iOS 三级UIPickerView使用

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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;}

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