如何在ios中准备UIPickerView数月和数年？

Question

我正在努力在iOS中准备带有月份和年份的UIPickerView。

以下是我的代码。

viewdidload 中的

：

//Array for picker view
monthsArray=[[NSMutableArray alloc]initWithObjects:@"Jan",@"Feb",@"Mar",@"Apr",@"May",@"Jun",@"Jul",@"Aug",@"Sep",@"Oct",@"Nov",@"Dec",nil];


NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy"];
NSString *yearString = [formatter stringFromDate:[NSDate date]];


yearsArray=[[NSMutableArray alloc]init];


for (int i=0; i<13; i++)
{
    [yearsArray addObject:[NSString stringWithFormat:@"%d",[yearString intValue]+i]];
}

myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 320, 200)];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[myPickerView selectRow:0 inComponent:0 animated:YES];
[self.view addSubview:myPickerView];

Picker视图委托方法：

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}

// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
NSInteger rowsInComponent;
if (component==0)
{
    rowsInComponent=[monthsArray count];
}
else
{
    rowsInComponent=[yearsArray count];
}
return rowsInComponent;
}



- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

NSString * nameInRow;
if (component==0)
{
    nameInRow=[monthsArray objectAtIndex:row];
}
else  if (component==1)
{
    nameInRow=[yearsArray objectAtIndex:row];
}

return nameInRow;
}


// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
CGFloat componentWidth ;

if (component==0)
{
    componentWidth = 100;
}
else  {
    componentWidth = 100;
}

return componentWidth;
}

我得到了以下输出：

但在本年度，1月至10月的月份已经过期。如何动态地在我的选择器中禁用那些年份。这几个月应该可用于剩余的几年。

实际上，实际输出是，

在上面，应该在UI中禁用当前年份的过期月份。

我们将不胜感激任何意见或建议。

提前谢谢。

Answer 1

在最后，我写了我的逻辑来实现它。

但是可能有更好的逻辑方法来优化内存。

以下是我的代码。

在viewdidload中：

 currentDateComponents = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate date]];

//Array for picker view
monthsArray=[[NSMutableArray alloc]initWithObjects:@"Jan",@"Feb",@"Mar",@"Apr",@"May",@"Jun",@"Jul",@"Aug",@"Sep",@"Oct",@"Nov",@"Dec",nil];
yearsArray=[[NSMutableArray alloc]init];


for (int i=0; i<13; i++)
{
    [yearsArray addObject:[NSString stringWithFormat:@"%d",[yearString intValue]+i]];
}

myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 320, 200)];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[myPickerView selectRow:[currentDateComponents month]-1 inComponent:0 animated:YES];
[self.view addSubview:myPickerView];

Picker视图委托方法：

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}

// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
NSInteger rowsInComponent;
if (component==0)
{
    rowsInComponent=[monthsArray count];
}
else
{
    rowsInComponent=[yearsArray count];
}
return rowsInComponent;
}



- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSLog(@"[currentDateComponents month]-->%d<--",[currentDateComponents month]);
    NSLog(@"-->%d<--",row);
    NSLog(@"row->%@<--",[yearsArray objectAtIndex:row]);
    NSLog(@"-->%@<--",[yearsArray objectAtIndex:[pickerView selectedRowInComponent:1]]);

    if ([pickerView selectedRowInComponent:0]+1<[currentDateComponents month] && [[yearsArray objectAtIndex:[pickerView selectedRowInComponent:1]] intValue]==[currentDateComponents year])
    {
        [pickerView selectRow:[currentDateComponents month]-1 inComponent:0 animated:YES];

                NSLog(@"Need to shift");
    }

if (component==1)
{
    [pickerView reloadComponent:0];
}

}


- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 44)];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blackColor];
label.font = [UIFont fontWithName:@"Arial-BoldMT" size:17];
label.text = component==0?[monthsArray objectAtIndex:row]:[yearsArray objectAtIndex:row];

if (component==0)
{
    if (row+1<[currentDateComponents month] && [[yearsArray objectAtIndex:[pickerView selectedRowInComponent:1]] intValue]==[currentDateComponents year])
    {
        label.textColor = [UIColor grayColor];
    }
}
return label;
}
// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
CGFloat componentWidth ;

if (component==0)
{
    componentWidth = 100;
}
else  {
    componentWidth = 100;
}

return componentWidth;
}

这是我的输出

2013年：

其他年份：

。 感谢您的贡献。

Answer 2

如果您的问题提及date and year，那么UIDatePickerModeDate似乎就足够了。

您正在寻找month and year这不是一个可用的选项。我建议你考虑使用双组件UIPickerView对象。

原始答案

您可以通过在右侧栏（Cmd + Option + 4）的“属性”检查器中将Mode property下的Date Picker更改为日期来执行此操作。您也可以通过编程方式执行此操作，

  datePicker.datePickerMode = UIDatePickerModeDate;

  

<强> UIDatePickerModeDate

The date picker displays months, days of the month, and years. The exact order of these items depends on the locale setting. An example of this mode is [ November | 15 | 2007 ]. 
Available in iOS 2.0 and later.

Declared in UIDatePicker.h.

Answer 3

您可以使用UIDatePickerView，然后您可以指定从IB显示的格式。

Answer 4

使用UIDatePicker apple reference和apple有一个非常好的示例代码也可以使用uidatepicker DateCell

Answer 5

我还建议你改用UIDatePicker。那将是一个更好的选择。

Answer 6

如果您不喜欢使用UIDatepicker，那么您可以尝试这个仅显示月份和年份的UIComponent（由我创建）：

MonthSelector