iphone - 检查plist是否存在，如果不存在从这里加载

Question

我正在尝试检查我的文档文件夹中是否存在 plist:如果是，则加载它，如果不从资源文件夹加载。

 - (void)viewWillAppear:(BOOL)animated
 {
 //to load downloaded file
 NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
 NSString *documentsDirectory = [docpaths objectAtIndex:0]; 
 NSString *docpath = [documentsDirectory stringByAppendingPathComponent:@"downloadedfile.plist"];  

 //if document folder got file
  if(docpath != nil) 
   {
   NSDictionary *dict = [[NSDictionary alloc] 
     initWithContentsOfFile:docpath];
   self.allNames = dict;
   [dict release];
  }
  //on error it will try to read from disk 

  else {
  NSString *path = [[NSBundle mainBundle] pathForResource:@"resourcefile"
           ofType:@"plist"];
   NSDictionary *dict = [[NSDictionary alloc] 
     initWithContentsOfFile:path];
    self.allNames = dict;
   [dict release];

   } 
   [table reloadData];

我哪里出错了？ plist 未从资源文件夹加载。

Answer 1

我认为如果您创建 NSFileManager 的实例，则可以使用文件存在方法

BOOL exists;
NSFileManager *fileManager = [NSFileManager defaultManager];

exists = [fileManager fileExistsAtPath:docPath];

if(exists == NO)
{
// do your thing
}