Question

如何将NSTimeInterval转换为整数值？

我的TimeInterval保存值83.01837。我需要将其转换为83。我用谷歌搜索但找不到任何帮助。

Answer 1

直接分配：

NSTimeInterval interval = 1002343.5432542;
NSInteger time = interval;
//time is now equal to 1002343

NSTimeInterval是一个double，所以如果你直接将它分配给一个NSInteger（或int，如果你愿意的话）它就可以了。这将把时间缩短到最接近的秒数。

如果您希望舍入到最接近的秒（而不是将其切断），您可以在作出任务前使用回合：

NSTimeInterval interval = 1002343.5432542;
NSInteger time = round(interval);
//time is now equal to 1002344

Answer 2

根据the documentation，NSTimeInterval只是double：

typedef double NSTimeInterval;

您可以将其转换为int：

seconds = (int) myTimeInterval;

注意溢出！

Answer 3

在Swift 3.0中

public class main extends ListActivity implements android.widget.CompoundButton.OnCheckedChangeListener {

    SQLiteDatabase dBase;
    private CheckBox checkBox1
    ListView lv;
     ArrayList<Student>studentList;
    StudentAdapter slAdapter;
    private  Context context; 
     String returnString;

    private String URL_ITEMS;

    private String section;

    ProgressDialog progressdialog;


    private static final String TAG_FIXTURE = "fixture";
        private static final String TAG_ID = "id";
        private static final String TAG_NAME = "name";

        JSONArray matchFixture = null;// to store the result of MySQL query after decoding JSON
        ArrayList<HashMap<String, String>> matchFixtureList = new ArrayList<HashMap<String, String>>();

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);




        // GET THE DATA FROM OLD INTENT
        Intent previous = getIntent();
        section = previous.getStringExtra("section");
        Log.i("Section: ", " " + section);

        // Now generate the URL
        URL_ITEMS = "http://10.0.2.2/attend/getFixture.php?section=" + section;

        new GetFixture().execute();
}



    // declare parameters that are passed to PHP script i.e. the name "section" and its value submitted by user   
    ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
    private class GetFixture extends AsyncTask<Void, Void, Void> {
        @Override
            protected void onPreExecute() {
            super.onPreExecute();
            progressdialog = new ProgressDialog(main.this);
            progressdialog.setTitle("Please Wait");
            progressdialog.setMessage("Getting Information from Server");
            progressdialog.setCancelable(false);
            progressdialog.show();


        }
        @Override
            protected Void doInBackground(Void... arg) {
            ServiceHandler serviceClient = new ServiceHandler();
            Log.d("url: ", "> " + URL_ITEMS);
            String json = serviceClient.makeServiceCall(URL_ITEMS,ServiceHandler.GET);
            // print the json response in the log
            Log.d("main.class", " Get match fixture response: > " + json);
            if (json != null) {
                try {
                    Log.d("try", "in the try");
                    JSONObject jsonObj = new JSONObject(json);
                    Log.d("jsonObject", "new json Object");
                    // Getting JSON Array node
                    matchFixture = jsonObj.getJSONArray(TAG_FIXTURE);
                    Log.d("json aray", "user point array");
                    int len = matchFixture.length();
                    Log.d("len", "get array length");


                    if(matchFixture.length() == 0) {
                        runOnUiThread(new Runnable() {
                            public void run() {
                                Toast.makeText(main.this, "No Data Available for Section " + section, Toast.LENGTH_SHORT).show();

                            }
                        });
                    }



                    for (int i = 0; i < matchFixture.length(); i++) {
                        JSONObject c = matchFixture.getJSONObject(i);
                        String id = c.getString(TAG_ID);
                        Log.d("id", id);

                        String name = c.getString(TAG_NAME);
                        Log.d("name", name);

                        //  hashmap for single match
                        HashMap<String, String> matchFixture = new HashMap<String, String>();
                        // adding each child node to HashMap key => value
                        matchFixture.put(TAG_ID, id);
                        matchFixture.put(TAG_NAME, name);
                        matchFixtureList.add(matchFixture);
                    }
                }

                catch (JSONException e) {
                    Log.d("catch", "in the catch");
                    e.printStackTrace();
                }
            }


            else {
                 Log.e("JSON Data", "Didn't receive any data from server!");
                Toast.makeText(main.this, "Check Internet Connection", Toast.LENGTH_SHORT).show();
    }


    return null;
}
@Override
    protected void onPostExecute(Void result) {
    super.onPostExecute(result);
    ListAdapter adapter = new SimpleAdapter(
                    main.this, matchFixtureList,
                    R.layout.list1_item, new String[] {
        TAG_ID, TAG_NAME          }
    , new int[] {
        R.id.id,R.id.name

    }
    );
    setListAdapter(adapter);

  //  lv.setAdapter(adapter);

//lv.setAdapter(slAdapter);
    if(progressdialog.isShowing()) {
        progressdialog.dismiss();
    }
}
    }
    @Override
 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        Toast.makeText(main.this, "into the on checked change listener..", Toast.LENGTH_SHORT).show();



        int pos = lv.getPositionForView(buttonView);
        if(pos !=ListView.INVALID_POSITION){

                for (int i = 0; i < matchFixture.length(); i++) {


                     JSONObject c = null;
                    try {
                        c = matchFixture.getJSONObject(i);

                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                     String id = null;
                    try {
                        id = c.getString(TAG_ID);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                     String name = null;
                    try {
                        name = c.getString(TAG_NAME);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
        SQLiteDatabase database = openOrCreateDatabase("ORCL", MODE_PRIVATE, null);
                                database.execSQL("CREATE TABLE IF NOT EXISTS attendance(id integer primary key autoincrement,name VARCHAR(150),id INT(10)");
                                database.execSQL("INSERT INTO attendance(name,id) VALUES('" + name + "'," + id+");");
                                Toast.makeText(main.this, "record inserted..", Toast.LENGTH_SHORT).show();
                                database.close();
                }


                                                       }
    }



        /** You can not insert empty values and you should create Database and tables first **/


    //ContentValues values= new ContentValues();
//  dBase.insert("attendance", null, values);
//  Toast.makeText(getApplicationContext(), "Record Inserted..", 2000).show();

Answer 4

我怀疑来自NSDate的NSTimeInterval值会溢出NSInteger。你可能想要很长时间。（64位整数。）那些可以存储鸣喇叭大整数值（-2 ^ 63到2 ^ 63 -1）

long long integerSeconds = round([NSDate timeIntervalSinceReferenceDate]);

编辑：

看起来像NSInteger CAN 存储NSTimeInterval，至少在接下来的几十年里。当前日期的timeIntervalSinceReferenceDate大约是519,600,000，或大约2 ^ 28。在32位设备上，NSInteger可以保存从-2 ^ 31到2 ^ 31-1的值。（2 ^ 31是2,147,483,648

Answer 5

Swift 4，Swift 5

我只是强制转换为Int64：

Int64(Date().timeIntervalSince1970)

Answer 6

我需要在Swift Number中存储NSDate。我使用了以下演员表，它很棒。

Double(startDateTime.timeIntervalSince1970)

如何将NSTimeInterval转换为int？

6 个答案:

编辑：