iOS App Size Optimization: Binary'den Asset'e Her Byte Önemli

1# Archive yap
2xcodebuild -scheme MyApp -archivePath MyApp.xcarchive archive
3 
4# Export with app thinning report
5xcodebuild -exportArchive \
6  -archivePath MyApp.xcarchive \
7  -exportPath ./Export \
8  -exportOptionsPlist ExportOptions.plist

1# Binary'nin segment dağılımını gör
2size -l -m MyApp.app/MyApp
3 
4# Symbol bilgisi
5nm -S MyApp.app/MyApp | sort -k 2 -r | head -50

1# PNG optimization
2pngquant --quality=65-80 --speed 1 --output optimized.png original.png
3 
4# WebP conversion (iOS 14+)
5cwebp -q 80 image.png -o image.webp
6 
7# JPEG optimization  
8jpegoptim --max=80 --strip-all image.jpg

1// Build Settings
2DEAD_CODE_STRIPPING = YES
3STRIP_INSTALLED_PRODUCT = YES
4 
5// Swift-specific
6SWIFT_OPTIMIZATION_LEVEL = -Osize  // Release için
7 
8// Link-Time Optimization
9LLVM_LTO = YES

1// Build Settings
2STRIP_STYLE = all  // Release için
3DEBUG_INFORMATION_FORMAT = dwarf-with-dsym

1// ❌ Her generic kullanımı binary'de duplicate oluşturur
2func process<T: Numeric>(_ value: T) -> T {
3    return value * 2
4}
5 
6// ✅ Protocol-based yaklaşım
7protocol Processable {
8    static func process(_ value: Self) -> Self
9}

1// Build Settings
2ENABLE_BITCODE = YES

1class LevelManager {
2    private var resourceRequest: NSBundleResourceRequest?
3    
4    func loadLevel(_ levelTag: String) async throws -> LevelData {
5        // Önce cache'i kontrol et
6        if Bundle.main.preservationPriority(forTag: levelTag) > 0.5 {
7            return try loadLocalLevel(levelTag)
8        }
9        
10        // İndir
11        let request = NSBundleResourceRequest(tags: [levelTag])
12        self.resourceRequest = request
13        
14        try await request.beginAccessingResources()
15        
16        let levelData = try loadLocalLevel(levelTag)
17        
18        // Cache priority ayarla
19        Bundle.main.setPreservationPriority(0.8, forTags: [levelTag])
20        
21        return levelData
22    }
23    
24    func unloadLevel(_ levelTag: String) {
25        resourceRequest?.endAccessingResources()
26        resourceRequest = nil
27        Bundle.main.setPreservationPriority(0.0, forTags: [levelTag])
28    }
29}

1# Podfile
2use_frameworks! :linkage => :static  # Static linking

1// Optimization
2SWIFT_OPTIMIZATION_LEVEL = -Osize
3GCC_OPTIMIZATION_LEVEL = s
4 
5// Dead Code
6DEAD_CODE_STRIPPING = YES
7STRIP_INSTALLED_PRODUCT = YES
8STRIP_STYLE = all
9COPY_PHASE_STRIP = YES
10 
11// Link-Time Optimization
12LLVM_LTO = YES
13 
14// Bitcode
15ENABLE_BITCODE = YES
16 
17// Asset Optimization
18ASSETCATALOG_COMPILER_OPTIMIZATION = space
19 
20// Swift
21SWIFT_COMPILATION_MODE = wholemodule

1# CI/CD size check
2- name: Check Size Limit
3  run: |
4    SIZE=$(stat -f%z Export/MyApp.ipa)
5    MAX_SIZE=200000000  # 200 MB
6    if [ $SIZE -gt $MAX_SIZE ]; then
7      echo "App size exceeds limit!"
8      exit 1
9    fi

1# Her SPM dependency'nin binary'ye etkisini ölç
2# 1. Tüm bağımlılıklar dahil build
3xcodebuild -scheme MyApp -configuration Release build
4FULL_SIZE=$(stat -f%z Build/Products/Release-iphoneos/MyApp.app/MyApp)
5 
6# 2. Şüpheli paketi kaldır, tekrar build et
7# Package.swift'ten paketi comment'le
8xcodebuild -scheme MyApp -configuration Release clean build
9REDUCED_SIZE=$(stat -f%z Build/Products/Release-iphoneos/MyApp.app/MyApp)
10 
11# 3. Farkı hesapla
12echo "Package impact: $(( (FULL_SIZE - REDUCED_SIZE) / 1024 )) KB"

1// ❌ Alamofire (1.2 MB binary impact) - basit API call'lar için overkill
2import Alamofire
3AF.request("https://api.example.com/data").responseDecodable(of: MyModel.self) { response in
4    // ...
5}
6 
7// ✅ Native URLSession extension (50 KB) - aynı iş, minimal overhead
8extension URLSession {
9    func decode<T: Decodable>(
10        _ type: T.Type,
11        from url: URL
12    ) async throws -> T {
13        let (data, response) = try await self.data(from: url)
14        guard let httpResponse = response as? HTTPURLResponse,
15              (200...299).contains(httpResponse.statusCode) else {
16            throw URLError(.badServerResponse)
17        }
18        return try JSONDecoder().decode(T.self, from: data)
19    }
20}
21 
22// Kullanım
23let data = try await URLSession.shared.decode(MyModel.self, from: apiURL)

1#!/bin/bash
2# Tüm PNG asset'leri WebP'ye toplu dönüştür
3ASSET_DIR="./Assets.xcassets"
4SAVINGS=0
5 
6find "$ASSET_DIR" -name "*.png" -type f | while read file; do
7    PNG_SIZE=$(stat -f%z "$file")
8    WEBP_FILE="$(echo "$file" | sed 's/.png$//').webp"
9 
10    cwebp -q 80 -m 6 "$file" -o "$WEBP_FILE" 2>/dev/null
11    WEBP_SIZE=$(stat -f%z "$WEBP_FILE")
12 
13    SAVED=$(( (PNG_SIZE - WEBP_SIZE) / 1024 ))
14    echo "$(basename "$file"): $SAVED KB saved"
15    SAVINGS=$(( SAVINGS + SAVED ))
16done
17 
18echo "Toplam tasarruf: $SAVINGS KB"