今是昨非

// コマンドラインで直接確認
otool -arch arm64 -ov TestClass

// または、指定したファイルに出力します。例えばotool.txtにエクスポートします。
otool -arch arm64 -ov TestClass > otool.txt

otool -L TestClass

otool -L TestClass | grep CoreFoundation

// コマンドラインで直接確認
otool -arch arm64 -v -s __DATA __objc_classlist TestClass

// または、指定したファイルに出力します。例えばclasslist.txtにエクスポートします。
otool -arch arm64 -v -s __DATA __objc_classlist TestClass > classlist.txt

// コマンドラインで直接確認
otool -arch arm64 -v -s __DATA __objc_classrefs TestClass

// または、指定したファイルに出力します。例えばclassrefs.txtにエクスポートします。
otool -arch arm64 -v -s __DATA __objc_classrefs TestClass > classrefs.txt

// コマンドラインで直接確認
otool -arch arm64 -v -s __DATA __objc_selrefs TestClass

// または、指定したファイルに出力します。例えばselrefs.txtにエクスポートします。
otool -arch arm64 -v -s __DATA __objc_selrefs TestClass > selrefs.txt

otool -v -s __TEXT __cstring TestClass

0000000100008028 0x10000d450 // 後ろのアドレス0x10000d450はクラスの一意のアドレス
    isa        0x10000d478
    superclass 0x0 _OBJC_CLASS_$_UIViewController // 親クラス
    cache      0x0 __objc_empty_cache
    vtable     0x0
    data       0x10000c0b8
        flags          0x90
        instanceStart  8
        instanceSize   8
        reserved       0x0
        ivarLayout     0x0
        name           0x1000073cd SecondViewController // クラス名
        baseMethods    0x1000064f0
            entsize 12 (relative)
            count   1
            name    0x6ed8 (0x10000d3d0 extends past end of file)
            types   0xf6a (0x100007466 extends past end of file)
            imp     0xfffffbb8 (0x1000060b8 extends past end of file)
        baseProtocols  0x0
        ivars          0x0
        weakIvarLayout 0x0
        baseProperties 0x0

- (NSMutableDictionary *)symbolMapFromContent:(NSString *)content {
    NSMutableDictionary <NSString *,SymbolModel *>*symbolMap = [NSMutableDictionary new];
    // シンボルファイルリスト
    NSArray *lines = [content componentsSeparatedByString:@"\n"];
    
    BOOL reachFiles = NO;
    BOOL reachSymbols = NO;
    BOOL reachSections = NO;
    
    for(NSString *line in lines) {
        if([line hasPrefix:@"#"]) {
            if([line hasPrefix:@"# Object files:"])
                reachFiles = YES;
            else if ([line hasPrefix:@"# Sections:"])
                reachSections = YES;
            else if ([line hasPrefix:@"# Symbols:"])
                reachSymbols = YES;
        } else {
            if(reachFiles == YES && reachSections == NO && reachSymbols == NO) {
                NSRange range = [line rangeOfString:@"]"];
                if(range.location != NSNotFound) {
                    SymbolModel *symbol = [SymbolModel new];
                    symbol.file = [line substringFromIndex:range.location+1];
                    NSString *key = [line substringToIndex:range.location+1];
                    symbolMap[key] = symbol;
                }
            } else if (reachFiles == YES && reachSections == YES && reachSymbols == YES) {
                NSArray <NSString *>*symbolsArray = [line componentsSeparatedByString:@"\t"];
                if(symbolsArray.count == 3) {
                    NSString *fileKeyAndName = symbolsArray[2];
                    NSUInteger size = strtoul([symbolsArray[1] UTF8String], nil, 16);
                    
                    NSRange range = [fileKeyAndName rangeOfString:@"]"];
                    if(range.location != NSNotFound) {
                        NSString *key = [fileKeyAndName substringToIndex:range.location+1];
                        SymbolModel *symbol = symbolMap[key];
                        if(symbol) {
                            symbol.size += size;
                        }
                    }
                }
            }
        }
    }
    return symbolMap;
}

static NSString *kConstPrefix = @"Contents of (__DATA";
static NSString *kQueryClassList = @"__objc_classlist";

// classListのクラスを取得
- (NSMutableDictionary *)classListFromContent:(NSString *)content {
    // シンボルファイルリスト
    NSArray *lines = [content componentsSeparatedByString:@"\n"];
    
    BOOL canAddName = NO;
    
    NSMutableDictionary *classListResults = [NSMutableDictionary dictionary];

    NSString *addressStr = @"";
    BOOL classListBegin = NO;
        
    for(NSString *line in lines) {
        if([line containsString:kConstPrefix] && [line containsString:kQueryClassList]) {
            classListBegin = YES;
            continue;
        }
        else if ([line containsString:kConstPrefix]) {
            classListBegin = NO;
            break;;
        }

        if (classListBegin) {
            if([line containsString:@"000000010"]) {
                NSArray *components = [line componentsSeparatedByString:@" "];
                NSString *address = [components lastObject];
                addressStr = address;
                canAddName = YES;
            }
            else {
                if (canAddName && [line containsString:@"name"]) {
                    NSArray *components = [line componentsSeparatedByString:@" "];
                    NSString *className = [components lastObject];
                    [classListResults setValue:className forKey:addressStr];
                    addressStr = @"";
                    canAddName = NO;
                }
            }
        }
    }
    NSLog(@"__objc_classlistのまとめは以下の通りです。合計%ld個\n%@：", classListResults.count, classListResults);
    return classListResults;
}

Contents of (__DATA,__objc_classrefs) section
000000010000d410 0x0 _OBJC_CLASS_$_UIColor
000000010000d418 0x10000d450
000000010000d420 0x0 _OBJC_CLASS_$_UISceneConfiguration
000000010000d428 0x10000d568

static NSString *kConstPrefix = @"Contents of (__DATA";
static NSString *kQueryClassRefs = @"__objc_classrefs";

// classrefsを取得
- (NSArray *)classRefsFromContent:(NSString *)content {
    // シンボルファイルリスト
    NSArray *lines = [content componentsSeparatedByString:@"\n"];
    
    NSMutableArray *classRefsResults = [NSMutableArray array];

    BOOL classRefsBegin = NO;
    
    for(NSString *line in lines) {
       if ([line containsString:kConstPrefix] && [line containsString:kQueryClassRefs]) {
            classRefsBegin = YES;
            continue;
        }
        else if (classRefsBegin && [line containsString:kConstPrefix]) {
            classRefsBegin = NO;
            break;
        }
        
        if(classRefsBegin && [line containsString:@"000000010"]) {
            NSArray *components = [line componentsSeparatedByString:@" "];
            NSString *address = [components lastObject];
            if ([address hasPrefix:@"0x100"]) {
                [classRefsResults addObject:address];            }
        }
    }

    NSLog(@"\n\n__objc_refsのまとめは以下の通りです。合計%ld個\n%@：", classRefsResults.count, classRefsResults);
    return classRefsResults;
}

    // すべてのclassListクラスとクラス名
    NSDictionary *classListDic = [self classListFromContent:content];
    // すべての参照されたクラス
    NSArray *classRefs = [self classRefsFromContent:content];
//        // すべての参照された親クラス
//        NSArray *superRefs = [self superRefsFromContent:content];
    
    // まずクラスと親クラスの配列を重複排除します
    NSMutableSet *refsSet = [NSMutableSet setWithArray:classRefs];
//        [refsSet addObjectsFromArray:superRefs];
    
    // refsSetにあるすべてのものが使用済みであり、classListをループしてrefsSetに関与するクラスを削除します
    // 残ったものが余分なクラスです
    for (NSString *address in refsSet.allObjects) {
        [classListDic setValue:nil forKey:address];
    }

    // SceneDelegateやStoryboard内のクラスなど、システムクラスを削除します
    
    NSLog(@"余分なクラスは以下の通りです：%@", classListDic);

Contents of (__DATA,__objc_selrefs) section
    0x100006647 Tapped:
    0x1000067e5 application:didFinishLaunchingWithOptions:
    0x1000070f9 application:configurationForConnectingSceneSession:options:
    0x100007135 application:didDiscardSceneSessions:
    0x10000717d scene:willConnectToSession:options:
    0x1000071a1 sceneDidDisconnect:
    0x1000071b5 sceneDidBecomeActive:
    0x1000071cb sceneWillResignActive:
    0x1000071e2 sceneWillEnterForeground:
    0x1000071fc sceneDidEnterBackground:
    0x10000715a window
    0x100007161 setWindow:
    0x10000739d .cxx_destruct
    0x1000065e4 viewDidLoad
    0x1000065f0 purpleColor
    0x1000065fc view
    0x100006601 setBackgroundColor:
    0x100006615 navigationController
    0x10000662a pushViewController:animated:
    0x10000664f role
    0x100006654 initWithName:sessionRole:

static NSString *kConstPrefix = @"Contents of (__DATA";
static NSString *kQuerySelRefs = @"__objc_selrefs";

// 使用されたメソッドの集合を取得
- (NSMutableDictionary *)selRefsFromContent:(NSString *)content {
    // シンボルファイルリスト
    NSArray *lines = [content componentsSeparatedByString:@"\n"];
    
    NSMutableDictionary *selRefsResults = [NSMutableDictionary dictionary];

    BOOL selRefsBegin = NO;
    
    for(NSString *line in lines) {
       if ([line containsString:kConstPrefix] && [line containsString:kQuerySelRefs]) {
           selRefsBegin = YES;
            continue;;
        }
        else if (selRefsBegin && [line containsString:kConstPrefix]) {
            selRefsBegin = NO;
            break;
        }
        
        if(selRefsBegin) {
            NSArray *components = [line componentsSeparatedByString:@" "];
            if (components.count > 2) {
                NSString *methodName = [components lastObject];
                NSString *methodAddress = components[components.count - 2];
                [selRefsResults setValue:methodName forKey:methodAddress];
            }
        }
    }

    NSLog(@"\n\n__objc_selrefsのまとめは以下の通りです。合計%ld個\n%@：", selRefsResults.count, selRefsResults);
    return selRefsResults;
}

00000001007c1c20 0x100935c98
    isa        0x100935c70
    superclass 0x0 _OBJC_CLASS_$_NSObject
    cache      0x0 __objc_empty_cache
    vtable     0x0
    data       0x1007c4fc8
        flags          0x90
        instanceStart  8
        instanceSize   8
        reserved       0x0
        ivarLayout     0x0
        name           0x1006fb54a ColorManager
        baseMethods    0x0
        baseProtocols  0x0
        ivars          0x0
        weakIvarLayout 0x0
        baseProperties 0x0
Meta Class
    isa        0x0 _OBJC_METACLASS_$_NSObject
    superclass 0x0 _OBJC_METACLASS_$_NSObject
    cache      0x0 __objc_empty_cache
    vtable     0x0
    data       0x1007c4f80
        flags          0x91 RO_META
        instanceStart  40
        instanceSize   40
        reserved       0x0
        ivarLayout     0x0
        name           0x1006fb54a ColorManager
        baseMethods    0x1007c4f18
            entsize 24
            count   4
            name    0x100689e19 primaryTextColor
            types   0x1007038cd @16@0:8
            imp     0x100004810
            name    0x100689e2a secondaryTextColor
            types   0x1007038cd @16@0:8
            imp     0x10000482c
            name    0x100689e3d primaryTintColor
            types   0x1007038cd @16@0:8
            imp     0x100004848
            name    0x100689e4e backgroundColor
            types   0x1007038cd @16@0:8
            imp     0x100004878
        baseProtocols  0x0
        ivars          0x0
        weakIvarLayout 0x0
        baseProperties 0x0
00000001007c1c28 0x100935ce8
    isa        0x100935cc0
    superclass 0x0 _OBJC_CLASS_$_NSObject
    cache      0x0 __objc_empty_cache
    vtable     0x0
    data       0x1007c5648
        flags          0x194 RO_HAS_CXX_STRUCTORS
        instanceStart  8
        instanceSize   152
        reserved       0x0
        ivarLayout     0x1006fb56a
        layout map     0x15 0x21 0x12 
        name           0x1006fb55a SectionModel
        baseMethods    0x1007c5078
            entsize 24
            count   31
            name    0x100689eac groupName
            types   0x1007038cd @16@0:8
            imp     0x100004948
            name    0x100689eb6 setGroupName:
            types   0x1007038d5 v24@0:8@16
            imp     0x100004954
            name    0x100689ec4 name
            types   0x1007038cd @16@0:8
            imp     0x10000495c
            name    0x100689ec9 setName:
            types   0x1007038d5 v24@0:8@16
            imp     0x100004968
            name    0x100689ed2 menuId
            types   0x1007038cd @16@0:8
            imp     0x100004970
            name    0x100689ed9 setMenuId:
            types   0x1007038d5 v24@0:8@16
...

static NSString *kConstPrefix = @"Contents of (__DATA";
static NSString *kQueryClassList = @"__objc_classlist";

// すべてのメソッド集合を取得 { className:{ address: methodName } }
- (NSMutableDictionary *)allSelRefsFromContent:(NSString *)content {
    // シンボルファイルリスト
    NSArray *lines = [content componentsSeparatedByString:@"\n"];

    NSMutableDictionary *allSelResults = [NSMutableDictionary dictionary];
    
    BOOL allSelResultsBegin = NO;
    BOOL canAddName = NO;
    BOOL canAddMethods = NO;
    NSString *className = @"";
    
    NSMutableDictionary *methodDic = [NSMutableDictionary dictionary];
    
    for (NSString *line in lines) {
        if ([line containsString:kConstPrefix] && [line containsString:kQueryClassList]) {
            allSelResultsBegin = YES;
            continue;
        }
        else if (allSelResultsBegin && [line containsString:kConstPrefix]) {
            allSelResultsBegin = NO;
            break;
        }
        
        if (allSelResultsBegin) {
            if ([line containsString:@"data"]) {
                if (methodDic.count > 0) {
                    [allSelResults setValue:methodDic forKey:className];
                    methodDic = [NSMutableDictionary dictionary];
                }
                // dataの後の最初のnameはクラス名
                canAddName = YES;
                canAddMethods = NO;
                continue;
            }
            
            if (canAddName && [line containsString:@"name"]) {
                // クラス名を更新し、{ className:{ address: methodName } }の形式で保存
                NSArray *components = [line componentsSeparatedByString:@" "];
                className = [components lastObject];
                continue;
            }
            
            if ([line containsString:@"methods"] || [line containsString:@"Methods"]) {
                // methodの後のnameはメソッド名とメソッドアドレス
                canAddName = NO;
                canAddMethods = YES;
                continue;
            }
            
            if (canAddMethods && [line containsString:@"name"]) {
                NSArray *components = [line componentsSeparatedByString:@" "];
                if (components.count > 2) {
                    NSString *methodAddress = components[components.count-2];
                    NSString *methodName = [components lastObject];
                    [methodDic setValue:methodName forKey:methodAddress];
                }
                continue;
            }
        }
    }
    return allSelResults;
}

NSMutableDictionary *methodsListDic = [self allSelRefsFromContent:content];
NSMutableDictionary *selRefsDic = [self selRefsFromContent:content];

// selRefsをループしてmethodsListDicを削除し、残ったのが未使用のメソッドです
for (NSString *methodAddress in selRefsDic.allKeys) {
    for (NSDictionary *methodDic in methodsListDic.allValues) {
        [methodDic setValue:nil forKey:methodAddress];
    }
}

// 空の要素を削除します
NSMutableDictionary *resultDic = [NSMutableDictionary dictionary];
for (NSString *classNameStr in methodsListDic.allKeys) {
    NSDictionary *methodDic = [methodsListDic valueForKey:classNameStr];
    if (methodDic.count > 0) {
        [resultDic setValue:methodDic forKey:classNameStr];
    }
}

NSLog(@"余分なメソッドは以下の通りです%@", resultDic);