今是昨非

// 直接在命令行查看
otool -arch arm64 -ov TestClass

// 或者輸出對應信息到指定檔案，比如導出到otool.txt
otool -arch arm64 -ov TestClass > otool.txt

otool -L TestClass

otool -L TestClass | grep CoreFoundation

// 直接在命令行查看
otool -arch arm64 -v -s __DATA __objc_classlist TestClass

// 或者輸出對應信息到指定檔案，比如導出到classlist.txt
otool -arch arm64 -v -s __DATA __objc_classlist TestClass > classlist.txt

// 直接在命令行查看
otool -arch arm64 -v -s __DATA __objc_classrefs TestClass

// 或者輸出對應信息到指定檔案，比如導出到classrefs.txt
otool -arch arm64 -v -s __DATA __objc_classrefs TestClass > classrefs.txt

// 直接在命令行查看
otool -arch arm64 -v -s __DATA __objc_selrefs TestClass

// 或者輸出對應信息到指定檔案，比如導出到classrefs.txt
otool -arch arm64 -v -s __DATA __objc_selrefs TestClass > selrefs.txt

otool -v -s __TEXT __cstring TestClass

0000000100008028 0x10000d450 // 後面的地址0x10000d450，是class的唯一地址
    isa        0x10000d478
    superclass 0x0 _OBJC_CLASS_$_UIViewController // 父類
    cache      0x0 __objc_empty_cache
    vtable     0x0
    data       0x10000c0b8
        flags          0x90
        instanceStart  8
        instanceSize   8
        reserved       0x0
        ivarLayout     0x0
        name           0x1000073cd SecondViewController // 類名
        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];
    // 符號檔案列表
    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";

// 獲取classList的類
- (NSMutableDictionary *)classListFromContent:(NSString *)content {
    // 符號檔案列表
    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總結如下，共有%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";

// 獲取classrefs
- (NSArray *)classRefsFromContent:(NSString *)content {
    // 符號檔案列表
    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總結如下，共有%ld個\n%@：", classRefsResults.count, classRefsResults);
    return classRefsResults;
}

    // 所有classList類和類名字
    NSDictionary *classListDic = [self classListFromContent:content];
    // 所有引用的類
    NSArray *classRefs = [self classRefsFromContent:content];
//        // 所有引用的父類
//        NSArray *superRefs = [self superRefsFromContent:content];
    
    // 先把類和父類數組做去重
    NSMutableSet *refsSet = [NSMutableSet setWithArray:classRefs];
//        [refsSet addObjectsFromArray:superRefs];
    
    // 所有在refsSet中的都是已使用的，遍歷classList，移除refsSet中涉及的類
    // 餘下的就是多餘的類
    for (NSString *address in refsSet.allObjects) {
        [classListDic setValue:nil forKey:address];
    }

    // 移除系統類，比如SceneDelegate，或者Storyboard中的類
    
    NSLog(@"多餘的類如下：%@", 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";

// 獲取已使用的方法集合
- (NSMutableDictionary *)selRefsFromContent:(NSString *)content {
    // 符號檔案列表
    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總結如下，共有%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";

// 獲取所有方法集合 { className:{ address: methodName } }
- (NSMutableDictionary *)allSelRefsFromContent:(NSString *)content {
    // 符號檔案列表
    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之後第一個的name，是類名
                canAddName = YES;
                canAddMethods = NO;
                continue;
            }
            
            if (canAddName && [line containsString:@"name"]) {
                // 更新類名，用作標記{ className:{ address: methodName } }
                NSArray *components = [line componentsSeparatedByString:@" "];
                className = [components lastObject];
                continue;
            }
            
            if ([line containsString:@"methods"] || [line containsString:@"Methods"]) {
                // method之後的name是方法名，和方法地址
                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];

// 遍歷selRefs移除methodsListDic，剩下的就是未使用的
for (NSString *methodAddress in selRefsDic.allKeys) {
    for (NSDictionary *methodDic in methodsListDic.allValues) {
        [methodDic setValue:nil forKey:methodAddress];
    }
}

// 遍歷移除空的元素
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(@"多餘的方法如下%@", resultDic);