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 @end16 17 @implementation DatePickerViewController18 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

 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 @end19 20 @implementation SingleComponentPickerViewController21 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

 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 013 #define kSize 114 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 @end23 24 @implementation DoubleComponentPickerViewController25 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

  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2/3106     if (component == kZipComponent) {107         return pickerWidth/3;108     } else {109         return 2 * pickerWidth/3;110     }111 }112 113 @end

  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 = http://www.mamicode.com/arc4random_uniform((uint)[self.images count]); 55         if (newValue =http://www.mamicode.com/= 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