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## chmod +x this.file

#!/bin/bash

# install xcode command tool
xcode-select --install
# check
xcode-select -p

# install xcode from xcode-install

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sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.2/ /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/WatchOS.platform/DeviceSupport/6.1/ /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/DeviceSupport

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/AppleTVOS.platform/DeviceSupport/13.2/ /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/DeviceSupport

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//: Playground - noun: a place where people can play
//
// The result is not guaranteed to be accurate. Typically, the function requires 200-400 characters to reliably guess the language of a string.
// Reference: [CFStringTokenizerCopyBestStringLanguage(_:_:)](https://developer.apple.com/reference/corefoundation/1542136-cfstringtokenizercopybeststringl)
//

import Foundation

extension String {
    func guessLanguage() -> String {

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extension UIView {
    func isPossiblyVisible() -> Bool {
        guard isHidden == false,
            alpha > 0,
            bounds != .zero,
            let window = window, // In a window's view hierarchy
            window.isKeyWindow, // Does not consider cases covered by another transparent window
            window.hitTest(convert(center, to: nil), with: nil) != self
            else { return false }

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This mini guide has been moved to here.

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import StoreKit

//extension SKError: Error { } // Uncomment this line to make it throwable

func throwError() throws {
    throw SKError.unknown // Can not be thrown. Thrown error code type 'SKError.Code' does not conform to 'Error'
}

do {
    try throwError()

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App Store Review Guidelines

1. Safety

When people install an app from the App Store, they want to feel confident that it’s safe to do so—that the app doesn’t contain upsetting or offensive content, won’t damage their device, and isn’t likely to cause physical harm from its use. We’ve outlined the major pitfalls below, but if you’re looking to shock and offend people, the App Store isn’t the right place for your app.

• 1.1 Objectionable Content Apps should not include content that is offensive, insensitive, upsetting, intended to disgust, or in exceptionally poor taste. Examples of such content include:
  • 1.1.1 Defamatory, discriminatory, or mean-spirited content, including references or commentary about religion, race, sexual orientation, gender, national/ethnic origin, or other targeted groups, particularly if the app is likely to humiliate, intimidate, or place a targeted individual or group in harm’s way. Professional political satirists and humorists are generally exempt from this requirement

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# Updated for SwiftLint 0.29.2
# See all rules: https://github.com/realm/SwiftLint/blob/master/Rules.md

opt_in_rules:
# Opt-in (Default Disabled)
- anyobject_protocol
- array_init
- attributes
- closure_body_length
- closure_spacing

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// An (useless) example of Swift 4.2 @dynamicMemberLookup attributes.
// let color1 = HexColor().cbcbcb
// let color2 = HexColor().000000 // This can also be built. Will be treat as "000000"

import Foundation

@dynamicMemberLookup
struct HexColor {
    subscript(dynamicMember member: String) -> UIColor? {
        do {

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let tracker = Tracker()
// Which one do you prefer? Consider labels, indendentation, readability...
// 1 func trackEvent(_ event: Event, _ parameters: EventParameter...)
tracker.trackEvent(.viewItem,
                   .itemId("12345"),
                   .itemName("An Item"),
                   .list("List name"))

// 2. func track(event: Event, parameters: EventParameter...)
tracker.track(event: .viewItem, parameters: