SwiftRecord

24. keyWindow

var kKeyWindow: UIWindow? {
//    if #available(iOS 13.0, *) {
//        var window: UIWindow?
//        if let cs = UIApplication.shared.connectedScenes as? Set<UIWindowScene> {
//            for windowScene in cs {
//                if windowScene.activationState == .foregroundActive {
//                    window = windowScene.windows.last
//                }
//                return window
//            }
//        }
//    }
    if #available(iOS 13.0, *) {
        let keyWindow = UIApplication.shared.connectedScenes
            .filter({$0.activationState == .foregroundActive})
            .map({$0 as? UIWindowScene})
            .compactMap({$0})
            .first?.windows
            .filter({$0.isKeyWindow}).first
        return keyWindow
    }
    
    return UIApplication.shared.keyWindow
}

 var left = 50.0
        if let kw = kKeyWindow {
            if #available(iOS 11.0, *) {
                left = kw.safeAreaInsets.left
                DebugLog(kw.safeAreaInsets)
            }
        }

var kIsPhoneX: Bool {
    if #available(iOS 11.0, *) {
        return kKeyWindow?.safeAreaInsets.bottom ?? 0.0 > 0.0
    } else {
        return false
    }
    
    
    if #available(iOS 11.0, *) {
        if let window1 = UIApplication.shared.delegate?.window, let window = window1 {
            let zero: CGFloat = 0.0
            return window.safeAreaInsets.bottom > zero
        } else {
            let isMore = UIApplication.shared.keyWindow?.safeAreaInsets.bottom ?? 0.0 > 0.0
            return isMore
        }
    }
    return false
}

23. 使用keypath

image.png

22. enum

///大头针颜色
typedef NS_ENUM(NSInteger, MAPinAnnotationColor) {
    MAPinAnnotationColorRed = 0,    ///< 红色大头针
    MAPinAnnotationColorGreen,      ///< 绿色大头针
    MAPinAnnotationColorPurple      ///< 紫色大头针
};

MAPinAnnotationColor(rawValue: index%3)!

21. 新建黑名单

fileprivate let filePath: String = {
    
    ///每个账号对应一个文件
    let doc = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last!
    let folder = "/blackList/"
    let fileName = "\(kUserInfo.userId)-blackList"
    let path = doc+folder+fileName
    
    //创建blackList文件夹
    let fileMgr = FileManager.default
    if fileMgr.fileExists(atPath: doc+folder) == false {
        do {
            try fileMgr.createDirectory(atPath: doc+folder, withIntermediateDirectories: true, attributes: nil)
            DebugLog("创建路径\( doc+folder)")
        } catch {
            DebugLog("创建路径\( doc+folder)捕捉到异常")
        }
    }
    
    DebugLog(path)
    
    return path
}()

20. 清除通知栏内所有通知消息：
    要点在于要先把BadgeNumber 设成跟当前不同的值，然后再设成0

UIApplication.shared.applicationIconBadgeNumber = 1
UIApplication.shared.applicationIconBadgeNumber = 0

19. 给键盘加按钮

override func awakeFromNib() {
    super.awakeFromNib()
    
    addToolbar()
}

fileprivate func addToolbar() {
    let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: kScreenW, height: 40.0))
    toolbar.isTranslucent = true
    toolbar.barStyle = .default
    
    let button = UIButton(frame: CGRect(x: 0, y: 0, width: 80, height: 35))
    button.setTitle("完成", for: .normal)
    button.setTitleColor(.extTheme, for: .normal)
    button.addTarget(self, action: #selector(shouKeyboard), for: .touchUpInside)
    let spaceBBI = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    //let doneBBI = UIBarButtonItem(title: "完成", style: .done, target: self, action: #selector(shouKeyboard))
    let doneBBI = UIBarButtonItem(customView: button)
    toolbar.items = [spaceBBI, doneBBI]
    tfName.inputAccessoryView = toolbar
}

@objc fileprivate func shouKeyboard() {
    tfName.resignFirstResponder()
}

1. switch判断可选类型

var age: Int? = 10

switch age {
  case let v?: //这里v进行解包 
    print(v) 
  case nil:
    print("nil")
}

等价下面的写法

if let v = age {
  print(v)
} else {
  print("nil")
}

2.case 后面匹配方法

extension String {
    static func ~= (pattern: (String) -> Bool, value: String) -> Bool {
        return pattern(value)
    }
}

func hasSuffixed(_ suffix: String) -> ((String) -> Bool) { return { $0.hasSuffix(suffix) }}
func hasPrefixed(_ prefix: String) -> ((String) -> Bool) {
//    return { $0.hasPrefix(prefix) }
    
    //等同上句
    return {
        (str: String) -> Bool in
        str.hasPrefix(prefix)
    }
}

var fn = hasPrefixed("123")
print(fn("1253456"))

var str = "123456"

switch str {
case hasPrefixed("123"), hasSuffixed("456"):
    print("has prefix 123  或者 hasSuffixed 456")
default:
    break
}

extension Int {
    static func ~= (pattern: (Int) -> Bool, value: Int) -> Bool {
        return pattern(value)
    }
}

func isEven(_ i: Int) -> Bool { return i%2 == 0 }
func isOdd(_ i: Int) -> Bool { return i%2 != 0 }

let aaaa = 11
switch aaaa {
case isEven:
    print("aaaa \(aaaa) 是偶数")
case isOdd:
    print("aaaa \(aaaa) 是奇数")
default:break
}

打印: aaaa 11 是奇数

2. 柯里化

// MARK: 柯里化 -
func add(_ v1: Int, _ v2: Int, _ v3: Int) -> Int { return v1 + v2 + v3 }
func addF(_ v: Int) -> (Int) -> Int {
    return {$0+v}
}

func minus(_ v1: Int, _ v2: Int, _ v3: Int) -> Int { return v1 - v2 - v3 }
func minusF(_ v3: Int) -> ((Int) -> ((Int) -> Int)) {
    return { v2 in
        return { v1 in
            return v1-v2-v3
        }
    }
}

prefix func ~<A, B, C, D>(_ fn: @escaping (A, B, C) -> D) -> (C) -> (B) -> (A) -> (D) {
    return { c in return { b in return { a in return fn(a, b, c)} } }
}
print((~add)(2)(3)(4), (~minus)(2)(3)(4))
 
let rsttt = minusF(12)(34)(11)
print(rsttt)

3. 为String添加扩展

struct MJ<Base> {
    var base: Base
    
    init(_ base: Base) {
        self.base = base
    }
}

//协议
protocol MJCompatible { }
extension MJCompatible {
    var mj: MJ<Self> {
        set {}
        get { return MJ(self) }
    }
    static var mj: MJ<Self>.Type {
        set {}
        get { return MJ<Self>.self }
    }
}

/*
extension String {
    var mj: MJ<String> { return MJ(self) }
    static var mj: MJ<String>.Type { return MJ<String>.self }
}

class Persons { }
extension Persons {
    var mj: MJ<Persons> { return MJ(self) }
}
 */

extension String: MJCompatible {}
extension NSString: MJCompatible {}

class Persons { }
extension Persons: MJCompatible {}

//扩展
extension MJ where Base: ExpressibleByStringLiteral {
    //计算string中数字个数
    var numberCoun: Int {
        var count = 0
        for c in base as! String where ("0"..."9").contains(c) {
            count += 1
        }
        return count
    }
    
    //类方法
    static func log() { print("MJ static log") }
}

extension MJ where Base: Persons {
    func run() { print("person run---") }
}

let pss = Persons()
print(pss.mj.run())
print("abc123".mj.numberCoun)
print(String.mj.log())

var str2: NSString = "abd12345"
print(str2.mj.numberCoun)

4. x

//是否数组
func isArray(_ value: Any) -> Bool { return value is [Any] }
print(isArray([1, "2"]))
print(isArray(NSArray()))
print(isArray("abc"))
/*
true
true
false
*/

5. snapkit使用

lbMsg.snp.makeConstraints { (make) in
    if #available(iOS 11, *) {
        make.top.equalTo(view.safeAreaLayoutGuide.snp.top).offset(0)
        make.bottom.equalTo(view.safeAreaLayoutGuide.snp.bottom).offset(0)
    } else {
        //self.topLayoutGuide.snp.top y在导航栏顶部 无导航栏在状态栏顶部
        //self.topLayoutGuide.snp.bottom y在导航栏底部 无导航栏在状态栏底部
        make.top.equalTo(self.topLayoutGuide.snp.top).offset(0)
        
        //self.bottomLayoutGuide.snp.top y在tabbar上面 无tabbar在屏幕底部
        //self.bottomLayoutGuide.snp.bottom y在tabbar下面 无tabbar在屏幕底部
        make.bottom.equalTo(self.bottomLayoutGuide.snp.top).offset(0)
    }
    make.width.equalTo(100)
    make.right.equalTo(0).labeled("标记tag")
}

[oc] tableview效果

if (@available(iOS 11, *)) {
    [UIScrollView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAlways;
} else {
    self.automaticallyAdjustsScrollViewInsets = NO;
}

cell正常显示.gif

6. 归档解档 NSKeyedArchiver & NSKeyedUnarchiver

Employee & Toy 类

import Foundation

public class Toy: NSObject, Codable, NSCoding {
    var name: String
    
    init(name: String) {
        self.name = name
    }
    
    public func encode(with aCoder: NSCoder) {
        aCoder.encode(name, forKey: "name")
    }
    
    required public init?(coder aDecoder: NSCoder) {
        self.name = aDecoder.decodeObject(forKey: "name") as! String
    }
}

public class Employee: NSObject, Codable, NSCoding {
    var name: String
    var id: Int
    var favoriteToy: Toy
    
    init(name: String, id: Int, favoriteToy: Toy) {
        self.name = name
        self.id = id
        self.favoriteToy = favoriteToy
    }

    public func encode(with aCoder: NSCoder) {
        aCoder.encode(name, forKey: "name")
        aCoder.encode(id, forKey: "id")
        aCoder.encode(favoriteToy, forKey: "favoriteToy")
    }
    
    required public init?(coder aDecoder: NSCoder) {
        self.name = aDecoder.decodeObject(forKey: "name") as! String
        self.id = aDecoder.decodeInteger(forKey: "id")
        self.favoriteToy = aDecoder.decodeObject(forKey: "favoriteToy") as! Toy
    }
}

调用

private func archiverUnarchiver() {
    let toy = Toy(name: "John-Toy")
    let employee = Employee(name: "John", id: 11, favoriteToy: toy)
    print(employee.name, employee.id, employee.favoriteToy.name)
    
    
    // NSKeyedArchiver & NSKeyedUnarchiver
    let archiverData = NSKeyedArchiver.archivedData(withRootObject: employee)
    NSKeyedArchiver().finishEncoding()
    
    //changed
    employee.name = "Jack"
    employee.id = 22
    employee.favoriteToy.name = "Jack-Toy"
    
    let ue = NSKeyedUnarchiver.unarchiveObject(with: archiverData) as! Employee
    print("now eee:", employee.name, employee.id, employee.favoriteToy.name)
    print("old eee:", ue.name, ue.id, ue.favoriteToy.name)
}
/* 打印
now eee: Jack 22 Jack-Toy
old eee: John 11 John-Toy
*/

7. json object

menu.json

{
    "menu":
    {
        "id": "file",
        "value": "File",
        "menuitem":
        [
            {
                "value": "New",
                "onclick": "CreateNewDoc()"
            },
            {
                "value": "OPen",
                "onclick": "OPenDoc()"
            },
            {
                "value": "Close",
                "onclick": "CloseDoc()"
            }
        ]
    }
}

private func json2Dic() {
    let jsonDic: [String: Any]?
    
    let path = Bundle.main.path(forResource: "menu", ofType: "json")
    
    guard let jsonData = try? Data(contentsOf: URL(fileURLWithPath: path!)) else { return  }

    //data -> dic
    do {
        jsonDic = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions.mutableContainers) as? [String : Any]
    } catch  {
        print(error)
        return
    }
    
    guard let dic: [String: Any] = jsonDic?["menu"] as? [String : Any] else { return  }
    
    //dic -> array
    guard let menuItem: [Any] = dic["menuitem"] as? [Any] else { return  }
    
    guard menuItem.count>0 else { return  }
    
    for item in menuItem {
        print(item)
    }
}

private func json2Dic1() {
    let path = Bundle.main.path(forResource: "menu", ofType: "json")
    
    if let jsonData = try? Data(contentsOf: URL(fileURLWithPath: path!)) {
        
        do {
            if let jsonObj: Dictionary<String, Any> = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions()) as? Dictionary<String, Any> {
                
                if let menuDic: Dictionary<String, Any> = jsonObj["menu"] as? Dictionary<String, Any> {
                    
                    if let menuItems: [Any] = menuDic["menuitem"] as? [Any] {
                        
                        for item in menuItems {
                            print("item: \(item)")
                        }
                    }
                }
            }
        } catch {
            print("catch error")
        }
    }
}

8. Selector & #selector

passwordTextField.addTarget(self, action: Selector(("changeText")), for: .touchUpInside)
passwordTextField.addTarget(self, action: #selector(abc), for: .touchUpInside)

@objc func abc() {}
func changeText(textField:UITextField) -> Void {}

9. Timer变量声明初始化用不了self的属性方法

image.png

10. 数组以元祖形式打印

let titles = ["11", "22", "33", "44"]
for (index, title) in titles.enumerated() {
    DebugLog("\(index):" + title)
}

11. 类型转换成String

if let code = notify.object as? String {
     loginTest(code: code)
}
            
if let code = notify.object {
     loginTest(code: code as! String)
}

12. tabBar设置图片原色、标题颜色

func setupUI() {
        ///用图片的原色
        if let items = self.tabBar.items {
            for item in items {
                item.selectedImage = item.selectedImage?.withRenderingMode(.alwaysOriginal)
            }
        }
        
        ///标题颜色 #81D8D0
        tabBar.tintColor = UIColor.extHexDecimalColor(hexadecimal: "#81D8D0")
    }

13. tableview 默认选中cell

///默认选中第一行
let indexPath = IndexPath(row: 0, section: 0)
DispatchQueue.main.asyncAfter(deadline: .now()) {
  self.tvClass.selectRow(at: indexPath, animated: false, scrollPosition: .middle)
  self.tableView(self.tvClass, didSelectRowAt: indexPath)
}

14. 全局import

在extension UIViewController扩展中

@_exported import MBProgressHUD

其它的ViewController不用import MBProgressHUD，就可以用MBProgressHUD

15. 手势介绍

16. 聊天气泡拉伸

image.png

fileprivate func stretchableImageDemo() {
    let iv = UIImageView(frame: CGRect(x: 50, y: 100, width: 200, height: 110))
    view.addSubview(iv)
    iv.backgroundColor = .extRandom
    iv.contentMode = .scaleToFill
    
    iv.image = UIImage(named: "chatSend")
    //拉伸图片
    if let image = UIImage(named: "chatSend") {
        iv.image = image.stretchableImage(withLeftCapWidth: Int(image.size.width*0.5), topCapHeight: Int(image.size.height*0.5))
    }
}

17. 定位请求权限

The app's Info.plist must contain both “NSLocationAlwaysAndWhenInUseUsageDescription” and “NSLocationWhenInUseUsageDescription” keys with string values explaining to the user how the app uses this data

18. 精确小数点后2位

///检测改变过的文本是否匹配正则表达式，如果匹配表示可以键入，否则不能键入
    func isValid(text: String) -> Bool {
        //正则表达式（只支持两位小数）
        let regex = "^\\-?([1-9]\\d*|0)(\\.\\d{0,2})?$"
        let predicte = NSPredicate(format:"SELF MATCHES %@", regex)
        return predicte.evaluate(with: text)
    }