沙盒机制和文件(三)
最后更新于：2022-04-01 22:58:35
**0、判断一个文件是否存在***,***传入全路径(fileExistsAtPath)**
~~~
// 创建文件管理器
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSString * filePath = [documents stringByAppendingPathComponent:@"test"];
// 判断一个文件是否存在,传入全路径
if ([fileManager fileExistsAtPath:filePath]) {
NSLog(@"it is exit");
}
~~~
**1、在Documents里创建目录**
~~~
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"documentsDirectory%@",documentsDirectory);
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];
// 创建目录
[fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];
~~~
2、在目录下创建文件
~~~
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test00.txt"];
NSString *testPath2 = [testDirectory stringByAppendingPathComponent:@"test22.txt"];
NSString *testPath3 = [testDirectory stringByAppendingPathComponent:@"test33.txt"];
NSString *string = @"写入内容，write String";
[fileManager createFileAtPath:testPath contents:[string dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
[fileManager createFileAtPath:testPath2 contents:[string dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
[fileManager createFileAtPath:testPath3 contents:[string dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
~~~
**3、获取目录列里所有文件名**
两种方法获取：subpathsOfDirectoryAtPath 和subpathsAtPath
~~~
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"documentsDirectory%@",documentsDirectory);
NSFileManager *fileManage = [NSFileManager defaultManager];
NSString *myDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];
NSArray *file = [fileManage subpathsOfDirectoryAtPath: myDirectory error:nil];
NSLog(@"%@",file);
NSArray *files = [fileManage subpathsAtPath: myDirectory ];
NSLog(@"%@",files);
~~~
**4、fileManager使用操作当前目录**
~~~
//创建文件管理器
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//更改到待操作的目录下
[fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]];
//创建文件fileName文件名称，contents文件的内容，如果开始没有内容可以设置为nil，attributes文件的属性，初始为nil
NSString * fileName = @"testFileNSFileManager.txt";
NSArray *array = [[NSArray alloc] initWithObjects:@"hello world",@"hello world1", @"hello world2",nil];
[fileManager createFileAtPath:fileName contents:array attributes:nil];
~~~
**5、删除文件**
~~~
[fileManager removeItemAtPath:fileName error:nil];
~~~
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