Question

我有一个自定义单元格，当您选择一行时会显示一个pickerView。然后更改值并将其放在detailTextLabel上。但是这个方法在变化之前得到了值。

//Custom Cell


SimplePickerInputTableViewCell *cell = (SimplePickerInputTableViewCell *) [_tableView dequeueReusableCellWithIdentifier:cellIndentifier2];
                if (!cell) {
                    cell = [[SimplePickerInputTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellIndentifier2];
                    UIImageView *lineView2 = [[UIImageView alloc] initWithFrame:CGRectMake(-2, 45, 320, 10)];

                    lineView2.image = [UIImage imageNamed:@"linha_horizontal.png"];
                    [cell addSubview:lineView2];

                    _opcaoTitle = [[UILabel alloc] initWithFrame:CGRectMake(10, 15, 200, 20)];
                    _opcaoTitle.textAlignment = UITextAlignmentLeft;
                    _opcaoTitle.textColor = [UIColor blackColor];
                    _opcaoTitle.text = @"Pista - Feminino";
                    [cell addSubview:_opcaoTitle];

                    _opcaoValueF = [[UILabel alloc] initWithFrame:CGRectMake(180, 15, 100, 20)];
                    _opcaoValueF.textColor = [UIColor blackColor];
                    [cell addSubview:_opcaoValueF];

                }
                _opcaoValueF.text = [NSString stringWithFormat:@"R$ %@,00", _eventFemininoValue];

                cell.selectionStyle = UITableViewCellSelectionStyleGray;
                [cell setValue:@"0"];

                return cell;


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    [_tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSString *s = [[[tableView cellForRowAtIndexPath:indexPath] detailTextLabel] text];
    NSLog(@"String is: %@", s);

    int i = [s intValue];
    NSLog(@"This is the int value: %d", i);
}

SimplePicker.m

#import "SimplePickerInputTableViewCell.h"

@implementation SimplePickerInputTableViewCell

@synthesize delegate;
@synthesize value;

__strong NSArray *values = nil;

+ (void)initialize {
    values = [NSArray arrayWithObjects:@"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", nil];
}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
        self.picker.delegate = self;
        self.picker.dataSource = self;
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        // Initialization code
        self.picker.delegate = self;
        self.picker.dataSource = self;
    }
    return self;
}

- (void)setValue:(NSString *)v {

    value = v;
    self.detailTextLabel.text = value;
    self.detailTextLabel.textColor = [UIColor whiteColor];
    self.detailTextLabel.backgroundColor = [UIColor clearColor];
    if (![value isEqualToString:@"0"]) {
        [self.picker selectRow:[values indexOfObject:value] inComponent:0 animated:YES];
    }

    _backgroundValue = [[UIImageView alloc] initWithFrame:CGRectMake(285, 3, 40, 40)];
    _backgroundValue.image = [UIImage imageNamed:@"home_icon_popular.png"];
    [self addSubview:_backgroundValue];
    [self sendSubviewToBack:_backgroundValue];

   }



#pragma mark -
#pragma mark UIPickerViewDataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [values count];
}

#pragma mark -
#pragma mark UIPickerViewDelegate

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [values objectAtIndex:row];
}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
    return 44.0f;
}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
    return 300.0f; //pickerView.bounds.size.width - 20.0f;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    self.value = [values objectAtIndex:row];

    if (delegate && [delegate respondsToSelector:@selector(tableViewCell:didEndEditingWithValue:)]) {
        [delegate tableViewCell:self didEndEditingWithValue:self.value];
    }
}

Answer 1

问题是，一旦创建了新单元格，您就会获得该值（此时单元格可能甚至不在屏幕上绘制）。要解决此问题，您应该在使用时取消选择器视图时捕获该值。

根据您提供的其他代码

1）为表格视图单元格设置委托：

cell.delegate = self;

您可以在创建后立即执行此操作

2）添加tableViewCell:didEndEditingWithValue:

的实现

- (void)tableViewCell:(UITableViewCell*)cell didEndEditingWithValue:(NSValue*)value
{
    NSLog(@"Value is %@", value);
}

在PickerInputViewCell之后从detailTextLabel获取值

1 个答案: