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How do I show/hide a UIBarButtonItem?

... Save your button in a strong outlet (let's call it myButton) and do this to add/remove it: // Get the reference to the current toolbar buttons NSMutableArray *toolbarButtons = [self.toolbarItems mutableCopy]; // This is how you remove the button from the toolbar and animate it [toolb...
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Should I call Close() or Dispose() for stream objects?

... void Close() { this.Dispose(true); GC.SuppressFinalize(this); } And StreamReader is: public override void Close() { this.Dispose(true); } The Dispose(bool disposing) override in StreamReader is: protected override void Dispose(bool disposing) { try { if ((this.Clos...
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'git add --patch' to include new files?

...: If you use this with an empty new file, git will not be able to patch it and skip to the next one. share | improve this answer | follow | ...
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Can I change the color of auto detected links on UITextView?

I had a UITextView that detects phone numbers and links, but this overrides my fontColor and change it to blueColor . Is there a way to format the color of auto detected links, or should I try a manual version of this function? ...
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Time complexity of Euclid's Algorithm

...ow what happens over two iterations: a', b' := a % b, b % (a % b) Now a and b will both decrease, instead of only one, which makes the analysis easier. You can divide it into cases: Tiny A: 2a <= b Tiny B: 2b <= a Small A: 2a > b but a < b Small B: 2b > a but b < a Equal: a ==...
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select * vs select column

If I just need 2/3 columns and I query SELECT * instead of providing those columns in select query, is there any performance degradation regarding more/less I/O or memory? ...
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Send attachments with PHP Mail()?

...cript from here: http://github.com/PHPMailer/PHPMailer Extract the archive and copy the script's folder to a convenient place in your project. Include the main script file -- require_once('path/to/file/class.phpmailer.php'); Now, sending emails with attachments goes from being insanely difficult t...
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Subclipse svn:ignore

...pse. I'm using subclipse for connecting to my SVN. There are some folders and files I would like to add to svn:ignore, but it's grayed out. Is there an easy way to get subclipse to ignore files and directories? ...
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What is the use of the @Temporal annotation in Hibernate?

...st be specified for persistent fields or properties of type java.util.Date and java.util.Calendar. It may only be specified for fields or properties of these types. The Temporal annotation may be used in conjunction with the Basic annotation, the Id annotation, or the ElementCollection annotation (...
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Is a LINQ statement faster than a 'foreach' loop?

I am writing a Mesh Rendering manager and thought it would be a good idea to group all of the meshes which use the same shader and then render these while I'm in that shader pass. ...