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Swift - class method which must be overridden by subclass
Is there a standard way to make a "pure virtual function" in Swift, ie. one that must be overridden by every subclass, and which, if it is not, causes a compile time error?
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Changing navigation bar color in Swift
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Navigation Bar:
navigationController?.navigationBar.barTintColor = UIColor.green
Replace greenColor with whatever UIColor you want, you can use an RGB too if you prefer.
Navigation Bar Text:
navigationController?.navigationBar...
What's a quick way to test to see a file exists?
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StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
})...
Applying a function to every row of a table using dplyr?
...rows
How we add the output of the function is controlled by the .collate param. There's three options: list, rows, cols. When our output has length 1, it doesn't matter whether we use rows or cols.
iris %>%
by_row(.collate = "cols", ..f = function(this_row) {
this_row[1:4] %>% unlist...
Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions prop
I have developed an application using Entity Framework , SQL Server 2000, Visual Studio 2008 and Enterprise Library.
35 ...
Get month name from Date
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Shorter version:
const monthNames = ["January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
];
const d = new Date();
document.write("The current month is " + ...
Reading CSV file and storing values into an array
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You can do it like this:
using System.IO;
static void Main(string[] args)
{
using(var reader = new StreamReader(@"C:\test.csv"))
{
List<string> listA = new List<string>();
List<string> listB = new List<string>();
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如何高效的学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...合适的书，所以我直接去它的官方网站(http://facebook.github.io/react/) ，把Getting Started里面的文章快速的浏览了一遍，基本上算是有了个大概的了解。而且现在网络上相关文章也比较多，通过搜索，也能找到很多相关的文章和资料。
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How to process SIGTERM signal gracefully?
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A class based clean to use solution:
import signal
import time
class GracefulKiller:
kill_now = False
def __init__(self):
signal.signal(signal.SIGINT, self.exit_gracefully)
signal.signal(signal.SIGTERM, self.exit_gracefully)
def exit_gracef...
How to re-sign the ipa file?
How do I sign the .ipa file with a provisioning profile after I generate an IPA like the following with a different provision profile? I would like to sign the IPA with an ad-hoc provisioning profile for beta testing, and then re-sign the exact IPA with an app submission provisioning profile for the...