Question

我是新手并且首先尝试解压缩文件，我想解压缩我的数据库包含文件并从中复制数据库为此我尝试像

在我的DBManager.m文件中，我写作

@interface DBManager()

@property (nonatomic, strong) NSString *documentsDirectory;

@property (nonatomic, strong) NSString *databaseFilename;

@property (nonatomic, strong) NSMutableArray *arrResults;

@end

-(instancetype)initWithDatabaseFilename:(NSString *)dbFilename{
self = [super init];
if (self)
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    self.documentsDirectory = [paths objectAtIndex:0];
    self.databaseFilename = dbFilename;
    [self copyDatabaseIntoDocumentsDirectory];
}
return self;
}

对于解压缩文件，我写的就是，

#pragma mark - Private method implementation
-(void)copyDatabaseIntoDocumentsDirectory
{
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString *zipFilePath = [documentsDirectory stringByAppendingPathComponent:@"sampledb.zip"];

NSString *output = [documentsDirectory stringByAppendingPathComponent:self.documentsDirectory];

ZipArchive* za = [[ZipArchive alloc] init];

if( [za UnzipOpenFile:zipFilePath] )
{
    if( [za UnzipFileTo:output overWrite:YES] != NO )
    {
        NSLog(@"Archive unzip success");
    }

    [za UnzipCloseFile];
}
NSString *destinationPath = [self.documentsDirectory stringByAppendingPathComponent:self.databaseFilename];
if (![[NSFileManager defaultManager] fileExistsAtPath:destinationPath])
{
    NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:self.databaseFilename];
    NSError *error;
    [[NSFileManager defaultManager] copyItemAtPath:sourcePath toPath:destinationPath error:&error];
    if (error != nil) {
        NSLog(@"%@", [error localizedDescription]);
    }
}
}

在我的ViewController类ViewDidLoad中，我为复制数据库编写代码，如

- (void)viewDidLoad
{
[super viewDidLoad];
self.dbManager = [[DBManager alloc] initWithDatabaseFilename:@"sampledb.sql"];
}

但是我的数据库没有从zip文件复制请给我解决方案。这里sampledb.zip是我的zip文件，sampledb.sql是我的zip文件中的数据库文件。我使用github中的ZipArchive来解压缩文件。

Answer 1

至少

NSString *output = [documentsDirectory stringByAppendingPathComponent:self.documentsDirectory];

应该是

NSString *output = [documentsDirectory stringByAppendingPathComponent:@"sampledb.sql"];

如果sql zip文件的来源是捆绑包，则不需要压缩数据库文件，因为Xcode会在将其添加到捆绑包时将其压缩。

如何在iOS中解压缩文件并从中复制数据库？

1 个答案: