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@implementation ViewController
 
- (void)viewDidLoad
{
    [super viewDidLoad];
 
    // 设置背景色为魄
    self.view.backgroundColor = [UIColor whiteColor];
 
    // 创建一个选择器
    UIPickerView *picker = [[UIPickerView alloc] init];
    picker.delegate = self;                 // 代理
    picker.dataSource = self;               // 数据源
    picker.showsSelectionIndicator = YES;   // 选择行高亮
    [self.view addSubview:picker];          // 添加到视图
}
 
#pragma mark - 数据源方法
#pragma mark 选择器的选项列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}
 
#pragma mark 选择器每列的选项个数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return 5;
}
 
#pragma mark 每个选项的值
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    switch (component) {
        case 0:
            return @"第0列";
            break;
 
        case 1:
            return @"第1列";
            break;
 
        default:
            return @"第2列";
            break;
    }
}
@end

@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // 设置背景色为魄 self.view.backgroundColor = [UIColor whiteColor]; // 创建一个选择器 UIPickerView *picker = [[UIPickerView alloc] init]; picker.delegate = self; // 代理 picker.dataSource = self; // 数据源 picker.showsSelectionIndicator = YES; // 选择行高亮 [self.view addSubview:picker]; // 添加到视图 } #pragma mark - 数据源方法 #pragma mark 选择器的选项列数 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 3; } #pragma mark 选择器每列的选项个数 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return 5; } #pragma mark 每个选项的值 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { switch (component) { case 0: return @"第0列"; break; case 1: return @"第1列"; break; default: return @"第2列"; break; } } @end