iOS 三级UIPickerView使用

最新推荐文章于 2022-11-21 22:52:10 发布

yqmfly

最新推荐文章于 2022-11-21 22:52:10 发布

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分类专栏： IPhone开发

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本文提供了一个简单的三级Picker实现，适合初学者快速上手。详细介绍了如何配置数据源、选择标识和UI展示，通过实例代码帮助读者理解Picker的基本用法。

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最近写了一个简单的三级的Picker，给初学者一些提示，其实这个很简单，不多说，直接上代码
头文件代码

#import <UIKit/UIKit.h>

@interface PickersTestVC : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
{
    UIPickerView *pkView;
    UILabel *pkVText;

    //每一列的数据源
    NSArray *arr1;
    NSArray *arr2;
    NSArray *arr3;

    //每一列的选择标识
    int iDx1;
    int iDx2;
    int iDx3;
}

@end

源文件代码

#import "PickersTestVC.h"

#define FirstComponent 0
#define SecondComponent 1
#define ThirdComponent 2

@interface PickersTestVC ()

@end

@implementation PickersTestVC

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"选择器测试";

    arr1 = @[@"1",@"2",@"3",@"4",@"5"];
    arr2 = @[@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y"];
    arr3 = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"十",@"Ⅰ",@"Ⅱ",@"Ⅲ",@"Ⅳ",@"Ⅴ"];
    iDx1 = 0;
    iDx2 = iDx3 = iDx1;

    pkView = [[UIPickerView alloc]init];
    pkView.frame = CGRectMake(10, 100, SCREEN_WIDTH - 20, 160);
    pkView.delegate = self;
    pkView.dataSource = self;

    [self.view addSubview:pkView];

    pkVText = [[UILabel alloc]init];
    pkVText.frame = CGRectMake(10, 300, SCREEN_WIDTH - 20, 20);
    pkVText.text = [NSString stringWithFormat:@"第一列选择：%@，第二列选择：%@，第三列选择：%@",[arr1 objectAtIndex:iDx1],[arr2 objectAtIndex:iDx2],[arr3 objectAtIndex:iDx3]];;
    pkVText.backgroundColor = [UIColor grayColor];
    pkVText.font = [UIFont systemFontOfSize:12];
    [self.view addSubview:pkVText];
}

#pragma mark--UIPickerViewDataSource
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (component == FirstComponent) {
        return [arr1 count];
    }
    if (component==SecondComponent) {
        return [arr2 count];
    }
    if (component==ThirdComponent) {
        return [arr3 count];
    }
    return 0;
}


#pragma mark--UIPickerViewDelegate
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (component==FirstComponent) {
        return [arr1 objectAtIndex:row];
    }
    if (component==SecondComponent) {
        return [arr2 objectAtIndex:row];
    }
    if (component==ThirdComponent) {
        return [arr3 objectAtIndex:row];
    }
    return nil;
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSString *strSelect = @"";
    NSLog(@"row is %ld,Component is %ld",row,(long)component);

    strSelect = [NSString stringWithFormat:@"第一列选择：%@，第二列选择：%@，第三列选择：%@",[arr1 objectAtIndex:iDx1],[arr2 objectAtIndex:iDx2],[arr3 objectAtIndex:iDx3]];
    pkVText.text = strSelect;

}


- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
    if (component==FirstComponent) {
        return 90.0;
    }
    if (component==SecondComponent) {
        return 120.0;
    }
    if (component==ThirdComponent) {
        return 100.0;
    }
    return 0;
}