为搜索栏设置取消按钮文本颜色(Swift)

Question

我试图在Swift中设置搜索栏旁边的取消按钮的文本颜色.这是我的代码:

func searchDisplayControllerWillBeginSearch(controller: UISearchDisplayController) {
    self.searchDisplayController?.searchBar.showsCancelButton = true
    var cancelButton: UIButton
    var topView: UIView = self.searchDisplayController?.searchBar.subviews[0] as! UIView
    for subView in topView.subviews {
        if subView.isKindOfClass(NSClassFromString("UINavigationButton")) {
            cancelButton = subView as! UIButton
            cancelButton.setTitleColor(UIColorFromRGB(0x0096FF), forState: UIControlState.Selected)
            cancelButton.setTitleColor(UIColorFromRGB(0x0096FF), forState: UIControlState.Normal)
        }
    }
}

它适用于突出显示的状态,但不适用于正常状态.我知道在Objective-C中我可以使用appearanceWhenContainedIn但在Swift中不存在.

有任何想法吗？

Answer 1

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {

    searchBar.setShowsCancelButton(true, animated: true)
    for ob: UIView in ((searchBar.subviews[0] )).subviews {

        if let z = ob as? UIButton {
            let btn: UIButton = z
            btn.setTitleColor(UIColor.blackColor(), forState: .Normal)
        }
    }
}

它是UISearchBarDelegate的委托方法:)