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This feature is a complete replacement for the autoresizing mask. Autolayout, available starting with OS X v10.7 Lion, uses relationships called constraints to govern the layout of objects in the user interface. Interface Builder in Xcode 4.1 adds support for the new AppKit Autolayout feature. The output type is also a new category in the assistant editor for a selected primary file. You can study the assembly output to see how the instructions were formed or ordered, to seek out better optimization patterns, or to look for compiler bugs. The assembly output is the set of instructions that the compiler generated from the preprocessed output.

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You can examine the preprocessed output to make sure that the logic in your source code is being interpreted by the preprocessor as you expect in order to debug compilation problems. The preprocessor evaluates directives in your source code (instructions starting with the pound sign (#) such as includes, defines, and conditional logic) and converts them into C code to be sent to the compiler. Xcode 4.1 introduces commands in the Product > Generate Output menu to process source files and generate the preprocessed output or assembly output.

To assign key equivalents to custom behaviors, in the Key Bindings preferences pane, select the Customized tab to find the behavior for which you want to assign a key equivalent. Once you’ve created a behavior, it appears in the Xcode > Behaviors menu. This feature allows you to create behaviors that you can invoke at any time.

You can also can design custom behaviors by defining behaviors that are triggered by menu items or their key equivalents. This feature greatly expands the power of Xcode behaviors, enabling Xcode to run a script or perform a variety of actions in response to a large number of triggers.

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Xcode 4.1 introduces new Behavior options, such as running a script, collapsing and expanding the navigator and utilities panes and the toolbar, or switching to Full Screen mode. The Behaviors preferences pane lets you specify what should happen when a variety of events occur. Compared with the GCC compiler that was the default in Xcode 4.0, LLVM-GCC provides better code generation and optimization than GCC, while being exactly source compatible with GCC 4.2. The default compiler for iOS development in Xcode 4.1 is LLVM-GCC 4.2. To rerun the check, select your project in the Project navigator and choose Validate Settings from the Editor menu. If the Issue navigator lists modernization issues, click the issue to see a dialog that explains the updates that should be made and lets you perform any or all of them.Īfter you have clicked Perform Changes, whether you choose to make all the changes or not, Xcode does not show the warning again. You can also select the project in the project navigator and choose Editor > Validate Settings. Open the Issue navigator to see whether anything in your project needs to be updated. This feature provides an easy way to make sure your projects conform to the latest SDKs and best practices.

When you open a project, Xcode 4 evaluates it to see whether there are any settings that should be updated.

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For details on how to use these features, see Xcode Help. This article describes the new features in Xcode 4.1.

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Xcode 4.6.3 fixes an issue where debugging in the iOS Simulator could hang on OS X 10.8.4. Xcode 4.6.2 is a maintenance release responding to developer reported issues and Apple QA testing input. Xcode 4.6.1 supports development with OS X 10.8.3 SDK and provides compatibility for ARC in projects targeting OS X 10.6. Xcode 4.6 adds support for development with the iOS 6.1 SDK and includes new features for the compiler and debugger. Xcode 4.5 adds support for development with iOS 6 SDK and includes additional features. Xcode 4.4 adds features to support OS X v10.8 and iOS 5.1 as well as other enhancements to the toolset.

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Xcode 4.3.3 provides an update to the included OS X SDK. Xcode 4.3.1 and 4.3.2 adds support for the updated iOS SDK 5.1. Xcode 4.3 adds features to support iOS 5.0 and OS X v10.7, as well as other enhancements to the toolset. Xcode 4.2 adds features to support iOS 5 as well as other enhancements to the application. Xcode 4.1 adds features to support OS X v10.7 Lion as well as other enhancements to the application.

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