iOS 常用操作之文件操作

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文件操作

1. 获取Documents文件夹路径

/** *  获取Documents文件夹路径 * *  @return 文件夹路径 */+ (NSString *)getDocumentsFolderPath{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    return [paths objectAtIndex:0];}

2. 获取Documents文件路径

/** *  获取Documents文件路径 * *  @param fileName 文件名称 * *  @return 文件路径 */+ (NSString *)getDocumentsFilePath:(NSString *)fileName{    return [[self getDocumentsFolderPath] stringByAppendingPathComponent:fileName];}

3. 获取一个目录所占的空间大小

/** *  获取一个目录所占的空间大小 * *  @param filePath 文件目录路径 * *  @return 目录空间大小 */+ (long long)fileSizeAtPath:(NSString*) filePath{    NSFileManager* manager = [NSFileManager defaultManager];    if ([manager fileExistsAtPath:filePath]){        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];    }    else{        return 0;    }}

4.文件是否存在

/*文件是否存在*/  + (BOOL)isFileExisted:(NSString *)fileName{      NSFileManager *fileManager = [NSFileManager defaultManager];      if(![fileManager fileExistsAtPath:[self getFilePath:fileName]]){          return NO;      }      return YES;  }

5.创建指定名字的文件

/*创建指定名字的文件*/  + (BOOL)createFileAtPath:(NSString *)fileName{      NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);      NSString *path = [[array objectAtIndex:0] stringByAppendingPathComponent:fileName];      NSLog(@"-----%@:", path);      NSFileManager *fileManager = [NSFileManager defaultManager];      if(![fileManager fileExistsAtPath:path]){          [fileManager createFileAtPath:path contents:nil attributes:nil];          return YES;      }      return NO;  }

6.创建指定名字的文件夹

/*创建指定名字的文件夹*/  + (BOOL)createDirectoryAtPath:(NSString *)fileName{      NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);      NSString *path = [[array objectAtIndex:0] stringByAppendingPathComponent:fileName];      NSLog(@"-----%@:", path);      NSFileManager *fileManager = [NSFileManager defaultManager];      if(![fileManager fileExistsAtPath:path]){          NSError *error = nil;          [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error];          return YES;      }      return NO;  }

7.删除文件

+ (BOOL)deleteFileAtPath:(NSString *)fileName{      NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);      NSString *path = [[array objectAtIndex:0] stringByAppendingPathComponent:fileName];      NSFileManager *fileManager = [NSFileManager defaultManager];      if(![fileManager fileExistsAtPath:path]){          return NO;      }      [fileManager removeItemAtPath:path error:nil];      return YES;  }

NSUserDefaults

保存和取出

/** 保存 @param value <#value description#> @param key <#key description#> */+(void)saveValue:(id) value forKey:(NSString *)key{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    [userDefaults setObject:value forKey:key];    [userDefaults synchronize];}/** 取出 @param key <#key description#> @return <#return value description#> */+(id)valueForKey:(NSString *)key{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    return [userDefaults objectForKey:key];}/** 根据key取出NSString的value @param key <#key description#> @return <#return value description#> */+(id)StringForKey:(NSString *)key{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    return [userDefaults stringForKey:key];}/** 根据key取出Bool型的值 @param key <#key description#> @return <#return value description#> */+(BOOL)boolValueForKey:(NSString *)key{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    return [userDefaults boolForKey:key];}/** 保存Bool型的值 @param value value @param key key */+(void)saveBoolValue:(BOOL)value forKey:(NSString *)key{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    [userDefaults setBool:value forKey:key];    [userDefaults synchronize];}/** 获取userDefaults存储的所有信息 */+(void)printAllUserDefault{    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    NSDictionary *dic = [userDefaults dictionaryRepresentation];    NSLog(@"%@",dic);}

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