我有一个NSString *url = [[NSBundle mainBundle] pathForResource:@"image" ofType:@"png"];
NSString *cssString = [NSString stringWithFormat:@".textBox{ background-image:url(%@); background-position: right top; background-repeat: no-repeat; background-size: contain; }",url]; // 1
我正在进行子类化，效果很好。但是，我有一个方法需要调用＆＃34; reset＆＃34;来自UIViewController的UIPicker，正在查看它。但是，它永远不会发射。如何从其他视图控制器调用UIPickerView？
func resetPicker()编辑：
以下在调用import Foundation
import UIKit
class ScoreClockPicker: UIPickerView {
//PickerView
let timerMinutesArray = Array(00...20)
let timerSecondsArray = Array(00...59)
let periodArray = ["1st", "2nd", "3rd", "OT", "SO"]
//Picker return values
var numberOfRowsInComponentReturnValue = 0
var titleForRowReturnValue = ""
var widthForComponentReturnValue = ""
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.delegate = self
self.dataSource = self
}
func resetPicker() {
print("resetPicker")
self.selectRow(0, inComponent: 0, animated: true)
self.selectRow(0, inComponent: 1, animated: true)
self.selectRow(0, inComponent: 3, animated: true)
}
}
extension ScoreClockPicker: UIPickerViewDataSource {
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
numberOfRowsInComponentReturnValue = periodArray.count
} else if component == 1 {
numberOfRowsInComponentReturnValue = timerMinutesArray.count
} else if component == 2 {
numberOfRowsInComponentReturnValue = 1
} else if component == 3 {
numberOfRowsInComponentReturnValue = timerSecondsArray.count
}
return numberOfRowsInComponentReturnValue
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 4
}
func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
var componentWidth = 0
if component == 0 {
componentWidth = 140
} else if component == 1 {
componentWidth = 40
} else if component == 2 {
componentWidth = 30
} else if component == 3 {
componentWidth = 40
}
return CGFloat(componentWidth)
}
}
extension ScoreClockPicker: UIPickerViewDelegate {
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("didSelectRow")
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 {
titleForRowReturnValue = periodArray[row]
} else if component == 1 {
titleForRowReturnValue = String(describing: timerMinutesArray[row])
} else if component == 2 {
titleForRowReturnValue = ":"
} else if component == 3 {
titleForRowReturnValue = String(format: "%02d",timerSecondsArray[row])
}
return titleForRowReturnValue
}
}
的viewController中无效：
ScoreClockPicker答案 0 :(得分：1)
从您的代码中，您尚未初始化您尝试在按钮操作中使用的picker对象。因此，在使用它之前，只需初始化picker。
如果您正在制作ScoreClockPicker的出口
@IBOutlet var picker: ScoreClockPicker!
或者您可以在picker
viewDidLoad
self.picker = ScoreClockPicker()