iOS自定义UIDatePicker日期选择器视图 ，首先看一下效果图：

下面贴上相关代码：

ViewController：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#import "ViewController.h"
#import "HWDatePicker.h"

#define mainW [UIScreen mainScreen].bounds.size.width
#define mainH [UIScreen mainScreen].bounds.size.height

@interface ViewController ()<UITextFieldDelegate,HWDatePickerDelegate>

@property (nonatomic,weak) HWDatePicker *datePicker;
@property (nonatomic,strong) UITextField *dateTextField;

@end

@implementation ViewController

- (void)viewDidLoad {
 [super viewDidLoad];

 self.view.backgroundColor = [UIColor blackColor];

 //创建控件
 [self creatControl];
}

- (void)creatControl
{
 //textField
 _dateTextField = [[UITextField alloc] initWithFrame:CGRectMake(mainW * 0.05,mainW * 0.72,mainW * 0.9,mainW * 0.12)];
 _dateTextField.background = [UIImage imageNamed:@"textFieldBj"];
 _dateTextField.textAlignment = NSTextAlignmentRight;
 _dateTextField.placeholder = @"请设置日期";
 _dateTextField.delegate = self;
 UILabel *lab2 = [[UILabel alloc] initWithFrame:CGRectMake(0,mainW * 0.4,mainW * 0.12)];
 lab2.textAlignment = NSTextAlignmentLeft;
 lab2.text = @" 日期";
 lab2.textColor = [UIColor grayColor];
 _dateTextField.leftView = lab2;
 _dateTextField.leftviewmode = UITextFieldviewmodeAlways;
 UILabel *lab22 = [[UILabel alloc] initWithFrame:CGRectMake(mainW * 0.12 - 15,15,mainW * 0.12)];
 _dateTextField.rightView = lab22;
 _dateTextField.rightviewmode = UITextFieldviewmodeAlways;
 [self.view addSubview:_dateTextField];

 //日期选择器
 HWDatePicker *datePicker = [[HWDatePicker alloc] initWithFrame:CGRectMake(mainW * 0.05,mainH,mainW * 0.5)];
 datePicker.delegate = self;
 [self.view addSubview:datePicker];
 self.datePicker = datePicker;
}

#pragma mark - UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
 if (_datePicker.frame.origin.y != mainH && _datePicker != nil) {
  [_datePicker dismiss];
  return NO;

 }else if (textField == _dateTextField) {
  [_datePicker show];
  return NO;
 }

 return YES;
}

#pragma mark - HWDatePickerDelegate
- (void)datePickerView:(HWDatePicker *)datePickerView didClickSureBtnWithSelectDate:(NSString *)date
{
 _dateTextField.text = date;
}

@end

HWDatePicker：

#import <UIKit/UIKit.h>

@class HWDatePicker;

@protocol HWDatePickerDelegate <NSObject>

/**
 * HWDatePicker确定按钮点击代理事件
 *
 * @param datePickerView HWDatePicker
 * @param date   选中的日期
 */
- (void)datePickerView:(HWDatePicker *)datePickerView didClickSureBtnWithSelectDate:(NSString *)date;

@end

@interface HWDatePicker : UIView

@property (nonatomic,weak) id<HWDatePickerDelegate> delegate;

- (void)show;
- (void)dismiss;

@end

#import "HWDatePicker.h"

//获得屏幕的宽高
#define mainW [UIScreen mainScreen].bounds.size.width
#define mainH [UIScreen mainScreen].bounds.size.height

@interface HWDatePicker ()

@property (nonatomic,strong) UIDatePicker *datePicker;

@end

@implementation HWDatePicker

- (id)initWithFrame:(CGRect)frame
{
 if (self = [super initWithFrame:frame]) {
  //背景框
  UIImageView *back = [[UIImageView alloc] initWithFrame:CGRectMake(0,self.bounds.size.width,self.bounds.size.height)];
  back.image = [UIImage imageNamed:@"datePickerBj"];
  [self addSubview:back];

  //日期选择器
  _datePicker = [[UIDatePicker alloc] init];
  _datePicker.frame = CGRectMake(10,10,self.frame.size.width - 20,120);
  _datePicker.backgroundColor = [UIColor clearColor];
  [_datePicker setDatePickerMode:UIDatePickerModeDate];
  NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
  _datePicker.locale = locale;
  NSDateFormatter *formatter_minDate = [[NSDateFormatter alloc] init];
  [formatter_minDate setDateFormat:@"yyyy-MM-dd"];
  NSDate *minDate = [formatter_minDate dateFromString:@"2008-01-01"];
  formatter_minDate = nil;
  [_datePicker setMinimumDate:minDate];
  [self addSubview:_datePicker];

  //确定按钮
  UIButton *sureBtn = [[UIButton alloc] initWithFrame:CGRectMake((self.frame.size.width - mainW * 0.36) * 0.5,self.frame.size.height * 0.747,mainW * 0.36,mainW * 0.11)];
  [sureBtn setImage:[UIImage imageNamed:@"sureBtn"] forState:UIControlStateNormal];
  [sureBtn addTarget:self action:@selector(sureBtnOnClick) forControlEvents:UIControlEventTouchUpInside];
  [self addSubview:sureBtn];
 }

 return self;
}

- (void)sureBtnOnClick
{
 [self dismiss];

 if (_delegate && [_delegate respondsToSelector:@selector(datePickerView:didClickSureBtnWithSelectDate:)]) {
  [_delegate datePickerView:self didClickSureBtnWithSelectDate:[self getDateString]];
 }
}

- (NSString *)getDateString
{
 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 [dateFormatter setDateFormat:@"yyyy-MM-dd"];
 NSString *date = [dateFormatter stringFromDate:[self.datePicker date]];

 return date;
}

- (void)show
{
 [UIView animateWithDuration:0.3 animations:^{
  self.frame = CGRectMake(mainW * 0.05,mainH - mainW * 0.75,mainW * 0.5);
 }];
}

- (void)dismiss
{
 [UIView animateWithDuration:0.3 animations:^{
  self.frame = CGRectMake(mainW * 0.05,mainW * 0.5);
 }];
}

@end

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