点击 UITextField 跳出 UIDatePicker 以选取日期 (生日，NSDate)

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首先添加一个 UITextField。

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_brithdayTextField = [[UITextField alloc] initWithFrame:CGRectMake(birthdayLabelX + birthdayLabelWidth + 10.0,
                                                                      birthdayLabelY,
                                                                      textFieldWidth,
                                                                      textFieldHeight)];
_brithdayTextField.text = [NSString stringWithFormat:@"%@",[_userinfo valueForKey:@"birthday"]];
_brithdayTextField.textAlignment = NSTextAlignmentLeft;
_brithdayTextField.backgroundColor = textFieldDebugColor;
_brithdayTextField.delegate = self;
_brithdayTextField.tag = 10008;
_brithdayTextField.returnKeyType = UIReturnKeyNext;
[_scrollView addSubview:_brithdayTextField];

其次，实现 UITextFieldDelegate 的代理方法，在 -(void) textFieldDidBeginEditing:(UITextField *)textField 方法中实现

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if ([_brithdayTextField isFirstResponder])
{
    // 建立 UIDatePicker
    _datePicker = [[UIDatePicker alloc]init];
    _datelocale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
    _datePicker.locale = _datelocale;
    _datePicker.timeZone = [NSTimeZone timeZoneWithName:@"GMT"];
    _datePicker.datePickerMode = UIDatePickerModeDate;
    _brithdayTextField.inputView = _datePicker;
    
    // 建立 UIToolbar
    UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 44)];
    UIBarButtonItem *right = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                          target:self
                                                                          action:@selector(cancelPicker)];
    UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                                                           target:nil
                                                                           action:nil];
    toolBar.items = [NSArray arrayWithObjects:space,right,nil];
    _brithdayTextField.inputAccessoryView = toolBar;
}

最后在完成选取的时候，进行下面的操作

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-(void) cancelPicker {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd"];
    _brithdayTextField.text = [NSString stringWithFormat:@"%@",[formatter stringFromDate:_datePicker.date]];
    CGRect frame =  _scrollView.frame;
    frame.size.height = [[UIScreen mainScreen] bounds].size.height;
    frame.origin.y = 0.0;
    _scrollView.frame=frame;
    [_brithdayTextField resignFirstResponder];
}

参考文章

http://blog.hsin.tw/2013/ios-dev-tap-uitextfield-popup-uidatepicker-to-pick-date/