ios 选择/取消选择按钮 swift xcode 7
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Select/deselect buttons swift xcode 7
提问by yrpalnoob
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.
学习 swift 的部分方法已经完成，但我又碰到了一个小墙，我确定我对此有点陌生，有一个简单的解决方案，但我无法弄清楚如何选择/取消选择下面的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一个复选标记......我已经走了那么远，但我需要在再次点击时取消选择该按钮，然后显然可以在需要时再次点击.
@IBAction func buttonPressed(sender: AnyObject) {
sender.setImage(UIImage(named: "Checkmark.png"), forState: .Normal)
}
回答by JAL
Swift 3 note: .selectedand .checkedare now lower case UIControlStatevalues in the SDK, and some of the methods have been renamed:
斯威夫特3注：.selected和.checked现在是小写UIControlState的SDK值，以及一些方法已经改名：
let button = UIButton()
button.setImage(UIImage(named: "Unchecked"), for: .normal)
button.setImage(UIImage(named: "Checked"), for: .selected)
You can also now use image literals with Xcode 8 instead of UIImage(named:):
您现在还可以在 Xcode 8 中使用图像文字，而不是UIImage(named:)：
#imageLiteral(resourceName: "Unchecked")
Swift 2:
斯威夫特 2：
Why not use the .Selectedstate of the button as the "checked" state, and the .Normalstate as the "unchecked" state.
为什么不使用.Selected按钮的状态作为“选中”状态，将.Normal状态作为“未选中”状态。
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
}
}
}
回答by Nitin Gohel
You dont need to set selected in condition. I just doing with following method in swift:
您不需要在条件中设置 selected 。我只是在 swift 中使用以下方法：
func selectDeselect(sender: UIButton){
sender.selected = !sender.selected
if(sender.selected == true)
{
sender.setImage(UIImage(named:"select_heart"), forState: UIControlState.Normal)
}
else
{
sender.setImage(UIImage(named:"heart"), forState: UIControlState.Normal)
}
}
回答by Nikunj Kumbhani
Here is Working code for swift 4.
这是 swift 4 的工作代码。
Make Sure you need to connect Button IBActionOutlet as UIButtonand set default button image from storyboard whatever you want.
确保您需要将按钮IBAction插座连接为UIButton并从故事板中设置您想要的默认按钮图像。
@IBAction func btnTapped(_ sender: UIButton) {
if sender.currentImage == UIImage(named: "radio_unchecked"){
sender.setImage(UIImage(named: "radio_checked"), for: .normal)
}else{
sender.setImage(UIImage(named: "radio_unchecked"), for: .normal)
}
}
回答by Archana SIngh
Set uncheck image on default state from storyboard and check image on selected state from storyboard.
从情节提要中取消选中默认状态下的图像，并从情节提要中选中选中状态上的图像。
@IBAction func buttonPressed(sender: AnyObject) {
buttonOutlet.isSelected = !buttonOutlet.isSelected
}
