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        let url = Bundle.main.url(forResource: "cat1", withExtension: "jpg")!
        
        let size: CGSize = CGSize(width: 60, height: 90)
        let scale = UIScreen.main.scale
        
        // Bind the URL to the object without decoding (will not use memory yet).
        let options = [kCGImageSourceShouldCache:false] as CFDictionary
        let source = CGImageSourceCreateWithURL(url as CFURL, options)        
        
        let dimension = max(size.width, size.height) * scale

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// Run (https://github.com/wilddylan/WKWebViewWithURLProtocol)

// Be aware it is a private API, it is wisely handled and shouldn't be a prloblem at Apple's code review
[NSURLProtocol wk_registerScheme:@"http"];

//  URLProtocol.h

#import <Foundation/Foundation.h>

@interface URLProtocol : NSURLProtocol

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      GCDWebServer *_webServer = [[GCDWebServer alloc] init];

      [_webServer addDefaultHandlerForMethod:@"GET"
                                requestClass:[GCDWebServerRequest class]
                                processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {

            GCDWebServerDataResponse *response = [GCDWebServerDataResponse responseWithHTML:@"true"];
            [response setValue:@"*" forAdditionalHeader:@"Access-Control-Allow-Origin"];
            [response setValue:@"X-Requested-With, Content-Type" forAdditionalHeader:@"Access-Control-Allow-Headers"];
            [response setValue:@"GET, POST, OPTIONS" forAdditionalHeader:@"Access-Control-Allow-Methods"];

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// Do not jump to initila state after animation completed.
CATransaction.begin()
CATransaction.setValue(kCFBooleanTrue, forKey: kCATransactionDisableActions)
self.maskShape.path = toPath
CATransaction.commit()

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import Foundation

@discardableResult
func measureTime<R>(name: String = #function, body: () -> R) -> R {
    #if DEBUG
        let startTime = CACurrentMediaTime()
        let result: R = body()
        let endTime = CACurrentMediaTime()
        print("execution time of \(name): \(endTime - startTime)")
        return result

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import UIKit

extension UIView {
    func findFirstSubview(with className: String) -> UIView? {
        if String(describing: type(of: self)) == className {
            return self
        }
    
        for subview in subviews {
            if String(describing: type(of: self)) == className {

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extension UIImage {
    func gradientImage(_ colors: [UIColor]) -> UIImage? {
        guard let source = withRenderingMode(.alwaysTemplate).cgImage else {
            return nil
        }
        // Create gradient
        let cgColors = colors.map({ $0.cgColor })
        let colors = cgColors as CFArray
        let space = CGColorSpaceCreateDeviceRGB()
        guard let gradient = CGGradient(colorsSpace: space,

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#import <UIKit/UIKit.h>

@interface ApplicationDelegateProxyType ()

@property (nonnull, nonatomic) NSArray<id <UIApplicationDelegate>> *objects;

@end

@implementation ApplicationDelegateProxyType

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import UIKit

extension UIRectCorner {
    func asCornerMask() -> CACornerMask {
        var corners: CACornerMask = []
        if self.contains(.bottomRight) {
            corners.insert(.layerMaxXMaxYCorner)
        }
        if self.contains(.topRight) {
            corners.insert(.layerMaxXMinYCorner)

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require 'webrick'
require 'webrick/https'
require 'openssl'
require 'json'

# curl https://localhost:port/test (pass '-k' to accept self signed certificate)
# openssl req -x509 -newkey rsa:4096 -keyout priv.pem -out cert.pem -days 365 -nodes
# cert = OpenSSL::X509::Certificate.new File.read 'cert.pem'
# pkey = OpenSSL::PKey::RSA.new File.read 'priv.pem'