为什么testfile文件会出现在/Users/sunwukong/Library/Developer/Xcode/DerivedData/File1-bwsulbyqquwovtafwjwmojatsxnk/Build/Products/Debug中呢？

NSString *fName=@"/Users/sunwukong/Library/testfile.pages";
NSFileManager *fm;
NSString *content=@"hey,girl";
fm=[NSFileManager defaultManager];
BOOL result=[fm createFileAtPath:fName contents:[content dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];