UIPickerView 释放后回到第 0 行

Question

我将 UIPickerView 添加到 UITableViewCell。我正在向其中添加大约 5 个条目。现在，当我尝试 select 一个值时，会使用正确的行调用 - (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 函数。但是在屏幕上 UIPickerView "scrolls" 回到第一个元素并且不坚持 selected 值。

有人遇到同样的问题吗？

EventSelectCell.h

@class EventSelectCell;

@protocol EventSelectCellDelegate <NSObject>

   - (void)selectedEvent:(Event*)selectedEvent;

@end

@interface EventSelectCell : UITableViewCell <UIPickerViewDataSource, UIPickerViewDelegate>

   @property (strong, nonatomic) id <EventSelectCellDelegate> delegate;

   @property (weak, nonatomic) IBOutlet UIPickerView *selectWheel;

@end

EventSelectCell.m

#import "EventSelectCell.h"

@implementation EventSelectCell
{
    EventManager* eventManager;
    NSArray* listOfEvents;
}

- (void)awakeFromNib {
    self.selectWheel.delegate = self;
    self.selectWheel.dataSource = self;

    // get the EventManger
    eventManager = [EventManager sharedEventManager];

    listOfEvents = [eventManager getListOfEvents];

    [self.selectWheel reloadAllComponents];
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {

    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {

    return [listOfEvents count];
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    Event* selectedEvent = [listOfEvents objectAtIndex:row];

    return [selectedEvent name];
}

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    Event* selectedEvent = [listOfEvents objectAtIndex:row];

    [self.delegate selectedEvent:selectedEvent];
}

@end

代表

- (void)selectedEvent:(Event*)selectedEvent {
    [playersInGame removeAllObjects];

    [playersInGame addObjectsFromArray:[self.eventManager getPlayersInEvent:selectedEvent onlyActive:YES]];

    [selectedEvent setIsActive:[NSNumber numberWithInt:1]];

    activeEvent = selectedEvent;

    [self.tableView reloadData];
}

Answer 1

好的，我找到问题了。 UIPickerView 在 UITableViewCell 中。每当有人使用我调用的 [self.tableView reloadData] 的 UIPickerView 选择某些内容时，这会导致 table 重新加载并再次初始化 UIPickerView。

现在我只是重新加载 table 中的单个部分。

UIPickerView 释放后回到第 0 行

UIPickerView goes back to row 0 when released

objective-c

uipickerview

ios