Swift5 踩過的坑和奇怪的API筆記-有解無憂

踩過的坑和奇怪的API筆記

- UINavigationController 導航欄
- - - - 設定導航欄顏色
      - 去掉導航欄下面的分割線
      - 設定導航欄字體和字體顏色
- UITabBar
- - - - UITabBar和導航欄結合使用
      - 獲取UITabBar的高度
      - 跳轉界面隱藏UITabBar的方案
- UITableView
- - - - UITableViewCell里點擊事件不生效
      - 設定分割線內邊距
      - 隱藏所有分割線分割線
      - 隱藏底部多余行及分割線
- UICollectionView & UIScrollView
- - - - cell里的按鈕區域只能點擊無法滑動
      - 允許多選
      - ScrollView是否顯示滑動條
      - ScrollView使ContentSize小于UIScrollView大小也能滑動
      - ScrollView分頁滑動
      - UIScrollView截長圖
- UIView
- - - - 截圖
      - 拼接圖片
      - 獲取當前UIView的UIVIewController
- UIImage
- - - - 重設圖片大小和等比例縮放
      - 裁切圖片
      - 獲取純色UIImage
      - 改變顏色
      - 獲取網路圖片
- UIButton
- - - - UIButton中圖片和文字的位置變換
- UIColor & Color
- - - - UIColor 十六進制
      - Color 十六進制
- CGRect
- - - - CGRect等比例縮放
- 點擊事件不生效可能的原因
- Date
- - - - 獲取農歷日期
      - 當前月有多少天
      - 今天是今年第幾天
      - 本周是今年第幾周
- String
- - - - sha256
      - unicode
      - urlEncoded
      - Base64
- Dictionary
- - - - 合并字典
- Application
- - - - 手機真實寬高（px)
      - 設計寬高
      - 手機序列號(唯一標識)
      - 手機別名：用戶定義的名稱
      - 設備名稱
      - 手機系統版本
      - 手機型號
      - 地方型號（國際化區域名稱）
      - 是否是IPad

UINavigationController 導航欄

設定導航欄顏色

	navigationController?.navigationBar.barTintColor =  .blue

去掉導航欄下面的分割線

	navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
	navigationController?.navigationBar.shadowImage = UIImage()

此時導航欄顏色和View背景相同，應該類似吧導航欄設定透明了的效果
使用方法一設定導航欄顏色為.clear 并不能達到相同效果
本方法會導致方法一設定導航欄顏色失效,此時使用以下代碼設定導航欄顏色

	navigationController?.navigationBar.backgroundColor = .orange

設定導航欄字體和字體顏色

	self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor:UIColor.black,NSAttributedString.Key.font : UIFont.systemFont(ofSize: 25)]

UITabBar

UITabBar和導航欄結合使用

	tabBarCtrl = UITabBarController()
    tabBarCtrl.tabBar.tintColor = .DesignGreen
    let view1 = ViewHome()
    view1.tabBarItem.image = UIImage(named: "xiaozujian")
    view1.tabBarItem.title = "組件"   
    let view2 = ViewIcon()
    view2.tabBarItem.image = UIImage(named: "tubiao")
    view2.tabBarItem.title = "圖示"

    let view1 = UINavigationController.init(rootViewController: viewHome)
    let view2 = UINavigationController.init(rootViewController: viewIcon)
    tabBarCtrl.addChild(view1)
    tabBarCtrl.addChild(view2)
    tabBarCtrl.selectedIndex = 0 //默認選擇
    self.window?.rootViewController = tabBarCtrl
    window?.makeKeyAndVisible()

獲取UITabBar的高度

let height = tabBarCtrl.tabBar.bounds.size.height

跳轉界面隱藏UITabBar的方案

	override func viewWillDisappear(_ animated: Bool) {
        tabBarCtrl.tabBar.isHidden = true
    }

UITableView

UITableViewCell里點擊事件不生效

使用 cell.contentView.addSubview 代替 cell.addSubview

設定分割線內邊距

	tableView.separatorInset = UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)

隱藏所有分割線分割線

方法一：

	self.separatorStyle = .none

方法二：

	tableView.separatorInset = UIEdgeInsets(top: 0, left: tableView.frame.width, bottom: 0, right: 0)

隱藏底部多余行及分割線

	tableview.tableFooterView = UIView(frame: CGRect.zero)

UICollectionView & UIScrollView

cell里的按鈕區域只能點擊無法滑動

使用`UILabel`或`UIImageView`等系結`UITapGestureRecognizer`  代替`UIButton`

	func InitUI(){
		let img = UIImageView(frame:CGRect(xxxxxx))
	    let singleTapGesture = UITapGestureRecognizer(target: self, action: #selector(ClickBtn(_:)))
	    img.addGestureRecognizer(singleTapGesture)
	    img.isUserInteractionEnabled = true
    }
	@objc func ClickBtn(_ tap:UITapGestureRecognizer){
        
    }

允許多選

 	collection.allowsMultipleSelection = true

ScrollView是否顯示滑動條

	scrollView.showsHorizontalScrollIndicator = false
	scrollView.showsVerticalScrollIndicator = false

ScrollView使ContentSize小于UIScrollView大小也能滑動

   scrollView.alwaysBounceVertical = true
   scrollView.alwaysBounceHorizontal = true

ScrollView分頁滑動

	func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        if (!decelerate)
        {
            scrollView.setContentOffset(CGPoint(x: CGFloat(Int(scrollView.contentOffset.x/pageWidth + 0.5))*pageWidth, y: scrollView.contentOffset.y), animated: true)
            selectPage = Int(scrollView.contentOffset.x/pageWidth + 0.5)
        }
    }
    func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView) {
        scrollView.setContentOffset(CGPoint(x: CGFloat(Int(scrollView.contentOffset.x/pageWidth + 0.5))*pageWidth, y: scrollView.contentOffset.y), animated: true)
        selectPage = Int(scrollView.contentOffset.x/pageWidth + 0.5)
    }

UIScrollView截長圖

///截長圖
	extension UIScrollView {
    /// 截長屏Image
    var captureLongImage: UIImage? {
        
        var image: UIImage? = nil
        let savedContentOffset:CGPoint? = contentOffset
        let savedFrame:CGRect? = frame
        
        contentOffset = .zero
        frame = CGRect(x: 0, y: 0,
                       width: contentSize.width,
                       height: contentSize.height)
        UIGraphicsBeginImageContextWithOptions(
            CGSize(width: frame.size.width,
                   height: frame.size.height),
            false,
            0.0)
        layer.render(in: UIGraphicsGetCurrentContext()!)
        image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        
        contentOffset = savedContentOffset ?? contentOffset
        frame = savedFrame ?? frame
        return image
        
    }
    
    fileprivate func writeImageToAlbum(_ image: UIImage) {
            
            UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(image:didFinishSavingWithError:contextInfo:)), nil)
    }
        
    @objc fileprivate func image(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafeRawPointer) {
            if let _ = error as NSError? {
                print("保存失敗，請重試")
            } else {
                print("保存成功！")
            }
    }
    
}

UIView

截圖

	extension UIView {
    /// 截屏Image
    	func captureImage(size:CGSize)-> UIImage? {
        
	        // 引數①：截屏區域  引數②：是否透明  引數③：清晰度
	        UIGraphicsBeginImageContextWithOptions(frame.size, false, 0.0)
	        layer.render(in: UIGraphicsGetCurrentContext()!)
	        let image = UIGraphicsGetImageFromCurrentImageContext()
	        
	        UIGraphicsEndImageContext()
	        return image
	    }
	    
	     func captureImageInPos( rect: CGRect) -> UIImage? {
	      UIGraphicsBeginImageContext(rect.size)
	      guard let context = UIGraphicsGetCurrentContext() else { return nil }
	      context.translateBy(x: -rect.minX, y: -rect.minY)
	        self.draw(.zero)
	      let croppedImage = UIGraphicsGetImageFromCurrentImageContext()
	      UIGraphicsEndImageContext()
	      return croppedImage
    	}
	}

拼接圖片

	//拼接圖片
	func combinTwoImage(image1:UIImage,image2:UIImage) -> UIImage
	{
	    let width = max(image1.size.width, image2.size.width)
	    let height = image1.size.height + image2.size.height
	    let offScreenSize = CGSize.init(width: width, height: height)
	    
	    
	    UIGraphicsBeginImageContextWithOptions(offScreenSize, false, 0.0)
	    let rect = CGRect.init(x:0, y:0, width:width, height:image1.size.height)
	    image1.draw(in: rect)
	    
	    let rect2 = CGRect.init(x:0, y:image1.size.height, width:width, height:image2.size.height)
	    image2.draw(in: rect2)
	    
	    let image:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
	    
	    UIGraphicsEndImageContext();
	    
	    return image;
	}

獲取當前UIView的UIVIewController

	extension UIView{
		func ParentCtrl()->UIViewController{
	       var vc:UIResponder = self
	       while vc.isKind(of: UIViewController.self) != true {
	           vc = vc.next!
	       }
	       return vc as! UIViewController
		}
	}

UIImage

重設圖片大小和等比例縮放

	extension UIImage {
	    /**
	     *  重設圖片大小
	     */
	    func  reSizeImage(reSize: CGSize )-> UIImage  {
	        //UIGraphicsBeginImageContext(reSize);
	        UIGraphicsBeginImageContextWithOptions (reSize, false , UIScreen .main.scale);
	        //繪制圖片
	        self.draw(in: CGRect(x: 0,
	                              y: 0,
	                              width: reSize.width,
	                              height: reSize.height))
	        let  reSizeImage: UIImage  =  UIGraphicsGetImageFromCurrentImageContext ()!
	        UIGraphicsEndImageContext ();
	        return  reSizeImage;
	    }
	    
	    /**
	     *  等比率縮放
	     */
	    func  scaleImage(scaleSize: CGFloat )-> UIImage  {
	        let  reSize = CGSize(width: self .size.width * scaleSize, height: self .size.height * scaleSize)  
	        return  reSizeImage(reSize: reSize)
	    }
    }

裁切圖片

	extension UIImage{
	    func crop(_ rect: CGRect) -> UIImage? {
	        let img = self.reSizeImage(reSize: UIScreen.main.currentMode!.size)
	        var newRect = rect
	        let WIDTH:CGFloat = UIScreen.main.bounds.width
			let RELWIDTH = UIScreen.main.currentMode?.size.width

	        let scale = (RELWIDTH!/WIDTH)
	        newRect.origin.x *=  scale*scale
	        newRect.origin.y *= scale*scale
	        newRect.size.width *= scale*scale
	        newRect.size.height *= scale*scale
	        
	        guard let imageRef = img.cgImage?.cropping(to: newRect) else { return nil }
	        return UIImage(cgImage: imageRef)
	    }
	}

獲取純色UIImage

	extension UIImage {
	    convenience init?(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) {
	        let rect = CGRect(origin: .zero, size: size)
	        UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
	        color.setFill()
	        UIRectFill(rect)
	        let image = UIGraphicsGetImageFromCurrentImageContext()
	        UIGraphicsEndImageContext()
	
	        guard let cgImage = image?.cgImage else { return nil }
	        self.init(cgImage: cgImage)
	    }
	}

改變顏色

	extension UIImage {
		func changeColor(color:UIColor) -> UIImage {
		           UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
		           let context = UIGraphicsGetCurrentContext()
		           context?.translateBy(x: 0, y: self.size.height)
		           context?.scaleBy(x: 1.0, y: -1.0)//kCGBlendModeNormal
		           context?.setBlendMode(.normal)
		           let rect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
		           context?.clip(to: rect, mask: self.cgImage!);
		           color.setFill()
		           context?.fill(rect)
		           let newImage = UIGraphicsGetImageFromCurrentImageContext()
		           UIGraphicsEndImageContext()
		           return newImage!
		       }
       }

獲取網路圖片

	func GetImgByUrl(path:String)->UIImage{
	    
	    let url = NSURL(string: path)!
	
	    let data = NSData(contentsOf: url as URL)!
	
	    return UIImage(data: data as Data,scale: 1.0)!
	}

UIButton

UIButton中圖片和文字的位置變換

	enum ButtonEdgeInsetsStyle {
	   case ButtonEdgeInsetsStyleTop // image在上，label在下
	   case ButtonEdgeInsetsStyleLeft  // image在左，label在右
	   case ButtonEdgeInsetsStyleBottom  // image在下，label在上
	   case ButtonEdgeInsetsStyleRight // image在右，label在左
	}
	extension UIButton {
	    func layoutButtonEdgeInsets(style:ButtonEdgeInsetsStyle,space:CGFloat) {
	        let labelWidth : CGFloat = self.titleLabel?.frame.size.height ?? 36
	        let labelHeight : CGFloat = self.titleLabel?.frame.size.width ?? 20
	        var imageEdgeInset = UIEdgeInsets.zero
	        var labelEdgeInset = UIEdgeInsets.zero
	      let imageWith = self.imageView?.frame.size.width
	      let imageHeight = self.imageView?.frame.size.height
	
	      switch style {
	      case .ButtonEdgeInsetsStyleTop:
	        imageEdgeInset = UIEdgeInsets(top: -labelHeight-space/2.0, left: (bounds.width - imageWith!)/2, bottom: 0, right: 0)
	        labelEdgeInset = UIEdgeInsets(top: 0, left: -imageWith!, bottom: -imageHeight!-space/2.0, right: 0)
	      case .ButtonEdgeInsetsStyleLeft:
	        imageEdgeInset = UIEdgeInsets(top: 0, left: -space/2.0, bottom: 0, right: space/2.0);
	        labelEdgeInset = UIEdgeInsets(top: 0, left: space/2.0, bottom: 0, right: -space/2.0);
	      case .ButtonEdgeInsetsStyleBottom:
	        imageEdgeInset = UIEdgeInsets(top: 0, left: 0, bottom: -labelHeight-space/2.0, right: -labelWidth)
	        labelEdgeInset = UIEdgeInsets(top: -imageHeight!-space/2.0, left: -imageWith!, bottom: 0, right: 0)
	      case .ButtonEdgeInsetsStyleRight:
	          // To Do print("坐標是====\(labelWidth)=====\(space)")
	        imageEdgeInset = UIEdgeInsets(top: 0, left: labelWidth+space/2.0, bottom: 0, right: -labelWidth-space/2.0)
	        labelEdgeInset = UIEdgeInsets(top: 0, left: -imageWith!-space/2.0, bottom: 0, right: imageWith!+space/2.0)
	      }
	      self.titleEdgeInsets = labelEdgeInset
	      self.imageEdgeInsets = imageEdgeInset
	  }
	}

UIColor & Color

UIColor 十六進制

	extension UIColor{
	    convenience init(hex: Int, alpha: CGFloat = 1){
	        let components = (
	            R: CGFloat((hex >> 16) & 0xff) / 255,
	            G: CGFloat((hex >> 08) & 0xff) / 255,
	            B: CGFloat((hex >> 00) & 0xff) / 255
	        )
	        self.init(
	            red: components.R,
	            green: components.G,
	            blue: components.B,
	            alpha: alpha
	        )
	        
	    }
    }

Color 十六進制

	extension Color {
	    init(hex: Int, alpha: Double = 1) {
	        let components = (
	            R: Double((hex >> 16) & 0xff) / 255,
	            G: Double((hex >> 08) & 0xff) / 255,
	            B: Double((hex >> 00) & 0xff) / 255
	        )
	        self.init(
	            .sRGB,
	            red: components.R,
	            green: components.G,
	            blue: components.B,
	            opacity: alpha
	        )
	    }
    }

CGRect

CGRect等比例縮放

	extension CGRect{  
	    init(x:CGFloat,y:CGFloat,w:CGFloat,h:CGFloat,scale:CGFloat){
	        self.init(x: x*scale, y: y*scale, width: w*scale, height: h*scale)
	    }
	}

點擊事件不生效可能的原因

部分控制元件默認用戶互動式關閉的，需要手動打開，UIView或父級View的isUserInteractionEnabled為false view.isUserInteractionEnabled = true
當前點擊的UIView或區域超出了父級View的范圍，
當前點擊的UIView或區域被其他透明View覆寫
UITableViewCell里點擊事件不生效，使用 cell.contentView.addSubview 代替 cell.addSubview

Date

獲取農歷日期

	extension Date{
		static var ChineseDate: String{
		        //設定農歷日歷
		        let chinese = Calendar(identifier: .chinese)
		        let formatter = DateFormatter()
		        formatter.locale = Locale(identifier: "zh_CN")
		        formatter.calendar = chinese
		        //日期樣式
		        formatter.dateStyle = .long
		        //公歷轉為農歷
		        let str = formatter.string(from: Date())
		        return   String(str.dropFirst(4))
		    }
    }

當前月有多少天

	extension Date{
		static var DayCountOfMonth:Int{
	        
	        let ca = Calendar.init(identifier: .gregorian)
	        var lastMonthComps = DateComponents()
	        lastMonthComps.month = 0
	        let curDate = ca.date(byAdding: lastMonthComps, to: Date())
	        
	        var interval:Double = 0
	        var firstDate:Date = Date()
	        var lastDate :Date = Date()
	        
	        let calendar = NSCalendar.current
	        let bl = calendar.dateInterval(of: .month, start: &firstDate, interval: &interval, for: curDate!)
	        
	        if bl {
	            lastDate = firstDate.addingTimeInterval(interval-1)
	        }
	        let day = Calendar.current.component(.day, from: lastDate);
	        return day
	    }
	}

今天是今年第幾天

	extension Date{
		static var dayOfYear:Int{
		        let from = Calendar.current.dateComponents([.year], from: Date())
		        return (Calendar.current.dateComponents([.day], from: Calendar.current.date(from: from)!,to: Date()).day ?? 0) + 1  
		    }
	}

本周是今年第幾周

	extension Date{
		static var weekOfYear:Int{
	        return Calendar.current.component(.weekOfYear, from: Date())
	    }
	}

String

sha256

	extension String {
	    func sha256() -> String{
	        if let stringData = self.data(using: String.Encoding.utf8) {
	            return hexStringFromData(input: digest(input: stringData as NSData))
	        }
	        return ""
	        
	    }
	    
	    private  func hexStringFromData(input: NSData) -> String {
	        var bytes = [UInt8](repeating: 0, count: input.length)
	        input.getBytes(&bytes, length: input.length)
	        var hexString = ""
	        for byte in bytes {
	            hexString += String(format:"%02x", UInt8(byte))
	            
	        }
	        return hexString
	        
	    }
	    private func digest(input : NSData) -> NSData {
	        let digestLength = Int(CC_SHA256_DIGEST_LENGTH)
	        var hash = [UInt8](repeating: 0, count: digestLength)
	        CC_SHA256(input.bytes, UInt32(input.length), &hash)
	        return NSData(bytes: hash, length: digestLength)
	        
	    }
	    
	}

unicode

	extension String {
	    var unicodeStr:String {
	        let tempStr1 = self.replacingOccurrences(of: "\\u", with: "\\U")
	        let tempStr2 = tempStr1.replacingOccurrences(of: "\"", with: "\\\"")
	        let tempStr3 = "\"".appending(tempStr2).appending("\"")
	        let tempData = tempStr3.data(using: String.Encoding.utf8)
	        var returnStr:String = ""
	        do {
	            returnStr = try PropertyListSerialization.propertyList(from: tempData!, options: [.mutableContainers], format: nil) as! String
	        } catch {
	            print(error)
	        }
	        return returnStr.replacingOccurrences(of: "\\r\\n", with: "\n")
	    }
	    
	    var unicode:String{
	        var str = ""
	        for scalar in self.unicodeScalars {
	            str = str + "\\u\(String(scalar.value, radix: 16))"
	        }
	        return str
	    }
	}

urlEncoded

	extension String {
	    //將原始的url編碼為合法的url
	    func urlEncoded() -> String {
	        let encodeUrlString = self.addingPercentEncoding(withAllowedCharacters:
	            .urlQueryAllowed)
	        return encodeUrlString ?? ""
	    }
	     
	    //將編碼后的url轉換回原始的url
	    func urlDecoded() -> String {
	        return self.removingPercentEncoding ?? ""
	    }
	}

Base64

	extension String {
	    //Base64編碼
	    func encodBase64() -> String?{
	        let strData = self.data(using: String.Encoding.utf8)
	        let base64String = strData?.base64EncodedString(options: NSData.Base64EncodingOptions.init(rawValue: 0))
	        
	        return base64String
	    }
	    //Base64解碼
	    func decodeBase64() -> String?{
	        let decodedData = NSData(base64Encoded: self, options: NSData.Base64DecodingOptions.init(rawValue: 0))
	        let decodedString = NSString(data: decodedData! as Data, encoding: String.Encoding.utf8.rawValue) as String?
	        return decodedString
	    }
	}

Dictionary

合并字典

	extension Dictionary {
	    public func deepMerged(with other: [Key: Value]) -> [Key: Value] {
	        var result: [Key: Value] = self
	        for (key, value) in other {
	            if let value = value as? [Key: Value], let existing = result[key] as? [Key: Value] {
	                result[key] = (existing.deepMerged(with: value) as! Value)
	            } else {
	                result[key] = value
	            }
	        }
	        return result
	    }
	}

Application

手機真實寬高（px)

let RELWIDTH = UIScreen.main.currentMode?.size.width
let RELHEIGHT = UIScreen.main.currentMode?.size.height

設計寬高

let WIDTH:CGFloat = UIScreen.main.bounds.width let HEIGHT:CGFloat = UIScreen.main.bounds.height

手機序列號(唯一標識)

UIDevice.current.identifierForVendor?.uuidString

手機別名：用戶定義的名稱

UIDevice.current.name

設備名稱

UIDevice.current.systemName

手機系統版本

UIDevice.current.systemVersion

手機型號

UIDevice.current.model

地方型號（國際化區域名稱）

UIDevice.current.localizedModel

是否是IPad

UIDevice.current.userInterfaceIdiom == .pad

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Swift5 踩過的坑和奇怪的API筆記