问题描述
学习 swift 已经完成了一部分，但我又遇到了一个小问题，我确信我在这方面有点新，并且有一个简单的解决方案，但我无法弄清楚如何选择/下面的取消选择按钮是我到目前为止所拥有的，它是一个按钮在点击时变成复选标记......我已经做到了那么远，但我需要在再次点击时取消选择该按钮，然后显然能够再次点击如果需要的话.
Part way done with learning swift but I hit a small wall and yet again, I'm sure I'm just a bit new at this and an easy solution is there but I'm having trouble figuring out how to select/deselect buttons below is what I have so far and it is a button turns into a checkmark when clicked on... I've gotten that far but I need that button to deselect when clicked on again and then obviously be able to be clicked again if need be.
@IBAction func buttonPressed(sender: AnyObject) {
sender.setImage(UIImage(named: "Checkmark.png"), forState: .Normal)
}
推荐答案
Swift 3 注意:.selected 和 .checked 现在是小写 UIControlState 值，部分方法已重命名:
Swift 3 note: .selected and .checked are now lower case UIControlState values in the SDK, and some of the methods have been renamed:
let button = UIButton()
button.setImage(UIImage(named: "Unchecked"), for: .normal)
button.setImage(UIImage(named: "Checked"), for: .selected)
您现在还可以在 Xcode 8 中使用图像文字而不是 UIImage(named:):
You can also now use image literals with Xcode 8 instead of UIImage(named:):
#imageLiteral(resourceName: "Unchecked")
斯威夫特 2:
为什么不用按钮的.Selected状态作为选中"状态，.Normal状态作为未选中"状态.
Why not use the .Selected state of the button as the "checked" state, and the .Normal state as the "unchecked" state.
let button = UIButton()
button.setImage(UIImage(named: "Unchecked"), forState: .Normal)
button.setImage(UIImage(named: "Checked"), forState: .Selected)
// ...
@IBAction func buttonPressed(sender: AnyObject) {
if let button = sender as? UIButton {
if button.selected {
// set deselected
button.selected = false
} else {
// set selected
button.selected = true
}
}
}
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