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-(void)encodeRestorableStateWithCoder:(NSCoder *)coder
{
[super encodeRestorableStateWithCoder: coder];
[coder encodeObject:self.txtField.text forKey:@"kSaveKey"];
}
-(void)decodeRestorableStateWithCoder:(NSCoder *)coder
{
[super encodeRestorableStateWithCoder:coder];
//self.txtField.text = [coder decodeObjectForKey:kSaveKey];
self.txtField.text = [coder decodeObjectForKey:@"kSaveKey"];
}