searchBar失去焦点,键盘不消失

1）searchBar动态显示/隐藏按钮 Cancel按钮

barBtn.showsCancelButton = YES;//显示

barBtn.showsCancelButton = NO;//隐藏

2）输入内容点击搜索后，searchBar失去焦点，键盘不消失且Cancel按钮的颜色变成了灰色（连续两次点击搜索键盘才消失 但是Cancel按钮的颜色还是灰色）

解决方法：searchBarSearchButtonClicked内设置

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

[searchBar resignFirstResponder]; //searchBar失去焦点

    UIButton *cancelBtn = [searchBar valueForKey:@"cancelButton"]; //首先取出cancelBtn

    cancelBtn.enabled = YES; //把enabled设置为yes

}