iPhone开发UI组件UIDatePickerView的预习

青旅半醒 2022-08-04 14:52 177阅读 0赞

新建工程如下：

编辑控制器的.h文件如下所示：

//
    //  ViewController.h
    //  UIDatePickerVIew
    //
    //  Created by apple on 15/9/2.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import <UIKit/UIKit.h>
    
    @interface ViewController : UIViewController <UIPickerViewDataSource,UIPickerViewDelegate>
    {
        int a;
        int b;
        int t;
    }
    
    @property (nonatomic, strong) UIPickerView *pickView;
    
    @property (nonatomic, strong) NSMutableArray *pickerNameArray;
    @property (nonatomic, strong) NSMutableArray *pickerPlaceArray;
    @property (nonatomic, strong) NSMutableDictionary *typeDictionary;
    @property (nonatomic, strong) UILabel * lblSelect;
    @property (nonatomic, strong) NSString *selectStr;
    
    @property (nonatomic, strong) NSTimer * timer;
    @property (nonatomic, strong) UIButton *btn;
    
    @property (nonatomic, strong) UIImageView *zhen;
    @property (nonatomic, strong) UIImageView *pan;
    
    @end

编辑控制器的.m文件如下所示：

//
    //  ViewController.m
    //  UIDatePickerVIew
    //
    //  Created by apple on 15/9/2.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import "ViewController.h"
    #define WIDTH    [UIScreen mainScreen].bounds.size.width
    #define HEIGHT  [UIScreen mainScreen].bounds.size.height
    
    @interface ViewController ()
    @property (nonatomic, strong) NSString *str1;
    @property (nonatomic, strong) NSString *str2;
    @property (nonatomic, strong) NSDate *start;
    @property (nonatomic, strong) NSDate *end;
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
    	[self assignForPickView];
        
        self.pickView = [[UIPickerView alloc] initWithFrame:CGRectMake(10, WIDTH/2+50, WIDTH-20, WIDTH/3)];
        self.pickView.backgroundColor = [UIColor yellowColor];
        self.pickView.dataSource = self;
        self.pickView.delegate = self;
        self.pickView.showsSelectionIndicator = YES;
        [self.view addSubview:self.pickView];
        
         // 显示数据
        self.lblSelect = [[UILabel alloc ] initWithFrame:CGRectMake(0, 10, WIDTH, WIDTH/6)];
        self.lblSelect .text = self.selectStr;
        self.lblSelect.textAlignment = NSTextAlignmentCenter;
        [self.view addSubview:self.lblSelect];
        
        // button
        self.btn = [[UIButton alloc] initWithFrame:CGRectMake(10, WIDTH/2+WIDTH/3+100, WIDTH-20, WIDTH/5)];
        [self.btn  setTitle:@"点击抽奖" forState:UIControlStateNormal];
        [self.btn setTitle:@"开始抽奖" forState:UIControlStateHighlighted];
        [self.btn addTarget:self action:@selector(chouJiang) forControlEvents:UIControlEventTouchUpInside];
        [self.btn setBackgroundColor:[UIColor redColor]];
        [self.view addSubview:self.btn];
        
        // 显示表盘
        self.pan = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, (WIDTH-40)/2, (WIDTH-40)/2)];
        self.pan.center = CGPointMake(WIDTH/2, 120);
        self.pan.image = [UIImage imageNamed:@"1.png"];
        [self.view addSubview:self.pan];
        
        // 显示表针
        self.zhen = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 11, (WIDTH - 40)/4)];
        self.zhen.center = CGPointMake(WIDTH/2, 120);
        self.zhen.image = [UIImage imageNamed:@"3.png"];
        [self.view addSubview:self.zhen];
        [self.view bringSubviewToFront:self.lblSelect];
        
    }
    
     //抽奖监听方法
    -(void)chouJiang
    {
         self.start  = [[NSDate alloc] init];
           NSLog(@"t1= %d",t);
        self.timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(jiang) userInfo:nil repeats:YES];
       
    }
    
    -(void) jiang
    {
        self.end = [[NSDate alloc] init];
        t = self.start.timeIntervalSince1970;
        int t2 = self.end.timeIntervalSince1970;
        NSLog(@"t2= %d  t1= %d",t2,t);
        if ((t2 - t) == 5 ) {
            [self.timer invalidate];
        }
        int b1 = arc4random()%100+100000;
          for (int i = 0; i<b1 ; i++) {
            self.zhen.transform = CGAffineTransformRotate(self.zhen.transform, -M_PI_4/180);
        }
        
        a = arc4random() % (self.pickerNameArray.count);
        NSMutableArray  *BB = [self.typeDictionary  objectForKey:self.pickerNameArray[a]];
        
        b = arc4random() % (BB.count);
        
        [self  pickerView:self.pickView didSelectRow:a inComponent:0];
        [self  pickerView:self.pickView didSelectRow:b inComponent:1];
        [self.pickView reloadComponent:0];
        [self.pickView  selectRow:a inComponent:0 animated:YES];
        
        
    }
    
    -(void) assignForPickView
    {
        self.pickerNameArray =[ [NSMutableArray alloc] initWithObjects:@"河南",@"北京",@"山东",@"河北" ,nil];
        NSMutableArray *hArr = [NSMutableArray arrayWithObjects:@"周口", @"郑州",@"焦作",@"驻马店",nil];
        NSMutableArray *bArr = [NSMutableArray arrayWithObjects:@"昌平",@"海淀",@"朝阳",@"丰台",@"大兴", nil];
        NSMutableArray *sArr = [NSMutableArray arrayWithObjects:@"青岛",@"烟台", nil];
        NSMutableArray *hBArr = [NSMutableArray arrayWithObjects:@"石家庄", nil];
        NSMutableArray *typeArr = [NSMutableArray arrayWithObjects:hArr,bArr,sArr,hBArr, nil];
        self.typeDictionary = [NSMutableDictionary dictionaryWithObjects:typeArr forKeys:self.pickerNameArray];
        self.pickerPlaceArray = hArr;
        
    }
    
    // 分为多少列
    -(NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView
    {
        return 2;  }
    
     // 每一列有多少行
    -(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
    {
        NSInteger row = 0;
        switch (component) {
            case 0:
                row = self.pickerNameArray.count;
                break;
            case 1:
                row = self.pickerPlaceArray.count;
                break;
        }
        return row;
    }
    
     //  利用系统自带的格式。
    -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
    {
        if (component == 0) {
            return self.pickerNameArray[row];
        }
        else
        {
            return self.pickerPlaceArray[row];
        }
      
    }
    
    // 自定义格式
    -(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
    {
        UILabel *contentLabel = nil;
        if (component == 0) {
            contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];
            contentLabel.textAlignment = NSTextAlignmentCenter;
            contentLabel.text = self.pickerNameArray[row];
            contentLabel.font = [UIFont systemFontOfSize:14];
            contentLabel.backgroundColor = [UIColor cyanColor];
        }else
        {
            contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 180, 30)];
            contentLabel.text = self.pickerPlaceArray[row];
            contentLabel.textAlignment = NSTextAlignmentCenter;
            contentLabel.font = [UIFont systemFontOfSize:14];
            contentLabel.backgroundColor = [UIColor darkGrayColor];
        }
        return contentLabel;
    }
    
    -(void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
    {
        switch (component) {
            case 0:
            {
                self.str1 = self.pickerNameArray[row];
                self.pickerPlaceArray = self.typeDictionary[self.str1];
                if (self.pickerPlaceArray.count >1) {
                    self.selectStr = [NSString stringWithFormat:@"%@, %@",self.str1,[self.pickerPlaceArray objectAtIndex:b]];
                }
                else
                {
                    self.selectStr = self.str1;
                
                }
                
                // 更新视图
                [pickerView reloadComponent:1];
                [pickerView selectRow:b inComponent:1 animated:YES];
            }
                break;
            case 1 :
            {
                self.str2 = self.pickerPlaceArray[row];
                self.selectStr = [NSString stringWithFormat:@"%@ ,%@",self.str1,self.str2];
                break;
            }
            break;
        }
        self.lblSelect.text = self.selectStr;
    }
    
      // 设置每一列的行高
    -(CGFloat) pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
    {
        return 40;
    }
    
    // 设置每一列的宽度
    -(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
    {
        CGFloat width = 0.0;
        if (component == 0) {
            width = 100;
        }
        else
            width = 180;
        return width;
    }
    - (void)didReceiveMemoryWarning
    {
        
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end

运行结果如下：

![Center][]

[Center]: /images/20220731/8dda43ce6f5741d496df48e30f6d9926.png