Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 4 years ago. Improve this question One of Xcode 5’s new features … Read more
In Cocoa, if I want to loop through an NSMutableArray and remove multiple objects that fit a certain criteria, what’s the best way to do this without restarting the loop each time I remove an object? Thanks, Edit: Just to clarify – I was looking for the best way, e.g. something more elegant than manually … Read more
For the most part with ARC (Automatic Reference Counting), we don’t need to think about memory management at all with Objective-C objects. It is not permitted to create NSAutoreleasePools anymore, however there is a new syntax: @autoreleasepool { … } My question is, why would I ever need this when I’m not supposed to be … Read more
An Xcode beginner’s question: It is my first experience with Xcode 4.6.3. I am trying to write a very simple console program, that searches for paired BT devices and prints them to an NSLog. It builds with the following error: Undefined symbols for architecture x86_64: “_OBJC_CLASS_$_IOBluetoothDevice”, referenced from: objc-class-ref in main.o ld: symbol(s) not found … Read more
This question already has answers here: Closed 9 years ago. Possible Duplicate: Best practices for validating email address in Objective-C on iOS 2.0? I am developing an iPhone application where I need the user to give his email address at login. What is the best way to check if an email address is a valid … Read more
I have an iOS project using CocoaPods. Everything was working smoothly until another developer started to work on the same project. He made some changes (only to code as far as I know) and made a new branch in the repo. I have checked out his branch and tried to build it, but I am … Read more
Does @synchronized not use “lock” and “unlock” to achieve mutual exclusion? How does it do lock/unlock then? The output of the following program is only “Hello World”. @interface MyLock: NSLock<NSLocking> @end @implementation MyLock – (id)init { return [super init]; } – (void)lock { NSLog(@”before lock”); [super lock]; NSLog(@”after lock”); } – (void)unlock { NSLog(@”before unlock”); … Read more
Can someone briefly explain to me how ARC works? I know it’s different from Garbage Collection, but I was just wondering exactly how it worked. Also, if ARC does what GC does without hindering performance, then why does Java use GC? Why doesn’t it use ARC as well? 6 Answers 6
How do I test whether an object is an instance of a particular class in Objective-C? Let’s say I want to see if object a is an instance of class b, or class c, how do I go about doing it? 6 Answers 6
How can I execute a terminal command (like grep) from my Objective-C Cocoa application? 12 Answers 12
