我有 3 个按钮,提供给用户选择他们希望查看的类别。
它们的定义如下:
//outlets
@IBOutlet weak var ChineseButton: UIButton!
@IBOutlet weak var IndianButton: UIButton!
@IBOutlet weak var MexicanButton: UIButton!
我对这些按钮执行以下操作(将原始图像按钮更改为灰色版本):
// Action
@IBAction func ChineseButtonPressed(sender: UIButton)
{
ChineseButton.setImage(UIImage(named: "chinese.png"), forState: UIControlState.Normal)
ChineseButton.setImage(UIImage(named: "chinese.png"), forState: UIControlState.Selected)
IndianButton.setImage(UIImage(named: "grey-indian.png"), forState: UIControlState.Normal)
MexicanButton.setImage(UIImage(named: "grey-mexican.png"), forState: UIControlState.Normal)
}
@IBAction func EightFacedButtonPressed(sender: UIButton) {
IndianButton.setImage(UIImage(named: "indian.png"), forState: UIControlState.Normal)
IndianButton.setImage(UIImage(named: "indian.png"), forState: UIControlState.Selected)
ChineseButton.setImage(UIImage(named: "grey-chinese.png"), forState: UIControlState.Normal)
MexicanButton.setImage(UIImage(named: "grey-mexican.png"), forState: UIControlState.Normal)
}
@IBAction func TweleveFacedButtonPressed(sender: UIButton) {
MexicanButton.setImage(UIImage(named: "mexican.png"), forState: UIControlState.Normal)
MexicanButton.setImage(UIImage(named: "mexican.png"), forState: UIControlState.Selected)
ChineseButton.setImage(UIImage(named: "grey-chinese.png"), forState: UIControlState.Normal)
IndianButton.setImage(UIImage(named: "grey-indian.png"), forState: UIControlState.Normal)
}
此操作函数还确定 UIControlState,我有另一个按钮,单击该按钮后会将您带到另一个页面,但需要了解选择了哪个按钮。
我尝试了以下操作,但它似乎无法识别选择了哪个按钮?
@IBAction func GenerateButton(sender: UIButton) {
if ChineseButton.selected == true{
println("Chinese button was selected")
}
我是 swift 新手,因此我们将不胜感激!
谢谢:)
最佳答案
您没有选择按钮,您只是更改图像。
首先,您可以简化所有代码并设置一次图像,灰色表示正常,彩色表示选定状态:
override func viewDidLoad() {
super.viewDidLoad()
MexicanButton.setImage(UIImage(named: "mexican.png"), forState: UIControlState.Normal)
MexicanButton.setImage(UIImage(named: "grey-mexican.png"), forState: UIControlState.Selected)
ChineseButton.setImage(UIImage(named: "grey-chinese.png"), forState: UIControlState.Normal)
ChineseButton.setImage(UIImage(named: "chinese.png"), forState: UIControlState.Selected)
IndianButton.setImage(UIImage(named: "grey-indian.png"), forState: UIControlState.Normal)
IndianButton.setImage(UIImage(named: "indian.png"), forState: UIControlState.Selected)
}
您也可以在 Storyboard 上进行配置,在图标的不同 State Configs
处更改 Image
:
然后,在每个操作中,您只需选择按钮,就会显示正确的图像(您可以对所有按钮使用相同的操作):
@IBAction func AnyButtonPressed(sender: UIButton) {
// Deselect all buttons but the pressed one
for button in [ChineseButton, IndianButton, MexicanButton] {
button.selected = sender === button
}
}
关于Swift UIControlState.Selected 保持选中状态吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33570981/