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When developing a project in Objective-C everything is smooth, SourceKitService is taking 0% of CPU, autocompletion is almost instant.
But if I change a Swift code a bit, it takes many seconds to do anything (highlight syntax and check, whisper etc.) Or when i want to see an implementation of something with cmd shortcut, again SourceKitService on xxx% of CPU and takes seconds. Changing a character in code leads to 10 seconds of waiting to see everything is ok is too much.
Sure I tried to delete derivedData, ModuleCache, com.apple.dt.Xcode etc. as advised but it is not permafix, still happening, slowing me down.
Does anybody know how to really fix this issue or at least improve it?
I would recommend trying the Build Time Analyzer to see if there are specific things slowing down the compiler. In my experience the main problem is complex Type inference, usually from multiple chained .maps, complex associated types and, generics.
The Swift compiler is doing a lot more and is quite a bit newer than the Objective-C compiler so it unlikely it will be as stable/fast for quite some time. I know compile time and IDE stability is something they're aware is a problem and are working to improve. Hopefully now that we have (promised) source compatibility some of this things will be fixed our greatly improved within the next year. Unfortunately we'll probably have to jump through some hoops until that point.
In this case it had something to do with CocoaPods. It was copying .h files into the build directory and SourceKit was getting confused.
I added this script to my project, and SourceKit stopped freaking out a bit, but it is still ridiculously slow.
function removeHeaders() {
find $BUILD_ROOT/Debug-iphonesimulator/ -name '*.h' -exec rm -f {} \;
}
removeHeaders
Ref. Xcode Swift Syntax Highlighting and Code Completion Completely Broken
Note: Unfortunately this solution breaks debugging console and archiving. So remove the script if it is needed.
I am using Swift 2.3 for a project and just downloaded my first pod, I get the following warning and not sure of the correct answer here?
From my experience, whenever there is a "Update to recommended settings" warning, just do it. I think all it does is making your life easier. Since it is the "recommended" settings, you probably should do it.
Every time I do it, nothing wrong happens after, so I don't think you need to worry about that. If you do, just revert the commit by using version control.
There is a new autocomplete in Xcode. Probably might be useful because it checks not only beginning of names etc. But I found that very often it doesn't find a class name or a const name at all etc. I need to type in entire name by myself. Over all I found it makes my life harder and coding more time consuming. Is there a way to switch to the old way it used to work?
Xcode 7.3.1
In Xcode > Preferences > Text Editing
uncheck Enable type-over completions
restart Xcode
It seems that clearing the checkbox "Enable type-over completions" in XCode -> Preferences -> Text Editing does the trick. At least in my case autocompletion fell back to a sort of old way, so it could autocomplete the class name that I had to type in manually before that.
This is by no means an adequate solution, BUT it has allowed me to (barely) maintain my sanity the past few days:
After every build, you need to trash your Derived Data folder. You can find this folder in Xcode > Preferences > Locations > Derived Data. Just trash the whole thing and it'll kick off a re-indexing step that should restore proper autocomplete functionality.
Unfortunately, I've found that once I build, the autocomplete behavior reverts to its broken state.
just open Xcode derived data folder and delete the folder
/Users/yourUserName/Library/Developer/Xcode/DerivedData
then restart Xcode, now autocompletion works like a charm
I have the impression that some 'parts' of autocompletion simply fail after a while. I use to restart the Mac to get it back working. But sometimes it fails quite soon again.
Maybe the answer of #Alex Bykov combined with a restart will do the trick.
Anyway: auto-completion of Xcode always was crap. AppCode used to get it much better. Unfortunately not yet with swift.
Closed Xcode, opened Xcode, let it index, it worked.
it doesn't find a class name
As a work-around, you can try to press
Command + Shift + K and Command + B
Several times，it works temporarily.
Xcode 7.3.1
I will share another posible reason, that after couple of days we found out. We have multiple schemes, and in one of them, the bridging header was importing a file that didn't exist anymore. So, it didn't break while compiling and running (the header belongs to another scheme) but it caused the autocompletion to break (couldn't find any objective-c class).
Hope it would help someone!
After having tried different methods:
Delete Derived Data
Switching Module Enabled off in Build Settings
Full Clean
Relaunch
Only this worked:
Find any commented out (/* abc */) code after #end in your files and delete.
Credit to Max_B:
https://forums.developer.apple.com/thread/7439
In my case, other projects were auto-completing correctly. If all your projects fail to correctly predict code, then it might be a different issue, and the other answers might work.
I ran into this issue while trying to make an OS X app and I was able to fix this issue by making sure that the Xcode 7.3 documentation and the OS X 10.11.4 documentation was actually downloaded. Doing this fully restored my autocomplete functionality. My full instructions are below as well as in my answer to a similar question: https://stackoverflow.com/a/39420664/3444925
I had this problem myself and after looking through all the other similar questions & answers about this, I couldn't find a solution. However, I finally found what worked for me.
Go to Xcode -> Preferences -> Components. There you will probably find a screen that looks like the following:
This shows that the documentation has not has not been downloaded and therefore, any attempts to re-index or re-build the application without downloading the documentation would prevent you from being able to use the autocompletion functionality.
Once I downloaded the Xcode 7.3 Documentation and the OSX 10.11.4 Documentation, this was enough for me to get the autocomplete functionality back (I was trying to build an OS X app, so feel free to download as much documentation as is relevant for you).
I didn't run into this until I created a couple of new class files. Other classes worked fine, but autocomplete would NOT work for anything in the new files...
FIX (for me) - I had to add those files to ALL of my targets, including the unit test targets even though I wasn't using them yet.
do you face also the problems with Xcode 4 autocomplete feature that used to work great on version 3.x.x?
I've imported in the Prefix some classes and Xcode doesn't want to help me with the code entry. I have to manually add above #implementation
import "myclass.h"
To make Xcode help me entering the class name, properties, methods, macros defined in the myclass.h. On 3.x.x I could import those important classes once in the prefix and the autocomplete feature worked without any problems anywhere in the project.
Sometimes Xcode goes even more stupid, it doesn't want me to help typing the classes like UIButton, UIView and the common method like
addTarget:action:forControlEvents: for my buttons.
Do you also has the problems I mentioned in the Xcode 4, any solutions?
I was able to correct this issue by setting Precompile Prefix Header to No in the build settings.
EDIT 3: Note that this indexing issues has mostly disappeared in recent versions of Xcode (4.1 for sure, latest pre-Lion 4.0.x I think), and that I do not use this workaround anymore, using pch... And in fact not using Xcode anymore... AppCode ftw! :)
An easy, but quite dirty workaround imho is not using precompiled header .pch file to do global includes, but instead go a global header .h, that you include... everywhere. That way indexing will work flawlessly...
I Know that's dirty, don't downvote me please :) I'll delete this answer as soon as someone propose something better! Which I would love.
Off-topic, but related, read somewhere llvm2 is not supposed to get a gain speed with .pch files. which kind of deprecate them.
EDIT: Just checked to be sure of my answer, latest version of Xcode (4.0.1 when writing this) looks like fixing that bug for me. Did you upgrade to latest version?
EDIT 2: Removed my global import header .h, all its references, and moved my global imports into .pch file... That doesn't work as well I expected, latest Xcode 4.0.1 improved on this part but still have some cases where it fails. (I'm working on a project with hundreds of files). Looks like cleaning index/restarting Xcode fix it. I might consider reverting to my dirty workaround...
I have found that changing compilers, building, and then changing back, and building again works relatively consistently. Wrote a post about it on my blog:
http://rhappsody.wordpress.com/2011/08/03/xcode-4-code-colouring-and-auto-completion/
I found that sometimes the autocompletion gets broken when dealing with stuff defined in the prefix header. One way to get Xcode to index those again correctly is to use the touch command in the Terminal, e.g.:
touch /Users/someguy/Document/Foo-App/Foo-Prefix.pch
Or add a new line to the prefix for the same effect. Xcode then gets busy reindexing and things work again.
I've faced the same issued as soon as I moved to XCode4. What I realised was that I needed to install iOS's documentation to have the code completion fully working.
Go to Xcode -> Preferences -> Documentation and click GET on the iOS 4.3 Documentation. In the iTunes-style status window, the download progress will be shown.
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Closed 10 years ago.
As most of you have probably seen, Xcode 4 has been released officially today. Now I know that plenty of devs out there have been using the preview versions, and it'd be great if people could post any great tips, tricks, or keyboard shortcuts they've learned using those version now they're no longer under NDA. This could be especially useful for those upgrading from Xcode 3 (like me, downloading right now).
Note: Apple have released a 'transition guide' that has plenty of stuff in about getting from version 3 to version 4, but I bet there are loads of great tricks people out there have learned that aren't in there.
I liked reading this Blog: Pilky.me - Xcode 4: the super mega awesome review.
It presents a good comparison, I especially liked his conclusion near the end.
Currently I have only one tip for Xcode 3 users - don't use xcode 4 unless you have free time to start learning again and/or are willing to report lots of bugs. Wait at least until 4.1. There are still lots of bugs unresolved. Nothing is stable. Also Xcode 4 advertises as having single window ui which is nice, but is unstable as U238. Also - it's probably single thing that is good about new Xcode 4. So here are some of my headaches currently:
There is no possibility to commit whole project (except for separately selected modified files);
There is no possibility to push (if SMC is git). At least I haven't found that;
Since symbol indexing is broken you cannot:
see normal syntax highlight;
jump to certain symbol definitions;
Jump bar is just one big misunderstanding:
Previously comfortable Ctrl+2 shortcut from Xcode 3 which lists method names and pragma marks has now become finger breaking Ctrl+6 (emacs user's rejoice</flamewar>).
There is no direct button to switch between interface and implementation files.
If you have 13.3" macbook[pro] - don't even try to use navigators with utilities (inspectors or libraries).
Also transition guide is made for working Xcode 4 which it is far from.
Update 1:
There is no such thing as "Build & Run". Only build, build for running, build for testing, build for profiling, build for archiving. Then just run without building and run without profiling. AFAIK it supposed to be easier so summa summarum - 8 actions instead of 1. Go figure.
So these are only few of my instantly found glitches for Xcode 4.
P.S. probably will be updating this in upcoming few days.
#Ohmu: The 3-finger up/down trackpad/magic mouse swipe gesture for switching between header (.h) and implementation (.m) files still works a treat.
XCode 4 has a lot of awesome new features. I'd recommend starting to adjust to it by watching last year's WWDC2010 videos - they dedicated a lot of time to going through some of the new stuff.
I love the new assistant mode - it makes it really easy to navigate through your interface/implementation files. This mode also allows you to create your user interfaces alongside your controller classes, which makes development both easier and more effective than doing it in two completely separate programs!
The jump bar (found along the top of your source code) is a really fast way to leap about your project, making it really easy to get exactly to the place in your code that you're interested in.
The version control viewer makes it really easy to track changes. I now use SVN for all my projects, even the ones I work on alone because it really makes it clear to see how the project has evolved over time.
There are settings to set how your layout changes and what's displayed when you build, when you run, when you end a run etc. etc. which I'm also finding really useful because you want to see different things when you'e debugging to when you're back in your code. It's really nice that Xcode helps you easily arrange your layout to exactly how you want for different scenarios.
The code templates (which can be found in the toggleable right-hand-side toolbar) are also really useful, and you can create your own in order to quickly get code you often write down.
Some more subtle things that I've grown to like:
The 'Fix It' feature works really well for quickly replacing typos. I find I don't even have to read the correction Fix It will make because the fix is so natural.
Control-I short cut for re-indenting code. This is really useful if you add a new pair of braces round your code and you want to quickly reformat. I don't think there was a nice shortcut for this in Xcode 3.
Hitting the escape key to bring up autocomplete suggestions seems to bring up much more helpful suggestions in C++, and looks a lot more beautiful all round!
On reliability, I've been using a combination of Xcode 4 and Xcode 3 since Xcode 4 first entered beta. Whenever Xcode 4 packed in for me or wouldn't let me continue with what I wanted to do then I'd just switch over to Xcode 3 as the two are completely compatible. What I got was a really nice transition period and now I'm completly using the latest build (first week of March) so I think it's very stable.
For people that don't like change, this update is going to be hard. It'll be particularly challenging as a lot of the keyboard shortcuts have changed to make new for a lot of new features. The most obvious difference that people are going to oppose is the new all-in-one window layout. I'm sure people will get used to it over time and realize that this way of viewing everything to do with your project is much more effective both in real estate and in navigation terms.
Enjoy using Xcode 4, it really is an amazing improvement over the last version, and it continues to add to the awesome time I'm having writing Mac and iOS applications. :D
More shortcuts than you can shake a stick at here:
http://cocoasamurai.blogspot.com/2011/03/xcode-4-keyboard-shortcuts-now.html
However, completeness is obscuring clarity. For example, I can't straightaway see the shortcut for toggling between a header file and its associated method file. so I recommend one shortcut per answer, and the votes will filter out the best ones.
If you need to open plist files when you are not coding you should keep a copy of XCode3/Applications/Utilities/Property List Editor.
Property List Editor opens within the blink of an eye. But XCode4 takes minutes until it finally shows the plist file.
I guess Apple wants me to replace my 2008 MBPro
NB: Apple's official transition guide has moved/been updated (they didn't update the URL, sigh). It's now at:
http://developer.apple.com/library/mac/documentation/IDEs/Conceptual/Xcode4TransitionGuide/Xcode4TransitionGuide.pdf
The only way for me to like XCode4 is thinking it as a different product.
There's NO evolution over XCode3, just lots of drawbacks for the way I use it.
Who changes (almost all) shortcuts between version of the same software?
Why do I have to learn back from zero how to use and configure my projects? Sounds like punishment, not evolution.
How good is XCode4 for multiple monitors usage? It was clearly designed for a single monitor user, but unlike Xcode3, its UI cannot be as easily (and persistently) changed.
Although it can be disabled (and must), auto code check for errors... So we're back on VB6 now?
I'm a BIG Apple fan, though XCode4 falls short on developer satisfaction due to its lack of customization (compared to XCode3).
Not using XCode3 as a comparison, it is indeed a good IDE.
A frustrated developer,
Cheers.
Risky business: Moving to Xcode 4 will introduce you to a whole new level of strange behaviour, bugs, and pain. E.g. having third-party frameworks (like Three20) in your app, means that you won't be able to build a proper archive, without jumping through various levels of hoops. Don't move to Xcode 4 yet, if you can. If you do, there are some tips below.
Keep your archives safe: ...prior to installing Xcode 4 (from 3). You will lose them (most likely) and with them lose your ability to symbolicate your crash logs.
Adding frameworks: It took me a while to figure this out, and it's nowhere in the docs. You cannot simply do this by right-clicking on the project or a group (like in Xcode 3). You need to go to the project view, select your target and go to "Build Phases" tab. Frameworks can be managed under the "Link Binary with Libraries" section.
Setting target dependencies: Similar to the above, in the "Target Dependencies" section of the "Build Phases" tab.
Delete action-BEWARE: "Delete" (instead of "Remove Reference Only") directly erases the file from your drive. It doesn't go into the Trash, so you cannot recover it.
Text Editor: Here a couple of good ones:
Cmd-clicking on a class name will take you to the implementation (or header) file of that class, cmd-clicking on an object will take you to where the object is declared.
Alt-clicking will open a documenation popup for the object you clicked on.
3-finger sideways gesture to left is the Back button, and goes to your previous file. Gesture to right goes to your next file in the stack. (not sure if this was true in XCode3)
http://pragmaticstudio.com/screencast-tags/xcode4
After watching these great little videos, I instantly warmed to XCode4
They have really sorted it out big-time in so many different places, making conceptual changes such as:
one window = NICE
TextWrap
removed annoying 'stop running + rerun' dialog
good color scheme facility
CMD SHIFT O to locate a header file
The auto completion is sorted out beautifully
clear console button
search & replace NICE
new keybindings NICE
On-the-fly error checking - love it!
As you can see, I made notes over the first 2 days of using it; every time I liked something, or every time something went wrong I would jot it down.
So far I have listed 16 problems, but these are all glitches, such as the colouring system going wrong in certain situations etc... ie all minor things that will get patched up pretty soon in updates.
With the occasional crash, I am not going back to 3.x unless I absolutely have to.
The only thing which really gets my goat is that Apple STILL refuse to support incremental updates. it is totally crazy, and I hope everyone makes a lot of noise about it until they sort it out.
I wondered where per-file compiler flags had gotten to.
Spoiler: Select project, select target, select Build Phases tab, expand Compile Sources phase and rejoice.