我在我的项目中使用了一些cocapods(DKCircleButton = OBJ-c中制造的UIButton),并且我试图添加约束并使用户点击后我的按钮移至底部。 我尝试了所有可能的解决方案,但没有一个起作用。
这是我的代码。
override func viewDidLoad() {
super.viewDidLoad()
let button = DKCircleButton(frame: CGRect(x: 0, y: 0, width: 150, height: 150))
button.center = CGPoint(x: 160, y: 200)
button.setTitle("Отмазаться", for: .normal)
button.titleLabel?.font = UIFont.systemFont(ofSize: 20)
button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)
button.animateTap = true
button.backgroundColor = UIColor(red: 230/255, green: 103/255, blue: 103/255, alpha: 1.0)
self.view.addSubview(button)
let xPosition:CGFloat = 110
let yPosition:CGFloat = 200
let buttonWidth:CGFloat = 150
let buttonHeight:CGFloat = 150
button.frame = CGRect(x:xPosition, y:yPosition, width:buttonWidth, height:buttonHeight)
}
@objc func buttonPressed(sender: DKCircleButton) {
// here's should be action associated with a tap, but it doesn't work at all
// for example, I've tried to change the title of the bottom but this function doesn't recognise the "bottom" identifier
print("got it")
}
答案 0 :(得分:1)
主要问题实际上是一个非常普遍的问题:您尝试在定义变量的范围之外访问变量。您的let button
是在viewDidLoad()
内部定义的,因此只能从viewDidLoad()
内部访问。为了能够更改其他函数中的内容,您可以进行更全局的引用,然后将其加载到viewDidLoad()
中,如下所示:
var button : DKCircleButton!
override func viewDidLoad() {
super.viewDidLoad()
button = DKCircleButton(frame: CGRect(x: 0, y: 0, width: 150, height: 150))
button.center = CGPoint(x: 160, y: 200)
button.setTitle("Отмазаться", for: .normal)
....//no more changes here
}
@objc func buttonPressed(sender: DKCircleButton) {
var newFrame = button.frame
newFrame.width = 200 // You can change whatever property you want of course, this is just to give an example.
button.frame = newFrame
print("got it")
}
确保button变量在同一类内,但在任何其他函数之外。