我有一个小问题。现在,我想要一个可以显示标签的按钮(buttonAclicked),然后我想要其他按钮,在这种情况下,我只做了一个(btnThree),它可以输入数字,直到用户按下一个名为("ok")的按钮,这样按钮就不能在标签内输入。
现在我的问题是,当我按下"buttonAclicked"来显示标签,然后使用switch语句按下另一个按钮(btnThree)时,它会崩溃。我知道按钮(btnThree)正在工作,但我无法将其放入switch语句中。
我无法让它打印出行,所以我知道这与switch语句有关,我还尝试将"sender.tag"更改为"UIButton()"和其他一些事情。
class TriangleViewController : UIViewController {
@IBOutlet var btnThreeclicked : UIButton!
@IBOutlet var buttona : UIButton!
}
override func viewDidLoad() {
Open.target = self.revealViewController()
Open.action = Selector("revealToggle:")
let btnThree = UIButton()
btnThree.frame = CGRectMake(0.52 * view.bounds.width, 0.82 * view.bounds.height, 0.2 * view.bounds.width, 0.07 * view.bounds.height) //set frame
btnThree.setTitle("3", forState: .Normal) //set button title
btnThree.setTitleColor(UIColor.whiteColor(), forState: .Normal) //set button title color
btnThree.backgroundColor = UIColor.darkGrayColor() //set button background color
btnThree.tag = 3 // set button tag
btnThree.addTarget(self, action: "btnThreeclicked:", forControlEvents: .TouchUpInside) //add button action
self.view.addSubview(btnThree) //add button in view
let buttona = UIButton()
buttona.frame = CGRectMake(0.772 * view.bounds.width, 0.32 * view.bounds.height, 22, 22)
buttona.layer.cornerRadius = 0.04 * view.bounds.width
buttona.backgroundColor = UIColor.greenColor()
buttona.setImage(UIImage(named:"A.png"), forState: .Normal)
buttona.addTarget(self, action: "buttonAclicked:", forControlEvents: .TouchUpInside)
self.view.addSubview(buttona)
}
@IBAction func buttonAclicked(sender: UIButton)
{
print("button A was pressed")
label.hidden = false
label.setNeedsDisplay()
switch sender.tag{
case 3 :
print("buuuutttttooonnn")
break
default :
label.text = "0"
}
}
此行中的操作:
btnThree.addTarget(self, action: "btnThreeclicked:", forControlEvents: .TouchUpInside) //add button action
必须与您想要调用的方法的名称相匹配——大概就是这个函数:
@IBAction func buttonAclicked(sender: UIButton)
因此将行修改为:
btnThree.addTarget(self, action: "buttonAclicked:", forControlEvents: .TouchUpInside) //add button action