判断某个路径是否存在

 NSFileManager *fm=[NSFileManager defaultManager];

    NSString *str=@"/private/var/mobile/Media/DCIM/100APPLE";

    BOOL retExist=FALSE;

    retExist=[fm fileExistsAtPath:str];

    if (retExist) {

        NSLog(@"路径存在");

        NSArray *arr=[fm contentsOfDirectoryAtPath:str error:nil];

        NSLog(@"arr:%@",arr);

    }else{

    

        NSLog(@"路径不存在");

    }