iOS pickerView（所有类型一网打尽）

概述

关于PickView的所有类型都在这里

详细

代码下载：http://www.demodashi.com/demo/11017.html

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iOS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

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+ (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];