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可能重复：
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?Xcode的构建成功，但在iPhone上无法运行
我有我真的不明白的问题，我用我的Xcode直到昨天，所有工作完美，但昨天我安装iOS 5的Xcode 4.2，但现在当我试图做一个与我的iPhone集运行目标是成功构建应用程序，然后立即停止。没有错误，控制台日志中没有任何错误。该应用程序甚至不会复制到我的设备。 Xcode说：建设，运行，完成运行....所有在2秒内...... 在模拟器上的所有作品，但在设备上没有任何事情发生。
我有xcode 4.2与iOS 5，我有一个iPhone 3G与io 4.2.1和部署目标我选择4.2像最后一天。请帮我我疯了！
我看到的Xcode的组织者窗口上，该日志给我这个结果，我复制一小部分：
Sat Oct 15 18:17:14 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:14 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:14 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:14 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:15 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:15 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:16 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:16 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:16 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:16 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:17 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:17 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:17 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:17 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:18 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing connection
Sat Oct 15 18:17:18 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:18 unknown com.apple.mobile.lockdown[18] <Notice>: Could not receive size of message
Sat Oct 15 18:17:18 unknown lockdownd[18] <Error>: 2ff68000 handle_connection: Could not receive USB message #6 from Xcode. Killing
问题是什么？
P.S.我试图把这个架构放在armv6上，并且在这个设备上构建是这个问题？但是它是如何改变的......我从来没有改变过Xcode上的架构。
mmorris在回答这个问题时表现得非常好。 http://stackoverflow.com/questions/7760946/possible-to-target-older-ios-versions-when-using-xcode-4-2-and-ios-5-sdk –
良好的链接，它帮助了我。 – justinkoh
我尝试过所有步骤，但对我无用。但最终我自己找到了解决方案：在我的情况下，它像魔术一样工作：转到产品>编辑方案>选择使用信息选项卡运行并取消选中调试可执行文件。魔术开始了！再次运行项目。我希望它也适用于你的情况。谢谢所有... –