iOS NSFileManager 文件操作详解

FileManager.h文件：

#import <Foundation/Foundation.h>

@interface FileManager : NSObject

+(BOOL)fileExistsAtPath:(NSString *)path;

+(NSString *)getDocumentsPath;

+(BOOL)createDirectoryWithPath:(NSString *)path;

+(BOOL)removeFileAtPath:(NSString *)filePath;

+(BOOL)renameFileName:(NSString *)oldName toNewName:(NSString *)newName;

+(NSData *)readFileContent:(NSString *)filePath;

+(BOOL)saveToDirectory:(NSString *)path data:(NSData *)data name:(NSString *)newName;

+(float)getFileSize:(NSString *)filePath;

@end

FileManager.m文件：

#import "FileManager.h"

@class NSFileManager;

#define DocumentsPath [self getDocumentsPath]

@implementation FileManager

//判断目录是否存在

+(BOOL)fileExistsAtPath:(NSString *)path

{

return [[NSFileManager defaultManager] fileExistsAtPath:path];

}

//获取Documents路径

+(NSString *)getDocumentsPath

{

NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString * documentsDirectory = [paths objectAtIndex:0];

return documentsDirectory;

}

//在Documents目录下创建新目录或文件

+(BOOL)createDirectoryWithPath:(NSString *)path

{

BOOL result = NO;

NSFileManager * fileManager = [NSFileManager defaultManager];

NSString * myDirectory = [DocumentsPath stringByAppendingPathComponent:path];

if ([fileManager fileExistsAtPath:myDirectory] == NO) {

NSError * error = nil;

result=[fileManager createDirectoryAtPath:myDirectory withIntermediateDirectories:NO attributes:nil error:&error];

if (error) {

NSLog(@"创建目录失败：%@",[error localizedDescription]);

}

}

return result;

}

//删除目录或文件

+(BOOL)removeFileAtPath:(NSString *)filePath

{

BOOL result = NO;

NSError * error = nil;

NSString * fullPath = [DocumentsPath stringByAppendingPathComponent:filePath];

result = [[NSFileManager defaultManager] removeItemAtPath:fullPath error:&error];

if (error)

{

NSLog(@"删除失败：%@",[error localizedDescription]);

}

return result;

}

//重命名目录或文件

+(BOOL)renameFileName:(NSString *)oldName toNewName:(NSString *)newName

{

BOOL result = NO;

NSError * error = nil;

result = [[NSFileManager defaultManager] moveItemAtPath:[DocumentsPath stringByAppendingPathComponent:oldName] toPath:[DocumentsPath stringByAppendingPathComponent:newName] error:&error];

if (error) {

NSLog(@"重命名失败：%@",[error localizedDescription]);

}

return result;

}

//读取某个文件

+(NSData *)readFileContent:(NSString *)filePath

{

return [[NSFileManager defaultManager] contentsAtPath:[DocumentsPath stringByAppendingPathComponent:filePath]];

}

//保存某个文件

+(BOOL)saveToDirectory:(NSString *)path data:(NSData *)data name:(NSString *)newName

{

return [[NSFileManager defaultManager] createFileAtPath:[DocumentsPath stringByAppendingPathComponent:[path stringByAppendingPathComponent:newName]] contents:data attributes:nil];

}

//计算文件大小

+(float)getFileSize:(NSString *)filePath

{

NSError * error = nil;

NSDictionary * attributes = [NSDictionary dictionaryWithDictionary:[[NSFileManager defaultManager] attributesOfItemAtPath:[DocumentsPath stringByAppendingPathComponent:filePath] error:&error]];

if (attributes != nil)

{

return [[attributes objectForKey:NSFileSize] floatValue];

}

if (error) {

NSLog(@"计算文件大小失败：%@",[error localizedDescription]);

}

return 0;

}

@end