获取应用沙盒根路径

NSString *dirHome = NSHomeDirectory(); 

获取 Documents 目录文件

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths lastObject]; 

获取 Library 目录路径

NSArray *paths2 = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryDirectofry = [paths2 lastObject]; 

获取 Tmp 目录路径

NSString *tmpDirectory = NSTemporaryDirectory(); 

创建文件夹

NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testDirectory = [documentsDirectory stringByAppendingString:@"test"];
BOOL res = [fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];   
if (res) {

    NSLog(@"创建文件夹成功");
} else {

    NSLog(@"创建文件夹失败");
}

创建文件

NSData *data = [NSData dataWithContentsOfFile:@"/Users/zxq/Desktop/userInfor"];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
BOOL res2 = [fileManager createFileAtPath:testPath contents:data attributes:nil]; 
if (res2) {

    NSLog(@"创建文件成功");
} else {

    NSLog(@"创建文件失败");
}

测试写入内容

NSString *content = @"测试写入内容";
BOOL res3 = [content writeToFile:testPath atomically:YES encoding:NSUTF8StringEncoding error:nil]; 
if (res3) {

    NSLog(@"文件写入成功");
} else {

    NSLog(@"文件写入失败");
}

读取文件内容

NSString *content2 = [NSString stringWithContentsOfFile:testPath encoding:NSUTF8StringEncoding error:nil]; 

获取文件属性

NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:testPath error:nil]; 
for (int i = 0; i < [[fileAttributes allKeys] count]; i ++) {

    NSLog(@"key: %@, value:%@", [[fileAttributes allKeys] objectAtIndex:i], [fileAttributes objectForKey:[[fileAttributes allKeys] objectAtIndex:i]]);
}

删除文件

BOOL res4 = [fileManager removeItemAtPath:testPath error:nil]; 
if (res4) {

    NSLog(@"删除成功");
} else {

    NSLog(@"删除失败");
}