objective-c Archives

C++, Programming

IT Nursery

OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection

I successfully implemented the OpenCV square-detection example in my test application, but now need to filter the output, because it’s quite messy – ...

June 4, 2022
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objective-c, Programming

IT Nursery

Convert NSArray to NSString in Objective-C

I am wondering how to convert an NSArray...

June 3, 2022
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objective-c, Programming

IT Nursery

Is it possible to refresh a single UITableViewCell in a UITableView?

I have a custom UITableView using UITableViewCells. Each UITableViewCell has 2 buttons. Clicking these buttons will change an image in a UIImageView within ...

June 3, 2022
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ios, Programming

IT Nursery

UITableViewCell show white background and cannot be modified on iOS7

I’ve implemented a custom table view cell class that inherit from UITableViewCell. The tableview contains a background image, so I want cell’s background ...

June 3, 2022
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objective-c, Programming

IT Nursery

How do I pass multiple parameters in Objective-C?

I have read several of the post about Objective-C method syntax but I guess I don’t understand multiple names for a method. I’m ...

June 3, 2022
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objective-c, Programming

IT Nursery

What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?

I was going through the release notes for Xcode 4.4 and noticed this: LLVM 4.0 Compiler Xcode now includes the Apple LLVM Compiler ...

June 3, 2022
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objective-c, Programming

IT Nursery

Convert to absolute value in Objective-C

How do I convert a negative number to an absolute value in Objective-C? i.e. -10 becomes 10? 3 Answers 3

June 3, 2022
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ios, Programming

IT Nursery

How can I load storyboard programmatically from class?

My problem is that I was looking for way to use both storyboard and xib. But I can’t find proper way to load ...

June 3, 2022
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objective-c, Programming

IT Nursery

In Objective-C, what is the equivalent of Java’s “instanceof” keyword?

I would like to check whether an object (e.g. someObject) is assignable (cast-able) to a variable of another type (e.g. SpecifiedType). In Java, ...

June 3, 2022
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objective-c, Programming

IT Nursery

What’s the Best Way to Shuffle an NSMutableArray?

If you have an NSMutableArray, how do you shuffle the elements randomly? (I have my own answer for this, which is posted below, ...

June 3, 2022
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