What's New in Version 4.2.1 This update addresses a number of stability issues, including the following: - Fixes an issue where the "Convert to Objective-C ARC" operation would not complete. - Resolves a problem that resulted in no visible developer profiles in the Organizer. - Corrects an erroneous locked file dialog appearing in the documentation window. Features and enhancements in previous Xcode updates: - Xcode 4.2 includes SDKs for Mac OS X 10.7 Lion and iOS 5. - Storyboards let you design multiple iOS screens, and define the segues among them. - Automatic Reference Counting (ARC) saves you from manually managing retain/release. - iCloud entitlements are automatically enabled for Mac and iOS apps. - OpenGL ES Debugger graphically analyzes your OpenGL scene directly within the IDE. - Apple LLVM compiler supports C++11 features and the LLVM libc++ standard library. - Older iOS Simulators and device debugging symbols are downloaded on-demand. - Interface Builder support for Auto Layout and new Aqua controls such as NSPopover. - Project editor can validate and resolve out of date build settings. http://itunes.apple.com/us/app/id448457090?mt=12&ign-mpt=uo%3D4 不知道SVN连线的问题有没有解决。... 等会载完再来试试看。@@" --

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