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let json = ["type": 1]

if let typeNumber = json["type"] {
    imageView.image = Type(rawValue: typeNumber)?.image
}

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enum Type: String {
    // 直接指定 API 回傳的 String
    case regular = "regular"
    case system = "system"
    case advertise = "advertise"
    
    var image: UIImage? {
        // 一行搞定
        return UIImage(named: self.rawValue)
    }

daoseng33

// I dont want my table jumping/animation when appending new rows
// for an infinite scroll feel
//
// Some of this might not be needed but it works
//
// TODO: Possibly garbage

extension UITableView {
  func reloadDataSmoothly() {
    UIView.setAnimationsEnabled(false)

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import Foundation

protocol Convertable: Codable {
    
}

// Convert struct to dictionary
extension Convertable {
    func convertToDict() -> Dictionary<String, Any>? {
        var dict: Dictionary<String, Any>? = nil

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struct User: Convertable {
    let name: String
    let phone: String
}

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if let userDict = User.convertToDict() {
    // Do something you want with dict 
}

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// Set up the shape of the circle 
CAShapeLayer *border = [CAShapeLayer layer];
border.path = [UIBezierPath bezierPathWithRoundedRect:self.myImageView.frame cornerRadius:self.myImageView.frame.size.height/2].CGPath; 
border.anchorPoint = CGPointMake(0.5, 0.5); 
border.position= CGPointMake(self.myImageView.bounds.origin.x, self.myImageView.bounds.origin.y); 
border.fillColor = [UIColor clearColor].CGColor; 
border.strokeColor = [UIColor blueColor].CGColor; 
border.lineWidth = 5; [self.view.layer addSublayer:border]; 
// Configure animation 
// draw Border 

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@IBAction func textFieldDidChange(_ sender: UITextField) {
    if let text = sender.text {
        let uppercase = text.uppercased()
        sender.text = uppercase
    }
}

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// Draw dotted line
let viewBorder = CAShapeLayer()
viewBorder.lineDashPattern = [2, 2]
viewBorder.frame = myView.bounds
viewBorder.fillColor = nil
viewBorder.path = UIBezierPath(rect: myView.bounds).cgPath
myView.layer.addSublayer(viewBorder)

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inputTextField.addTarget(self, action: #selector(textFieldDidChange(_:)) , for: UIControlEvents.editingChanged)

@objc func textFieldDidChange(_ textField: UITextField) {
       // text field did change
}