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Positioning MKMapView to show multiple annotations at once
... region.center.latitude = (southWest.latitude + northEast.latitude) / 2.0;
region.center.longitude = (southWest.longitude + northEast.longitude) / 2.0;
region.span.latitudeDelta = meters / 111319.5;
region.span.longitudeDelta = 0.0;
_savedRegion = [_mapView regi...
How to migrate/convert from SVN to Mercurial (hg) on windows
...any thanks to bgever for pointing out in the comments that with TortoiseHg 2.0, enabling the convert extension is easier than ever. As he says
With TortoiseHG 2.0 this has been made
much simpler: Start the TortoiseHG
Workbench from the Start menu. Select
File --> Settings. Select Exten...
Create array of symbols
...original answer was written back in September '11, but, starting from Ruby 2.0, there is a shorter way to create an array of symbols! This literal:
%i[address city state postal country]
will do exactly what you want.
shar...
Django, creating a custom 500/404 error page
...ews.handler404'
handler500 = 'my_app.views.handler500'
Update for Django 2.0
Signatures for handler views were changed in Django 2.0:
https://docs.djangoproject.com/en/2.0/ref/views/#error-views
If you use views as above, handler404 will fail with message:
"handler404() got an unexpected ke...
C# Lambda expressions: Why should I use them?
...
Lambda's cleaned up C# 2.0's anonymous delegate syntax...for example
Strings.Find(s => s == "hello");
Was done in C# 2.0 like this:
Strings.Find(delegate(String s) { return s == "hello"; });
Functionally, they do the exact same thing, its ...
Default behavior of “git push” without a branch specified
...considered to be matching.
This used to be the default, but not since Git 2.0 (simple is the new default).
upstream: push the current branch to its upstream branch (tracking is a deprecated synonym for upstream)
current: push the current branch to a branch of the same name
simple: (new in Git 1.7.1...
In which order should floats be added to get the most precise result?
...0000;
double big = 1.0;
double small = 1e-9;
double expected = 2.0;
double sum = big;
for (long i = 0; i < billion; ++i)
sum += small;
std::cout << std::scientific << std::setprecision(1) << big << " + " << billion << " * " <...
Should I compile release builds with debug info as “full” or “pdb-only”?
...real reason: history. Back in .NET 1.0 there were differences, but in .NET 2.0 there isn't. It looks like .NET 4.0 will follow the same pattern. After double-checking with the CLR Debugging Team, there is no difference at all.
– bentayloruk
May 10 '13 at 8:34
...
How do I concatenate or merge arrays in Swift?
... the arrays with +, building a new array
let c = a + b
print(c) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
or append one array to the other with += (or append):
a += b
// Or:
a.append(contentsOf: b) // Swift 3
a.appendContentsOf(b) // Swift 2
a.extend(b) // Swift 1.2
print(a) // [1.0,...
How to lazy load images in ListView in Android
...ship. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in wri...