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Converting NSString to NSDate (and back again)
...at to match our input string
// if the format doesn't match you'll get nil from your string, so be careful
dateFormatter.dateFormat = "dd-MM-yyyy"
//`date(from:)` returns an optional so make sure you unwrap when using.
var dateFromString: Date? = dateFormatter.date(from: dateString)
Date to Stri...
Does git return specific return error codes?
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From a comment in the source code of builtin/merge.c: "The backend exits with 1 when conflicts are left to be resolved, with 2 when it does not handle the given merge at all."
– Mike
Fe...
ViewPager and fragments — what's the right way to store fragment's state?
...r.instantiateItem(View, int) and save a reference to the fragment returned from the super call before returning it (it has the logic to find the fragment, if already present).
For a fuller picture, have a look at some of the source of FragmentPagerAdapter (short) and ViewPager (long).
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How do I create a constant in Python?
...alent to Java's final. However, it does not actually prevent reassignment:
from typing import Final
a: Final = 1
# Executes fine, but mypy will report an error if you run mypy on this:
a = 2
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How to send email attachments?
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Here's another:
import smtplib
from os.path import basename
from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate
def send_mai...
Swift Programming: getter/setter in stored property
..."var" keyword fool you! It does mean that there are two entries accessible from the private namespace, but that has no bearing on protected/public and keeps the value of foo valid at all times. This is essentially the "view" pattern. The problem you get with rewriting via didSet, in addition to it h...
Simulate airplane mode in iPhone Simulator
...like an iPhone. So you need a way, at the system layer, to restrict an app from talking to the network. Unix doesn't provide that; it would almost certainly need kernel support to get it. You could do it more easily for NSURLConnection and its kin, but it could be more confusing if some calls work a...
Vagrant ssh authentication failure
...0.1'
If still does not work try this:
Remove insecure_private_key file from c:\Users\USERNAME\.vagrant.d\insecure_private_key
Run vagrant up (vagrant will be generate a new insecure_private_key file)
In other cases, it is helpful to just set forward_agent in Vagrantfile:
Vagrant::Config.run d...
What is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?
...lbar. It is similarly incorrect to use this attribute to hide content just from one presentation — if something is marked hidden, it is hidden from all presentations, including, for instance, screen readers.
http://dev.w3.org/html5/spec/Overview.html#the-hidden-attribute
Since CSS can target di...
Hibernate: Automatically creating/updating the db tables based on entity classes
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You might try changing this line in your persistence.xml from
<property name="hbm2ddl.auto" value="create"/>
to:
<property name="hibernate.hbm2ddl.auto" value="update"/>
This is supposed to maintain the schema to follow any changes you make to the Model each time ...