Xcode 4 code backward compatible - xcode4

Can I create code on Xcode4 and then run this exact same code on Xcode3. In other words is it backward compatible and if not what do I have to do to ensure that I can run the code on xcode 3.

Not something I've tried. You need to check the Project Format is set to the matching Xcode 3 version. But I would still not be surprised if it didn't work. The reality is that this is Xcode's way of telling you to update your XCode 3 machine :-)
BTW, you will probably also run into a number of SDK version issues as well.

Yes, you can run the same code in XCode 3 assuming you haven't used features available in newer SDKs, not available in older XCode version.
But as #drekka said, project format will be most likely incompatible between two versions, so you'll probably need to ignore XCode 4 project upgrade warnings.

Related

Error after adding FirebaseFireStoreSwift-Beta with Swift Package Manager

I setup a new project using Firebase SDK and only get this error when I add FirebaseFirestoreSwift-Beta. I have it in other projects that was built before Mar-8th and have no issues running them but it won't work on any new projects. I have went back and watched videos to make sure I wasn't missing a step when installing. I am using Xcode 12.4
Is this an issue with the Beta or is there something I am missing on my end?
Many apologies, the issue was introduced by me.
It appears that symbol resolution has changed slightly in Swift between Xcode 12.4 and Xcode 13.
I have made a PR that fixes the compilation issue on Xcode 12.4 here:
https://github.com/firebase/firebase-ios-sdk/pull/9438
Until then, if possible, you can update to the latest version of Xcode.
If that is not possible, then if you use a package manager where you can make local edits, you can rename the variable data to something else (like d) to make it compile.
If you can't do that, then a more substantial workaround would be to fork the repository, check out the release tag, create a new branch and fix the error, then pointing your package manager to you own branch including the fix.
Another solution is of course to stay on 8.12 of Firebase until the PR above is merged and released.

iOS Realm: file does not start with MH_MAGIC[_64], fat file, but missing compatible architecture (have 'x86_64,i386', need 'x86_64'))

I have updated mac to 11.6 and xcode to 13.0. Realm could not compile so I updated it with carthage to v10.15.1. Now I get this runtime error just after the app launch:
Library not loaded: #rpath/Realm.framework/Realm
Referenced from: /Users/username/Library/Developer/Xcode/DerivedData/appname/Build/Products/Debug-iphonesimulator/RealmSwift.framework/RealmSwift
Reason: tried: '/Users/username/Library/Developer/Xcode/DerivedData/appname/Build/Products/Debug-iphonesimulator/Realm.framework/Realm' (file does not start with MH_MAGIC[_64], file does not start with MH_MAGIC[_64], fat file, but missing compatible architecture (have 'x86_64,i386', need 'x86_64')), '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/Realm.framework/Realm' (no such file), '/usr/lib/swift/Realm.framework/Realm' (no such file), '/Users/username/Library/Developer/CoreSimulator/Devices/33E61712-D8A9-4D7E-A260-5C096BE08A82/data/Containers/Bundle/Application/AC700919-F431-446F-8BEF-FF8D8E5F5BF9/appname.a
I guess the key part here is file does not start with MH_MAGIC[_64], but I could not find anything useful about the error.
I tried embedding the library and turning off the embedding, does not affect anything.
Realm has 3 targets configured to be built with Carthage (Realm, Realm iOS Static and RealmSwift)
XCode 13 deprecated a setting for building targets in a manually set order which leads the first 2 targets to be built in a non deterministic order (the 3rd one is always last as it depends on the 1st one). The order and the frequency of it changing seems to be random (it might depend on the specific XCode version)
When 'Realm' is build before 'Realm iOS Static', the fat framework replaces the one in the xcframework which leads to that error. In the other case, it's the correct one that's built second and overrides the wrong one.
I guess the solution (apart from upgrading Realm) would be to remove the target 'Realm iOS Static' from the project but it's not straightforward to do with Carthage except by forking Realm
The latest version of realm is v10.32.0. xcode 14.1 is also out.
You need to update your toolset.
The latest upgrade realm version 10.32.0 is compatible with XCode 13.1 and above. If you use the legacy build system, migrate it to the latest one and clean the derivable folder before rebuilding the code. Most of the time derivable keeps track of the older version files and makes conflicts once you update the project tools. Hope this will help

Realm support for Swift 3

So I updated to swift 3.0 and now my projects with realm 1.0.2 all give me an error.
RealmSwift compiled with older version of Swift language (2.0) than previous files (3.0)
I also tried to build a net new project and still get the build error, so I know it is not a conversion issue on the Swift side.
I found several Swift 3.0 beta users and tried to run the script to update my version to 3.0 and several other options. The last few posts appeared to use Cocoa Pods - which I don't currently use. Is that the supported fix path?
Any help or direction would be greatly appreciated.
I haven't tried it yet, but here is what should work.
Essentially, the compiler gives you a description of what went wrong. The framework was compiled with Swift 2.0, while your project or other files were compiled with Swift version 3.0 (which means you made the switch after upgrading to the new version of Xcode.
To fix this, you need to use the Realm framework compiled with a Swift 3.0 compiler. Since the Realm team doesn't yet provide a precompiled version compiled with Swift 3.0, you have to do so yourself. To do that, go to their Github repository, and follow the instructions in the README under "Building Realm":
Prerequisites:
Building Realm requires Xcode 7.3.
Building Realm documentation requires jazzy
Once you have all the necessary prerequisites, building
Realm.framework just takes a single command: sh build.sh build.
You'll need an internet connection the first time you build Realm to
download the core binary.
This should generate the Realm framework with the current compiler version, which you then just have to use to replace your current Realm framework with. After that, everything should compile as it used to.
As stated before, I don't know if this actually works, as I haven't tried it yet. I don't exactly know if Swift 3.0 is supported by Realm yet or if there are any other issues you could run into. So please let me know how this works out!

Migrating old xcode projects into latest version

I have problem with memory management and leaks(Potential leak of an object) of old xcode projects.Can i Migrate these projects to new xcode4.5 with Automatic reference counting to overcome the above issues. If this possible means how can i made it? and Is this right way or what else to do?
Yes You can definitely do that & that too with using Xcode latest version itself.
XCode is intelligent enough to change the non-ARC into ARC and also can use the latest Syntax.
Open your project into Latest version of Xcode, probably 5.0.1 & then go to menu
Edit-> Refactor-> Convert to Objective-C ARC
There are many other options under Refactor menu. You can try those.

Defines Presentation context is not available prior to xcode 4.2 [duplicate]

I'm developing an app which is iOS 4 compatible, so my deployment target is set to iOS 4.0.
Whenever I drop a UINavigationController onto a UITabBar, I get these two warnings:
warning: Attribute Unavailable: Defines Presentation Context is not available prior to Xcode 4.2.
warning: Attribute Unavailable: Defines Presentation Context on iOS versions prior to 5.0.
The UINavigationController functions as expected, in fact, the entire app runs perfectly. But these two warnings are driving me nuts!
Also, the moment I delete the UINavigationController the warnings disappear.
Just uncheck the "Defines Context" checkbox in the attributes inspector. (Double-click on MainWindow.xib, select the navigation controller, then go to View->Utilities->Attributes Inspector.) That'll get rid of the warnings.
You are getting these warnings because you are using iOS 5.0 SDK features with a 4.x deployment target.
All, if not, most of the new 5.0 hotness, including ARC and Storyboards, is completely backwards compatible with iOS 4.x (I don't remember if 4.0 or 4.3 is the lowest supported version, check the docs), it will work as intended, but Xcode is going to warn you anyways.
You should be able to disable that warning if it really bothers you, but I wouldn't. That said, Apple does not currently accept applications built/archived with the Xcode 4.2 beta for submission to the App Store. This means you need to use Xcode 4.0/4.1 in a production environment.
Before we go any further, you should know that Xcode 4.2/iOS 5 is beta software, it is under NDA (you agreed to this when you joined the Apple developer program) and cannot be discussed in the public domain. This means you won't be able get much help from places in the public eye, like StackOverflow, as good as it can be. But, since I'm here and this is a very high level question, I can help :)
In the future, if you have iOS beta questions or issues, you should hit up the Apple Developer Beta Forums (an excellent resource, always search before you post), or #iphonedev on irc.freenode.net for not-beta stuff (I'll be there, say hi!)
If you're developing an application for release on the App Store:
You need to be developing with Xcode 4.0 or 4.1, Apple will not accept applications built/archived with 4.2. (I know I repeated myself, but people seem to miss this often)
And, although 4.2b7 supports developing for older frameworks better than previous Xcode betas have (by allowing you to install previous versions of the simulator), you will still find yourself accidentally using 5.0 SDK functions all over the place, as the code completion/interface builder very aggressively favors all of the new hotness. This is because the beta is for trying new things, not stable application development.
This means you need to switch back to using Xcode 4.0/4.1 for production, if you don't have it installed, or you overwrote the stable version with the beta, do not try to install 4.0/4.1 on top of the 4.2 beta, weird things will happen and both versions will start acting really weird and and Xcode will crash at least twice as often.
The best thing to do in this situation, is to follow the below steps. Make sure you don't skip anything, otherwise you'll have to restart the whole process.
Make sure you have your code committed and pushed up,
uninstalling Xcode like this temporarily removes git. (This was an
issue for me at work once)
Download the installers for Xcode 4.0/.1, and 4.2 if you intend to keep experimenting. (if you already
have both downloaded, this whole process won't take more than 5
minutes on an SSD)
Uninstall the Xcode beta from the command line using this command:
sudo <Xcode>/Library/uninstall-devtools --mode=all (more info here)
Restart your computer (this is important, do not skip it!!!)
Install the most recent non-beta version of Xcode and resume development.
If you want to use both versions of Xcode (4.0/4.1 and 4.2):
You must install the beta AFTER 4.0/4.1 is installed, otherwise you will be overwriting new things with old things, and this will give you many, many obscure headaches. I also recommend restarting between installations.
You need to install 4.2 after 4.0/4.1, and to a different folder (I use /Xcode4beta/, don't put it within the folder that contains 4.0/4.1, either). I've found I learn about the new hotness best if I keep separate iOS5 branches of my work, and update what I can when I have some free time.
If you have the iOS5 beta installed on your phone, and Xcode 4.0/4.1 won't let you build to your phone:
This is because Xcode needs to grab the debug symbols from the phone before it can be used for devleopment, but only the Xcode beta can do this for an iOS5 beta device, so follow these steps:
Make sure your phone is plugged in and turned on, and that your provisioning profile/certificates all check out.
Close the project in Xcode 4.0/4.1.
Open the project back up in Xcode 4.2, and check organizer. You should either already have a green dot next to your phone (assuming all of your provisioning is working), or it should be gathering the debug symbols. Let this finish, and then build your project. It doesn't need to be a successful build, nor do you have to install the application to the phone, sometimes you don't even need to build, Xcode can be a fickle mistress.
Close the project in Xcode 4.2.
Open the project back up in Xcode 4.0, you should now be able to build and install to your phone as you normally would.
Xcode 4.0/4.1 should now be able to use your device for development until you restart the computer.
Resolution is here:
How can I fix "Freeform Size simulated metrics are not available prior to Xcode 4.2" warnings?
You just need to change the development version of your xib file to Xcode 4.2 (default is Xcode 4.1)
View Controller and Navigation Controller setting or options name ( attributes inspector )
Define Context ( Checked ) unchecked.

Resources