通过 Apple Configurator 2获取ipa资源

步骤如下：

首先在App Store中下载 Apple Configurator 2 这个软件
数据线连上手机，登录账户（APPLE ID），正常连上手机之后是这样的

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选中手机，点击添加->应用

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在应用列表中选中想获取资源的应用，选中后点击添加

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然后应用会显示在添加中，等待

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下载完毕后可能出现冲突，不用管，直接打开一个finder，快捷键shift+command+G，进入
'~/Library/Group Containers/K36BKF7T3D.group.com.apple.configurator/Library/Caches/Assets/TemporaryItems/MobileApps/',
就可以找到需要的资源的.ipa文件，⚠️注意：要拷贝出去，过一会可能会消失哦

已经存在？不用管，直接进入find，ipa包已下载.png
将.ipa改成.zip解压，解压后的层次结构如下，可以看到.app文件。直接删除.app后缀，会变成一个资源文件夹。

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.app文件中包含Assets资源、可执行文件、Framework、bundle、其他（数据库、应用启动图、应用图标、国际化资源、nib、sb、plist、json、字体...）

如何打开Assets.car文件

下载cartool
编辑scheme

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设置资源路径和解压路径

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设置好运行，不报错的话，图片资源都能正常在解压路径
如果报错。替换cartoon -> main.m 文件

//
//  main.m
//  cartool
//
//  Created by Steven Troughton-Smith on 14/07/2013.
//  Copyright (c) 2013 High Caffeine Content. All rights reserved.
//
 
#import <Foundation/Foundation.h>
 
typedef enum _kCoreThemeIdiom {
    kCoreThemeIdiomUniversal,
    kCoreThemeIdiomPhone,
    kCoreThemeIdiomPad,
    kCoreThemeIdiomTV,
    kCoreThemeIdiomCar,
    kCoreThemeIdiomWatch,
    kCoreThemeIdiomMarketing
} kCoreThemeIdiom;
 
typedef NS_ENUM(NSInteger, UIUserInterfaceSizeClass) {
    UIUserInterfaceSizeClassUnspecified = 0,
    UIUserInterfaceSizeClassCompact     = 1,
    UIUserInterfaceSizeClassRegular     = 2,
};
 
@interface CUICommonAssetStorage : NSObject
 
-(NSArray *)allAssetKeys;
-(NSArray *)allRenditionNames;
 
-(id)initWithPath:(NSString *)p;
 
-(NSString *)versionString;
 
@end
 
@interface CUINamedImage : NSObject
 
@property(readonly) CGSize size;
@property(readonly) CGFloat scale;
@property(readonly) kCoreThemeIdiom idiom;
@property(readonly) UIUserInterfaceSizeClass sizeClassHorizontal;
@property(readonly) UIUserInterfaceSizeClass sizeClassVertical;
 
-(CGImageRef)image;
 
@end
 
@interface CUIRenditionKey : NSObject
@end
 
@interface CUIThemeFacet : NSObject
 
+(CUIThemeFacet *)themeWithContentsOfURL:(NSURL *)u error:(NSError **)e;
 
@end
 
@interface CUICatalog : NSObject
 
@property(readonly) bool isVectorBased;
-(id)initWithURL:(NSURL *)URL error:(NSError **)error;
-(id)initWithName:(NSString *)n fromBundle:(NSBundle *)b;
-(id)allKeys;
-(id)allImageNames;
-(CUINamedImage *)imageWithName:(NSString *)n scaleFactor:(CGFloat)s;
-(CUINamedImage *)imageWithName:(NSString *)n scaleFactor:(CGFloat)s deviceIdiom:(int)idiom;
-(NSArray *)imagesWithName:(NSString *)n;
 
@end
 
 
 
void CGImageWriteToFile(CGImageRef image, NSString *path)
{
    CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:path];
    CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, NULL);
    CGImageDestinationAddImage(destination, image, nil);
    
    if (!CGImageDestinationFinalize(destination)) {
        NSLog(@"Failed to write image to %@", path);
    }
    
    CFRelease(destination);
}
 
NSString *idiomSuffixForCoreThemeIdiom(kCoreThemeIdiom idiom)
{
    switch (idiom) {
        case kCoreThemeIdiomUniversal:
            return @"";
            break;
        case kCoreThemeIdiomPhone:
            return @"~iphone";
            break;
        case kCoreThemeIdiomPad:
            return @"~ipad";
            break;
        case kCoreThemeIdiomTV:
            return @"~tv";
            break;
        case kCoreThemeIdiomCar:
            return @"~carplay";
            break;
        case kCoreThemeIdiomWatch:
            return @"~watch";
            break;
        case kCoreThemeIdiomMarketing:
            return @"~marketing";
            break;
        default:
            break;
    }
    
    return @"";
}
 
NSString *sizeClassSuffixForSizeClass(UIUserInterfaceSizeClass sizeClass)
{
    switch (sizeClass)
    {
        case UIUserInterfaceSizeClassCompact:
            return @"C";
            break;
        case UIUserInterfaceSizeClassRegular:
            return @"R";
            break;
        default:
            return @"A";
    }
}
 
NSMutableArray *getImagesArray(CUICatalog *catalog, NSString *key)
{
    NSMutableArray *images = [[NSMutableArray alloc] initWithCapacity:5];
 
    for (NSNumber *scaleFactor in @[@1, @2, @3])
    {
        CUINamedImage *image = [catalog imageWithName:key scaleFactor:scaleFactor.doubleValue];
 
        if (image && image.scale == scaleFactor.floatValue) [images addObject:image];
    }
 
    return images;
}
 
void exportCarFileAtPath(NSString * carPath, NSString *outputDirectoryPath)
{
    NSError *error = nil;
    
    outputDirectoryPath = [outputDirectoryPath stringByExpandingTildeInPath];
    
//    CUIThemeFacet *facet = [CUIThemeFacet themeWithContentsOfURL:[NSURL fileURLWithPath:carPath] error:&error];
//
//    CUICatalog *catalog = [[CUICatalog alloc] init];
//
//    /* Override CUICatalog to point to a file rather than a bundle */
//    [catalog setValue:facet forKey:@"_storageRef"];
    
    /* CUICommonAssetStorage won't link */
    
    
    CUICatalog *catalog = nil;
    if ([CUICatalog instancesRespondToSelector:@selector(initWithURL:error:)]) {
        /* If CUICatalog has the URL API (Mojave), use it. */
        catalog = [[CUICatalog alloc] initWithURL:[NSURL fileURLWithPath:carPath] error:&error];
    } else {
        CUIThemeFacet *facet = [CUIThemeFacet themeWithContentsOfURL:[NSURL fileURLWithPath:carPath] error:&error];
        catalog = [[CUICatalog alloc] init];
        /* Override CUICatalog to point to a file rather than a bundle */
        [catalog setValue:facet forKey:@"_storageRef"];
    }
    NSCAssert(!error, @"Error attempting to open asset catalog (%@): %@", carPath, error);
    
    CUICommonAssetStorage *storage = [[NSClassFromString(@"CUICommonAssetStorage") alloc] initWithPath:carPath];
    
    for (NSString *key in [storage allRenditionNames])
    {
        printf("%s\n", [key UTF8String]);
        
        NSArray* pathComponents = [key pathComponents];
        if (pathComponents.count > 1)
        {
            // Create subdirectories for namespaced assets (those with names like "some/namespace/image-name")
            NSArray* subdirectoryComponents = [pathComponents subarrayWithRange:NSMakeRange(0, pathComponents.count - 1)];
            
            NSString* subdirectoryPath = [outputDirectoryPath copy];
            for (NSString* pathComponent in subdirectoryComponents)
            {
                subdirectoryPath = [subdirectoryPath stringByAppendingPathComponent:pathComponent];
            }
            
            [[NSFileManager defaultManager] createDirectoryAtPath:subdirectoryPath
                                      withIntermediateDirectories:YES
                                                       attributes:nil
                                                            error:&error];
        }
        
        NSMutableArray *images = getImagesArray(catalog, key);
        for( CUINamedImage *image in images )
        {
            if( CGSizeEqualToSize(image.size, CGSizeZero) )
                printf("\tnil image?\n");
            else
            {
                CGImageRef cgImage = [image image];
                NSString *idiomSuffix = idiomSuffixForCoreThemeIdiom(image.idiom);
                
                NSString *sizeClassSuffix = @"";
                
                if (image.sizeClassHorizontal || image.sizeClassVertical)
                {
                    sizeClassSuffix = [NSString stringWithFormat:@"-%@x%@", sizeClassSuffixForSizeClass(image.sizeClassHorizontal), sizeClassSuffixForSizeClass(image.sizeClassVertical)];
                }
                
                NSString *scale = image.scale > 1.0 ? [NSString stringWithFormat:@"@%dx", (int)floor(image.scale)] : @"";
                NSString *name = [NSString stringWithFormat:@"%@%@%@%@.png", key, idiomSuffix, sizeClassSuffix, scale];
                printf("\t%s\n", [name UTF8String]);
                if( outputDirectoryPath )
                    CGImageWriteToFile(cgImage, [outputDirectoryPath stringByAppendingPathComponent:name]);
            }
        }
    }
}
 
int main(int argc, const char * argv[])
{
    @autoreleasepool {
        
        if (argc < 2)
        {
            printf("Usage: cartool <path to Assets.car> [outputDirectory]\n");
            return -1;
        }
        
        exportCarFileAtPath([NSString stringWithUTF8String:argv[1]], argc > 2 ? [NSString stringWithUTF8String:argv[2]] : nil);
    }
    return 0;
}