#xcode4.2

How to: Objective-C: Why is autorelease (@autoreleasepool) still needed with ARC?

Objective-C: Why is autorelease (@autoreleasepool) still needed with ARC?

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…

Fixed Can't install Ruby under Lion with RVM – GCC issues #dev #it #as nwer

Can’t install Ruby under Lion with RVM – GCC issues

Most questions regarding this problem are due to missing Xcode; I have Xcode 4.2 installed.

Install attempt:

rvm install 1.9.3 Installing Ruby from source to: /Users/jamie/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)... ruby-1.9.3-p0 - #fetching ruby-1.9.3-p0 - #extracted to /Users/jamie/.rvm/src/ruby-1.9.3-p0…

How to: Some questions about Automatic Reference Counting in iOS5 SDK

Some questions about Automatic Reference Counting in iOS5 SDK

I’m currently developing an app for iPad. The development started for iOS 4.2 and is now continuing (and I think will be completed) for iOS 4.3. I just read about ARC in iOS 5, and basically I understood that we will never need to release and retain objects anymore. My questions are:

If I decide to upgrade to iOS 5, do I need to…

How to: Can't install Ruby under Lion with RVM – GCC issues

Can’t install Ruby under Lion with RVM – GCC issues

Most questions regarding this problem are due to missing Xcode; I have Xcode 4.2 installed.

Install attempt:

rvm install 1.9.3 Installing Ruby from source to: /Users/jamie/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)... ruby-1.9.3-p0 - #fetching ruby-1.9.3-p0 - #extracted to /Users/jamie/.rvm/src/ruby-1.9.3-p0…

You just install/upgrade to XCode 4.2 to build app for iOS 5 like me and you encounter strange compilation errors like

error: unable to create '/Users/username/Library/Developer/Xcode/DerivedData/xxx' (Permission denied)

After looking on Google I found people saying that the solution is to change right on /Users/login/Library/Developer/Xcode to 777 (with a chmod). But in my case the real problem is that the folder is owned by the root and not my user ... so in fact I have to change the owner and not the mode ... my solution is :