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 – … Read more
objective-c
Convert NSArray to NSString in Objective-C
I am wondering how to convert an NSArray [@”Apple”, @”Pear “, 323, @”Orange”] to a string in Objective-C. 9 Answers 9
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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
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 … Read more
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, … Read more
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, … Read more