以编程方式选择时 UITableViewCell 变黑 [英] UITableViewCell going black when selected programmatically

问题描述

我想知道为什么当我将 selected 属性设置为 ON 时，这段代码会给我黑色的 UITableViewCells.如果我这样做，单元格的内容会变成全黑，我不知道为什么.

这是代码

<代码>////TableViewAdapter.m//表视图扫描模式////由 Nick Overdijk 于 10 年 8 月 26 日创建.//版权所有 2010 Nick Overdijk.版权所有.//#import "TableViewAdapter.h"#import "Model.h"@implementation TableViewAdapter@合成模型；- (id) initWithModel: (Model*) 模型 {self = [超级初始化];如果(自我！=零){self->model = [模型保留];}回归自我；}- (无效)dealloc {【模型发布】；[超级dealloc];}- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {返回[[模型单元数据]计数]；}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {return [[[model cellData] objectAtIndex: section] count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {静态 NSString *CellIdentifier = nil;UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];如果(单元格 == 零){cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault重用Identifier:CellIdentifier] autorelease];}cell.textLabel.text = [[[model cellData] objectAtIndex: indexPath.section] objectAtIndex: indexPath.row];if(indexPath.row == [[model currentSelected] row] && indexPath.section == [[model currentSelected] section]){cell.selected = YES;} 别的 {cell.selected = NO;}返回单元格；}@结尾////RootViewController.m//表视图扫描模式////由 Nick Overdijk 于 10 年 8 月 24 日创建.//版权所有 Nick Overdijk 2010.保留所有权利.//#import "RootViewController.h"#import "Model.h"#import "TableViewAdapter.h"@implementation 根视图控制器#pragma mark -#pragma mark 视图生命周期- (void)viewDidLoad {模型 = [[模型分配] init];[模型 addObserver:selfforKeyPath:@"updatedIndexPaths"选项:NSKeyValueObservingOptionNew上下文:NULL];[模型开始选择旋转];适配器 = [[TableViewAdapter alloc] initWithModel: 模型];self.tableView.dataSource = 适配器；[超级viewDidLoad];}- (void)dealloc {【适配发布】；【模型发布】；[超级dealloc];}#pragma mark -#pragma mark KVO 更新- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {NSArray * reloadThis = [change objectForKey: NSKeyValueChangeNewKey];[self.tableView reloadRowsAtIndexPaths: reload这些 withRowAnimation: UITableViewRowAnimationFade];}#pragma mark -#pragma mark 表视图委托- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {}@结尾

如果您需要更多代码，请大喊.:)

非常感谢，尼克

解决方案

我遇到了同样的问题并通过将 cell.selected = YES 移动到 tableView:willDisplayCell:forRowAtIndexPath 代替.

我认为这可能与 UITableViewCell 文档底部关于需要使用 tableView:willDisplayCell:forRowAtIndexPath 更改背景颜色的注释有关(大概是 selected 设置背景颜色).

I was wondering why this code would give me black UITableViewCells when I set the selected property ON. If I do that, the content of the cell turns completely black, and I have no idea why.

Here's the code

//
//  TableViewAdapter.m
//  TableviewScanMode
//
//  Created by Nick Overdijk on 8/26/10.
//  Copyright 2010 Nick Overdijk. All rights reserved.
//

#import "TableViewAdapter.h"
#import "Model.h"

@implementation TableViewAdapter

@synthesize model;

- (id) initWithModel: (Model*) model {
    self = [super init];
    if(self != nil){
        self->model = [model retain];
    }

    return self;
}

- (void) dealloc {
    [model release];
    [super dealloc];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [[model cellData] count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [[[model cellData] objectAtIndex: section] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = nil;

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    cell.textLabel.text = [[[model cellData] objectAtIndex: indexPath.section] objectAtIndex: indexPath.row];

    if(indexPath.row == [[model currentSelected] row] && indexPath.section == [[model currentSelected] section]){
        cell.selected = YES;
    } else {
        cell.selected = NO;
    }

    return cell;
}

@end

//
//  RootViewController.m
//  TableviewScanMode
//
//  Created by Nick Overdijk on 8/24/10.
//  Copyright Nick Overdijk 2010. All rights reserved.
//

#import "RootViewController.h"
#import "Model.h"
#import "TableViewAdapter.h"


@implementation RootViewController


#pragma mark -
#pragma mark View lifecycle

- (void)viewDidLoad {
    model = [[Model alloc] init];
    [model addObserver:self
            forKeyPath:@"updatedIndexPaths"
               options:NSKeyValueObservingOptionNew
               context:NULL
     ];

    [model startSelectionRotation];

    adapter = [[TableViewAdapter alloc] initWithModel: model];
    self.tableView.dataSource = adapter;

    [super viewDidLoad];
}

- (void)dealloc {
    [adapter release];
    [model release];
    [super dealloc];
}

#pragma mark -
#pragma mark KVO updates
- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    NSArray * reloadThese = [change objectForKey: NSKeyValueChangeNewKey];
    [self.tableView reloadRowsAtIndexPaths: reloadThese withRowAnimation: UITableViewRowAnimationFade];
}

#pragma mark -
#pragma mark Table view delegate

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


@end

If you need more code, shout. :)

Many thanks in advance, Nick

解决方案

I was having the same problem and fixed it by moving the cell.selected = YES into tableView:willDisplayCell:forRowAtIndexPath instead.

I think it might be related to the note at the bottom of the UITableViewCell docs about changes to background color requiring use of tableView:willDisplayCell:forRowAtIndexPath (presumably selected sets the background color).

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