概述

关于PickView的所有类型都在这里

详细

代码下载：

首先看下项目的整体结构：

屏幕快照 2017-08-07 17.59.21.png

一、准备工作

UIPickerView，即取值控件。而取值控件就行的下拉菜单，虽然在界面呈现方面它和所谓的下拉菜单并不同，不过对于使用的目的和场景确实相同的。UIPickerView直接继承自UIView，没有继承UIControl，因此，它并不能像UIControl那样绑定事件处理方法，UIPickerView的事件处理由其代理对象来完成。UIPickView和UITableView的使用过程较相似，都需要一个数据源对象和一个代理对象。

二、程序实现

(1)  - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView; 返回PickerView的列数(2)  - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;返回PickView的component列对应的行数(3)  - (nullableNSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component; 返回每一列每一行的内容(4)  - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component; 用户选中PickView的某一列和某一行时会调用该方法(5)  - (nullableNSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component修改PickView中component列row行的文本的样式(6)  - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view 该方法返回的UIView的控件将直接作为UIPickView对应的component 列row行的列表项(7)  - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component 设置component列对应的行高(8)  - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component该方法设置component列对应的宽度(9)  - (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated该方法设置选中的UIPickView 第component列row行项，最后一个参数animated代表是否要用到动画(10)  @property(nonatomic,readonly)NSInteger numberOfComponents;

获取UIPickerView指定列中包含的列表项的数量，该属性是只读的。

在项目中，我们是将toolBar与View分开设置的，我们可以随意设置，

对于单数组多数组地区的pickView 的话我们都是只需要设置view 添加数据等等，而对于日期，我对他进行了简单的处理日式的时间是从当前时间开始，减少用户的选择滑动

+ (NSDateComponents *)currentDateComponents{    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday;    return [calendar components:unitFlags fromDate:[NSDate date]];}+ (NSInteger)currentMonth{    return [NSCalendar currentDateComponents].month;}+ (NSInteger)currentYear{    return [NSCalendar currentDateComponents].year;}+ (NSInteger)currentDay{    return [NSCalendar currentDateComponents].day;}+ (NSInteger)currnentWeekday{    return [NSCalendar currentDateComponents].weekday;}+ (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;    }}+ (NSInteger)getFirstWeekdayWithYear:(NSInteger)year                               month:(NSInteger)month{    NSString *stringDate = [NSString stringWithFormat:@"%ld-%ld-01", (long)year, (long)month];    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];    [formatter setDateFormat:@"yy-MM-dd"];    NSDate *date = [formatter dateFromString:stringDate];        NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    NSDateComponents *components = [gregorian components:(NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSCalendarUnitWeekday) fromDate:date];    return [components weekday];}+ (NSComparisonResult)compareWithComponentsOne:(NSDateComponents *)componentsOne                                 componentsTwo:(NSDateComponents *)componentsTwo{    if (componentsOne.year == componentsTwo.year &&        componentsOne.month == componentsTwo.month &&        componentsOne.day   == componentsTwo.day) {        return NSOrderedSame;    }else if (componentsOne.year < componentsTwo.year ||              (componentsOne.year == componentsTwo.year && componentsOne.month < componentsTwo.month) ||              (componentsOne.year == componentsTwo.year && componentsOne.month == componentsTwo.month && componentsOne.day < componentsTwo.day)) {        return NSOrderedAscending;    }else {        return NSOrderedDescending;    }}+ (NSMutableArray *)arrayComponentsWithComponentsOne:(NSDateComponents *)componentsOne                                       componentsTwo:(NSDateComponents *)componentsTwo{    NSMutableArray *arrayComponents = [NSMutableArray array];        NSString *stringOne = [NSString stringWithFormat:@"%ld-%ld-%ld", componentsOne.year,                           componentsOne.month,                           componentsOne.day];    NSString *stringTwo = [NSString stringWithFormat:@"%ld-%ld-%ld", componentsTwo.year,                           componentsTwo.month,                           componentsTwo.day];    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];    [dateFormatter setDateFormat:@"yy-MM-dd"];        NSDate *dateFromString = [dateFormatter dateFromString:stringOne];    NSDate *dateToString = [dateFormatter dateFromString:stringTwo];    int timediff = [dateToString timeIntervalSince1970]-[dateFromString timeIntervalSince1970];        NSTimeInterval timeInterval = [dateFromString timeIntervalSinceDate:dateFromString];        for (int i = 0; i <= timediff; i+=86400) {        timeInterval = i;        NSDate *date = [dateFromString dateByAddingTimeInterval:timeInterval];                NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];        NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday;        [arrayComponents addObject:[calendar components:unitFlags fromDate:date]];    }    return arrayComponents;}+ (NSDateComponents *)dateComponentsWithString:(NSString *)String{    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];    [formatter setDateFormat:@"yy-MM-dd"];    NSDate *date = [formatter dateFromString:String];        NSCalendar *calendar = [NSCalendar currentCalendar];    NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday;    return  [calendar components:unitFlags fromDate:date];}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{        NSString *text;    if (component == 0) {        text =  [NSString stringWithFormat:@"%ld",row + 1900];    }else if (component == 1){        text =  [NSString stringWithFormat:@"%ld", row + 1];    }else{        text = [NSString stringWithFormat:@"%ld", row + 1];    }

所有的类型我都是对其用代理处理，我们只需要再需要使用的控制其中添加数据就好，

NSMutableArray *arrayData = [NSMutableArray array];        for (int i = 150; i < 220; i++) {            NSString *string = [NSString stringWithFormat:@"%d", i];            [arrayData addObject:string];        }        GZSinglePicker *sing = [[GZSinglePicker alloc]init];        [sing setArrayData:arrayData];        [sing setTitle:@"请选择身高"];        [sing setTitleUnit:@""];        [sing setDelegate:self];        [sing show];

我们可以对标题进行自定义，选择的东西会实时显示在顶部。