[英]how highlight bar button item? (Swift)
我使用工具栏项来使用动作属性,我想在点击其中的一项时,将图像更改为突出显示的图像。
这是我所有的三个按钮:
@IBAction func audio(sender: AnyObject) {
self.scView.contentOffset = CGPointMake(0,0);
}
@IBAction func mainBtn(sender: AnyObject) {
self.scView.contentOffset = CGPointMake(415,0);
}
@IBAction func videoBtn(sender: AnyObject) {
self.scView.contentOffset = CGPointMake(830,0);
}
@IBOutlet var inpt: UITextField!
@IBOutlet var scView: UIScrollView!
这是我的应用图片: image
谢谢
如果您只想在按下按钮的同时显示带有突出显示图像的按钮-您可以通过情节提要来做到这一点-您可以将每个按钮的图像设置为default
状态,也可以highlighted
-但是在释放按钮时按钮,它会返回到原始图像。
如果要在选择按钮时切换图像,则必须为按钮添加插座,并添加按钮状态变量(如果它仅更改一次,并且从不退回到原始状态,那么您无需需要状态)
这是您可能的操作方式示例-已更新以重置“其他”按钮
@IBOutlet weak var mainButton: UIButton!
@IBOutlet weak var videoButton: UIButton!
var mainButtonSelected : Bool = false
var videoButtonSelected : Bool = false
@IBAction func mainButton(sender: AnyObject)
{
mainButtonSelected = !mainButtonSelected // toggle state
if mainButtonSelected
{
// highlight the mainButton
mainButton.setImage(UIImage(named: "imageMainHighlight.png"), forState: .Normal)
// clear the highlight (if any) on videoButton
videoButton.setImage(UIImage(named: "imageVideoDefault.png"), forState: .Normal)
// UPDATED
// make sure the videoButtonSelected flag is correct
videoButtonSelected = false
// UPDATED
}
else
{
// clear the highlight on mainButton, no need to do anything with videoButton
mainButton.setImage(UIImage(named: "imageMainDefault.png"), forState: .Normal)
}
// add any other code you need here
}
@IBAction func videoButton(sender: AnyObject)
{
videoButtonSelected = !videoButtonSelected // toggle state
if videoButtonSelected
{
// highlight videoButton
videoButton.setImage(UIImage(named: "imageVideoHighlight.png"), forState: .Normal)
// clear the highlight (if any) on mainButton
mainButton.setImage(UIImage(named: "imageMainDefault.png"), forState: .Normal)
// UPDATED
// make sure the mainButtonSelected flag is correct
mainButtonSelected = false
// UPDATED
}
else
{
// clear the highlight on videoButton, no need to do anything for mainButton
videoButton.setImage(UIImage(named: "imageVideoDefault.png"), forState: .Normal)
}
// add any other code you need here
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.