我有一个TTTableViewController子类。在loadView中，我将searchBar分配给headerView，如TTCatalog中所示：
self.tableView.tableHeaderView = _searchController.searchBar;
当我为iPhone模拟器编译时，一切正常;当我编译iOS设备编译器给我一个错误，说_searchController是未定义的。
有人可以指出我正确的方向吗？ 我已经尝试过在这里和网上找到的其他解决方案......但似乎没有解决问题...
编译器输出下方（稍长）：
CompileC /Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/Objects-normal/armv7/SearchProducts.o QShopping/Classes/SearchProducts.m normal armv7 objective-c com.apple.compilers.llvmgcc42 cd /Users/Luca/Dropbox/XcodeProjects/QShopping setenv LANG en_US.US-ASCII setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 -x objective-c -arch armv7 -fmessage-length=0 -pipe -std=gnu99 -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wunused-variable -DDEBUG -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk -gdwarf-2 -mthumb -miphoneos-version-min=4.0 -iquote /Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/QShopping-generated-files.hmap -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/QShopping-own-target-headers.hmap -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/QShopping-all-target-headers.hmap -iquote /Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/QShopping-project-headers.hmap -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Products/Debug-iphoneos/include -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Products/Debug-iphoneos/../three20 -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Products/Debug-iphoneos/../../three20 -I../three20/Build/Products/three20 -I/Users/Luca/Dropbox/XcodeProjects/QShopping/RestKit/Build -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Products/Debug-iphoneos/../../three20 -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/DerivedSources/armv7 -I/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/DerivedSources -F/Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Products/Debug-iphoneos -include /Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/PrecompiledHeaders/QShopping-Prefix-equrcyqgwoemcbaiznvexuztfkfm/QShopping-Prefix.pch -c /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m -o /Users/Luca/Library/Developer/Xcode/DerivedData/QShopping-eggzghjfaglpblfzueetmvwsljou/Build/Intermediates/QShopping.build/Debug-iphoneos/QShopping.build/Objects-normal/armv7/SearchProducts.o
/Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m: In function '-[SearchProducts loadView]': /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m:121: error: '_searchController' undeclared (first use in this function) /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m:121: error: (Each undeclared identifier is reported only once /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m:121: error: for each function it appears in.) /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m: In function '-[SearchProducts textField:didSelectObject:]': /Users/Luca/Dropbox/XcodeProjects/QShopping/QShopping/Classes/SearchProducts.m:180: error: '_searchController' undeclared (first use in this function)
答案 0 :(得分：2)
好吧，我解决了将编译器从GCC 4.2（系统默认值）更改为LVVM 2的问题。
答案 1 :(得分：1)
而不是：
self.tableView.tableHeaderView = _searchController.searchBar;
尝试：
self.tableView.tableHeaderView = self.searchDisplayController.searchBar;
这对我的项目很有帮助！
答案 2 :(得分：0)
这应该有效。您可能在某处保存了旧的三十二个标题。
/Users/Luca/Library/Developer/Xcode/DerivedData/。