Xcode4 attaching to appname问题解决方法

1- restart xcode and/or restart simulator (reset content and settings) and/or restart computer.

2- click on project name in project navigator. in build settings tab, go to packaging and make sure that "Product Name" is the same that the one xcode says simulator is attaching to when running. if they are different, it will fail.

3- go to your projectname.xcodeproj folder. inside there delete anything named with your userid. when you reopen xcode those files will be recreated and it should work…

4- Manually delete the build directory for your project.

5- Go to organizer window. select Projects, select your app in the left hand side and then delete over "Derived Data"

6- Check Launch option is set to "Automatically" in Product->Edit Scheme, "Run" scheme.

7- In Project->"Edit Schemes"->Run. Change the Debugger from GDB to None (this doesn't make sense to me..).

8- Kill the process gdb-i386-apple-darwin from Activity Monitor. this is assuming gdb is not responding.

9- In "Product"->Edit Scheme. in Run, click yourappname.app, choose other, navigate to your .app in your project. now run.

10- Check that you don't have two different Info.plist in your project. if you do, remove the bad one.

11- seems like there seem to be a lot of things causing this, but one thing that worked for me was simply cleaning out the build folder by pressing Cmd+Option+Shift+K or alternately if you select the Product dropdown in the toolbar and hold the Option button you should see the "Clean Build Folder" option appear

12.换证书