选择器，我想大家都不陌生，当需要用户去选择某些范围值内的一个固定值时，我们会采用选择器的方式。选择器可以直观的提示用户选择的值范围、统一信息的填写格式，同时也方便用户快速的进行选择，比如对于性别，正常情况下就只有男女两种情况，那这时候用一个选择器给用户进行选择的话，可以避免错误数据的输入，也更方便用户去填写。再比如需要获取用户的生日信息时，采用选择器的方式可以统一生日的格式，如果让用户自行输入的话，可能会出现各种各样的生日信息格式，不利于数据的存储，但是采用选择器的方式的话，用户可找到对应的日期进行选择即可。
在iOS有专门的一个选择器类UIPickerView，进入UIPickerView的头文件，我们可以发现 UIPickerView直接继承了UIView，其事件处理通过代理方法完成，所以创建UIPickerView的时候记得签它的代理UIPickerViewDataSource和UIPickerViewDelegate。其实它和UITbleView有点像，不过UIPickerView还多了个列属性，UITbleView我们都很熟了，所以可以对比UITbleView的相关属性和代理方法来学习记忆UIPickerView。
一． UIPickerView的代理方法
（1）UIPickerViewDataSource对应的代理方法有（其代理方法必须要实现）：
返回显示的列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
返回每一列中需要显示的行数
（2）UIPickerViewDelegate对应的代理方法（其代理方法根据需求进行选择性实现）：
返回每一列的宽度
返回每一列的高度
返回UIPickerView控件中指定列的列表项的要显示的内容
返回UIView，作为该UIPickerView控件中指定列的指定行的显示视图
选择指定列中的指定行
二、UIPickerView和UIDatePicker。
UIDatePicker是系统帮我们封装好的一个时间日期选择器，继承于UIControl，UIDatePicker有一定的局限性，因为它只有四种显示样式：
UIDatePickerModeTime, UIDatePickerModeDate, UIDatePickerModeDateAndTime, UIDatePickerModeCountDownTimer,
如果需求和这四种样式都不符合的话，那么就没办法使用UIDatePicker，比如当只需要显示年、月信息的时候，显然UIDatePicker没办法满足我们的需求，那这时我们只能通过UIPickerView来自定义自己想要的选择器。
三、UIPickerView的自定义使用
（1）创建基类继承于UIView的WXZBasePickView。
我们常见的选择器的样式是一个带透明背景色的view，底部是内容的选择器，有确定和取消按钮，大致如图：
所以我们创建一个基类view，这个view的样式如图所示样式，之后根据内容的差别创建基于该view的选择器。
在.h中声明各个属性及方法
#import <UIKit/UIKit.h>@interface WXZBasePickView : UIView@property (nonatomic, strong) UIView *contentView;//选择器@property (nonatomic, strong)UIPickerView *pickerView;//取消按钮@property (nonatomic, strong)UIButton *cancelButton; //确定按钮@property (nonatomic, strong)UIButton *confirmButton;//选择器每一列的高度@property (nonatomic, assign)CGFloat pickerViewHeight;/** * 创建视图,初始化视图时初始数据 */- (void)initPickView;/** * 确认按钮的点击事件 */- (void)clickConfirmButton;/** * pickerView的显示 */- (void)show;/** * 移除pickerView */- (void)disMiss;@end
在.m中实现相关方法
#import "WXZBasePickView.h"#define ScreenWidth [UIScreen mainScreen].bounds.size.width#define ScreenHeight [UIScreen mainScreen].bounds.size.height@implementation WXZBasePickView- (instancetype)init{ self = [super init]; if (self) { _pickerViewHeight = 250; self.bounds = [UIScreen mainScreen].bounds; self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.64]; self.layer.opacity = 0.0; UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(disMiss)]; self.userInteractionEnabled = YES; [self addGestureRecognizer:tap]; [self addSubview:self.contentView]; [self.contentView addSubview:self.pickerView]; [self.contentView addSubview:self.cancelButton]; [self.contentView addSubview:self.confirmButton]; [self initPickView]; } return self;}//初始化选择器内容，创建子类时需实现该父类方法-(void)initPickView{}//点击确定按钮- (void)clickConfirmButton{ [self disMiss];}//点击取消按钮- (void) clickCancelButton{ [self disMiss];}//显示选择器 - (void)show{ [[UIApplication sharedApplication].keyWindow addSubview:self]; [self setCenter:[UIApplication sharedApplication].keyWindow.center]; [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self]; CGRect frame = self.contentView.frame; frame.origin.y -= self.contentView.frame.size.height; [UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ [self.layer setOpacity:1.0]; self.contentView.frame = frame; } completion:^(BOOL finished) { }]; }//移除选择器- (void)disMiss{ CGRect frame = self.contentView.frame; frame.origin.y += self.contentView.frame.size.height; [UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ [self.layer setOpacity:0.0]; self.contentView.frame = frame; } completion:^(BOOL finished) { [self removeFromSuperview]; }];}//设置选择器的高度- (void)setPickerViewHeight:(CGFloat)pickerViewHeight{ _pickerViewHeight = pickerViewHeight; self.contentView.frame = CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, self.contentView.frame.size.width, pickerViewHeight);}- (UIView *)contentView{ if (!_contentView) { _contentView = [[UIView alloc]initWithFrame:CGRectMake(0, ScreenHeight, ScreenWidth, self.pickerViewHeight)]; [_contentView setBackgroundColor:[UIColor whiteColor]]; } return _contentView;}- (UIPickerView *)pickerView{ if (!_pickerView) { _pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 0, self.contentView.frame.size.width, self.contentView.frame.size.height)]; [_pickerView setBackgroundColor:[UIColor whiteColor]]; } return _pickerView;}- (UIButton *)cancelButton{ if (!_cancelButton) { _cancelButton = [[UIButton alloc]initWithFrame:CGRectMake(16, 0, 44, 44)]; [_cancelButton setTitle:@"取消" forState:UIControlStateNormal]; [_cancelButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal]; [_cancelButton.titleLabel setFont:[UIFont systemFontOfSize:16]]; [_cancelButton addTarget:self action:@selector(clickCancelButton) forControlEvents:UIControlEventTouchUpInside]; } return _cancelButton;}- (UIButton *)confirmButton{ if (!_confirmButton) { _confirmButton = [[UIButton alloc]initWithFrame:CGRectMake(self.contentView.frame.size.width - self.cancelButton.frame.size.width - self.cancelButton.frame.origin.x, self.cancelButton.frame.origin.y, self.cancelButton.frame.size.width, self.cancelButton.frame.size.height)]; [_confirmButton setTitle:@"确定" forState:UIControlStateNormal]; [_confirmButton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; [_confirmButton.titleLabel setFont:[UIFont systemFontOfSize:16]]; [_confirmButton addTarget:self action:@selector(clickConfirmButton) forControlEvents:UIControlEventTouchUpInside]; } return _confirmButton;}@end(2)、自定义一个日期选择器，可选择显示年、月或者年、月、日以及是否显示“至今”选项。
创建继承于我们自定义好的WXZBasePickView的日期选择器WXZPickDateView
.h声明相关属性和方法
#import "WXZBasePickView.h"@class WXZBasePickView;//选择器的选择代理方法@protocol PickerDateViewDelegate<NSObject>- (void)pickerDateView:(WXZBasePickView *)pickerDateView selectYear:(NSInteger)year selectMonth:(NSInteger)month selectDay:(NSInteger)day;@end@interface WXZPickDateView : WXZBasePickView@property(nonatomic, weak)id <PickerDateViewDelegate>delegate ;@property(nonatomic, assign)BOOL isAddYetSelect;//是否增加至今的选项@property(nonatomic, assign)BOOL isShowDay;//是否显示日//设置默认显示的值-(void)setDefaultTSelectYear:(NSInteger)defaultSelectYear defaultSelectMonth:(NSInteger)defaultSelectMonth defaultSelectDay:(NSInteger)defaultSelectDay;@end
.m实现相关方法
#import "WXZPickDateView.h"@interface WXZPickDateView()<UIPickerViewDataSource, UIPickerViewDelegate>/** 选择的年 */@property (nonatomic, assign)NSInteger selectYear;/** 选择的月 */@property (nonatomic, assign)NSInteger selectMonth;/** 选择的日 */@property (nonatomic, assign)NSInteger selectDay;@property (nonatomic, assign)NSInteger currentYear;@property (nonatomic, assign)NSInteger currentMonth;@property (nonatomic, assign)NSInteger currentDay;@property (nonatomic, assign)NSInteger defaultYear;@property (nonatomic, assign)NSInteger defaultMonth;@property (nonatomic, assign)NSInteger defaultDay;@property (nonatomic, assign)NSInteger minShowYear;@property (nonatomic, assign)NSInteger yearSum;@end@implementation WXZPickDateView- (void)initPickView{ [super initPickView]; _minShowYear = 1940;//最小年份 NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; // 获取当前日期 NSDate* dt = [NSDate date]; // 指定获取指定年、月、日、时、分、秒的信息 unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday; // 获取不同时间字段的信息 NSDateComponents* comp = [gregorian components: unitFlags fromDate:dt]; _yearSum = comp.year-_minShowYear+1; _currentYear=comp.year; _currentMonth=comp.month; _currentDay=comp.day; _selectYear = comp.year; _selectMonth = comp.month; _selectDay = comp.day; _defaultYear = comp.year; _defaultMonth = comp.month; _defaultDay=comp.day; [self.pickerView setDelegate:self]; [self.pickerView setDataSource:self];}-(void)setDefaultTSelectYear:(NSInteger)defaultSelectYear defaultSelectMonth:(NSInteger)defaultSelectMonth defaultSelectDay:(NSInteger)defaultSelectDay{ if (defaultSelectYear!=0) { _defaultYear=defaultSelectYear; } if (defaultSelectMonth!=0) { _defaultMonth = defaultSelectMonth; } if (defaultSelectDay!=0) { _defaultDay=defaultSelectDay; } if (defaultSelectYear==-1) { _defaultYear=_currentYear+1; _defaultMonth=1; _defaultDay=1; } [self.pickerView selectRow:(_defaultYear - _minShowYear) inComponent:0 animated:NO]; [self.pickerView reloadComponent:1]; [self.pickerView selectRow:(_defaultMonth - 1) inComponent:1 animated:NO]; if (_isShowDay==YES) { [self.pickerView reloadComponent:2]; [self.pickerView selectRow:_defaultDay inComponent:1 animated:NO]; } [self refreshPickViewData];}-(void)setIsAddYetSelect:(BOOL)isAddYetSelect{ _isAddYetSelect = isAddYetSelect;}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{//判断是否要显示日，如果显示则返回3列，反之返回2列 if (_isShowDay==YES) { return 3; }else{ return 2; }}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ if (component == 0) { if (_isAddYetSelect==YES) { //显示至今选项的话，需要比总共要显示的年份多返回一行 return self.yearSum+1; }else{ return self.yearSum; } }else if(component == 1) { NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear; if (yearSelected==_currentYear+1) { //至今选项的时候月份信息不返回 return 0; }else{ return 12; } }else { NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear; if (yearSelected==_currentYear+1) { //至今选项的时候日信息不返回 return 0; }else{ NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear; NSInteger monthSelected = [pickerView selectedRowInComponent:1] + 1; return [self getDaysWithYear:yearSelected month:monthSelected]; } }}//根据年、月判断日期天数- (NSInteger)getDaysWithYear:(NSInteger)year month:(NSInteger)month{ switch (month) { case 1: return 31; break; case 2: if (year%400==0 || (year%100!=0 && year%4 == 0)) { return 29; }else{ return 28; } break; case 3: return 31; break; case 4: return 30; break; case 5: return 31; break; case 6: return 30; break; case 7: return 31; break; case 8: return 31; break; case 9: return 30; break; case 10: return 31; break; case 11: return 30; break; case 12: return 31; break; default: return 0; break; }}- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{ //每一行的高度 return 36;}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ NSInteger selectYear; NSInteger selectMonth; switch (component) { case 0: [pickerView reloadComponent:1]; if (_isAddYetSelect==YES) { selectYear = row+_minShowYear+1; }else{ selectYear = row+_minShowYear; } if (_isShowDay==YES) { [pickerView reloadComponent:2]; } break; case 1: selectMonth = row+1; if (_isShowDay==YES) { [pickerView reloadComponent:2]; } default: break; } [self refreshPickViewData];}- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{ NSString *text; if (component == 0) { if (_isAddYetSelect==YES) { if (row+_minShowYear==_currentYear+1) { text=@"至今"; }else{ text = [NSString stringWithFormat:@"%zd年", row + _minShowYear]; } }else{ text = [NSString stringWithFormat:@"%zd年", row + _minShowYear]; } }else if (component == 1){ if (_isAddYetSelect==YES) { NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear; if (yearSelected==_currentYear+1) { text = [NSString stringWithFormat:@""]; }else{ text = [NSString stringWithFormat:@"%zd月", row + 1]; } }else{ text = [NSString stringWithFormat:@"%zd月", row + 1]; } }else{ text = [NSString stringWithFormat:@"%zd日", row + 1]; } UILabel *label = [[UILabel alloc]init]; label.textAlignment = 1; label.font = [UIFont systemFontOfSize:16]; label.text = text; return label;}- (void)clickConfirmButton{ if ([self.delegate respondsToSelector:@selector(pickerDateView:selectYear:selectMonth:selectDay:)]) { [self.delegate pickerDateView:self selectYear:self.selectYear selectMonth:self.selectMonth selectDay:self.selectDay]; } [super clickConfirmButton];}- (void)refreshPickViewData{ self.selectYear = [self.pickerView selectedRowInComponent:0] + self.minShowYear; self.selectMonth = [self.pickerView selectedRowInComponent:1] + 1; if (_isShowDay==YES) { self.selectDay = [self.pickerView selectedRowInComponent:2] + 1; }}- (void)setYearLeast:(NSInteger)yearLeast{ _minShowYear = yearLeast;}- (void)setYearSum:(NSInteger)yearSum{ _yearSum = yearSum;}-(void)setIsShowDay:(BOOL)isShowDay{ _isShowDay=isShowDay;}@end（3） 创建继承于WXZBasePickView的时间选择器WXZPickTimeView。
.h声明属性及相关方法
#import "WXZBasePickView.h"@class WXZPickTimeView;@protocol PickTimeViewDelegate<NSObject>- (void)pickerTimeView:(WXZPickTimeView *)pickerTimeView selectHour:(NSInteger)hour selectMinute:(NSInteger)minute ;@end@interface WXZPickTimeView : WXZBasePickView@property(nonatomic, weak)id <PickTimeViewDelegate>delegate ;-(void)setDefaultHour:(NSInteger)hour defaultMinute:(NSInteger)minute ;@end
.m实现相关方法
#import "WXZPickTimeView.h"@interface WXZPickTimeView () <UIPickerViewDataSource, UIPickerViewDelegate>{ UIDatePicker *_datePicker;}@property (nonatomic, assign)NSInteger selectHour;@property (nonatomic, assign)NSInteger selectMinute;@property (nonatomic, assign)NSInteger day;@property (nonatomic, assign)NSInteger defaultHour;@property (nonatomic, assign)NSInteger defaultMinute;@end@implementation WXZPickTimeView - (void)initPickView{ [super initPickView]; NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; // 获取当前日期 NSDate* dt = [NSDate date]; // 定义一个时间字段的旗标，指定将会获取指定年、月、日、时、分、秒的信息 unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday; // 获取不同时间字段的信息 NSDateComponents* comp = [gregorian components: unitFlags fromDate:dt]; _selectHour=comp.hour; _selectMinute=comp.minute; [self.pickerView setDelegate:self]; [self.pickerView setDataSource:self]; [self.pickerView selectRow:_selectHour inComponent:0 animated:NO]; [self.pickerView selectRow:_selectMinute inComponent:1 animated:NO];}-(void)setDefaultHour:(NSInteger)hour defaultMinute:(NSInteger)minute{ if (hour!=0) { _defaultHour=hour; }else{ _defaultHour=_selectHour; } if (minute!=0) { _defaultMinute = minute; }else{ _defaultMinute=_selectMinute; } [self.pickerView selectRow:_defaultHour inComponent:0 animated:NO]; [self.pickerView reloadComponent:1]; [self.pickerView selectRow:_defaultMinute inComponent:1 animated:NO]; [self refreshPickTimeViewData];}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ return 2;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ if (component == 0) { return 24; }else { return 60; }}- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{ return 36;}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ switch (component) { case 0: [pickerView reloadComponent:1]; break; case 1: default: break; } [self refreshPickTimeViewData];}- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{ NSString *text; if (component == 0) { if (row<10) { text = [NSString stringWithFormat:@"0%zd时", row]; }else{ text = [NSString stringWithFormat:@"%zd时", row]; } }else if (component == 1){ if (row<10) { text = [NSString stringWithFormat:@"0%zd分", row ]; }else{ text = [NSString stringWithFormat:@"%zd分", row ]; } }else{ } UILabel *label = [[UILabel alloc]init]; label.textAlignment = 1; label.font = [UIFont systemFontOfSize:16]; label.text = text; return label;}- (void)clickConfirmButton{ if ([self.delegate respondsToSelector:@selector(pickerTimeView:selectHour:selectMinute:)]) { [self.delegate pickerTimeView:self selectHour:self.selectHour selectMinute:self.selectMinute]; } [super clickConfirmButton];}- (void)refreshPickTimeViewData{ self.selectHour = [self.pickerView selectedRowInComponent:0]; self.selectMinute = [self.pickerView selectedRowInComponent:1];}@end（4）创建继承于WXZBasePickView的城市选择器WXZPickCityView。
.h声明相关属性和方法
#import "WXZBasePickView.h"@class WXZPickCityView;@protocol PickerCityViewDelegate<NSObject>- (void)pickerArea:(WXZPickCityView *)pickerArea selectProvince:(NSString *)province selectCity:(NSString *)city;@end@interface WXZPickCityView : WXZBasePickView@property(nonatomic, weak)id <PickerCityViewDelegate>delegate ;/**设置默认的省市*/-(void)setDefaultCity:(NSString *)defaultCity DefaultProvience:(NSString *)defaultProvience;@end
.m实现相关方法
#import "WXZPickCityView.h"@interface WXZPickCityView()<UIPickerViewDataSource, UIPickerViewDelegate>@property (nonatomic, strong, nullable)NSArray *areaDataSource;@property (nonatomic, strong, nullable)NSMutableArray *provinceArray;@property (nonatomic, strong, nullable)NSMutableArray *cityArray;@property (nonatomic, strong, nullable)NSMutableArray *selectedArray;//当前选中的数组@property (nonatomic, strong, nullable)NSString *selectProvince;@property (nonatomic, strong, nullable)NSString *selectCity;@end@implementation WXZPickCityView- (void)initPickView{ [super initPickView]; for (NSDictionary *dic in self.areaDataSource) { [self.provinceArray addObject:dic[@"state"]]; } NSMutableArray *citysArr = [NSMutableArray arrayWithArray:[self.areaDataSource firstObject][@"cities"]]; for (NSDictionary *dic in citysArr) { [self.cityArray addObject:dic[@"city"]]; } self.selectProvince = self.provinceArray[0]; self.selectCity = self.cityArray[0]; [self.pickerView setDelegate:self]; [self.pickerView setDataSource:self];}//设置默认显示的省市-(void)setDefaultCity:(NSString *)defaultCity DefaultProvience:(NSString *)defaultProvience{ for (NSInteger i = 0; i<_provinceArray.count; i++) { if ([_provinceArray[i] isEqualToString:defaultProvience]) { [self.pickerView selectRow:i inComponent:0 animated:NO]; self.selectedArray = self.areaDataSource[i][@"cities"]; [self.cityArray removeAllObjects]; [self.selectedArray enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL * _Nonnull stop) { [self.cityArray addObject:obj[@"city"]]; }]; for (NSInteger j= 0; j<_cityArray.count; j++) { if ([defaultCity isEqualToString:_cityArray[j]]) { [self.pickerView selectRow:i inComponent:0 animated:NO]; [self.pickerView reloadComponent:1]; [self.pickerView selectRow:j inComponent:1 animated:NO]; [self refreshSelectAreaData]; } } } }}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ return 2;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ if (component == 0) { return self.provinceArray.count; }else { return self.cityArray.count; }}- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{ return 36;}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ if (component == 0) { self.selectedArray = self.areaDataSource[row][@"cities"]; [self.cityArray removeAllObjects]; [self.selectedArray enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL * _Nonnull stop) { [self.cityArray addObject:obj[@"city"]]; }]; [pickerView reloadComponent:1]; [pickerView selectRow:0 inComponent:1 animated:YES]; }else if (component == 1) { if (self.selectedArray.count == 0) { self.selectedArray = [self.areaDataSource firstObject][@"cities"]; } }else{ } [self refreshSelectAreaData];}- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{ for(UIView *singleLine in pickerView.subviews) { if (singleLine.frame.size.height < 1) { singleLine.backgroundColor =[UIColor grayColor]; } } NSString *text; if (component == 0) { text = self.provinceArray[row]; }else if (component == 1){ text = self.cityArray[row]; }else{ } UILabel *label = [[UILabel alloc]init]; label.textAlignment = 1; label.font = [UIFont systemFontOfSize:16]; label.text = text; return label;}- (void)clickConfirmButton{ [self.delegate pickerArea:self selectProvince:self.selectProvince selectCity:self.selectCity]; [super clickConfirmButton];}- (void)refreshSelectAreaData{ NSInteger provienceIndex = [self.pickerView selectedRowInComponent:0]; NSInteger cityIndex = [self.pickerView selectedRowInComponent:1]; self.selectProvince = self.provinceArray[provienceIndex]; self.selectCity = self.cityArray[cityIndex];}- (NSArray *)areaDataSource{ if (!_areaDataSource) { NSString *path = [[NSBundle bundleForClass:[WXZPickCityView class]] pathForResource:@"area" ofType:@"plist"]; _areaDataSource = [[NSArray alloc]initWithContentsOfFile:path]; } return _areaDataSource;}- (NSMutableArray *)provinceArray{ if (!_provinceArray) { _provinceArray = [NSMutableArray array]; } return _provinceArray;}- (NSMutableArray *)cityArray{ if (!_cityArray) { _cityArray = [NSMutableArray array]; } return _cityArray;}- (NSMutableArray *)selectedArray{ if (!_selectedArray) { _selectedArray = [NSMutableArray array]; } return _selectedArray;}@end（5）创建继承于WXZBasePickView的单列选择器WXZCustomPickView，可根据传进来的数组显示相关的选择内容
.h声明相关属性和方法
#import "WXZBasePickView.h"@class WXZCustomPickView;@protocol CustomPickViewDelegate<NSObject>- (void)customPickView:(WXZCustomPickView *)customPickView selectedTitle:(NSString *)selectedTitle;@end@interface WXZCustomPickView :WXZBasePickView@property (nonatomic, strong)NSMutableArray *dataArray;@property(nonatomic, copy)NSString *defalutSelectRowStr;@property(nonatomic, weak)id <CustomPickViewDelegate>delegate;@end
.m实现相关方法
#import "WXZCustomPickView.h"@interface WXZCustomPickView()<UIPickerViewDataSource, UIPickerViewDelegate>/** 1.选中的字符串 */@property (nonatomic, strong, nullable)NSString *selectedTitle;@end@implementation WXZCustomPickView- (void)initPickView{ [super initPickView]; _dataArray=[NSMutableArray mutableCopy]; [self.pickerView setDelegate:self]; [self.pickerView setDataSource:self];}-(void)setDefalutSelectRowStr:(NSString *)defalutSelectRowStr{ _defalutSelectRowStr=defalutSelectRowStr; for (NSInteger i = 0; i<_dataArray.count; i++) { if ([_dataArray[i] isEqualToString:_defalutSelectRowStr]) { [self.pickerView reloadAllComponents]; [self.pickerView selectRow:i inComponent:0 animated:NO]; } }}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ return 1;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ return self.dataArray.count;}- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{ return 36;}- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{ return self.frame.size.width;}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ self.selectedTitle = self.dataArray[row];}- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{ for(UIView *singleLine in pickerView.subviews) { if (singleLine.frame.size.height < 1) { singleLine.backgroundColor =[UIColor grayColor]; } } UILabel *label = [[UILabel alloc]init]; label.font=[UIFont systemFontOfSize:16]; label.textAlignment = 1; label.text=self.dataArray[row]; return label;}#pragma mark -点击确定按钮- (void)clickConfirmButton{ [self.delegate customPickView:self selectedTitle:self.selectedTitle]; [super clickConfirmButton];}- (void)setDataArray:(NSMutableArray *)dataArray{ _dataArray = dataArray; _selectedTitle = dataArray.firstObject; [self.pickerView reloadAllComponents];}@end这样，几种类型的选择器我们都定义好了，在需要选择器的地方，根据需求创建相应的选择器即可。
四、如何使用已创建好的自定义选择器
引入自定义好的选择器，声明相关属性，签相关协议
#import "ViewController.h"#import "WXZPickDateView.h"#import "WXZPickAreaView.h"#import "WXZPickTimeView.h"#import "WXZCustomPickView.h"@interface ViewController ()<PickerDateViewDelegate,PickerAreaViewDelegate,PickTimeViewDelegate,CustomPickViewDelegate>{ UIButton *dateButton; UIButton *selectAreabutton; UIButton *selectTimeButton; UIButton *singlePickViewSelectButton; BOOL isShowDay;//是否显示日信息}@end创建相应的按钮，触发相应的选择器
- (void)viewDidLoad { [super viewDidLoad]; dateButton=[UIButton buttonWithType:UIButtonTypeCustom]; dateButton.frame=CGRectMake(100, 100, 100, 50); [dateButton setTitle:@"选择日期" forState:UIControlStateNormal]; [self.view addSubview:dateButton]; [dateButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [dateButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside]; dateButton.tag = 1000; selectAreabutton=[UIButton buttonWithType:UIButtonTypeCustom]; selectAreabutton.frame=CGRectMake(100, 200, 100, 50); [selectAreabutton setTitle:@"选择地区" forState:UIControlStateNormal]; [self.view addSubview:selectAreabutton]; [selectAreabutton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [selectAreabutton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside]; selectAreabutton.tag = 1001; selectTimeButton=[UIButton buttonWithType:UIButtonTypeCustom]; selectTimeButton.frame=CGRectMake(100, 300, 100, 50); [selectTimeButton setTitle:@"选择时间" forState:UIControlStateNormal]; [self.view addSubview:selectTimeButton]; [selectTimeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [selectTimeButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside]; selectTimeButton.tag = 1002; singlePickViewSelectButton=[UIButton buttonWithType:UIButtonTypeCustom]; singlePickViewSelectButton.frame=CGRectMake(100, 400, 100, 50); [singlePickViewSelectButton setTitle:@"单个数据选择器" forState:UIControlStateNormal]; [self.view addSubview:singlePickViewSelectButton]; [singlePickViewSelectButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [singlePickViewSelectButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside]; singlePickViewSelectButton.tag = 1003;}按钮的点击事件：
-(void)pickViewSelect:(UIButton *)button{ if (button.tag==1000) { WXZPickDateView *pickerDate = [[WXZPickDateView alloc]init]; [pickerDate setIsAddYetSelect:YES];//是否显示至今选项 [pickerDate setIsShowDay:YES];//是否显示日信息 [pickerDate setDefaultTSelectYear:2007 defaultSelectMonth:4 defaultSelectDay:1];//设定默认显示的日期 [pickerDate setValidTime:2010]; [pickerDate setDelegate:self]; [pickerDate show]; }else if (button.tag==1001){ WXZPickAreaView *pickerArea = [[WXZPickAreaView alloc]init]; [pickerArea setDelegate:self]; [pickerArea setDefaultCity:@"上海" DefaultProvience:@"上海"]; [pickerArea show]; [self.view endEditing:YES]; }else if (button.tag==1002){ WXZPickTimeView *pickerArea = [[WXZPickTimeView alloc]init]; [pickerArea setDelegate:self]; [pickerArea setDefaultHour:14 defaultMinute:20]; [pickerArea show]; [self.view endEditing:YES]; }else{ NSMutableArray *arrayData = [NSMutableArray arrayWithObjects:@"2k以下",@"2k-5k",@"5k-10k",@"10k-15k",@"15k-25k",@"25k-50k",@"50k以上", nil]; WXZCustomPickView *pickerSingle = [[WXZCustomPickView alloc]init]; [pickerSingle setDataArray:arrayData]; [pickerSingle setDefalutSelectRowStr:arrayData[0]]; [pickerSingle setDelegate:self]; [pickerSingle show]; [self.view endEditing:YES]; }}选择器的代理方法
-(void)pickerDateView:(WXZBasePickView *)pickerDateView selectYear:(NSInteger)year selectMonth:(NSInteger)month selectDay:(NSInteger)day{ NSLog(@"选择的日期是：%ld %ld %ld",year,month,day); if (isShowDay==YES) { [dateButton setTitle:[NSString stringWithFormat:@"%ld年 %ld月 %ld日",year,month,day] forState:UIControlStateNormal]; }else{ [dateButton setTitle:[NSString stringWithFormat:@"%ld年 %ld月",year,month] forState:UIControlStateNormal]; }}-(void)pickerArea:(WXZPickAreaView *)pickerArea selectProvince:(NSString *)province selectCity:(NSString *)city{ NSLog(@"省市的选择%@ %@",province,city); [selectAreabutton setTitle:[NSString stringWithFormat:@"%@%@",province,city] forState:UIControlStateNormal];}-(void)customPickView:(WXZCustomPickView *)customPickView selectedTitle:(NSString *)selectedTitle{ NSLog(@"选择%@",selectedTitle); [singlePickViewSelectButton setTitle:selectedTitle forState:UIControlStateNormal];}-(void)pickerTimeView:(WXZPickTimeView *)pickerTimeView selectHour:(NSInteger)hour selectMinute:(NSInteger)minute{ NSLog(@"选择的时间：%ld %ld",hour,minute); [selectTimeButton setTitle:[NSString stringWithFormat:@"%ld时 %ld分",hour,minute] forState:UIControlStateNormal];}最后，看看效果图：
有需要的可以下载demo看看
github地址：https://github.com/wxzwork/CustomPickView
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持VEVB武林网。
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