Lancewer

class func getCategories() -> (categoryDict:[String:Any], level1CateArray:[String]) {
	var categoriesDict:[String:Any] = [:]
    var level1Categories:[String] = []

    if let path = Bundle.main.path(forResource: "Category", ofType: "plist") {
        let rawData = try! Data(contentsOf: URL(fileURLWithPath: path))
        if let categoryDict = try! PropertyListSerialization.propertyList(from: rawData, format: nil) as? [String:Any] {
            categoriesDict = categoryDict
            for k in categoryDict.keys {
                level1Categories.append(k)

Lancewer

let cellTitle:NSString = "string to calculate"
var autoSize = cellTitle.size(withAttributes: [NSAttributedStringKey.font:UIFont.systemFont(ofSize: 17.0)])

Lancewer

#This simple snippet shows how to add a subview to superview's center.

Lancewer

// The Pan Gesture
func createPanGestureRecognizer(targetView: UIImageView) {
    var panGesture = UIPanGestureRecognizer(target: self, action:#selector(handlePanGesture(_:)))
    targetView.addGestureRecognizer(panGesture)
}

@objc func handlePanGesture(panGesture: UIPanGestureRecognizer) {
    // get translation
    let translation = panGesture.translation(in: view)
    // This line is reset translation point to zero, let the next translation base on

Lancewer

let briefInfoFetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "ClothItem")
briefInfoFetchRequest.resultType = .dictionaryResultType
briefInfoFetchRequest.returnsObjectsAsFaults = false

let desc = NSExpressionDescription()
desc.name = "mainPhoto"
desc.expression = NSExpression(forKeyPath: "mainPhotoURLString")
desc.isStoredInExternalRecord = true
desc.expressionResultType = .stringAttributeType

Lancewer

let itemIDsFetchRequest = NSFetchRequest<NSManagedObjectID>(entityName: "ClothItem")
	itemIDsFetchRequest.resultType = .managedObjectIDResultType
do {
    let ids = try managedContext!.fetch(itemIDsFetchRequest)
    print(ids.first!.uriRepresentation().absoluteString)
}catch let error as NSError {
	print("Fetch item failed:\(error), \(error.userInfo)")
}

Lancewer

//You can drag a tapGestureRecongizer to the very bottom view, and link a IBAction like below to it 
@IBAction func closeAllKeyborad(_ sender: Any) {
    view.endEditing(true)
}

Lancewer

//custom cell class

import UIKit

class CollectionViewCell: UICollectionViewCell {
    @IBOutlet weak var nameLabel: UILabel!
    
    override var isSelected: Bool{
        didSet(newValue){
            contentView.backgroundColor = newValue ? UIColor.green : UIColor.white

Lancewer

func setupTabBarItem(){
        var defaultIconImage = UIImage(named: "035")
        if let image = defaultIconImage {
            defaultIconImage = image.withRenderingMode(.alwaysOriginal) //Keep image render model original is important!
        }
        
        var selectedIconImage = UIImage(named: "020")
        if let image = selectedIconImage {
            selectedIconImage = image.withRenderingMode(.alwaysOriginal)
        }

Lancewer

@IBAction func addName(_ sender: Any) {
        let alert = UIAlertController(title: "New Name", message: "Add a new name", preferredStyle: .alert)
        let saveAction = UIAlertAction(title: "Save", style: .default) { 
          [unowned self] action in
            guard let textField = alert.textFields?.first,
                let nameToSave = textField.text else {
                    return
            }
            self.names.append(nameToSave)
            self.tableView.reloadData()