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a:  AM/PM
 A:	0~86399999 (Millisecond of Day)
 
 c/cc:	1~7 (Day of Week)
 ccc:	Sun/Mon/Tue/Wed/Thu/Fri/Sat
 cccc:	Sunday/Monday/Tuesday/Wednesday/Thursday/Friday/Saturday
 
 d:	1~31 (0 padded Day of Month)
 D:	1~366 (0 padded Day of Year) 
 

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// setup your collectionView
private let collectionView: UICollectionView = {
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .horizontal
    layout.minimumInteritemSpacing = 20.0
    layout.minimumLineSpacing = 20.0
    // important!
    layout.itemSize = UICollectionViewFlowLayout.automaticSize
    // change estimatedItemSize for a vertical example
    layout.estimatedItemSize = CGSize(width: UIScreen.main.bounds.width, height: 40.0)

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#!/bin/bash

# Delete Archived Applications
rm -r ~/Library/Developer/Xcode/Archives/*/

# Delete Devired Data
rm -r ~/Library/Developer/Xcode/DerivedData/*/

# Delete Apple cached files
rm -r ~/Library/Developer/CoreSimulator/Caches/dyld/*/*/

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buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "${PROJECT_DIR}/${INFOPLIST_FILE}")
buildNumber=$(($buildNumber + 1))
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/${INFOPLIST_FILE}"

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run in terminal
defaults write com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes -array-add "ViewModel" "ViewController" "Coordinator" "Repository"

close Xcode and open it again.
jump by using Ctrl+Cmd+Up and Ctrl+Cmd+Down

if you want to revert the change
defaults delete com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes

ref: https://gist.github.com/danielmartin/8411c303e5c8702c19c65950b49635b8

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// camera roll folder simulator
~/Library/Developer/CoreSimulator/Devices/<device UDID>/data/Media/DCIM/100APPLE

// 
~/Library/Developer/CoreSimulator/Devices/991FCB82-FA99-4C9E-AA2A-B8A6A33034B3⁩/⁨data⁩/⁨Media⁩/⁨DCIM⁩/100APPLE⁩

// Document Directory
~/Library/Developer/CoreSimulator/Devices/991FCB82-FA99-4C9E-AA2A-B8A6A33034B3⁩/⁨⁨data⁩/Containers⁩/⁨Data⁩/Application⁩/0A893DFE-05BC-44E7-9C65-314871273441⁩/Documents⁩

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let obs1 = Observable.just(FakeObject(blood: [0,1], producers: [100,101]))
let obs2 = Observable.just(FakeObject(blood: [3,4], producers: [300,401]))
let objs = [Observable.just(obs1), Observable.just(obs2)]
        
// [Observable<Observable[FakeObject]>] to [FakeObject]
        
Observable.combineLatest(vitals)
    .flatMap { Observable.combineLatest($0) }

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// convert audio on mac for iOS
// afconvert -d [out data format] -f [out file format] [in file] [out file]

afconvert -d aac -f 'caff' -b 128000 background-music-lei.caf test_128.caf
afconvert -d aac -f 'caff' -b 32000 background-music-lei.caf test_32.caf
afconvert -d aac -f 'caff' background-music-lei.caf test_32.caf

// best formats

If space is not an issue, just encode everything with linear PCM. Not only is this the fastest way for your audio to play, but you can play multiple sounds simultaneously without running into any CPU resource issues.

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plutil -convert json Data.plist -o Data.json
plutil -convert xml1 Data.json -o Data.plist

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xcrun simctl delete unavailable