Working with Images and Graphics

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let image = UIImage(named: "sampleImage") {
            imageView.image = image
        }
    }
}

import UIKit

let imageView = UIImageView()
imageView.image = UIImage(systemName: "heart.fill")
imageView.tintColor = .red

import UIKit

func resizeImage(_ image: UIImage, toMaxSize maxSize: CGSize) -> UIImage? {
    guard let cgImage = image.cgImage else { return nil }
    
    let imageWidth = CGFloat(cgImage.width)
    let imageHeight = CGFloat(cgImage.height)
    
    let scale = min(maxSize.width / imageWidth, maxSize.height / imageHeight)
    let newSize = CGSize(width: imageWidth * scale, height: imageHeight * scale)
    
    UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
    defer { UIGraphicsEndImageContext() }
    
    image.draw(in: CGRect(origin: .zero, size: newSize))
    
    return UIGraphicsGetImageFromCurrentImageContext()
}

// Usage
let originalImage = UIImage(named: "sample.jpg")!
let resizedImage = resizeImage(originalImage, toMaxSize: CGSize(width: 300, height: 300))

import UIKit

let image = UIImage(named: "sampleImage")!
let cropRect = CGRect(x: 50, y: 50, width: 200, height: 200)
let croppedImage = image.cgImage?.cropping(to: cropRect)
let finalImage = UIImage(cgImage: croppedImage!)

import UIKit<br>import CoreImage<br><br>class ImageFilterViewController: UIViewController {<br>&nbsp;&nbsp;@IBOutlet weak var imageView: UIImageView!<br><br>&nbsp;&nbsp;func applyBlurEffect(to image: UIImage) -> UIImage? {<br>&nbsp;&nbsp;&nbsp;&nbsp;let context = CIContext()<br>&nbsp;&nbsp;&nbsp;&nbsp;guard let ciImage = CIImage(image: image) else { return nil }<br><br>&nbsp;&nbsp;&nbsp;&nbsp;let filter = CIFilter(name: "CIGaussianBlur")<br>&nbsp;&nbsp;&nbsp;&nbsp;filter?.setValue(ciImage, forKey: kCIInputImageKey)<br>&nbsp;&nbsp;&nbsp;&nbsp;filter?.setValue(10.0, forKey: kCIInputRadiusKey)<br><br>&nbsp;&nbsp;&nbsp;&nbsp;guard let outputImage = filter?.outputImage else { return nil }<br>&nbsp;&nbsp;&nbsp;&nbsp;return UIImage(ciImage: context.createCGImage(outputImage, from: outputImage.extent)!)<br>&nbsp;&nbsp;}<br>}

import UIKit

class DrawingView: UIView {
    override func draw(_ rect: CGRect) {
        guard let context = UIGraphicsGetCurrentContext() else { return }
        
        // Set fill color
        context.setFillColor(UIColor.blue.cgColor)
        
        // Draw a rectangle
        context.fill(CGRect(x: 10, y: 10, width: 100, height: 100))
    }
}

import UIKit

let renderer = UIGraphicsImageRenderer(size: CGSize(width: 200, height: 200))
let image = renderer.image { context in
    let rect = CGRect(x: 0, y: 0, width: 200, height: 200)
    UIColor.blue.setFill()
    context.fill(rect)
    
    let circlePath = UIBezierPath(ovalIn: CGRect(x: 50, y: 50, width: 100, height: 100))
    UIColor.red.setFill()
    circlePath.fill()
}

// Use the image in an UIImageView
let imageView = UIImageView(image: image)

import UIKit

class CustomDrawingView: UIView {
    override func draw(_ rect: CGRect) {
        guard let context = UIGraphicsGetCurrentContext() else { return }
        
        // Draw a circle
        let circlePath = UIBezierPath(ovalIn: CGRect(x: 50, y: 50, width: 100, height: 100))
        UIColor.blue.setFill()
        circlePath.fill()
        
        // Draw a line
        context.move(to: CGPoint(x: 20, y: 20))
        context.addLine(to: CGPoint(x: 180, y: 180))
        context.setStrokeColor(UIColor.red.cgColor)
        context.setLineWidth(3)
        context.strokePath()
    }
}

// In your ViewController.swift
import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Load image from asset catalog
        imageView.image = UIImage(named: "customImage")
    }
}

let image = UIImage(named: "icon")
let imageAsset = UIImageAsset(named: "icon")
let darkModeImage = imageAsset.image(for: UITraitCollection(userInterfaceStyle: .dark))

import UIKit

class ImageCache {
    static let shared = ImageCache()
    private let cache = NSCache<NSString, UIImage>()

    private init() {
        cache.countLimit = 50
        cache.totalCostLimit = 100 * 1024 * 1024 // 100 MB
    }

    func image(forKey key: String) -> UIImage? {
        return cache.object(forKey: key as NSString)
    }

    func setImage(_ image: UIImage, forKey key: String) {
        cache.setObject(image, forKey: key as NSString)
    }
}

// Usage
let cachedImage = ImageCache.shared.image(forKey: "profile_123")
if let image = cachedImage {
    // Use cached image
} else {
    // Load and cache image
    ImageCache.shared.setImage(image, forKey: "profile_123")
}