zats

import UIKit

class ViewController: UIViewController {

  private var a1: Int!
  private var a2: Int!
  private var a3: Int!
  private var a4: Int!
  private var a5: Int!
  private var a6: Int!

zats

import Foundation

// Some clearly non-NSObject-based models:

enum Coconut: String {
    case small, medium, large
}

struct Tomato {
    static var red = Tomato(color: #colorLiteral(red: 0.7490196078, green: 0.09803921569, blue: 0.02352941176, alpha: 1))

zats

target '…' do
  
end


post_install do |installer_or_rep|
  installer = installer_or_rep.respond_to?(:installer) ? installer_or_rep.installer : installer_or_rep
  installer.pods_project.build_configurations.each do |config|
    # Only in debug
    if config.name.include?("Debug")

zats

// flow controll using do-catch
do {
    try commentBody(¿commentRangeBeforeOffset(¿getNameOffset(dictionary)))
} catch let e as OptionalError {

} catch {

}

// folding into optional value. Currently produces double optional

zats

protocol PubSubMessageType {
    associatedtype Topic
    
    var topic: Topic { get }
}

protocol PubSubType {
    associatedtype Message = PubSubMessageType
    associatedtype Topic
    

zats

struct Node<T> { // error: recursive value type 'Node<T>' is not allowed
  var child: Node?
  var value: T
  
  init(value: T, child: Node? = nil) {
    self.value = value
    self.child = child
  }
}

zats

class Parent {
  var child: Child? {
    didSet {
      child.callback = weak(self)?.delegateCallback
    }
  }
  
  func delegateCallback() {
    // ...

zats

class Parent {
  var child: Child? {
    didSet {
      child.callback = delegateCallback // Fix: child.callback = weakify(self, Parent.delegateCallback) using https://github.com/klundberg/Weakify/blob/master/Weakify/Weakify.swift#L15-L21
    }
  }
  
  func delegateCallback() {
    // ...
  }

zats

Adding UIPreviewActionItem to SFSafariViewController might be a tedious task. This extansion should help.

let vc = SFSafariViewController(initialURL: url, entersReaderIfAvailable: true)
vc.previewActionItemsDelegate = self

When presenting SFSafariViewController use convenience initializer that will store original URL for later, it'll make custom action requiring original URL easier. But it's not mandatory.

Here is the delegate implementation, this is where we might want to use initialURL

func safariViewControllerPreviewActionItems(controller: SFSafariViewController) -> [UIPreviewActionItem] {

zats

- (UIView *)view {
  [self loadViewIfRequired];
  return _existingView;
}

- (void)loadViewIfNeeded {
  [self loadViewIfRequired];
}