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“Application tried to present modally an active controller”?
...oller setViewControllers:[NSArray arrayWithObjects:vc1, vc2, vc3, nil]];
Now you are trying to do something like this:
[tabBarController presentModalViewController:vc3];
This will give you an error because that Tab Bar Controller has a death grip on the view controller that you gave it. You ca...
Group by multiple columns in dplyr, using string vector input
...as the expression is wrapped in a call to vars().
– knowah
Aug 15 '19 at 14:13
@Khashir yes, this answer still works @...
Hidden features of mod_rewrite
...
Dude, totally the best article on the internet now on mod rewrite. I hate that thing. Im a lighttpd heretic because of how much i hate mod_rewrite.
– Kent Fredric
Nov 13 '08 at 1:20
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Is it good style to explicitly return in Ruby?
......
def plus_one_to_y(x)
@y = x + 1
puts "In plus_one_to_y"
end
Now the function is broken if anything expects a returned value. If nothing expects a returned value, it's fine. Clearly if somewhere further down the code chain, something calling this is expecting a returned value, it's g...
Could not load NIB in bundle
...ib files.
I changed it to 'Relative to project' and voila: all .xib files now are correctly
loaded in IOS simulator !
I have no clue what's the reason behind that for this odd Xcode4 behavior but maybe it's worth to make an attempt ?
...
Case objects vs Enumerations in Scala
...ons are a bit clumsy in Scala and have the feel of an awkward add-on, so I now tend to use case objects. A case object is more flexible than an enum:
sealed trait Currency { def name: String }
case object EUR extends Currency { val name = "EUR" } //etc.
case class UnknownCurrency(name: String) exte...
Renaming xcode 4 project and the actual folder
I know how to rename the project in Xcode 4, but how do you rename the source folder? The thing is that renaming the project in Xcode, does only rename within Xcode (Though it is progress compared to previous) - but why Xcode is not renaming the folder in the filesystem I don't know.
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XML serialization in Java? [closed]
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2008 Answer
The "Official" Java API for this is now JAXB - Java API for XML Binding. See Tutorial by Oracle. The reference implementation lives at http://jaxb.java.net/
2018 Update
Note that the Java EE and CORBA Modules are deprecated in SE in JDK9 and to be removed fro...
Why are Standard iterator ranges [begin, end) instead of [begin, end]?
... loop iterating over an array of size N is "for(i=0;i<N;i++) a[i]=0;". Now, you can't express that directly with iterators - many folks wasted time trying to make < meaningful. But it is almost equally obvious to say "for(i=0;i!=N;i++)..." Mapping 0 to begin and N to end is therefore conven...
Regex lookahead, lookbehind and atomic groups
...ume any characters so that search for REGEX_2 starts at the same location. Now REGEX_2 makes sure that the string matches some other rules. Without look-ahead it would match strings of length three or five.
Negative lookahead
Syntax:
(?!REGEX_1)REGEX_2
Match only if REGEX_1 does not match; af...