ios - iOS获取要在UIButton中设置的默认UISearchBar图标

Question

我试图获取要在另一个UIButton中设置的默认UISearchBar图标(放大镜)。

PS:我不想使用从默认位置下载的png。

func添加带有自定义图像的按钮只是为了显示一些示例:

func addRightNavigationButton(){
    let buttonBack: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
    buttonBack.frame = CGRectMake(0, 0, 30, 33)
    buttonBack.setImage(UIImage(named:"search.png"), forState: UIControlState.Normal)
    buttonBack.addTarget(self, action: "barButtonItemClicked:", forControlEvents: UIControlEvents.TouchUpInside)
    var rightBarButtonItem: UIBarButtonItem = UIBarButtonItem(customView: buttonBack)
    self.navigationItem.setRightBarButtonItem(rightBarButtonItem, animated: false)
}

Answer 1

在Objective-C中:

UIBarButtonItem *searchItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(searchButtonItemClicked:)];
[self.navigationItem setRightBarButtonItem:searchItem animated:FALSE];

在Swift 1.2中:

let searchItem : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Search, target: self, action: "searchButtonItemClicked:")
self.navigationItem.rightBarButtonItem = searchItem;