ios NSFileManager创建目录、文件

NSFileManager *fileManager = [NSFileManager defaultManager];        
NSString *str1 = NSHomeDirectory();
_filePath = [[NSString stringWithFormat:@"%@/Documents/imageViews/test.plist",str1]retain];
        
 NSLog(@"%@",_filePath);
  if(![fileManager fileExistsAtPath:_filePath]){//如果不存在,则说明是第一次运行这个程序,那么建立这个文件夹
    NSLog(@"first run");
      NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
      NSString *directryPath = [path stringByAppendingPathComponent:@"imageViews"];
       [fileManager createDirectoryAtPath:directryPath withIntermediateDirectories:YES attributes:nil error:nil];
       NSString *filePath = [directryPath stringByAppendingPathComponent:@"test.plist"];
      NSLog(@"%@",filePath);
      [fileManager createFileAtPath:filePath contents:nil attributes:nil];
.........
 }

此段代码创建的filePath为

/Users/yuqiu/Library/Application Support/iPhone Simulator/6.1/Applications/2A8EFE9E-4CCA-41D1-8A5F-1FF00A115FA3/Documents/imageViews/test.plist
 

一、创建~/Documents/imageViews/test.plist的详细步骤

     1、找到Documetnts目录所在的位置  

NSString *str1 = NSHomeDirectory();

str1为/Users/yuqiu/Library/Application Support/iPhone Simulator/6.1/Applications/2A8EFE9E-4CCA-41D1-8A5F-1FF00A115FA3

    2、加上Documetnts这层目录

 NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

path为/Users/yuqiu/Library/Application Support/iPhone Simulator/6.1/Applications/2A8EFE9E-4CCA-41D1-8A5F-1FF00A115FA3/Documents
注意:使用的是stringByAppendingPathComponent:方法,不需要加“/";  如果用的是别的方法加的话,需要写成@"/Documents".

ps:这里1、2两步可以简化为

NSArray *paths = NSSearchPathForDerictoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *path = [paths lastObject];

    3、在Documetnts目录中创建名为imageViews的目录

NSFileManager *fileManager = [NSFileManager defaultManager];      
NSString *directryPath = [path stringByAppendingPathComponent:@"imageViews"];
[fileManager createDirectoryAtPath:directryPath withIntermediateDirectories:YES attributes:nil error:nil];

创建NSFileManager的实例fileManager.NSFileManager这个类是专门进行文件管理的,可以创建文件,目录,删除,遍历目录等。我们调用了 createDirectoryAtPath:方法创建了一个新目录。

    4、在imageViews目录里,创建文件test.plist.

NSString *filePath = [directryPath stringByAppendingPathComponent:@"test.plist"];
[fileManager createFileAtPath:filePath contents:nil attributes:nil];

   调用createFileAtPath:创建文件
   最后得到的整个文件路径为:

二、NSFileManager常用的文件管理操作

     1、创建目录  createDirectoryAtPath:

     2、创建文件  createFileAtPath:

     3、删除某个文件  removeItemAtPath:

     4、检查某个文件是否存在  fileExistsAtPath: 

     5、检查文件是否可读 isReadableFileAtPath:

          是否可写:isWritableFileAtPath:

      6、取得文件属性  fileAttributesAtPath:

          改变文件属性changeAttributesAtPath:

      7、从path代表的文件中读取数据:contentsAtPath

      8、移动文件movePath:toPath:handler:

      9、复制文件copyPath:toPath:handler:

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转载自www.cnblogs.com/edensyd/p/9177724.html