Question

我花了几个小时试图解决这个问题，但我的想法已经用尽了。

我要做的就是归档一个对象，但方法archiveRootObject一直在返回NO

这是我的代码：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cacheDirectory = [paths objectAtIndex:0];
cacheDirectory = [cacheDirectory stringByAppendingPathComponent:@"MyAppCache"];
NSString *fullPath = [cacheDirectory stringByAppendingPathComponent:@"archive.data"];

if(![[NSFileManager defaultManager] fileExistsAtPath:fullPath]){
    [[NSFileManager defaultManager] createDirectoryAtPath:fullPath withIntermediateDirectories:YES attributes:nil error:nil];
}

NSArray *array = [NSArray arrayWithObjects:@"hello", @"world", nil];
NSLog(@"Full Path: %@", fullPath);
BOOL res = [NSKeyedArchiver archiveRootObject:array toFile:fullPath];

if(res){
    NSLog(@"YES");
}else{
    NSLog(@"NO");
}

每次运行时，都会打印NO。

任何帮助将不胜感激！

Answer 1

使用路径fullPath创建目录，然后尝试在同一路径中写入文件。用这样的文件覆盖目录是不可能的。使用cacheDirectory字符串创建目录。

Answer 2

NSString * cacheDirectory不是可变字符串，在您初始化之后，您尝试修改它，以便您写入顶级目录。

要快速解决问题，请尝试：

NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,   NSUserDomainMask, YES);
NSString *documentPath = ([documentPaths count] > 0) ? [documentPaths objectAtIndex:0] : nil;
NSString *documentsResourcesPath = [documentPath  stringByAppendingPathComponent:@"MyAppCache"];

NSString *fullPath = [documentsResourcesPath stringByAppendingPathComponent:@"archive.data"];

NSKeyedArchiver archiveRootObject保持返回NO

2 个答案: