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How to calculate time in hours between two dates in iOS
...enDates = [date1 timeIntervalSinceDate:date2];
double secondsInAnHour = 3600;
NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;
See, the apple reference library http://developer.apple.com/library/mac/navigation/
or if you are using Xcode just select help/documentation from th...
How to strike through obliquely with css
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190
There is a hacky way to do this, using the :before pseudo element. You give the :before a border...
How to throw a C++ exception
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#include <stdexcept>
int compare( int a, int b ) {
if ( a < 0 || b < 0 ) {
throw std::invalid_argument( "received negative value" );
}
}
The Standard Library comes with a nice collection of built-in exception objects you can throw. Keep in mind that you should always...
Android and setting alpha for (image) view alpha
...etAlpha(float) whose XML counterpart is android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
<ImageView android:alpha="0.4">
However, the latter in available only since API level 11.
s...
How to install latest (untagged) state of a repo using bower?
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220
Specify a git commit SHA instead of a version:
bower install '<git-url>#<git-commit-sh...
What's the best way to add a drop shadow to my UIView
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280
Try this:
UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:view.bounds];
view.layer....
Send a file via HTTP POST with C#
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Using .NET 4.5 (or .NET 4.0 by adding the Microsoft.Net.Http package from NuGet) there is an easier way to simulate form requests. Here is an example:
private async Task<System.IO.Stream> Upload(string actionUrl, string paramString, Stream para...
Python Progress Bar
... something very simple would do:
import time
import sys
toolbar_width = 40
# setup toolbar
sys.stdout.write("[%s]" % (" " * toolbar_width))
sys.stdout.flush()
sys.stdout.write("\b" * (toolbar_width+1)) # return to start of line, after '['
for i in xrange(toolbar_width):
time.sleep(0.1) # do ...
An error occurred while installing pg (0.17.1), and Bundler cannot continue
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
16 Answers
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