为什么我的UITableView尝试加载时出现无法出队的错误? [英] Why am I getting an error about being unable to dequeue when my UITableView tries to load?
问题描述
我收到以下错误:
* 由于未捕获的异常'NSInternalInconsistencyException'而终止应用,原因:'无法使用标识符FontCell将单元格
出列 - 必须为
标识符注册一个nib或类,或者在故事板中连接原型单元'
我不确定我到底做错了什么。我设置了单元格标识符(以编程方式,因为它不是通过Interface Builder创建的)并执行我认为我应该在委托方法中执行的所有操作,但是当我尝试加载UITableView时,我仍然会收到该错误。 / p>
以下是相关代码(值得注意的是我已将UITableViewCell子类化为自定义选项):
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.fonts.count;
}
- (的UITableViewCell *)的tableView:(UITableView的*)的tableView的cellForRowAtIndexPath:(NSIndexPath *)indexPath {
静态的NSString * cellIdentifier = @ FontCell;
FontCell * cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if(!cell){
cell = [[FontCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@FontCell];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
int row = indexPath.row;
cell.fontFamilyLabel.text = self.fonts [row];
返回单元格;
}
这是我在子类UITableViewCell(FontCell)中更改的唯一方法:
- (ID)initWithStyle:(UITableViewCellStyle)样式reuseIdentifier:(的NSString *)reuseIdentifier
{
自= [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if(self){
self.fontFamilyLabel = [[UILabel alloc] initWithFrame:CGRectMake(5,5,200,20)];
self.fontFamilyLabel.textAlignment = NSTextAlignmentCenter;
[self.contentView addSubview:self.fontFamilyLabel];
}
返回自我;
}
我究竟做错了什么?
< DIV类= h2_lin>解决方案
最简单的解决方法是只将其更改为 FontCell *细胞= [的tableView dequeueReusableCellWithIdentifier:cellIdentifier];
如同您当前的代码,如果您执行此方法,则必须检查以确保 cell
不是 nil
。 / p>
或者,您可以注册 UINib
或表
在表级别与 @FontCell相关联
例如(在 viewDidLoad
中):
[self.tableView registerClass :[FontCell类] forCellReuseIdentifier:@FontCell];
然后你可以做到
FontCell * cell = [tableView dequeueReusableCellWithIdentifier:@FontCellforIndexPath:indexPath];
这种方法的好处是你知道你的手机永远不会 nil
,所以你可以马上开始修改它。
I get the following error:
* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier FontCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
I'm not sure exactly what I'm doing wrong. I set the cell identifier (programmatically, as it's not created through Interface Builder) and do everything I thought I was supposed to do in the delegate methods, but I'm still getting that error when I try to get the UITableView to load.
Here's the relevant code (it's worth noting I've subclassed UITableViewCell for customization options):
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.fonts.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = @"FontCell";
FontCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[FontCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"FontCell"];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
int row = indexPath.row;
cell.fontFamilyLabel.text = self.fonts[row];
return cell;
}
And here's the only method I changed in my subclassed UITableViewCell (FontCell):
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
self.fontFamilyLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 200, 20)];
self.fontFamilyLabel.textAlignment = NSTextAlignmentCenter;
[self.contentView addSubview:self.fontFamilyLabel];
}
return self;
}
What exactly am I doing wrong?
Easiest fix is to just change it to FontCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
As with your current code, you'll have to check to be sure cell
is not nil
if you do this method.
Alternately, you can register a UINib
or Class
at the table level that is tied to @"FontCell"
For example (up in viewDidLoad
):
[self.tableView registerClass: [FontCell class] forCellReuseIdentifier:@"FontCell"];
Then you can do
FontCell *cell = [tableView dequeueReusableCellWithIdentifier:@"FontCell" forIndexPath:indexPath];
The nice thing with this method is that you know that your cell will never be nil
, so you can just immediately begin modifying it.
这篇关于为什么我的UITableView尝试加载时出现无法出队的错误?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!