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NSNotificationCenter addObserver in Swift
...erit from an Objective-C object, you must prefix your method with @objc in order to use it as a selector.
@objc private func batteryLevelChanged(notification: NSNotification){
//do stuff using the userInfo property of the notification object
}
See NSNotificationCenter Class Reference, In...
Disable output buffering
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A straight-forward way of using the flush keyword argument of Python 3 in order to always have unbuffered output is:
import functools
print = functools.partial(print, flush=True)
afterwards, print will always flush the output directly (except flush=False is given).
Note, (a) that this answers t...
How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
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PerformSelector:WithObject always takes an object, so in order to pass arguments like int/double/float etc..... You can use something like this.
//NSNumber is an object..
[self performSelector:@selector(setUserAlphaNumber:) withObject: [NSNumber numberWithFloat: 1.0f]
aft...
How do I execute a string containing Python code in Python?
...ntered code. You should always look at alternatives first, such as higher order functions, to see if these can better meet your needs.
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Standard Android Button with a different color
I'd like to change the color of a standard Android button slightly in order to better match a client's branding.
20 Answers...
Polymorphism in C++
...conversion sequence is a sequence of standard conversions in the following order:
Zero or one conversion from the following set: lvalue-to-rvalue conversion, array-to-pointer conversion, and function-to-pointer conversion.
Zero or one conversion from the following set: integral promotions, floa...
Storing sex (gender) in database
...alue is much easier (and better practice) to create a lookup table for, in order to enforce referential integrity, and can correlate 1-to-1 with an enum, so there is parity in storing the value in memory within the application or in the database.
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MongoDB vs. Cassandra [closed]
...s of data size. It's feature set is minimalistic, little beyond that of an ordered key value store. MongoDB is a heavily featured (and fast) document store at the cost of durability and guarantees about writes persisting (since they're not immediately written to disk). They're different beasts with ...
How to check version of python modules?
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I think this can help but first install show package in order to run pip show then use show to find the version!
sudo pip install show
# in order to get package version execute the below command
sudo pip show YOUR_PACKAGE_NAME | grep Version
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Generate pdf from HTML in div using Javascript
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jsPDF is able to use plugins. In order to enable it to print HTML, you have to include certain plugins and therefore have to do the following:
Go to https://github.com/MrRio/jsPDF and download the latest Version.
Include the following Scripts in your proje...