如何在两个ViewController间传递UIPickerView等控件的选中值

你已经掌握了文本框的Segue传值逻辑，其实UIPickerView、分段控件（UISegmentedControl）和步进器（UIStepper）的传值思路完全一致——在prepare(for:sender:)方法里获取当前控件的选中/当前值，再赋值给目标ViewController的对应属性。

前提准备 #

确保你已经给这三个控件添加了IBOutlet关联（比如命名为myPickerView、mySegmentControl、myStepper），同时在ViewController2里定义好接收值的属性，比如：

// ViewController2.swift
var pickerSelectedText: String?
var segmentSelectedIndex: Int?
var segmentSelectedTitle: String?
var stepperCurrentValue: Double?

1. UIPickerView 传值 #

UIPickerView需要先获取选中的行索引，再从你的数据源数组里取出对应内容：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let viewController2 = segue.destination as? ViewController2 {
        // 假设你的UIPickerView数据源是这个数组
        let pickerOptions = ["苹果", "香蕉", "橙子", "葡萄"]
        // 获取选中的行（component:0 指第一个滚轮，多滚轮的话按需修改）
        let selectedRow = myPickerView.selectedRow(inComponent: 0)
        // 取出对应内容并传值
        viewController2.pickerSelectedText = pickerOptions[selectedRow]
    }
}

2. 分段控件（UISegmentedControl）传值 #

分段控件可以直接获取选中的索引或标题：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let viewController2 = segue.destination as? ViewController2 {
        // 获取选中的索引
        let selectedIndex = mySegmentControl.selectedSegmentIndex
        viewController2.segmentSelectedIndex = selectedIndex
        
        // 或者获取选中的标题（注意判断索引是否有效）
        if selectedIndex != UISegmentedControl.noSegment {
            viewController2.segmentSelectedTitle = mySegmentControl.titleForSegment(at: selectedIndex)
        }
    }
}

3. 步进器（UIStepper）传值 #

步进器直接读取value属性即可（默认是Double类型）：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let viewController2 = segue.destination as? ViewController2 {
        viewController2.stepperCurrentValue = myStepper.value
    }
}

整合多个控件的传值 #

如果需要同时传递多个控件的值，直接把逻辑合并到同一个prepare方法里就行：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let viewController2 = segue.destination as? ViewController2 else { return }
    
    // UIPickerView传值
    let pickerOptions = ["苹果", "香蕉", "橙子", "葡萄"]
    let selectedPickerRow = myPickerView.selectedRow(inComponent: 0)
    viewController2.pickerSelectedText = pickerOptions[selectedPickerRow]
    
    // 分段控件传值
    let selectedSegmentIndex = mySegmentControl.selectedSegmentIndex
    viewController2.segmentSelectedIndex = selectedSegmentIndex
    if selectedSegmentIndex != UISegmentedControl.noSegment {
        viewController2.segmentSelectedTitle = mySegmentControl.titleForSegment(at: selectedSegmentIndex)
    }
    
    // 步进器传值
    viewController2.stepperCurrentValue = myStepper.value
}

内容的提问来源于stack exchange，提问作者nothing