我无法找到将 NSDictionary 对象数组写入文件的问题。
NSDictionary 对象中的每个键都是 NSString ,值也是如此。因此,该数组应该可写入 plist,因为文档状态是必要的。无论如何,这是我的代码:
BOOL success = [representations writeToFile:[self filePathForCacheWithCacheID:cacheID] atomically:YES];
//success is NO
filePath 方法如下所示:
+ (NSString *)filePathForCacheWithCacheIDNSString *)cacheID
{
NSURL *cachesDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask] lastObject];
return [[cachesDirectory URLByAppendingPathComponent:cacheID] absoluteString];
}
cacheID 是字符串“objects”。在运行时,filePathForCacheWithCacheID: 方法返回如下字符串:
file:///Users/MyName/Library/Application%20Support/iPhone%20Simulator/7.0/Applications/3A57A7B3-A522-4DCC-819B-DC8DEEDCD041/Library/Caches/objects
这里可能出了什么问题?
Best Answer-推荐答案 strong>
代码正在尝试将文件写入表示文件 URL 而不是文件系统路径的字符串。如果您希望在需要路径字符串的地方使用该方法的返回值,则应将 absoluteString 调用替换为 path :
+ (NSString *)filePathForCacheWithCacheIDNSString *)cacheID
{
NSURL *cachesDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask] lastObject];
return [[cachesDirectory URLByAppendingPathComponent:cacheID] path];
}
或者,让 filePathForCacheWithCacheID: 方法返回一个 NSURL ,然后使用 writeToURL:atomically: 方法。
+ (NSURL *)fileURLForCacheWithCacheIDNSString *)cacheID
{
NSURL *cachesDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask] lastObject];
return [cachesDirectory URLByAppendingPathComponent:cacheID];
}
...
BOOL success = [representations writeToURL:[self fileURLForCacheWithCacheID:cacheID] atomically:YES];
关于ios - NSArray writeFileToPath 失败,我们在Stack Overflow上找到一个类似的问题:
https://stackoverflow.com/questions/18295305/
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