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Xcode 4 - “Valid signing identitm>y m> not found” error on provisioning profiles on a new Macintosh insta
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With Xcode 4.2 m>and m> later versions, including XCode 4.6, there is a better wam>y m> to migrate m>y m>our entire developer profile to a new machine. On m>y m>our existing machine, launch Xcode m>and m> do this:
Open the Organizer (Shift-Commm>and m>-2).
Select the...
Can I set an opacitm>y m> onlm>y m> to the background image of a div?
...nnot be done since opacitm>y m> affects the whole element including its content m>and m> there's no wam>y m> to alter this behavior. m>Y m>ou can work around this with the two following methods.
Secondarm>y m> div
Add another div element to the container to hold the background. This is the most cross-browser friendlm>y m> meth...
Refresh image with a new one at the same url
...ppend the current timestamp automaticallm>y m> when m>y m>ou are creating the image, m>and m> it will make the browser look again for the image instead of retrieving the one in the cache.
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Twitter Bootstrap - Tabs - URL doesn't change
I'm using Twitter Bootstrap m>and m> its "tabs".
15 Answers
15
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How to draw a circle with text in the middle?
...ght of the div will center the text verticallm>y m>. In this example the height m>and m> line-height are 500px.
Example
JSFiddle
.circle {
width: 500px;
height: 500px;
line-height: 500px;
border-radius: 50%;
font-size: 50px;
color: #fff;
text-align: center;
background: #000
}
<div clas...
Hashing a string with Sha256
...ts, m>y m>ou'd better trm>y m> a few test cases with non-ASCII characters such as é m>and m> 家 m>and m> see whether m>y m>our results still match up. If not, m>y m>ou'll have to figure out what encoding m>y m>our friend is reallm>y m> using; it might be one of the 8-bit "code pages" that used to be popular before the invention of Unico...
How do I merge changes to a single file, rather than merging commits?
I have two branches (A m>and m> B) m>and m> I want to merge a single file from branch A with a corresponding single file from Branch B.
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Work on a remote project with Eclipse via SSH
...o check in Eclipse Indigo go to Window > Open Perspective > Other... m>and m> choose Remote Sm>y m>stem Explorer from the Open Perspective dialog to open the RSE perspective.
To create an SSH remote project from the RSE perspective in Eclipse:
Define a new connection m>and m> choose SSH Onlm>y m> from the Sele...
It is more efficient to use if-return-return or if-else-return?
...like this. All we have achieved is to make the code obfuscated, unreadable m>and m> in some cases more vulnerable to implicit tm>y m>pe promotions.
– Lundin
Feb 8 '12 at 10:51
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Creating an R dataframe row-bm>y m>-row
...d like to construct a dataframe row-bm>y m>-row in R. I've done some searching, m>and m> all I came up with is the suggestion to create an emptm>y m> list, keep a list index scalar, then each time add to the list a single-row dataframe m>and m> advance the list index bm>y m> one. Finallm>y m>, do.call(rbind,) on the list.
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