Pickers应用程序

一、效果

1. 程序启动进入日期选取器界面，点击按钮显示所选的日期

2. 点击底下工具栏Single,进入单滚轮选取器，点击按钮提示所选信息

3. 点击底下工具栏Double，进入双滚轮选取器，两滚轮各自独立互不影响。点击按钮，提示所选信息

4. 点击底下工具栏Dependent,进入双滚轮选取器，其中第个滚轮随第一个滚轮的变化而变化。点击按钮提示所选信息

5. 点击底下工具栏Custom,进入自定义选取器。点击按钮，随机产生5张图片，只要有相连的3张图片，就胜利

二、分析

1. 根控制器是一个UITabBarController，控制5个UIViewController之间的切换

2. 在各个控制器的View上面拉选取器控件，设定数据源与委托对象

3. 在各个控制器上实现选取器内容的展现

三、实现

1. Main.storyboard布局

2. 文件

3. 属性列表文件

4. 由于是用storyboard实现的控件布局，所以并不用在主控制器上做什么，其中布局跳转都已经在storyboard里面完成了，现在主要是配置子控制器实现文件

5. DatePickerViewController.m

 1 //
 2 //  DatePickerViewController.m
 3 //  7.1-创建Pickers应用程序
 4 //
 5 //  Created by LinKun on 16/7/16.
 6 //  Copyright © 2016年 Apress. All rights reserved.
 7 //
 8 
 9 #import "DatePickerViewController.h"
10 
11 @interface DatePickerViewController ()
12 /** 日期选取器 */
13 @property (weak, nonatomic) IBOutlet UIDatePicker *datePicker;
14 
15 @end
16 
17 @implementation DatePickerViewController
18 
19 - (void)viewDidLoad {
20     [super viewDidLoad];
21     // Do any additional setup after loading the view.
22 }
23 
24 #pragma mark - 提示当前日期选取器所选日期
25 - (IBAction)buttonPressed:(UIButton *)sender {
26     // 提取选取器日期
27     NSDate *date = self.datePicker.date;
28     
29     // 警告信息
30     NSString *message = [NSString stringWithFormat:@"The date and time you selected is %@", date];
31     // 创建警告框
32     UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Date and Time Selected" message:message preferredStyle:UIAlertControllerStyleAlert];
33     UIAlertAction *action = [UIAlertAction actionWithTitle:@"That's true" style:UIAlertActionStyleDefault handler:nil];
34     [alert addAction:action];
35     [self presentViewController:alert animated:YES completion:nil];
36 }
37 
38 @end

6. SingleComponentPickerViewController.m

 1 //
 2 //  SingleComponentPickerViewController.m
 3 //  7.1-创建Pickers应用程序
 4 //
 5 //  Created by LinKun on 16/7/16.
 6 //  Copyright © 2016年 Apress. All rights reserved.
 7 //
 8 
 9 #import "SingleComponentPickerViewController.h"
10 
11 #pragma mark 遵循选取器的数据源、委托方法
12 @interface SingleComponentPickerViewController () <UIPickerViewDelegate, UIPickerViewDataSource>
13 /** 单轮选取器 */
14 @property (weak, nonatomic) IBOutlet UIPickerView *singlePicker;
15 /** 人物姓名 */
16 @property (strong, nonatomic) NSArray *characterNames;
17 
18 @end
19 
20 @implementation SingleComponentPickerViewController
21 
22 - (void)viewDidLoad {
23     [super viewDidLoad];
24     // Do any additional setup after loading the view.
25     // 加载数据
26     self.characterNames = @[@"Xiaoming", @"Maike", @"Qiongsi", @"Jieke", @"Jane", @"Aha"];
27     
28 }
29 
30 #pragma mark - 提示当前单轮选取器所选的内容
31 - (IBAction)SingleButton:(id)sender {
32     // 所选行索引
33     NSInteger row = [self.singlePicker selectedRowInComponent:0];
34     // 根据行索引找到对应行数据
35     NSString *selected = self.characterNames[row];
36     // 警告框标题
37     NSString *title = [NSString stringWithFormat:@"You sellected %@", selected];
38     
39     // 创建警告框
40     UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:@"Thank you for choosing." preferredStyle:UIAlertControllerStyleAlert];
41     // 警告按钮
42     UIAlertAction *action = [UIAlertAction actionWithTitle:@"You're welcome" style:UIAlertActionStyleDefault handler:nil];
43     
44     [alert addAction:action];
45     [self presentViewController:alert animated:YES completion:nil];
46     
47 }
48 
49 #pragma mark - 选取器数据源
50 #pragma mark 多少个滚轮
51 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
52     return 1;
53 }
54 #pragma mark 各个滚轮有多少行
55 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
56     return [self.characterNames count];
57 }
58 
59 #pragma mark 选取器委托
60 #pragma mark 选取器滚轮的行标题
61 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
62     return self.characterNames[row];
63 }
64 
65 
66 @end

7. DoubleComponentPickerViewController.m

 1 //
 2 //  DoubleComponentPickerViewController.m
 3 //  7.1-创建Pickers应用程序
 4 //
 5 //  Created by LinKun on 16/7/16.
 6 //  Copyright © 2016年 Apress. All rights reserved.
 7 //
 8 
 9 #import "DoubleComponentPickerViewController.h"
10 
11 #pragma mark 滚轮的索引
12 #define kCoolDrink 0
13 #define kSize 1
14 
15 @interface DoubleComponentPickerViewController () <UIPickerViewDataSource, UIPickerViewDelegate>
16 /** 双滚轮选取器 */
17 @property (weak, nonatomic) IBOutlet UIPickerView *doublePicker;
18 // 滚轮数据
19 @property (strong, nonatomic) NSArray *coolDrinkTypes;
20 @property (strong, nonatomic) NSArray *sizeTypes;
21 
22 @end
23 
24 @implementation DoubleComponentPickerViewController
25 
26 - (void)viewDidLoad {
27     [super viewDidLoad];
28     // Do any additional setup after loading the view.
29     // 加载数据
30     self.coolDrinkTypes = @[@"百事", @"可乐", @"雪碧", @"牛奶", @"柠檬汁", @"西瓜汁"];
31     self.sizeTypes = @[@"大杯", @"中杯", @"小杯"];
32 }
33 
34 #pragma mark - 提示所选信息
35 - (IBAction)DoubleButton:(UIButton *)sender {
36     // 提取各滚轮所选行索引
37     NSInteger coolDrinkRow = [self.doublePicker selectedRowInComponent:kCoolDrink];
38     NSInteger sizeRow = [self.doublePicker selectedRowInComponent:kSize];
39     // 提取行索引对应行数据
40     NSString *coolDrink = self.coolDrinkTypes[coolDrinkRow];
41     NSString *size = self.sizeTypes[sizeRow];
42     // 警告框提示信息
43     NSString *message = [NSString stringWithFormat:@"您点的 %@ %@ 马上送到！", coolDrink, size];
44     
45     // 创建警告框
46     UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Thank you for your order" message:message preferredStyle:UIAlertControllerStyleAlert];
47     UIAlertAction *action = [UIAlertAction actionWithTitle:@"Thank you" style:UIAlertActionStyleDefault handler:nil];
48     [alert addAction:action];
49     [self presentViewController:alert animated:YES completion:nil];
50     
51     
52 }
53 
54 #pragma mark - 选取器数据源
55 #pragma mark 滚轮数
56 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
57     return 2;
58 }
59 #pragma mark 行数
60 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
61     if (component == kCoolDrink) {
62         return [self.coolDrinkTypes count];
63     } else {
64         return [self.sizeTypes count];
65     }
66 }
67 
68 #pragma mark - 选取器委托
69 #pragma mark 行标题
70 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
71     if (component == kCoolDrink) {
72         return self.coolDrinkTypes[row];
73     } else {
74         return self.sizeTypes[row];
75     }
76 }
77 
78 
79 
80 @end

8. DependentComponentPickerViewController.m

  1 //
  2 //  DependentComponentPickerViewController.m
  3 //  7.1-创建Pickers应用程序
  4 //
  5 //  Created by LinKun on 16/7/16.
  6 //  Copyright © 2016年 Apress. All rights reserved.
  7 //
  8 
  9 #import "DependentComponentPickerViewController.h"
 10 
 11 #define kStateComponent 0
 12 #define kZipComponent 1
 13 
 14 @interface DependentComponentPickerViewController () <UIPickerViewDelegate, UIPickerViewDataSource>
 15 /** 依赖性滚轮 */
 16 @property (weak, nonatomic) IBOutlet UIPickerView *dependentPicker;
 17 
 18 // 滚轮数据
 19 @property (strong, nonatomic) NSDictionary *stateZips;
 20 /** 州名 */
 21 @property (strong, nonatomic) NSArray *states;
 22 /** 邮编 */
 23 @property (strong, nonatomic) NSArray *zips;
 24 
 25 @end
 26 
 27 @implementation DependentComponentPickerViewController
 28 
 29 - (void)viewDidLoad {
 30     [super viewDidLoad];
 31     // Do any additional setup after loading the view.
 32     // 获得应用资源包的引用并提取相应文件的资源路径
 33     NSBundle *bundle = [NSBundle mainBundle];
 34     NSURL *plistURL = [bundle URLForResource:@"statedictionary" withExtension:@"plist"];
 35     // 从资源文件导出数据
 36     self.stateZips = [NSDictionary dictionaryWithContentsOfURL:plistURL];
 37     // 字典所有键,按字母顺序排列
 38     NSArray *allStates = [self.stateZips allKeys];
 39     NSArray *sortedStates = [allStates sortedArrayUsingSelector:@selector(compare:)];
 40     self.states = sortedStates;
 41     
 42     NSString *selectedState = self.states[0];
 43     self.zips = self.stateZips[selectedState];
 44 }
 45 
 46 - (IBAction)selected:(UIButton *)sender {
 47     // 提取当前滚轮所选的数据
 48     NSInteger stateRow = [self.dependentPicker selectedRowInComponent:kStateComponent];
 49     NSInteger zipRow = [self.dependentPicker selectedRowInComponent:kZipComponent];
 50     NSString *state = self.states[stateRow];
 51     NSString *zip = self.zips[zipRow];
 52     // 警告框标题、警告信息
 53     NSString *title = [NSString stringWithFormat:@"You selected zip code %@.", zip];
 54     NSString *message = [NSString stringWithFormat:@"%@ is in %@", zip, state];
 55     
 56     UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
 57     
 58     UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
 59     [alert addAction:action];
 60     [self presentViewController:alert animated:YES completion:nil];
 61     
 62 }
 63 
 64 #pragma mark -
 65 #pragma mark 选取器数据源
 66 #pragma mark 滚轮数
 67 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
 68     return 2;
 69 }
 70 #pragma mark 行数
 71 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
 72     if (component == kStateComponent) {
 73         return [self.states count];
 74     } else {
 75         return [self.zips count];
 76     }
 77 }
 78 
 79 #pragma mark - 选取器委托
 80 #pragma mark 行标题
 81 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
 82     if (component == kStateComponent) {
 83         return self.states[row];
 84     } else {
 85         return self.zips[row];
 86     }
 87 }
 88 #pragma mark 滚轮数据改变
 89 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
 90     if (component == kStateComponent) {
 91         // 州
 92         NSString *selectedState = self.states[row];
 93         // 州对应的邮编集
 94         self.zips = self.stateZips[selectedState];
 95         
 96         // 重新加载邮编滚轮，默认选中邮编首行
 97         [self.dependentPicker reloadComponent:kZipComponent];
 98         [self.dependentPicker selectRow:0 inComponent:kZipComponent animated:YES];
 99         
100     }
101 }
102 #pragma mark 滚轮的宽
103 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
104     CGFloat pickerWidth = pickerView.bounds.size.width;
105     // 州滚轮占1/3、邮编滚轮占2/3
106     if (component == kZipComponent) {
107         return pickerWidth/3;
108     } else {
109         return 2 * pickerWidth/3;
110     }
111 }
112 
113 @end

9. CustomPickerViewController.m

  1 //
  2 //  CustomPickerViewController.m
  3 //  7.1-创建Pickers应用程序
  4 //
  5 //  Created by LinKun on 16/7/16.
  6 //  Copyright © 2016年 Apress. All rights reserved.
  7 //
  8 
  9 #import "CustomPickerViewController.h"
 10 #import <AudioToolbox/AudioToolbox.h>
 11 
 12 @interface CustomPickerViewController () <UIPickerViewDelegate, UIPickerViewDataSource>
 13 /** 自定义滚轮 */
 14 @property (weak, nonatomic) IBOutlet UIPickerView *customPicker;
 15 /** 显示胜利结果的标签 */
 16 @property (weak, nonatomic) IBOutlet UILabel *winLabel;
 17 /** 游戏开始按钮 */
 18 @property (weak, nonatomic) IBOutlet UIButton *button;
 19 /** 数据：图片 */
 20 @property (strong, nonatomic) NSArray *images;
 21 // 声音
 22 @property (assign, nonatomic) SystemSoundID winSoundID;
 23 @property (assign, nonatomic) SystemSoundID crushSoundID;
 24 
 25 @end
 26 
 27 @implementation CustomPickerViewController
 28 
 29 - (void)viewDidLoad {
 30     [super viewDidLoad];
 31     // Do any additional setup after loading the view.
 32     // 加载数据
 33     self.images = @[[UIImage imageNamed:@"seven"],
 34                     [UIImage imageNamed:@"bar"],
 35                     [UIImage imageNamed:@"crown"],
 36                     [UIImage imageNamed:@"cherry"],
 37                     [UIImage imageNamed:@"lemon"],
 38                     [UIImage imageNamed:@"apple"]];
 39     
 40     // 游戏开始初始化结果框为空
 41     self.winLabel.text = @" ";
 42 }
 43 
 44 #pragma mark - 游戏逻辑
 45 - (IBAction)spin:(UIButton *)sender {
 46     BOOL win = NO;
 47     /** 保存连续相同的图片的个数 */
 48     int numInRow = 1;
 49     /** 前一张图片索引 */
 50     int lastVal = -1;
 51     
 52     for (int i = 0; i < 5; i++) {
 53         /** 随机选择一张图片索引作为当前图片索引 */
 54         int newValue = arc4random_uniform((uint)[self.images count]);
 55         if (newValue == lastVal) {
 56             numInRow++;
 57         } else {
 58             numInRow = 1;
 59         }
 60         lastVal = newValue;
 61         
 62         // 选取器滚动到新值
 63         [self.customPicker selectRow:newValue inComponent:i animated:YES];
 64         [self.customPicker reloadComponent:i];
 65         if (numInRow >= 3) {
 66             win = YES;
 67         }
 68     }
 69     
 70     if (_crushSoundID == 0) {
 71         NSString *path = [[NSBundle mainBundle] pathForResource:@"crunch" ofType:@"wav"];
 72         NSURL *soundURL = [NSURL fileURLWithPath:path];
 73         AudioServicesCreateSystemSoundID((__bridge CFURLRef)soundURL, &_crushSoundID);
 74     }
 75     AudioServicesPlaySystemSound(_crushSoundID);
 76     if (win) {
 77         [self performSelector:@selector(playWinSound) withObject:nil afterDelay:.5];
 78         
 79     } else {
 80         [self performSelector:@selector(showButton) withObject:nil afterDelay:.5];
 81     }
 82     self.button.hidden = YES;
 83     self.winLabel.text = @" ";
 84 }
 85 
 86 #pragma mark -
 87 #pragma mark 数据源
 88 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
 89     return 5;
 90 }
 91 
 92 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
 93     return [self.images count];
 94 }
 95 
 96 #pragma mark - 选取器委托
 97 #pragma mark 行视图数据
 98 - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
 99     UIImage *image = self.images[row];
100     UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
101     return imageView;
102 }
103 #pragma mark 滚轮行高
104 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
105     return 100;
106 }
107 #pragma mark - 隐藏按钮
108 - (void)showButton {
109     self.button.hidden = NO;
110 }
111 #pragma mark - 播放声音
112 - (void)playWinSound {
113     if (_winSoundID == 0) {
114         NSURL *soundURL = [[NSBundle mainBundle] URLForResource:@"win" withExtension:@"wav"];
115         AudioServicesCreateSystemSoundID((__bridge CFURLRef)soundURL, &_winSoundID);
116     }
117     AudioServicesPlaySystemSound(_winSoundID);
118     self.winLabel.text = @"WINNER!";
119     [self performSelector:@selector(showButton) withObject:nil afterDelay:1.5];
120 }
121 
122 @end