如何在同一个视图控制器Ios Objective-c中创建多个下拉列表？

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>

@property (nonatomic, strong) UIPickerView *pickerView1;
@property (nonatomic, strong) UIPickerView *pickerView2;
@property (nonatomic, strong) NSArray *data1;
@property (nonatomic, strong) NSArray *data2;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 初始化数据源
    self.data1 = @[@"Option1", @"Option2", @"Option3"];
    self.data2 = @[@"OptionA", @"OptionB", @"OptionC"];
    
    // 创建第一个下拉列表
    self.pickerView1 = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 200)];
    self.pickerView1.delegate = self;
    self.pickerView1.dataSource = self;
    [self.view addSubview:self.pickerView1];
    
    // 创建第二个下拉列表
    self.pickerView2 = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 400, self.view.frame.size.width, 200)];
    self.pickerView2.delegate = self;
    self.pickerView2.dataSource = self;
    [self.view addSubview:self.pickerView2];
}

#pragma mark - UIPickerViewDelegate

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1; // 设置下拉列表的列数
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    if (pickerView == self.pickerView1) {
        return self.data1.count; // 返回第一个下拉列表的选项个数
    } else if (pickerView == self.pickerView2) {
        return self.data2.count; // 返回第二个下拉列表的选项个数
    }
    return 0;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    if (pickerView == self.pickerView1) {
        return self.data1[row]; // 返回第一个下拉列表的选项显示内容
    } else if (pickerView == self.pickerView2) {
        return self.data2[row]; // 返回第二个下拉列表的选项显示内容
    }
    return @"";
}

@end