我正在尝试制作一个水平 UIPickerView。但我对宽度有一些问题。正如您可以在上图顶部看到的
我希望 PickerView 的宽度 = view.frame.size.width,但由于某种原因它保持非常小。在我的代码中我有:
let cityPicker = UIPickerView()
var rotationAngle: CGFloat!
let width:CGFloat = 100
let height:CGFloat = 100
override func viewDidLoad() {
super.viewDidLoad()
cityPicker.delegate = self
cityPicker.dataSource = self
cityPicker.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 50)
self.view.addSubview(cityPicker)
rotationAngle = -90 * (.pi/180)
cityPicker.transform = CGAffineTransform(rotationAngle: rotationAngle)
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return byer.count
}
func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
return 100
}
func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
return 100
}
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
let view = UIView()
view.frame = CGRect(x: 0, y: 0, width: width, height: height)
let label = UILabel()
label.frame = CGRect(x: 0, y: 0, width: width, height: height)
label.textAlignment = .center
label.font = UIFont (name: "Baskerville-Bold", size: 30)
label.text = byer[row]
view.addSubview(label)
view.transform = CGAffineTransform(rotationAngle: 90 * (.pi/180))
return view
}
有人能看出我做错了什么吗?
最佳答案
您应该只使用自动布局,但如果您想要手动布局,则不能在 viewDidLoad
中使用 View 框架。此时,框架将等于 Storyboard 或 nib 文件中的内容,并且不会反射(reflect)实际的设备或 View 层次结构。您应该将手动调整大小逻辑放在 viewDidLayoutSubviews 中。当调用此函数时,您的 View 具有正确的大小,您可以使用它来设置 subview 。
关于swift - 制作水平UIPickerView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49334165/