xcode4.5 | 易学教程

How does this cause deadlock (once in a while) and how do I unravel this

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问题 @synchronized (self.class) { fetchedObjects = [moc executeFetchRequest:request error:&error]; } moc is a managedObjectContext It can be the moc that correspond to the main thread. That moc is the parent of all MOC. The other moc are just children. Sometimes when the child do executeFetchRequest it will also make the parent moc do the same executeFetchRequest. What I often see is outside main thread: @synchronized (self.class) { fetchedObjects = [moc executeFetchRequest:request error:&error];

SDKROOT path for latest SDK

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I am using Xcode to build an old code and specify SDKROOT=/Developer/SDKs/MacOSX"${HOST_VERSION}".sdk/ I want to specify SDKROOT for latest SDK that comes pre-installed (?) on the system. e.g. I am on 10.8 already and I want to specify SDKROOT with -syslibroot, but there is no such SDK in /Developer/SDKs/ . Should i just ignore syslibroot altogether if SDK_VERSION == HOST_VERSION ? Newer Xcode versions have the SDKs inside the Xcode.app bundle, e.g. /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk You get the list of installed SDKs together

how to highlight countries in ios maps

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I am building an app in which I have to highlight some countries dynamically in the world map. In short I want to customize the whole view of ios maps as shown in the images. can this be done using MapKit or is there any other method. Thanks in advance incanus You want to look into the Mapbox iOS SDK which will allow you to do this and more with a MapKit-like API. In particular, you will want to quickly make a custom map with TileMill using the provided Natural Earth data set for world country borders, enable UTFGrid interactivity so that the tapped regions can be identified, and use the

Finding documentation in XCode 4.5

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问题 I'm very used to option clicking on something in XCode, and then clicking the "notebook" icon in the top right, to bring up the appropriate documentation (see the image below). Where has this icon gone in XCode 4.5? (i.e. how do I get to the documentation in 4.5?) 回答1: If you click on the link in the reference section of the popup, it will take you to the documentation section of organizer. I'm not sure if this is what you are looking for as I have never used the feature pre 4.5. Just tested

Can't exclude user interface state from commit in xcode

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I can't exclude user interface state file from commit. Every time I'm trying to push to github it asks me to commit first and insert user interface state file into the changes (even if I didn't move the mouse or interface at all it still is shown to commit!). I tried different methods, described in other similar topics. For example, I tried to add all possible cases of user interface into the .gitignore in root, like this: *.xcuserstate project.xcworkspace xcuserdata UserInterfaceState.xcuserstate project.xcworkspace/ xcuserdata/ UserInterface.xcuserstate It didn't work. I tried to clean the

Python installation in Mac OS X virtual environment that includes a framework that I can include into Xcode?

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I like to use Python with numpy, scipy and some other packages. I am an absolute Python beginner and have some issues with the installation under Mac OS X. I am following these two tutorials to install python: 1 and 2 . Here, HomeBrew is used to install Python (with pip) and virtualenv. I do not have an opinion about what is better, MacPorts, HomeBrew, Fink... I just found this tutorial inspiring confidence. If I understand things correctly, OS X system Python, which I should never touch, is under /System/Library/Frameworks/Python.Framework. And I cannot use this one in Xcode because it does

OCR: Image to text?

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Before mark as copy or repeat question, please read the whole question first. I am able to do at pressent is as below: To get image and crop the desired part for OCR. Process the image using tesseract and leptonica . When the applied document is cropped in chunks ie 1 character per image it provides 96% of accuracy. If I don't do that and the document background is in white color and text is in black color it gives almost same accuracy. For example if the input is as this photo : Photo start Photo end What I want is to able to get the same accuracy for this photo without generating blocks. The

UIPageViewController using Storyboard and Xcode 4.5

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问题 I want to ask some question about Xcode 4.5. I am creating app with storyboard. This app has UIPageViewController . But if I want to define identifier of UIViewController in IB of storyboard, there is no place for it anymore. Can you please tell me, where can I simple define (using IB) identifier of view controller? 回答1: It seems that in XCode 4.5 Identifier below Attributes inspector has moved to Storyboard ID below Identy inspector. 来源： https://stackoverflow.com/questions/12471429

build error when add Admob in iOS app

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问题 I tried lots of source code and many questions here but no solution is working for me. When I tried to add admob to my existing project I got the following error in Xcode, please see the screenshot : I have all frameworks such as store kit and others. See the second screenshot : I have added iAd network without any problems, but I'm unable to add admob. Please help In case the image is not clear please see the error text here : ld: warning: directory not found for option '-L/Users

In Objective-c how can we have a variable whose scope is the whole class (but doesn't include subclasses)

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I created tons of subclasses of UITableViewCell. Each of which is a subclass of an additional BGBaseTableViewCell class. When asked for height, I think it'll be useful to tell users what's the typical size of the UITableViewCell. One way to do it is to specify that twice. One when I design the UITableViewCell in xib, and the second time when I hard coded the typical size. This is a design flaw because then I will need to remember to change the hard coded typical size when I change the stuff in xib. I don't want that. I want to design my UITableViewCell in xib and when the class is initialized