我想建立与嵌套数据和2个组成一个UIPicker。 (选择水果当例如 - >显示香蕉,苹果...;当选择蔬菜 - >显示的西红柿...)的第二组分应该是依赖于第一组件的选择。
这工作,但第二个部件的UI不是直接更新。我必须挖掘第二个部件上看到标题。我尝试更新的选择后的组件(picker.reloadComponent(1)
)也AllComponents picker.reloadAllComponents()
。
有任何想法吗?
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var picker: UIPickerView!
var plants = [Dictionary<String, Any>]()
var groups:[String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
plants.append([
"name": "Fruits",
"groups": [
"Banana",
"Apple"
]
])
plants.append([
"name": "Veggies",
"groups": [
"Tomatoe",
"Salad",
"Cucumber"
]
])
if plants[0]["groups"] != nil {
groups = plants[0]["groups"] as! Array
}
picker.delegate = self
picker.dataSource = self
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
return plants.count
} else if component == 1 {
return groups.count
}
return 0
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 0 {
// Update groups array, based on selection
if plants[row]["groups"] != nil {
groups = plants[row]["groups"] as! Array
}
picker.reloadComponent(1) //also tried picker.reloadAllComponents() here
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 {
if plants[row]["name"] != nil {
return plants[row]["name"] as! String
}
} else if component == 1 {
// return values of current group
return groups[row]
}
return ""
}
}
提前致谢!
迅速4.2 / 10的Xcode
你的代码工作正常。如果你的问题是,你希望第二个组件重新加载到它的第一个项目,试试这个picker.reloadComponent(1)
后:
picker.selectRow(0, inComponent: 1, animated: true)
否则,请具体谈谈这个问题。