iOS pickerView（所有类型一网打尽）

小鱼儿 2022-05-31 11:17 146阅读 0赞

# 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][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][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

+ (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。

#### 三、运行效果 ####

1，单数组pick运行图

![Simulator Screen Shot 2017年8月7日 18.04.28.png][Simulator Screen Shot 2017_8_7_ 18.04.28.png]

2，多数组pick：（可以在顶部添加数据类型）

![Simulator Screen Shot 2017年8月7日 18.04.31.png][Simulator Screen Shot 2017_8_7_ 18.04.31.png]

3，地址选择pick：

![Simulator Screen Shot 2017年8月7日 18.04.34.png][Simulator Screen Shot 2017_8_7_ 18.04.34.png]

4，日期pick选择：

![Simulator Screen Shot 2017年8月7日 18.04.36.png][Simulator Screen Shot 2017_8_7_ 18.04.36.png]

时间是从我们选择的当天开始；

#### 四、其他补充 ####

1、最近在封装一些大家常用控件，希望大家支持；

#### 代码下载：[http://www.demodashi.com/demo/11017.html][http_www.demodashi.com_demo_11017.html] ####

#### 注：本文著作权归作者，由demo大师发表，拒绝转载，转载需要作者授权 ####

[http_www.demodashi.com_demo_11017.html]: http://www.demodashi.com/demo/11017.html
[2017-08-07 17.59.21.png]: /images/20220531/e6c0e6a926c54ea0a2e11598a9d824b8.png
[iOS]: http://lib.csdn.net/base/1
[Simulator Screen Shot 2017_8_7_ 18.04.28.png]: /images/20220531/354b7635fa694552a5193cb21309c947.png
[Simulator Screen Shot 2017_8_7_ 18.04.31.png]: /images/20220531/f4ce567990c041f0ab6ae1c94082fb04.png
[Simulator Screen Shot 2017_8_7_ 18.04.34.png]: /images/20220531/7834b686aadd46999cf3f904eea63617.png
[Simulator Screen Shot 2017_8_7_ 18.04.36.png]: /images/20220531/346dfe1189af414a88732cd6b8b43f39.png