【发布时间】：2016-01-27 08:23:45
【问题描述】：
我是 iOS 开发的新手，并且一直在学习一些在线课程。在其中一个中，我们开发了一个测验应用程序，我想通过改进该应用程序来提高我的技能，使其超出课程所涵盖的范围。
该应用使用 .json 文件作为问题和答案的“数据库”。这个 .json 文件如下所示...
{
"id" : "1",
"question": "Earth is a:",
"answers": [
"Planet",
"Meteor",
"Star",
"Asteroid"
],
"difficulty": "1"
}
...继续回答 500 多个问题。
目前，该应用会向用户提出一个包含四个可能答案的问题。在 .json 文件中，第一个答案始终是正确答案，但应用程序被编码为随机播放答案，因此正确答案并不总是排在第一位。
该应用程序还进行了编码，以便显示答案的四个按钮（我为按钮使用四种不同颜色的图像）被禁用，并且在用户做出选择后外观也会变暗，除了他们选择的按钮没有变暗以便他们的选择被突出显示。
我想做的是更改此设置，以突出显示正确答案的按钮，以通知用户正确答案是什么。
我正在使用以下代码来加载问题和答案并随机播放答案：
func loadAllQuestionsAndAnswers()
{
let path = NSBundle.mainBundle().pathForResource("content", ofType: "json")
let jsonData : NSData = NSData(contentsOfFile: path!)!
allEntries = (try! NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers)) as! NSArray
//println(allEntries)
}
func loadQuestion(index : Int)
{
let entry : NSDictionary = allEntries.objectAtIndex(index) as! NSDictionary
let question : NSString = entry.objectForKey("question") as! NSString
let arr : NSMutableArray = entry.objectForKey("answers") as! NSMutableArray
//println(question)
//println(arr)
labelQuestion.text = question as String
let indices : [Int] = [0,1,2,3]
//let newSequence = shuffle(indices)
let newSequence = indices.shuffle()
var i : Int = 0
for(i = 0; i < newSequence.count; i++)
{
let index = newSequence[i]
if(index == 0)
{
// we need to store the correct answer index
currentCorrectAnswerIndex = i
}
let answer = arr.objectAtIndex(index) as! NSString
switch(i)
{
case 0:
buttonA.setTitle(answer as String, forState: UIControlState.Normal)
break;
case 1:
buttonB.setTitle(answer as String, forState: UIControlState.Normal)
break;
case 2:
buttonC.setTitle(answer as String, forState: UIControlState.Normal)
break;
case 3:
buttonD.setTitle(answer as String, forState: UIControlState.Normal)
break;
default:
break;
}
目前我正在使用此代码检查答案：
var currentCorrectAnswerIndex : Int = 0
func checkAnswer( answerNumber : Int)
{
if(answerNumber == currentCorrectAnswerIndex)
{
// we have the correct answer
labelFeedback.text = "Correct! +1"
labelFeedback.textColor = UIColor.greenColor()
score = score + 1
labelScore.text = "score: \(score)"
SaveScore()
// later we want to play a "correct" sound effect
PlaySoundCorrect()
}
else
{
// we have the wrong answer
labelFeedback.text = "Wrong answer"
labelFeedback.textColor = UIColor.redColor()
// we want to play a "incorrect" sound effect
PlaySoundWrong()
}
在突出显示按钮方面，我将使用编码，例如：
func resetAnswerButtons()
{
buttonA.alpha = 1.0
buttonB.alpha = 1.0
buttonC.alpha = 1.0
buttonD.alpha = 1.0
buttonA.enabled = true
buttonB.enabled = true
buttonC.enabled = true
buttonD.enabled = true
}
@IBAction func PressedButtonA(sender: UIButton) {
print("button A pressed")
buttonB.alpha = 0.3
buttonC.alpha = 0.3
buttonD.alpha = 0.3
buttonA.enabled = false
buttonB.enabled = false
buttonC.enabled = false
buttonD.enabled = false
CheckAnswer(0)
}
@IBAction func PressedButtonB(sender: UIButton) {
print("button B pressed")
buttonA.alpha = 0.3
buttonC.alpha = 0.3
buttonD.alpha = 0.3
buttonA.enabled = false
buttonB.enabled = false
buttonC.enabled = false
buttonD.enabled = false
CheckAnswer(1)
}
@IBAction func PressedButtonC(sender: UIButton) {
print("button C pressed")
buttonA.alpha = 0.3
buttonB.alpha = 0.3
buttonD.alpha = 0.3
buttonA.enabled = false
buttonB.enabled = false
buttonC.enabled = false
buttonD.enabled = false
CheckAnswer(2)
}
@IBAction func PressedButtonD(sender: UIButton) {
print("button D pressed")
buttonA.alpha = 0.3
buttonB.alpha = 0.3
buttonC.alpha = 0.3
buttonA.enabled = false
buttonB.enabled = false
buttonC.enabled = false
buttonD.enabled = false
CheckAnswer(3)
}
我无法理解的是如何编写应用程序代码以突出显示正确答案？目前，上面的代码通过调暗“其他”按钮的 alpha 来有效地突出显示按下的按钮。如何让应用程序识别哪个“随机播放”按钮包含正确答案并突出显示那个？
【问题讨论】：
-
OP，请停止滥用 xcode 标签。根据经验，在添加标签之前，请先将鼠标悬停在上面。
-
糟糕！感谢您的提示。