Objective c 格式化时间日期选择器并在文本字段中显示时间

我试图在文本字段中的日期选择器中显示时间。我已经走了这么远

UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(112, 88, 97, 30)];
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
textField.text=[NSString stringWithFormat:@"%@",[NSDate //what do I put here to put the datepicker time in the textfield]];
[self.view addSubview:textField];

UIDatePicker *datePicker = [[UIDatePicker alloc] init];
datePicker.datePickerMode = UIDatePickerModeDate;
[datePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
datePicker.timeZone = [NSTimeZone defaultTimeZone];
datePicker.minuteInterval = 5;
datePicker.datePickerMode = UIDatePickerModeTime;

[textField setInputView:datePicker];

编辑

我没有任何变化，但在这里

-(void)datePickerValueChanged:(id)sender{


}

---

使用

NSDateFormatter

的

stringFromDate:

方法如下：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle: NSDateFormatterShortStyle]; //Choose the appropriate style for your case
textField.text = [dateFormatter stringFromDate:datePicker.date];

---

您可以找到

NSDateFormatter

的文档，使用

NSDateFormatter

的

stringFromDate:

方法如下：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle: NSDateFormatterShortStyle]; //Choose the appropriate style for your case
textField.text = [dateFormatter stringFromDate:datePicker.date];

---

您可以找到

NSDateFormatter

.h文件的文档

@interface ViewController : UIViewController {
    UITextField *textField;
    UIDatePicker *dpDatePicker;
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];

    textField = [[UITextField alloc] initWithFrame:CGRectMake(112, 88, 250, 30)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    [self.view addSubview:textField];

    dpDatePicker = [[UIDatePicker alloc] init];
    dpDatePicker.datePickerMode = UIDatePickerModeDate;
    [dpDatePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
    dpDatePicker.timeZone = [NSTimeZone defaultTimeZone];
    dpDatePicker.minuteInterval = 5;

    [textField setInputView:dpDatePicker];
}

.m文件

@interface ViewController : UIViewController {
    UITextField *textField;
    UIDatePicker *dpDatePicker;
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];

    textField = [[UITextField alloc] initWithFrame:CGRectMake(112, 88, 250, 30)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    [self.view addSubview:textField];

    dpDatePicker = [[UIDatePicker alloc] init];
    dpDatePicker.datePickerMode = UIDatePickerModeDate;
    [dpDatePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
    dpDatePicker.timeZone = [NSTimeZone defaultTimeZone];
    dpDatePicker.minuteInterval = 5;

    [textField setInputView:dpDatePicker];
}

设置日期选择器值更改方法以显示用户选择的值。

- (void)datePickerValueChanged:(id)sender {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"h:mm a"];
    textField.text = [dateFormatter stringFromDate:dpDatePicker.date];
}

---

.h文件

@interface ViewController : UIViewController {
    UITextField *textField;
    UIDatePicker *dpDatePicker;
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];

    textField = [[UITextField alloc] initWithFrame:CGRectMake(112, 88, 250, 30)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    [self.view addSubview:textField];

    dpDatePicker = [[UIDatePicker alloc] init];
    dpDatePicker.datePickerMode = UIDatePickerModeDate;
    [dpDatePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
    dpDatePicker.timeZone = [NSTimeZone defaultTimeZone];
    dpDatePicker.minuteInterval = 5;

    [textField setInputView:dpDatePicker];
}

.m文件

@interface ViewController : UIViewController {
    UITextField *textField;
    UIDatePicker *dpDatePicker;
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];

    textField = [[UITextField alloc] initWithFrame:CGRectMake(112, 88, 250, 30)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    [self.view addSubview:textField];

    dpDatePicker = [[UIDatePicker alloc] init];
    dpDatePicker.datePickerMode = UIDatePickerModeDate;
    [dpDatePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
    dpDatePicker.timeZone = [NSTimeZone defaultTimeZone];
    dpDatePicker.minuteInterval = 5;

    [textField setInputView:dpDatePicker];
}

设置日期选择器值更改方法以显示用户选择的值。

- (void)datePickerValueChanged:(id)sender {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"h:mm a"];
    textField.text = [dateFormatter stringFromDate:dpDatePicker.date];
}

---

我试过了，文本字段没有改变。是否有一种方法需要更新文本字段？将上述代码放入

datePickerValueChanged:

方法中。您需要将您的

textField

设置为属性。我尝试了此操作，但textField没有更改。是否有一种方法需要更新文本字段？将上述代码放入

datePickerValueChanged:

方法中。您需要将您的

textField

设置为属性。您可以显示

datePickerValueChanged

方法吗？问题中更新为吗？您可以显示

datePickerValueChanged

方法吗？问题中更新为吗