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我遇到了與iCloud相關的iPod Touch ios v4.3.1崩潰。iCloud的iCloud通知崩潰<5
崩潰日誌：
Date/Time: 2012-06-12 11:42:43.557 -0700
OS Version: iPhone OS 4.3.1 (8G4)
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x00000001, 0xe7ffdefe
Crashed Thread: 0
Dyld Error Message:
Symbol not found: _NSUbiquitousKeyValueStoreDidChangeExternallyNotification
Referenced from: /var/mobile/Applications/997BA11D-FD1E-4755-860C-2A708D5E39EF/AppName.app/AppName
Expected in: /System/Library/Frameworks/Foundation.framework/Foundation
in /var/mobile/Applications/997BA11D-FD1E-4755-860C-2A708D5E39EF/AppName.app/AppName
Dyld Version: 191.3
但代碼不應該被註冊爲任何的iCloud服務。我有以下代碼到位，我已經通過它加強確保此設備上，它從來沒有註冊觀測iCloud的通知：
if(NSClassFromString(@"NSUbiquitousKeyValueStore")) { // is iOS 5?
if([NSUbiquitousKeyValueStore defaultStore]) { // is iCloud enabled
[self addObservers];
}
}
謝謝！