iOS 常用操作之文件操作

在项目开发中，不可避免的会遇到将一些东西存到本地，或者在本地创建新的文件或文件夹，特地在此总结了一下。

文件操作

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];
}

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];
}

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;
	}
}

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;  
}

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;  
}

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;  
}

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);
}