设置searchBar中取消按钮的属性

在UISearchBarDelegate代理方法：

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar;

设置显示取消按钮

[searchBar setShowsCancelButton:YES animated:YES];

通过遍历searchBar的所有子控件，找到UIButton的子类的哪个button进行属性设置。

示例代码

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {

    [searchBar setShowsCancelButton:YES animated:YES];
    for (UIView *searchViews in searchBar.subviews) {
        for (UIView *view in searchViews.subviews) {
            //是按钮
            if ([view isKindOfClass:[UIButton class]]) {
                UIButton *button = (UIButton *)view;
                [button setTitleColor:AB_Color_ff5400 forState:UIControlStateNormal];
                [button setTitleColor:AB_Color_ff5400 forState:UIControlStateHighlighted];
                button.titleLabel.font = AB_FONT_17;
            }
        }
    }
    
}