修改UISearchDisplayController 的Search Bar上“Cancel”按钮的文字

- (void) searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller
{
[searchBar setShowsCancelButton:YES];
for (UIView *v in searchBar.subviews) {
if ([v isKindOfClass:[UIButton class]]) {
[(UIButton *)v setTitle:@"返回" forState:UIControlStateNormal];
}
}
}