daoseng33

extension UITextView {
  func removeTextPadding() {
    textContainer.lineFragmentPadding = 0
    textContainerInset = .zero
  }
}

daoseng33

// 移除上下的間距
textView.textContainerInset = .zero
// 移除左右的間距
textView.textContainer.lineFragmentPadding = 0

daoseng33

//
//                            _ooOoo_
//                           o8888888o
//                           88" . "88
//                           (| -_- |)
//                            O\ = /O
//                        ____/`---'\____
//                      .   ' \\| |// `.
//                       / \\||| : |||// \
//                     / _||||| -:- |||||- \

daoseng33

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    if isBeingPresented {
      // start timer
    }
  }
  
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

daoseng33

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    if isMovingToParent {
      // start timer
    }
  }

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

daoseng33

enum SectionTypes: CaseIterable {
    case header
    case list
}

print(SectionTypes.allCases.count) // 2

daoseng33

enum SectionType: Int {
    case header = 0
    case list
    
    static let count = 2
}

print(SectionType.count) // 2

daoseng33

enum SectionType: Int {
    case header = 0
    case list
    
    static let count: Int = {
        var max: Int = 0
        while let _ = SectionType(rawValue: max) { max += 1 }
        return max
    }()
}

daoseng33

static func generateQRCode(from string: String, imageView: UIImageView) -> UIImage? {
        let data = string.data(using: String.Encoding.ascii)
        
        if let filter = CIFilter(name: "CIQRCodeGenerator") {
            filter.setValue(data, forKey: "inputMessage")
            // L: 7%, M: 15%, Q: 25%, H: 30%
            filter.setValue("M", forKey: "inputCorrectionLevel")
            
            if let qrImage = filter.outputImage {
                let scaleX = imageView.frame.size.width / qrImage.extent.size.width

daoseng33

class LeftAlignedCollectionViewFlowLayout: UICollectionViewFlowLayout {

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)

        var leftMargin = sectionInset.left
        var maxY: CGFloat = -1.0
        attributes?.forEach { layoutAttribute in
            if layoutAttribute.frame.origin.y >= maxY {
                leftMargin = sectionInset.left