vlondon

func convertImageToGrayScale(image: UIImage) -> UIImage {
    // Create image rectangle with current image width/height
    let imageRect: CGRect = CGRectMake(0, 0, image.size.width, image.size.height)
    
    // Grayscale color space
    let colorSpace: CGColorSpaceRef = CGColorSpaceCreateDeviceGray()
    
    // Create bitmap content with current image size and grayscale colorspace
    let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.None.rawValue)
    var context = CGBitmapContextCreate(nil, UInt(image.size.width), UInt(image.size.height), 8, 0, colorSpace, bitmapInfo)

vlondon

IE 7/8/9/10/11 Virtual machines from Microsoft

Linux installation notes (tested under Ubuntu 14.04LTS/12.04LTS), assuming VirtualBox is already installed on host.

• Install notes
• Available images
  • IE7 - Vista Enterprise
  • IE8 - XP
  • IE9 - Win7
  • IE10 - Win7
  • IE10 - Win8

vlondon

let mList = "[{\"content\":\"hello\"},{\"content\":\"hi\"},{\"content\":\"how are you?\"}]"
let JSONData = mList.dataUsingEncoding(NSUTF8StringEncoding)!
var json: Array<AnyObject>!
do {
    json = try NSJSONSerialization.JSONObjectWithData(JSONData, options: NSJSONReadingOptions()) as? Array
} catch {
    print(error)
}

var resultArray = [String]()

vlondon

// Includes functions for exporting active sheet or all sheets as JSON object (also Python object syntax compatible).
// Tweak the makePrettyJSON_ function to customize what kind of JSON to export.

var FORMAT_ONELINE   = 'One-line';
var FORMAT_MULTILINE = 'Multi-line';
var FORMAT_PRETTY    = 'Pretty';

var LANGUAGE_JS      = 'JavaScript';
var LANGUAGE_PYTHON  = 'Python';

vlondon

import Foundation

// Swizzling
extension NSObject {
    
    class func swizzleMethods(origSelector: Selector, withSelector: Selector, forClass: AnyClass) {
        let originalMethod = class_getInstanceMethod(forClass, origSelector)
        let swizzledMethod = class_getInstanceMethod(forClass, withSelector)
        method_exchangeImplementations(originalMethod, swizzledMethod)

vlondon

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Title")
            Text("Subtitle")
            Text("Body")
            Spacer()
        }
    }
}

vlondon

struct ContentView: View {

    @State private var isSubtitleVisible: Bool = false

    var body: some View {
        VStack {
            Text("Title")
            if isSubtitleVisible {
                Text("Subtitle")
            } else {

vlondon

struct ContentView: View {

    @State private var isSubtitleVisible: Bool = false

    var body: some View {
        VStack {
            Text("Title")
            Text("Subtitle").isHidden(isSubtitleVisible)
            Text("Body")
            Spacer()

vlondon

import SwiftUI
import PlaygroundSupport

struct EmptyModifier: ViewModifier {

    let isEmpty: Bool

    func body(content: Content) -> some View {
        // We have to group the views or we will get an error:
        // "Function declares an opaque return type, but has no return statements in its body from which to infer an underlying type"

vlondon

#import <UIKit/UIKit.h>

@interface UIView (RoundedCorners)

- (void)setRoundedCorners:(UIRectCorner)corners radius:(CGSize)size;

@end