Question

我有一个带有2个组件的UIPickerView。选择第一个组件将填充第二个组件。看起来像这样：

测试用例：

选择Component 0中的任意选项，然后选择Component 1选择器中的任何一集，然后点击隐藏选择器的Fitler。
再次显示选择器以选择其他内容。第一个组件正确加载。第二个组件是空白的，如截图：

以下是代码：

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
    UILabel* tView = (UILabel*)view;
    if (!tView){
        tView = [[UILabel alloc] init];
        tView.textAlignment = NSTextAlignmentCenter;
        // Setup label properties - frame, font, colors etc
        //...
        //adjustsFontSizeToFitWidth property to YES

        if(pickerView == self.seasonEpiPickerView && component == 1){
            tView.font= [UIFont systemFontOfSize:12];
            tView.adjustsFontSizeToFitWidth = YES;
        }
    }

    // Fill the label text here
     if (pickerView == self.seasonEpiPickerView)
    {
        if (component == 0) {
            if (row == 0) {
                item = @"All";
            } else {
                //NSLog(@"c1:%ld", (long)row);
                item = [NSString stringWithFormat:@"S%@", ((Season *)[self.media.seasonManager.seasonArray objectAtIndex:row-1]).seasonNr];
            }

        } else if (component == 1){
            if(self.media.seasonManager && self.media.seasonManager.seasonArray && [self.media.seasonManager.seasonArray count]>0 ) {
                Season* tempSeason = self.media.seasonManager.seasonArray[[self.seasonEpiPickerView selectedRowInComponent:0]-1];
                item = [NSString stringWithFormat:@"%@.%@ \"%@\"", tempSeason.seasonNr, [NSString stringWithFormat: @"%02d", [((Episode *)[tempSeason.episodeManager.episodeArray objectAtIndex:row]).episodeNr intValue]], ((Episode *)[tempSeason.episodeManager.episodeArray objectAtIndex:row]).title];
                NSLog(@"c2:%ld:%@", (long)row, item);
            }
        }
    }
    tView.text = item;

    return tView;
}

修改

以下是我在viewDidLoad

self.seasonPickerViewTextField  = [[UITextField alloc] initWithFrame:CGRectZero];
[self.view addSubview:self.seasonPickerViewTextField];

self.seasonEpiPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
self.seasonEpiPickerView.showsSelectionIndicator = YES;
self.seasonEpiPickerView.dataSource = self;
self.seasonEpiPickerView.delegate = self;

//add the toolbar for the season picker
UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,screenWidth,44)];
[toolBar setBarStyle:UIBarStyleBlack];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:@"Filter   " style:UIBarButtonItemStylePlain target:self action:@selector(filterByEpisode:)];
UIBarButtonItem *flexible = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
UIBarButtonItem *barCancelButton = [[UIBarButtonItem alloc] initWithTitle:@"   Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancelPicker:)];
toolBar.items = [NSArray arrayWithObjects: barCancelButton, flexible, barButtonDone, nil];
self.seasonPickerViewTextField.inputAccessoryView = toolBar;

// set change the inputView (default is keyboard) to UIPickerView
self.seasonPickerViewTextField.inputView = self.seasonEpiPickerView;

编辑2 在呈现选择器视图时执行延迟重新加载，第二次正确地重新加载第二个组件。这似乎非常强硬。

- (IBAction)pickEpisodeButton:(id)sender
{
    [self.seasonPickerViewTextField becomeFirstResponder];

    /* None of the following commented lines of code have any effect*/
    //[self.seasonEpiPickerView selectRow:1 inComponent:0 animated:NO];
    //[self.seasonEpiPickerView selectRow:selectedSeason inComponent:0 animated:YES];
    //[self.seasonEpiPickerView selectRow:selectedEpisode inComponent:1 animated:YES];
    //[self.seasonEpiPickerView reloadComponent:1];

    //set a 1.5 sec timer to go to the next screen
    [NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(loadSecondComponent) userInfo:nil repeats:NO];
}


-(void)loadSecondComponent {
    [self.seasonEpiPickerView reloadComponent:1];
}

UIPickerView第二个组件在第二次显示选择器视图时填充空白

0 个答案: