启动时加载最后选择的 UIPickerView

发布于 2025-01-07 06:07:37 字数 110 浏览 4 评论 0原文

我有一个 UIPickerView 来选择应该显示的 PDF。我想保存最后选择的组件，这样当我退出应用程序或重新启动设备时，它会自动显示最后选择的PDF。我有两个组件，所以我想知道如何完成......谢谢！

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莳間冲淡了誓言ζ 2025-01-14 06:07:37

您可以使用 selectedRowInComponent 将选定的行保存在 NSUserDefaults 中...
然后在呈现 picker 时使用 selectRow:inComponent:animated:

EDIT:

像这样保存。

int selectedRow = [picker selectedRowInComponent:componentNumber];

You can save the selected row in NSUserDefaults by using selectedRowInComponent...
And then while presenting the picker use selectRow:inComponent:animated:

EDIT:

Save like this.

int selectedRow = [picker selectedRowInComponent:componentNumber];

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痴者 2025-01-14 06:07:37

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{

    NSString *numberString = [array1 objectAtIndex:[_pickerView selectedRowInComponent:0]];
    NSString *letterString = [array2 objectAtIndex:[_pickerView selectedRowInComponent:1]];

    NSString *pathComponentString = [NSString stringWithFormat:@"Stundenplan_%@%@.pdf", numberString, letterString];
    stundenplan.scalesPageToFit = YES;
    [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:pathComponentString]]]];
    NSInteger selectedRow = [_pickerView selectedRowInComponent:component];
    NSString *key = [NSString stringWithFormat:@"%@", @"picker"];
    [[NSUserDefaults standardUserDefaults] setInteger:selectedRow forKey:key];

}

-(IBAction)showPicker:(id)sender
{

    [pickerView selectRow:[[[NSUserDefaults standardUserDefaults] objectForKey:@"picker"] intValue] inComponent:0 animated:NO];
    self.pickerView.hidden = NO;
    cancelbtn.enabled = NO;
    cancelbar.hidden = NO;

}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{

    NSString *numberString = [array1 objectAtIndex:[_pickerView selectedRowInComponent:0]];
    NSString *letterString = [array2 objectAtIndex:[_pickerView selectedRowInComponent:1]];

    NSString *pathComponentString = [NSString stringWithFormat:@"Stundenplan_%@%@.pdf", numberString, letterString];
    stundenplan.scalesPageToFit = YES;
    [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:pathComponentString]]]];
    NSInteger selectedRow = [_pickerView selectedRowInComponent:component];
    NSString *key = [NSString stringWithFormat:@"%@", @"picker"];
    [[NSUserDefaults standardUserDefaults] setInteger:selectedRow forKey:key];

}

-(IBAction)showPicker:(id)sender
{

    [pickerView selectRow:[[[NSUserDefaults standardUserDefaults] objectForKey:@"picker"] intValue] inComponent:0 animated:NO];
    self.pickerView.hidden = NO;
    cancelbtn.enabled = NO;
    cancelbar.hidden = NO;

}

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