UIPickerView

1.UIPickView什么时候用？

通常在注册模块，当用户需要选择一些东西的时候，比如说城市，往往
弹出一个PickerView给他们选择。
 

UIPickView常见用法,演示实例程序

1> 独立的，没有任何关系 => 菜单系统。
2> 相关联的，下一列和第一列有联系=> 省会城市选择
3> 图文并帽， => 国旗选择

4.UIDatePicker什么时候用？
当用户选择日期的时候，一般弹出一个UIDatePicker给用户选择

 1 //
 2 //  ViewController.m
 3 //  01-点餐系统
 4 //
 5 //  Created by xiaomage on 15/6/9.
 6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 
11 @interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
12 
13 @property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
14 
15 @end
16 
17 @implementation ViewController
18 
19 - (void)viewDidLoad {
20     
21     [super viewDidLoad];
22     // Do any additional setup after loading the view, typically from a nib.
23   //设置代理方法方式如下，还有拖线，  
24     self.pickerView.delegate = self;
25     
26 }
27 
28 
29 // 返回pickerView有多少列
30 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
31 {
32     return 3;
33 }
34 
35 // 返回第component列有多少行
36 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
37 {
38     return 2;
39 }
40 
41 
42 #pragma mark - 代理
43 // 返回第component列的每一行的行高
44 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
45 {
46     return 80.0;
47 }
48 
49 // 返回第component列第row行的标题
50 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
51 {
52     return @"a";
53 }
54 
55 // NSAttributedString富文本属性: 可以描述文字大小和颜色
56 //- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component NS_AVAILABLE_IOS(6_0); // attributed title is favored if both methods are implemented
57 
58 
59 // 总结：如果同时实现返回字符串和view的方法，返回UIView的优先级比较高
60 // 返回第component列第row行的View
61 //- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
62 //{
63 //    UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 60, 60)];
64 //    
65 //    v.backgroundColor = [UIColor redColor];
66 //    
67 //    return v;
68 //}
69 
70 // 选中第component第row的时候调用
71 // __func__： 返回当前方法在哪个类里面调用
72 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
73 {
74     NSLog(@"%s---%ld-%ld",__func__,component,row);
75 }
76 
77 
78 @end
View Code
  1 //
  2 //  ViewController.m
  3 //  01-点餐系统
  4 //
  5 //  Created by xiaomage on 15/6/9.
  6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
  7 //
  8 
  9 #import "ViewController.h"
 10 
 11 // 分屏:cmd + option + return
 12 
 13 // 退出分屏：cmd + return
 14 
 15 @interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
 16 @property (weak, nonatomic) IBOutlet UILabel *frultLabel;
 17 @property (weak, nonatomic) IBOutlet UILabel *mainLabel;
 18 @property (weak, nonatomic) IBOutlet UILabel *drinkLabel;
 19 
 20 @property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
 21 
 22 
 23 @property (nonatomic, strong) NSArray *foods;
 24 
 25 @end
 26 
 27 @implementation ViewController
 28 
 29 // 点击随机的时候调用
 30 - (IBAction)random:(UIButton *)sender {
 31     
 32     // pickerView每一列随机选中一行
 33     
 34     // 随机选中的文字展示到label
 35     
 36     // cmd + option + [ 代码上跳
 37     // cmd + [ 代码左移
 38     for (int i = 0; i < 3; i++) {
 39         
 40         // 假设让第0列随机选中一行
 41         // 取出第0列的行数
 42         NSInteger count = [self.foods[i] count];
 43         
 44         int random = arc4random_uniform((u_int32_t)count);
 45         // 不会触发代理的选中方法
 46         [_pickerView selectRow:random inComponent:i animated:YES];
 47         
 48         // 主动给label赋值
 49         [self pickerView:nil didSelectRow:random inComponent:i];
 50     }
 51     
 52 }
 53 
 54 - (NSArray *)foods
 55 {
 56     if (_foods == nil) {
 57         
 58         // 加载Pilst文件
 59        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"foods.plist" ofType:nil];
 60         
 61         // 大数组：pickerView有多少列
 62         _foods = [NSArray arrayWithContentsOfFile:filePath];
 63         
 64     }
 65     
 66     return _foods;
 67 }
 68 
 69 - (void)viewDidLoad {
 70     
 71     [super viewDidLoad];
 72     // Do any additional setup after loading the view, typically from a nib.
 73     
 74     self.pickerView.delegate = self;
 75     
 76     // 初始化label标题
 77     
 78     for (int i = 0; i < 3; i++) {
 79         
 80         [self pickerView:nil didSelectRow:0 inComponent:i];
 81         
 82     }
 83     
 84 }
 85 // 返回pickerView有多少列
 86 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
 87 {
 88     return self.foods.count;
 89 }
 90 
 91 // 返回第component列有多少行
 92 - (NSInteger)r :(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
 93 {
 94     return [self.foods[component] count];
 95 }
 96 
 97 // 返回第component列第row行的标题
 98 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
 99 {
100     return self.foods[component][row];
101 }
102 
103 
104 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
105 {
106     return 45;
107 }
108 
109 // 给label赋值
110 // 选中第component列第row行的时候调用
111 // 注意：这个方法必须用户主动拖动pickerView，才会调用
112 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
113 {
114     
115     switch (component) {
116         case 0:
117             // 设置水果
118             _frultLabel.text = self.foods[component][row];
119             break;
120         case 1:
121             // 设置主食
122             _mainLabel.text = self.foods[component][row];
123             break;
124         case 2:
125             // 设置饮料
126             _drinkLabel.text = self.foods[component][row];
127             break;
128     }
129     
130     
131 }
132 
133 
134 @end
View Code

pickerView返回一个view

 1 //
 2 //  ViewController.m
 3 //  03-国旗选择
 4 //
 5 //  Created by xiaomage on 15/6/9.
 6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 
11 #import "XMGSubFlag.h"
12 
13 #import "XMGFlagView.h"
14 
15 @interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
16 @property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
17 
18 @property (nonatomic, strong) NSMutableArray *flags;
19 
20 @end
21 
22 @implementation ViewController
23 
24 //读取plist中的数据封装为模型
25 - (NSMutableArray *)flags
26 {
27     if (_flags == nil) {
28         
29         // 装flag模型
30         _flags = [NSMutableArray array];
31         
32         // 加载plist
33         NSString *filePath = [[NSBundle mainBundle] pathForResource:@"flags.plist" ofType:nil];
34         
35         NSArray *arr = [NSArray arrayWithContentsOfFile:filePath];
36         
37         for (NSDictionary *dict in arr) {
38             // 字典转模型
39             XMGFlag *flag = [XMGFlag flageWithDict:dict];
40             
41             [_flags addObject:flag];
42             
43         }
44     }
45     return _flags;
46 }
47 
48 - (void)viewDidLoad {
49     [super viewDidLoad];
50     // Do any additional setup after loading the view, typically from a nib.
51    
52     
53     _pickerView.dataSource = self;
54     
55     _pickerView.delegate = self;
56     
57 }
58 
59 //数据源方法，返回列数
60 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
61 {
62     return 1;
63 }
64 //读取模型数组返回列有多少行
65 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
66 {
67     
68     return self.flags.count;
69 }
70 //代理方法 返回一个view 
71 - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
72 {
73 //xib获取view,传入模型
74     XMGFlagView *flagView = [[NSBundle mainBundle] loadNibNamed:@"XMGFlagView" owner:nil options:nil][0];
75     
76     // 取出对应的模型
77     XMGFlag *flag = self.flags[row];
78     flagView.flag = flag;
79     
80     return flagView;
81 }
82 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
83 {
84     return 60;
85 }
86 
87 - (void)didReceiveMemoryWarning {
88     [super didReceiveMemoryWarning];
89     // Dispose of any resources that can be recreated.
90 }
91 
92 @end
View Code
 1 //
 2 //  XMGFlag.h
 3 //  03-国旗选择
 4 //
 5 //  Created by xiaomage on 15/6/9.
 6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 #import <UIKit/UIKit.h>
12 
13 @interface XMGFlag : NSObject
14 
15 @property (nonatomic, strong) NSString *name;
16 
17 @property (nonatomic, strong) UIImage *icon;
18 
19 // 写程序一定要有扩展性
20 
21 // instancetype: 自动识别当前是哪个类在调用，就会变成对应类的对象
22 
23 // 为什么不用id,id 不能使用点语法
24 // id 可以调用任何对象的方法，坏处：不利于编译器=检查错误
25 + (instancetype)flageWithDict:(NSDictionary *)dict;
26 
27 @end
28 
29 
30 //
31 //  XMGFlag.m
32 //  03-国旗选择
33 //
34 //  Created by xiaomage on 15/6/9.
35 //  Copyright (c) 2015年 xiaomage. All rights reserved.
36 //
37 
38 #import "XMGFlag.h"
39 
40 #import <objc/message.h>
41 
42 @implementation XMGFlag
43 
44 + (instancetype)flageWithDict:(NSDictionary *)dict
45 {
46     XMGFlag *flag = [[self alloc] init];
47     
48     // 利用KVC字典转模型
49     [flag setValuesForKeysWithDictionary:dict];
50     
51     
52 //    [dict enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
53 //        
54 //        
55 //        NSString *funcName = [NSString stringWithFormat:@"set%@",key.capitalizedString];
56 //        
57 //        if ([flag respondsToSelector:@selector(funcName)]) {
58 //            
59 //            [flag setValue:obj forKeyPath:key];
60 //            
61 //        }
62 //    }];
63     
64     
65     
66     
67     return flag;
68 }
69 
70 
71 - (void)setIcon:(NSString *)icon
72 {
73 //    NSLog(@"%s",__func__);
74     _icon = [UIImage imageNamed:icon];
75 }
76 
77 // 遍历字典里面所有的key
78 
79 //  key：name
80 //  就去模型中查找有没有setName:,直接调用这个对象setName:赋值
81 //  假如没有找到setName:。就会去模型中查找有没有_name属性，_name = value
82 //  假如没有找到_name,还会去模型中查找name属性
83 //  最终没有找到，就会直接报错。
84 
85 
86 @end
模型
 1 //
 2 //  XMGFlagView.h
 3 //  03-国旗选择
 4 //
 5 //  Created by xiaomage on 15/6/9.
 6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
 7 //
 8 
 9 #import <UIKit/UIKit.h>
10 @class XMGFlag;
11 @interface XMGFlagView : UIView
12 
13 @property (nonatomic, strong) XMGFlag *flag;
14 
15 @end
16 
17 
18 //
19 //  XMGFlagView.m
20 //  03-国旗选择
21 //
22 //  Created by xiaomage on 15/6/9.
23 //  Copyright (c) 2015年 xiaomage. All rights reserved.
24 //
25 #import "XMGFlag.h"
26 #import "XMGFlagView.h"
27 
28 @interface XMGFlagView ()
29 @property (weak, nonatomic) IBOutlet UIImageView *imageView;
30 @property (weak, nonatomic) IBOutlet UILabel *label;
31 
32 @end
33 
34 @implementation XMGFlagView
35 
36 
37 - (void)setFlag:(XMGFlag *)flag
38 {
39     _flag = flag;
40     
41     // 给子控件赋值
42     _label.text = flag.name;
43     _imageView.image = flag.icon;
44 }
45 /*
46 // Only override drawRect: if you perform custom drawing.
47 // An empty implementation adversely affects performance during animation.
48 - (void)drawRect:(CGRect)rect {
49     // Drawing code
50 }
51 */
52 
53 @end
view
 1 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="8191" systemVersion="15A284" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
 3     <dependencies>
 4         <deployment identifier="iOS"/>
 5         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8154"/>
 6     </dependencies>
 7     <objects>
 8         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
 9         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
10         <view contentMode="scaleToFill" id="YWJ-6W-ap9" customClass="XMGFlagView">
11             <rect key="frame" x="0.0" y="0.0" width="375" height="60"/>
12             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
13             <subviews>
14                 <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="bla-Fq-tBg">
15                     <rect key="frame" x="0.0" y="0.0" width="90" height="60"/>
16                     <animations/>
17                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
18                     <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
19                     <nil key="highlightedColor"/>
20                 </label>
21                 <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="LkB-3T-KX7">
22                     <rect key="frame" x="278" y="0.0" width="102" height="65"/>
23                     <animations/>
24                 </imageView>
25             </subviews>
26             <animations/>
27             <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
28             <nil key="simulatedStatusBarMetrics"/>
29             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
30             <connections>
31                 <outlet property="imageView" destination="LkB-3T-KX7" id="NPy-qW-igD"/>
32                 <outlet property="label" destination="bla-Fq-tBg" id="FNP-89-PLs"/>
33             </connections>
34             <point key="canvasLocation" x="298.5" y="287"/>
35         </view>
36     </objects>
37 </document>
xib

 生日键盘

 1 //
 2 //  ViewController.m
 3 //  04-键盘处理
 4 //
 5 //  Created by xiaomage on 15/6/9.
 6 //  Copyright (c) 2015年 xiaomage. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 
11 @interface ViewController ()<UITextFieldDelegate>
12 @property (weak, nonatomic) IBOutlet UITextField *birthdayField;
13 
14 @property (nonatomic, weak) UIDatePicker *datePicker;
15 
16 @end
17 
18 @implementation ViewController
19 
20 #pragma mark - UITextFieldDelegate
21 // 是否允许开始编辑
22 //- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
23 //{
24 //    return NO;
25 //}
26 
27 // 是否允许结束编辑
28 //- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
29 //{
30 //    return NO;
31 //}
32 
33 
34 // 是否允许用户输入文字
35 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
36     return NO;
37 }
38 
39 // 文本框开始编辑的时候调用
40 - (void)textFieldDidBeginEditing:(UITextField *)textField
41 {
42     // 给生日文本框赋值
43     [self dateChange:_datePicker];
44 }
45 - (void)viewDidLoad {
46     [super viewDidLoad];
47     // Do any additional setup after loading the view, typically from a nib.
48     _birthdayField.delegate = self;
49     
50     // 自定义生日键盘
51     [self setUpBirthdayKeyboard];
52 }
53 
54 // 自定义生日键盘
55 - (void)setUpBirthdayKeyboard
56 {
57     // 创建UIDatePicker
58     // 注意：UIDatePicker有默认的尺寸，可以不用设置frame
59     UIDatePicker *picker = [[UIDatePicker alloc] init];
60     
61     _datePicker = picker;
62     
63     // 设置地区 zh:中国
64     picker.locale = [NSLocale localeWithLocaleIdentifier:@"zh"];
65     
66     // 设置日期的模式
67     picker.datePickerMode = UIDatePickerModeDate;
68     
69     // 监听UIDatePicker的滚动
70     [picker addTarget:self action:@selector(dateChange:) forControlEvents:UIControlEventValueChanged];
71     
72     
73     _birthdayField.inputView = picker;
74 }
75 
76 // 当UIDatePicker滚动的时候调用
77 // 给生日文本框赋值
78 - (void)dateChange:(UIDatePicker *)datePicker
79 {
80     NSLog(@"%@",datePicker.date);
81     // 日期转换字符串
82     
83     NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
84     
85     fmt.dateFormat = @"yyyy-MM-dd";
86     
87     NSString *dateStr = [fmt stringFromDate:datePicker.date];
88     
89     _birthdayField.text = dateStr;
90 }
91 
92 - (void)didReceiveMemoryWarning {
93     [super didReceiveMemoryWarning];
94     // Dispose of any resources that can be recreated.
95 }
96 
97 @end
View Code
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原文地址：https://www.cnblogs.com/jiaozi-li/p/5666550.html