这里我主要是以我做过的来举例说明:
QuestionnaireViewController是开始答问卷页,QuestionnaireOptionViewController是问卷答题目页.
首先,在答题目页,添加常量:
static let TAG = "QuestionnaireOptionViewController"
static let TAG_BREAK = "QuestionnaireOptionViewControllerBreak"
重写
override func didMoveToParentViewController(parent: UIViewController?){
if isfinishQuestion {
NSNotificationCenter.defaultCenter().postNotificationName(QuestionnaireOptionViewController.TAG, object: nil)
} else {
NSNotificationCenter.defaultCenter().postNotificationName(QuestionnaireOptionViewController.TAG_BREAK, object: nil)
}
}
再在开始答问卷页,这个方法里,添加:
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(updateView), name: QuestionnaireOptionViewController.TAG, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(updateViewBreak), name: QuestionnaireOptionViewController.TAG_BREAK, object: nil)
}
func updateView() {
beginResponse.setTitle("已完成答题", forState: UIControlState.Normal)
beginResponse.enabled = false
beginResponse.backgroundColor = UIColor(red: 216/255, green: 216/255, blue: 216/255, alpha: 1)
}
func updateViewBreak() {
beginResponse.setTitle("继续答题", forState: UIControlState.Normal)
beginResponse.backgroundColor = UIColor(red: 233/255, green: 30/255, blue: 99/255, alpha: 1)
}
注意,在此页面还要写deinit,销毁监听:
deinit {
NSNotificationCenter.defaultCenter().removeObserver(self)
}
这样,当答题目页操作有什么变化,返回上一页面就可以知道其变化.
