简介
由于项目需要，整理了一份文件处理的方法。
下面是一些常用的方法：
获取Document路径
+ (NSString *)getDocumentPath
{
NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [filePaths objectAtIndex:0];
}
获取Library路径
+ (NSString *)getLibraryPath
{
NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
return [filePaths objectAtIndex:0];
}
获取应用程序路径
+ (NSString *)getApplicationPath
{
return NSHomeDirectory();
}
获取Cache路径
+ (NSString *)getCachePath
{
NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
return [filePaths objectAtIndex:0];
}
获取Temp路径
+ (NSString *)getTempPath
{
return NSTemporaryDirectory();
}
判断文件是否存在于某个路径中
+ (BOOL)fileIsExistOfPath:(NSString *)filePath
{
BOOL flag = NO;
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:filePath]) {
flag = YES;
} else {
flag = NO;
}
return flag;
}
从某个路径中移除文件
+ (BOOL)removeFileOfPath:(NSString *)filePath
{
BOOL flag = YES;
NSFileManager *fileManage = [NSFileManager defaultManager];
if ([fileManage fileExistsAtPath:filePath]) {
if (![fileManage removeItemAtPath:filePath error:nil]) {
flag = NO;
}
}
return flag;
}
从URL路径中移除文件
- (BOOL)removeFileOfURL:(NSURL *)fileURL
{
BOOL flag = YES;
NSFileManager *fileManage = [NSFileManager defaultManager];
if ([fileManage fileExistsAtPath:fileURL.path]) {
if (![fileManage removeItemAtURL:fileURL error:nil]) {
flag = NO;
}
}
return flag;
}
创建文件路径
+(BOOL)creatDirectoryWithPath:(NSString *)dirPath
{
BOOL ret = YES;
BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:dirPath];
if (!isExist) {
NSError *error;
BOOL isSuccess = [[NSFileManager defaultManager] createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
if (!isSuccess) {
ret = NO;
NSLog(@"creat Directory Failed. errorInfo:%@",error);
}
}
return ret;
}
创建文件
+ (BOOL)creatFileWithPath:(NSString *)filePath
{
BOOL isSuccess = YES;
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL temp = [fileManager fileExistsAtPath:filePath];
if (temp) {
return YES;
}
NSError *error;
//stringByDeletingLastPathComponent:删除最后一个路径节点
NSString *dirPath = [filePath stringByDeletingLastPathComponent];
isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
if (error) {
NSLog(@"creat File Failed. errorInfo:%@",error);
}
if (!isSuccess) {
return isSuccess;
}
isSuccess = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
return isSuccess;
}
保存文件
+ (BOOL)saveFile:(NSString *)filePath withData:(NSData *)data
{
BOOL ret = YES;
ret = [self creatFileWithPath:filePath];
if (ret) {
ret = [data writeToFile:filePath atomically:YES];
if (!ret) {
NSLog(@"%s Failed",__FUNCTION__);
}
} else {
NSLog(@"%s Failed",__FUNCTION__);
}
return ret;
}
追加写文件
+ (BOOL)appendData:(NSData *)data withPath:(NSString *)path
{
BOOL result = [self creatFileWithPath:path];
if (result) {
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:path];
[handle seekToEndOfFile];
[handle writeData:data];
[handle synchronizeFile];
[handle closeFile];
return YES;
} else {
NSLog(@"%s Failed",__FUNCTION__);
return NO;
}
}
获取文件
+ (NSData *)getFileData:(NSString *)filePath
{
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:filePath];
NSData *fileData = [handle readDataToEndOfFile];
[handle closeFile];
return fileData;
}
读取文件
+ (NSData *)getFileData:(NSString *)filePath startIndex:(long long)startIndex length:(NSInteger)length
{
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:filePath];
[handle seekToFileOffset:startIndex];
NSData *data = [handle readDataOfLength:length];
[handle closeFile];
return data;
}
移动文件
+ (BOOL)moveFileFromPath:(NSString *)fromPath toPath:(NSString *)toPath
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:fromPath]) {
NSLog(@"Error: fromPath Not Exist");
return NO;
}
if (![fileManager fileExistsAtPath:toPath]) {
NSLog(@"Error: toPath Not Exist");
return NO;
}
NSString *headerComponent = [toPath stringByDeletingLastPathComponent];
if ([self creatFileWithPath:headerComponent]) {
return [fileManager moveItemAtPath:fromPath toPath:toPath error:nil];
} else {
return NO;
}
}
拷贝文件
+(BOOL)copyFileFromPath:(NSString *)fromPath toPath:(NSString *)toPath
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:fromPath]) {
NSLog(@"Error: fromPath Not Exist");
return NO;
}
if (![fileManager fileExistsAtPath:toPath]) {
NSLog(@"Error: toPath Not Exist");
return NO;
}
NSString *headerComponent = [toPath stringByDeletingLastPathComponent];
if ([self creatFileWithPath:headerComponent]) {
return [fileManager copyItemAtPath:fromPath toPath:toPath error:nil];
} else {
return NO;
}
}
获取文件夹下文件列表
+ (NSArray *)getFileListInFolderWithPath:(NSString *)path
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *fileList = [fileManager contentsOfDirectoryAtPath:path error:&error];
if (error) {
NSLog(@"getFileListInFolderWithPathFailed, errorInfo:%@",error);
}
return fileList;
}
获取文件大小
+ (long long)getFileSizeWithPath:(NSString *)path
{
unsigned long long fileLength = 0;
NSNumber *fileSize;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
if ((fileSize = [fileAttributes objectForKey:NSFileSize])) {
fileLength = [fileSize unsignedLongLongValue]; //单位是 B
}
return fileLength / 1000; 换算为K
}
获取文件创建时间
+ (NSString *)getFileCreatDateWithPath:(NSString *)path
{
NSString *date = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
date = [fileAttributes objectForKey:NSFileCreationDate];
return date;
}
获取文件所有者
+ (NSString *)getFileOwnerWithPath:(NSString *)path
{
NSString *fileOwner = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
fileOwner = [fileAttributes objectForKey:NSFileOwnerAccountName];
return fileOwner;
}
获取文件更改日期
+ (NSString *)getFileChangeDateWithPath:(NSString *)path
{
NSString *date = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
date = [fileAttributes objectForKey:NSFileModificationDate];
return date;
}
获取文件的信息(包含了上面文件大小)
+(NSDictionary*)getFileInfo:(NSString*)path{
NSError *error;
NSDictionary *reslut = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:&error];
if (error) {
NSLog(@"getFileInfo Failed:%@",[error localizedDescription]);
}
return reslut;
}
创建文件目录
- (void)createDir {
NSString * docsdir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *dataFilePath = [docsdir stringByAppendingPathComponent:@"archiver"]; // 在Document目录下创建 "archiver" 文件夹
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isDir = NO;
// fileExistsAtPath 判断一个文件或目录是否有效，isDirectory判断是否一个目录
BOOL existed = [fileManager fileExistsAtPath:dataFilePath isDirectory:&isDir];
if (!(isDir && existed)) {
// 在Document目录下创建一个archiver目录
[fileManager createDirectoryAtPath:dataFilePath withIntermediateDirectories:YES attributes:nil error:nil];
}
// 在archiver下写入文件
NSString *path = [dataFilePath stringByAppendingPathComponent:@"my.txt"];
NSString *text = @"It's a beautiful day.";
BOOL writeSuccess = [text writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (writeSuccess) {
NSLog(@"写入成功");
}
}