击标签文本时，标签文本的滚动列表会跟着一起滑动
3.底部指示线宽度自适应上面标签文本宽度
4.将可滑动的标题栏与不可滑动的标题栏结合到一个接口中
设计思路与前一个版本一致，各位道友请移步查看详细的思路，
IOS 高仿boss直聘---优雅使用UIButton与UIScrollView打造滑动标签
这里只奉上源码与效果图：
效果图如下：
源码部分：
import UIKit
protocol ScrollNavBarChangeListener {
func onChangeListener(index : Int) -> Void
}
/// 带标签滑动的滚动视图
class ScrollNavBar: UIView {
var delegate : ScrollNavBarChangeListener?
lazy var bottomLine : UIView = UIView.init()
lazy var titleList : Array = Array<String>()
lazy var btnList : Array = Array<UIButton>()
lazy var titleScrollView : UIScrollView = UIScrollView.init()
lazy var moveAnimation : CABasicAnimation = {(make) in
let tmpAnim = CABasicAnimation.init(keyPath: "position")
return tmpAnim
}()
var nLastIndex : Int = 0
lazy var segmentScroll : UIScrollView = UIScrollView.init()
var finalPos : CGPoint = CGPoint.zero
var screenSize : CGRect = CGRect.zero
var bIsTitleScroll : Bool = false
lazy var averageItemWidth : CGFloat = 0
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
/// 初始标题栏
///
/// - Parameters:
/// - titles: 标题列表
/// - isScroll: 标题栏是否可滑动开关,这个开关在这里主要是控制底部下划线宽度与滚动列表横向滚动的尺寸
func initTitle(titles : Array<String>,isScroll : Bool) {
if titles.isEmpty {
return
}
self.bIsTitleScroll = isScroll
screenSize = UIScreen.main.bounds
self.titleList = titles
//创建标题滚动视图
titleScrollView.frame = CGRect.init(x: 0, y: 20, width: screenSize.width, height: 42)
titleScrollView.alwaysBounceHorizontal = true
titleScrollView.showsHorizontalScrollIndicator = false
titleScrollView.backgroundColor = UIColor.init(red: 66.0 / 255.0, green: 133.0 / 255.0, blue: 236.0 / 255.0, alpha: 1.0)
self.addSubview(titleScrollView)
if !isScroll{
averageItemWidth = titleScrollView.frame.width / CGFloat(titles.count)
}
var offsetX : CGFloat = 0
var contentSize : CGFloat = 0
for (idx,title) in self.titleList.enumerated(){
if isScroll{
if idx == 0{
offsetX = 0
}else{
offsetX = self.btnList[idx - 1].frame.size.width + self.btnList[idx - 1].frame.origin.x
}
}
let button : UIButton = UIButton.init(frame:CGRect.init(x: CGFloat(idx) * averageItemWidth, y: 0, width: averageItemWidth, height: 40))
button.tag = idx
button.addTarget(self, action: #selector(onClickListener(btn:)), for:.touchUpInside)
button.setTitle(title, for: UIControlState.normal)
button.titleLabel?.font = UIFont.systemFont(ofSize: 12)
button.setTitleColor(UIColor.white, for: .normal)
if isScroll{
let tmpWidth : CGFloat = UIButton.getWidthWithTitle(title: title, font: UIFont.systemFont(ofSize: 12)) + 20
button.frame = CGRect.init(x: offsetX, y: 0, width: tmpWidth, height: 40)
contentSize += tmpWidth
}
titleScrollView.addSubview(button)
self.btnList.append(button)
}
if isScroll{
titleScrollView.contentSize = CGSize.init(width:contentSize, height: 42)
}else{
titleScrollView.contentSize = CGSize.init(width:CGFloat(titles.count) * averageItemWidth, height: 42)
}
//创建底部线条
let lineRect : CGRect = CGRect.init(x: 0,
y: 40,
width: isScroll == true ? self.btnList[0].frame.size.width : averageItemWidth,
height: 1.5)
bottomLine.frame = lineRect
bottomLine.backgroundColor = UIColor.white
titleScrollView.addSubview(bottomLine)
}
func initSegmentView(views : Array<Any>) {
if views.count == 0 {
return
}
self.segmentScroll = UIScrollView.init(frame:CGRect.init(x: 0, y: 62.5, width: screenSize.width, height: screenSize.height))
self.segmentScroll.contentSize = CGSize.init(width: screenSize.width * CGFloat(views.count), height: screenSize.height)
self.segmentScroll.alwaysBounceHorizontal = true
self.segmentScroll.isPagingEnabled = true
self.addSubview(self.segmentScroll)
self.segmentScroll.addObserver(self, forKeyPath: "contentOffset", options: [.new,.old], context: nil)
for (idx, layout) in views.enumerated(){
if(idx > views.count){
break
}
self.segmentScroll.addSubview(layout as! UIView)
}
}
func onClickListener(btn : UIButton?) {
if (delegate != nil) {
delegate?.onChangeListener(index: btn!.tag)
}
self.segmentScroll.scrollRectToVisible(CGRect.init(x: CGFloat(btn!.tag) * self.segmentScroll.frame.width,
y: self.segmentScroll.frame.origin.y,
width: self.segmentScroll.frame.width,
height: self.segmentScroll.frame.height),
animated: true)
let lastItemWidth : CGFloat = self.btnList[self.nLastIndex].frame.width
let curItemWidth : CGFloat = self.btnList[btn!.tag].frame.width
var fromValue : NSValue?
var toValue : NSValue?
if self.bIsTitleScroll{
fromValue = NSValue.init(cgPoint: CGPoint.init(x: self.btnList[self.nLastIndex].frame.origin.x + 0.5 * lastItemWidth,
y: 40))
toValue = NSValue.init(cgPoint: CGPoint.init(x: self.btnList[btn!.tag].frame.origin.x + 0.5 * curItemWidth,
y: 40))
}else{
fromValue = NSValue.init(cgPoint: CGPoint.init(x: CGFloat(self.nLastIndex) * averageItemWidth + 0.5 * averageItemWidth,
y: 40))
toValue = NSValue.init(cgPoint: CGPoint.init(x: CGFloat(btn!.tag) * averageItemWidth + 0.5 * averageItemWidth,
y: 40))
}
startLineMoveAnimFromValue(fromValue: fromValue!, toValue: toValue!, duration: 0.3)
titleLabelMoveLogic(curBtnIdx: btn!.tag)
self.nLastIndex = btn!.tag
updateTitleBtnStatus(idx: btn!.tag)
guard self.bIsTitleScroll == true else {
self.finalPos = CGPoint.init(x : CGFloat(btn!.tag) * averageItemWidth + 0.5 * averageItemWidth, y : 40)
return
}
self.finalPos = CGPoint.init(x:curItemWidth + 0.5 * curItemWidth, y: 40)
}
/// 处理标签滑动逻辑：
/// - Parameters:
/// - curBtnIdx: 点击的当前标签
/// 对于可以滑动，需要重新调整可见视图
func titleLabelMoveLogic(curBtnIdx : Int) {
if !self.bIsTitleScroll {return}
self.titleScrollView.scrollRectToVisible(CGRect.init(x: self.btnList[curBtnIdx].frame.origin.x,
y: 0,
width: self.titleScrollView.frame.size.width,
height: self.titleScrollView.frame.size.height),
animated: true)
}
func updateTitleBtnStatus(idx : Int){
for(index, button) in self.btnList.enumerated(){
if idx == index {
button.setTitleColor(UIColor.init(red: 118 / 255, green: 198 / 255, blue: 192 / 255, alpha: 1.0), for: .normal)
}else {
button.setTitleColor(UIColor.white, for: .normal)
}
}
if self.bIsTitleScroll { //对于标题栏可以滑动，需要重新调整底部下划线的宽度
resetBottomLineWidth(idx: idx)
}
}
/// 调整顶部标签的宽度:主要根据点击的按钮宽度来更新标签的宽度
///
/// - Parameter idx: 宽度id 因为按钮id与其在列表中索引一致，所以可以直接用id作索引
func resetBottomLineWidth(idx : Int) {
let btnWidth : CGFloat = self.btnList[idx].frame.width
bottomLine.frame = CGRect.init(x: bottomLine.frame.origin.x, y: bottomLine.frame.origin.y, width: btnWidth, height: bottomLine.frame.size.height)
}
func startLineMoveAnimFromValue(fromValue : Any, toValue : Any, duration:CFTimeInterval) {
moveAnimation.fromValue = fromValue
moveAnimation.toValue = toValue
moveAnimation.delegate = self as CAAnimationDelegate
moveAnimation.isRemovedOnCompletion = false
moveAnimation.fillMode = kCAFillModeForwards
moveAnimation.duration = duration
bottomLine.layer.removeAllAnimations()
bottomLine.layer.add(moveAnimation, forKey: "onStart")
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
let newPos : CGPoint = change?[NSKeyValueChangeKey.newKey] as! CGPoint
self.nLastIndex = Int(newPos.x / self.segmentScroll.frame.width);
self.bottomLine.layer.removeAllAnimations()
if self.bIsTitleScroll{
self.bottomLine.frame = CGRect.init(x: self.btnList[self.nLastIndex].frame.origin.x,
y: self.bottomLine.frame.origin.y,
width: 0,
height: 1.5)
}else{
var frame : CGRect = self.bottomLine.frame
frame.origin.x = CGFloat(self.nLastIndex) * averageItemWidth
self.bottomLine.frame = frame;
}
self.bottomLine.layoutIfNeeded()
titleLabelMoveLogic(curBtnIdx: self.nLastIndex)
updateTitleBtnStatus(idx: self.nLastIndex)
}
deinit{
self.segmentScroll.removeObserver(self, forKeyPath: "contentOffset")
}
}
extension ScrollNavBar : ScrollNavBarChangeListener,CAAnimationDelegate{
func onChangeListener(index: Int) {
}
func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
if bottomLine.layer.animationKeys()?.last == "onStart" {
var frame : CGRect = bottomLine.frame
frame.origin.x = finalPos.x
bottomLine.frame = frame
}
}
}
按钮自适应使用扩展的方式：
import UIKit
// MARK: - 本类主要处理按钮随文本宽度自适应
extension UIButton{
/**
类方法，根据宽度，计算高度
@param width 输入宽度
@param title 文本内容
@param font 字体属性
@return 计算后的高度
*/
class func getHeightByWidth(width : CGFloat, title : String, font : UIFont) -> CGFloat{
let button : UIButton = UIButton.init(frame: CGRect.init(x: 0, y: 0, width: width, height: 0))
button.setTitle(title, for: .normal)
button.titleLabel?.font = font
button.sizeToFit()
button.titleLabel?.numberOfLines = 0
return button.frame.size.height
}
/**
根据文本内容计算宽度
@param title 文本内容
@param font 字体属性
@return 计算后的宽度
*/
class func getWidthWithTitle(title : String, font : UIFont) -> CGFloat{
// UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 0)];
// label.text = title;
// label.font = font;
// [label sizeToFit];
// return label.frame.size.width;
let button : UIButton = UIButton.init(frame: CGRect.init(x: 0, y: 0, width: 0, height: 0))
button.setTitle(title, for: .normal)
button.titleLabel?.font = font
button.sizeToFit()
return button.frame.size.width
}
}
在vc中使用可滑动方式：
import UIKit
class WatchVC: BaseVC {
lazy var topNavBar : ScrollNavBar = {[unowned self]() -> ScrollNavBar in
let tmpView : ScrollNavBar = ScrollNavBar.init(frame: CGRect.init(x : 0,
y : 0,
width : self.getScreenSize().size.width,
height : self.getScreenSize().size.height))
return tmpView
}()
override func viewDidLoad() {
initView()
}
func initView(){
let titles : [String] = ["视频","资讯","趣味图集","小说","娱乐","热点","体育",
"财经","军事","汽车","时尚"]
topNavBar.initTitle(titles: titles,isScroll: true)
self.view.addSubview(topNavBar)
let view1 : UIView = UIView.init(frame: CGRect.init(x: 0, y: 0, width: self.getScreenSize().size.width, height: self.getScreenSize().size.height))
view1.backgroundColor = UIColor.blue
let view2 : UIView = UIView.init(frame: CGRect.init(x: self.getScreenSize().size.width, y: 0, width: self.getScreenSize().size.width, height: self.getScreenSize().size.height))
view2.backgroundColor = UIColor.orange
let view3 : UIView = UIView.init(frame: CGRect.init(x: self.getScreenSize().size.width * 2, y: 0, width: self.getScreenSize().size.width, height: self.getScreenSize().size.height))
view3.backgroundColor = UIColor.yellow
let view4 : UIView = UIView.init(frame: CGRect.init(x: self.getScreenSize().size.width * 3, y: 0, width: self.getScreenSize().size.width, height: self.getScreenSize().size.height))
view4.backgroundColor = UIColor.blue
let views : [UIView] = [view1,view2,view3,view4]
topNavBar.initSegmentView(views: views)
}
}
欢迎交流一起学习：