iOS 从Xcode中Images.xcassets导出合适的图

需求:拿到项目中的图片在别的地方使用

image.png

使用工具
下载下来cartool以后打开项目配置处理
其中Assets.car为你的Xcode项目目录中:Products->***.app->显示包内容->Assets.car

image.png

运行成功拿到

image.png

不能获取成功的处理方案
处理后的main.m

#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"];
    */
    
    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 setValue:facet forKey:@"_storageRef"];
        /* 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 won't link */
    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;
}

``