IMG_0179.PNG
HistoryView：
1、布局热门搜索和历史搜索
2、动态计算文本的frame，区分换行和不换行
3、触发事件传递到viewModel，并接收回调更新UI
SearchView:
1、布局搜索框和右侧搜索按钮
2、触发事件传递到viewModel
SearchViewModel：
1、跟踪view的时间，处理historyArr数据
2、公开属性和方法让view保持最新状态
存储历史搜索记录到缓存,可用NSUserDefault、归档、plist、sqlite等，此处采用的是UserDefault
完整代码为
ViewController.swift
class ViewController: UIViewController {
var viewModel = SearchViewModel()
lazy var searchv: SearchView = {
let search = SearchView(frame: CGRect(x: 0, y: 0, width: kscreenw, height: kNavBarH))
search.backgroundColor = .orange
return search
}()
lazy var historyv: HistoryView = {
let history = HistoryView(frame: CGRect(x: 0, y: kNavBarH, width: kscreenw, height: kscreenh-kNavBarH))
history.backgroundColor = .white
return history
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.backgroundColor = .white
view.addSubview(searchv)
view.addSubview(historyv)
searchv.viewModel = viewModel
historyv.viewModel = viewModel
weak var weakself = self
viewModel.searchHistoryBlock = {
searchStr in
print("搜索的内容",searchStr)
weakself?.navigationController?.pushViewController(SecViewController(), animated: true)
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(true, animated: false)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.setNavigationBarHidden(false, animated: false)
viewModel.saveHistoryArr()
}
override func touchesBegan(_ touches: Set, with event: UIEvent?) {
view.endEditing(true)
}
}
SearchView.swift
class SearchView: UIView,UITextFieldDelegate {
var viewModel:SearchViewModel?
//闭包传值
var returnSearchContent : ((String)->())?
lazy var textfield: UITextField = {
let tfield = UITextField.init(frame: CGRect(x: 30, y: kSafeHeightTopBar+0.5*(kNavBarH-kSafeHeightTopBar-30), width: kscreenw-120, height: 30))
tfield.backgroundColor = .white
tfield.placeholder = "请输入搜索内容"
tfield.layer.cornerRadius = 0.5*30
tfield.layer.masksToBounds = true
tfield.font = .systemFont(ofSize: 14)
tfield.returnKeyType = .search
tfield.delegate = self
tfield.clearButtonMode = .whileEditing
let leftv = UIView(frame: CGRect(x: 0, y:0, width: 10, height: 30))
tfield.leftView = leftv
tfield.leftViewMode = .always
return tfield
}()
lazy var searchBtn : UIButton = {
let btn = UIButton()
btn.frame = CGRect(x: kscreenw-60, y: kSafeHeightTopBar, width: 40, height: kNavBarH-kSafeHeightTopBar)
btn.setTitle("搜索", for: .normal)
btn.setTitleColor(.white, for: .normal)
btn.addTarget(self, action: #selector(searchBtnTap(btn:)), for: .touchUpInside)
return btn
}()
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(textfield)
addSubview(searchBtn)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
/*
搜索按钮点击
*/
@objc func searchBtnTap(btn: UIButton) {
textfield.resignFirstResponder()
viewModel?.startSearch(text: textfield.text ?? "")
}
//点击键盘搜索时调用
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textfield.resignFirstResponder()
viewModel?.startSearch(text: textfield.text ?? "")
return true
}
}
HistoryView.swift
class HistoryView: UIView {
lazy var hotLabel: UILabel = {
let label = UILabel(frame: CGRect(x: 20, y: 30, width: 100, height: 40))
label.text = "热门搜索"
label.textColor = .colorWithHexString(color: "333333")
label.font = .systemFont(ofSize: 15)
return label
}()
let hotView = UIView()
lazy var hisLabel: UILabel = {
let label = UILabel()
label.text = "历史搜索"
label.textColor = .colorWithHexString(color: "333333")
label.font = .systemFont(ofSize: 15)
return label
}()
lazy var deletBtn : UIButton = {
let btn = UIButton()
btn.setImage(.init(named: "delet"), for: .normal)
btn.addTarget(self, action: #selector(deletHistory), for: .touchUpInside)
return btn
}()
let historyv = UIView()
private var temModel = SearchViewModel()
var viewModel:SearchViewModel{
set {
temModel = newValue
weak var weakself = self
temModel.updateHistoryV = {
() in
weakself?.updateHistoryView()
}
}
get {
temModel
}
}
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(hotLabel)
addSubview(hotView)
//添加热门搜索
let hotArr = ["桂花","紫薇花","月季","玫瑰","茉莉花","紫茉莉","锦带花","长春花","梅花"]
let temheight = addLabelWithArr(bgView: hotView, arr: hotArr, tag: 1000)
hotView.frame = CGRect(x: 0, y: hotLabel.frame.maxY+10, width: kscreenw, height: temheight)
hisLabel.frame = CGRect(x: 20, y: hotView.frame.maxY+10, width: 100, height: 40)
deletBtn.frame = CGRect(x: kscreenw-60, y: hisLabel.frame.origin.y, width: 40, height: 40)
//历史搜索
addSubview(hisLabel)
addSubview(deletBtn)
addSubview(historyv)
historyv.frame = CGRect(x: 0, y: hisLabel.frame.maxY+10, width: kscreenw, height: 0)
updateHistoryView()
}
func updateHistoryView() {
for label in historyv.subviews {
if label.tag == 1001 {
label.removeFromSuperview()
}
}
let historyh = addLabelWithArr(bgView: historyv, arr: viewModel.historyArr, tag: 1001)
historyv.frame = CGRect(x: 0, y: hisLabel.frame.maxY+10, width: kscreenw, height: historyh)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func addLabelWithArr(bgView: UIView, arr: [String], tag: Int) -> CGFloat{
if arr.count < 1 {
return 0
}
var orgSize = CGSize(width: 20, height: 0)
for i in 0.. CGSize{
let strSize = text?.getStringSize(font: font, viewSize: CGSize(width: kscreenw-40, height: CGFloat(MAXFLOAT)))
let orW = size.width
var labelw: CGFloat = 0
if let wid = strSize?.width {
labelw = wid + 20
}
let spaceX: CGFloat = 20
let spaceY: CGFloat = 10
let labelh: CGFloat = 26
var newSize = CGSize.zero
if orW+labelw > kscreenw-40 {
//换行
frame = CGRect(x: spaceX, y: size.height+labelh+spaceY, width: labelw, height: labelh)
//2*spaceX+labelw代表换行后label左侧间距spacex+右侧间距也是spaxex+labelw
newSize = CGSize(width: 2*spaceX+labelw, height: size.height+labelh+spaceY)
}else {
frame = CGRect(x: orW, y: size.height, width: labelw, height: labelh)
newSize = CGSize(width: orW+spaceX+labelw, height: size.height)
}
return newSize
}
}
private extension String {
//获取文字的宽高
func getStringSize(font: UIFont, viewSize: CGSize) -> CGSize {
let rect = self.boundingRect(with: viewSize, options: [.usesLineFragmentOrigin,.truncatesLastVisibleLine,.usesFontLeading], attributes: [NSAttributedString.Key.font: font], context: nil)
return rect.size
}
}
SearchViewModel.swift
class SearchViewModel: NSObject {
private let maxHistoryLength: Int = 10//根据需求设置最多展示历史记录总数
//获取之前的历史记录,搜索文本时调用
lazy var historyArr: [String] = {
if var temhistoryArr = UserDefaults.standard.object(forKey: "historyArrDefault") as? [String] {
return temhistoryArr
}
return [String]()
}()
var searchHistoryBlock: ((String)->())?
var updateHistoryV: (()->())? //刷新historyView
func startSearch(text: String?){
if let str = text,str.count > 0 {
//判断是否有重复的，有则移除以前的
if historyArr.contains(str) {
historyArr.removeAll{
$0 == str
}
}
//大于限制，移除最后一条
if historyArr.count > maxHistoryLength-1 {
historyArr.removeLast()
}
//新增
historyArr.insert(str, at: 0)
updateHistoryV?()
searchHistoryBlock?(str)
}
}
//当前页面即将消失，存储历史搜索记录到缓存,可用NSUserDefault、归档、plist、splite等
func saveHistoryArr() {
UserDefaults.standard.set(historyArr, forKey: "historyArrDefault")
UserDefaults.standard.synchronize()
}
//清空历史记录
func clearhistory() {
historyArr = [String]()
saveHistoryArr()
updateHistoryV?()
}
}
demo地址：
https://github.com/loveGithubs/history