keith

Usage

1. swiftc main.swift -emit-module-path main.swiftmodule -emit-executable -enable-private-imports -Xfrontend -enable-implicit-dynamic
2. ./main -> prints From original bar()
3. swiftc -emit-library inject.swift -o inject.dylib -I . -Xlinker -undefined -Xlinker suppress -Xlinker -flat_namespace -Xfrontend -disable-access-control
4. DYLD_INSERT_LIBRARIES=inject.dylib ./main -> prints From replacement bar()

Notes

• Passing -Xfrontend -enable-implicit-dynamic removes you from having to add dynamic to everything you want to be replacable

keith

addmedia
addphoto
addvideo
appinfo
boot
bootstatus
clone
create
darwinup
delete

keith

• Compiler flag: -enforce-exclusivity=<value>
• Build setting: SWIFT_ENFORCE_EXCLUSIVE_ACCESS

Xcode 10.1 & Swift 4.2

• Compiler default for non optimized builds if you pass no argument is the same as if you passed checked
• Compiler default for optimized builds if you pass no argument is the same as if you passed unchecked

Configuration	Compiler Flag Value	Build Setting Description	Build Setting Value	Notes

keith

require 'spaceship'

Spaceship::Portal.login
Spaceship::Portal.select_team

Spaceship::Portal.app.all.collect do |app|
  print "Delete #{ app.bundle_id }? [y/N]: "
  delete = gets.strip.downcase == "y"
  if delete
    puts "Deleting #{ app.bundle_id }"

keith

    /// So, lets talk about AppKit. The way this function works is by passing a delegate (which is required
    /// to be a NSObject, but here is typed as Any) which turns out to be the same type as `self`, a Selector,
    /// which in this case is `_something:didSomething:soContinue:` (not kidding), and some "contextInfo"
    /// (which is actually a block). While all of these arguments appear to be optional, passing nil through
    /// to the function call that `shouldCloseSelector` defines, or passing nil to super, will cause the app
    /// to crash. So then we need to call the function on `delegate` defined by `shouldCloseSelector`.
    ///
    /// According to the documentation the function signature for this selector looks like this:
    /// - (void)document:(NSDocument *)doc shouldClose:(BOOL)shouldClose contextInfo:(void *)contextInfo
    ///

keith

#!/bin/bash

set -euo pipefail

xcrun altool --upload-app --type ios --file "path/to/foo.ipa" --username "$ITC_USER" --password "$ITC_PASSWORD"

keith

import Foundation

func set<T>(value: T, forKey key: String) {
    UserDefaults.standard.set(value, forKey: key) // this crashes because it's trying to store Optional<Date>
}

let date: Date! = Date()
set(value: date, forKey: "key")

keith

///
/// This code crashes with Swift 3.0 with optimizations enabled
/// Run with:
/// $ swift -O optimizationCrash.swift
///
extension Dictionary {
    // init(pairs: [(Key, Value)]?) { // With `(Key, Value)` this doesn't crash
    init(pairs: [Element]?) { // With `Element` this crashes with -0
        self.init()
    }

keith

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/10.0\ \(14A5309d\)
           /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

keith

Keybase proof

I hereby claim:

• I am keith on github.
• I am smileykeith (https://keybase.io/smileykeith) on keybase.
• I have a public key whose fingerprint is AC20 B263 327E 9C9A A61A 55A1 33BA 60D4 4C71 67F8

To claim this, I am signing this object: