今天写了一个自定义的pickerview,是关于时间选择的,先上图,有兴趣的朋友可以看看.

先创建一个model.

#import <Foundation/Foundation.h>
@interface KKDatePickerViewModel : NSObject
@property (nonatomic,copy)NSString *year;
@property (nonatomic,copy)NSString *moth;
@property (nonatomic,copy)NSString *day;
@end```
这个model就是用于记录当前选择的年月日.
然后是自定义pickerview.
#####KKDatePickerView.h

import <UIKit/UIKit.h>

import "KKDatePickerViewModel.h"

@interface KKDatePickerView : UIView
@property (strong, nonatomic) UIPickerView *pickerView;
@property (nonatomic, strong)KKDatePickerViewModel *model ;
-(instancetype)initWithFrame:(CGRect)frame;
@end

#####KKDatePickerView.m

import "KKDatePickerView.h"

@interface KKDatePickerView ()<UIPickerViewDataSource,UIPickerViewDelegate>
{
NSMutableArray *_yearArray;
NSMutableArray *_mothArray;
NSMutableArray *_dayArray ;
UIView *_view;
}

@end

@implementation KKDatePickerView

-(instancetype)initWithFrame:(CGRect)frame{

if (self=[super initWithFrame:frame]) {
    self.backgroundColor = [UIColor whiteColor];
    
    [self initData];
    [self initView];
}
return self;

}
//得到年月日这些数组
-(void)initData{

NSArray *array = [self getSystemTime];
self.model = [[KKDatePickerViewModel alloc] init];
self.model.year = array[0];
self.model.moth = array[1];
self.model.day = array[2];

_yearArray = [NSMutableArray array];
NSString *yearSystem = array[0];
int yearCount = [yearSystem intValue];
for (int i = 1900; i<yearCount+1; i++) {
    NSString *year = [NSString stringWithFormat:@"%.2d",i];
    [_yearArray addObject:year];
}
_mothArray = [NSMutableArray array];
for (int i = 1; i<13; i++) {
    NSString *moth = [NSString stringWithFormat:@"%.2d",i];
    [_mothArray addObject:moth];
}

[self getDaysInMoth:[self.model.moth integerValue]];

}
//初始化pickerview
-(void)initView{

UILabel * titleLab = [[UILabel alloc] initWithFrame:CGRectMake(0, 10, self.bounds.size.width, 25)];
titleLab.text = @"选择时间";
titleLab.textAlignment = NSTextAlignmentCenter;
titleLab.font = [UIFont systemFontOfSize:14];
titleLab.textColor = [UIColor colorWithRed:107/255.f green:107/255.f blue:107/255.f alpha:1];
[self addSubview:titleLab];

_pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(25, 35, self.bounds.size.width-50, 80)];
_pickerView.backgroundColor = [UIColor clearColor];

_pickerView.delegate = self;
_pickerView.dataSource = self;

NSArray *array = [self getSystemTime];
NSString  *yearRow = array[0] ;
int year = [yearRow intValue]-1900;

NSString *mothStr = array[1];
int moth = [mothStr intValue];

NSString *dayStr = array[2];
int day = [dayStr intValue];


//  设置默认选中日期,即现在的日期
[self.pickerView selectRow:year inComponent:0 animated:YES];
[self.pickerView selectRow:(moth-1) inComponent:1 animated:YES];
[self.pickerView selectRow:(day-1) inComponent:2 animated:YES];

[self performSelector:@selector(selectSystemTime)  withObject:nil afterDelay:.1];
[self clearSeparatorWithView:_pickerView];

//_pickerview的背景色为透明,在选中的那行上面放一层view,然后设置view的背景色
UIView * selectViewBac = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width-50, 20)];
selectViewBac.backgroundColor = [UIColor colorWithRed:226/255.f green:242/255.f blue:250/255.f alpha:1];
selectViewBac.center = _pickerView.center;

[self addSubview:selectViewBac];
[self addSubview:self.pickerView];

UIColor * color = [UIColor colorWithRed:37/255.f green:162/255.f blue:219/255.f alpha:1];
UIButton * cancleBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, CGRectGetMaxY(_pickerView.frame)+10, 90, 30)];
[cancleBtn setTitle:@"取消" forState:0];
[cancleBtn setTitleColor:color forState:0];
cancleBtn.layer.cornerRadius = 4;
cancleBtn.titleLabel.font = [UIFont systemFontOfSize:14];
cancleBtn.layer.masksToBounds = YES;
cancleBtn.layer.borderColor = color.CGColor;
cancleBtn.layer.borderWidth = 1;
[self addSubview:cancleBtn];

UIButton * sureBtn = [[UIButton alloc] initWithFrame:CGRectMake(self.bounds.size.width -120, CGRectGetMaxY(_pickerView.frame) +10, 90, 30)];
[sureBtn setTitle:@"确定" forState:0];
sureBtn.titleLabel.font = [UIFont systemFontOfSize:14];
[sureBtn setTitleColor:[UIColor whiteColor] forState:0];
sureBtn.layer.cornerRadius = 4;
sureBtn.layer.masksToBounds = YES;
sureBtn.backgroundColor = color;
[self addSubview:sureBtn];

}

-(void)selectSystemTime{
NSArray *array = [self getSystemTime];
NSString *yearRow = array[0];
int year = [yearRow intValue]-1900;

NSString *mothStr = array[1];
int moth = [mothStr intValue];

NSString *dayStr = array[2];
int day = [dayStr intValue];
//得到选中的那个view,并获取到它上面的label,再改变label的字体颜色
UIView * yearview =  [_pickerView viewForRow:year forComponent:0];
UILabel * yearlabel = yearview.subviews.firstObject;
yearlabel.textColor =[UIColor colorWithRed:13/255.f green:152/255.f blue:215/255.f alpha:1];

UIView * mothview =  [_pickerView viewForRow:(moth-1) forComponent:1];
UILabel * mothlabel = mothview.subviews.firstObject;
mothlabel.textColor =[UIColor colorWithRed:13/255.f green:152/255.f blue:215/255.f alpha:1];

UIView * dayview =  [_pickerView viewForRow:(day-1) forComponent:2];
UILabel * daylabel = dayview.subviews.firstObject;
daylabel.textColor =[UIColor colorWithRed:13/255.f green:152/255.f blue:215/255.f alpha:1];

}

pragma mark pickerviewDelegate

//返回列数
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 3;
}
//返回每列行数
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component==0) {
return _yearArray.count;
} else if(component==1){

    return  _mothArray.count;
}
return _dayArray.count;

}
//每行高度

• (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
  return 20;
  }
  //每个item的宽度
• (CGFloat) pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
  if (component==0) {
  return (self.bounds.size.width-50)/3;
  } else if(component==1){
  return (self.bounds.size.width-50)/3;
  }
  return (self.bounds.size.width-50)/3;
  }

//改变选中那行的字体和颜色

• (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
  if (!view){
  view = [[UIView alloc]init];
  }
  UILabel *text = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, (self.bounds.size.width-50)/3, 20)];
  if (component == 2) {
  NSInteger selecrDay = [_pickerView selectedRowInComponent:component];
  if (selecrDay == row) {
  text.textColor = [UIColor colorWithRed:13/255.f green:152/255.f blue:215/255.f alpha:1];
  }
  }
  text.textAlignment = NSTextAlignmentCenter;
  if (component==0) {
  text.text = [_yearArray objectAtIndex:row];
  }
  if (component==1) {
  text.text = [_mothArray objectAtIndex:row];
  }
  if (component==2) {
  text.text = [_dayArray objectAtIndex:row];
  }
  [view addSubview:text];

  return view;
  }

//被选择的行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
//滑动月份时,更新日
if (component ==1) {
NSInteger moth = [_mothArray[row] integerValue];
[self getDaysInMoth:moth];
[_pickerView reloadComponent:2];

}

UIView * view =  [_pickerView viewForRow:row forComponent:component];
UILabel * label = view.subviews.firstObject;
label.textColor =[UIColor colorWithRed:13/255.f green:152/255.f blue:215/255.f alpha:1];
if (component==0) {
    self.model.year = [_yearArray objectAtIndex:row];
}

if (component==1) {
    self.model.moth = [_mothArray objectAtIndex:row];
}
if (component==2) {
    self.model.day = [_dayArray objectAtIndex:row];
}

}
//获取某个月的天数
-(void)getDaysInMoth:(NSInteger)moth{

int temp = 0;
if (moth ==2) {
    temp = 29;
}else if(moth == 1||moth == 3||moth == 5||moth == 7||moth == 8||moth == 10||moth == 12){
    temp = 31;
}else{
    temp = 30;
}
_dayArray = [NSMutableArray array];
for (int i = 1; i<=temp; i++) {
    NSString *day = [NSString stringWithFormat:@"%.2d",i];
    [_dayArray addObject:day];
}

}
//让分割线背景颜色为透明

• (void)clearSeparatorWithView:(UIView * )view
  {
  if(view.subviews != 0 )
  {
  //分割线很薄的😊
  if(view.bounds.size.height < 5)
  {
  view.backgroundColor = [UIColor clearColor];
  }

    [view.subviews enumerateObjectsUsingBlock:^( UIView *  obj, NSUInteger idx, BOOL *  stop) {
        [self clearSeparatorWithView:obj];
    }];
  

  }

}
// 获取系统时间
-(NSArray*)getSystemTime{

NSDate *date = [NSDate date];
NSTimeInterval  sec = [date timeIntervalSinceNow];
NSDate *currentDate = [[NSDate alloc]initWithTimeIntervalSinceNow:sec];
NSDateFormatter *df = [[NSDateFormatter alloc]init];
[df setDateFormat:@"yyyy-MM-dd"];
NSString *na = [df stringFromDate:currentDate];
return [na componentsSeparatedByString:@"-"];

}

@end

代码里面都写了关键的注释,希望能对大家有所帮助.好了,祝大家天天开心😄