解决方法
幸运的是,我刚刚正在研究正是这样做的代码.这有点像黑客,但你可以找到嵌入在UISearchBar中的UITextField,然后自动关闭enableReturnKey：
UITextField *searchBarTextField = nil;
for (UIView *subview in searchBar.subviews)
{
if ([subview isKindOfClass:[UITextField class]])
{
searchBarTextField = (UITextField *)subview;
break;
}
}
searchBarTextField.enablesReturnKeyAutomatically = NO;
