xcode 自定义 UITableViewCell 不使用 .xib（很可能是因为 init 方法存在缺陷）
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Custom UITableViewCell Not Using .xib (Most Likely Because of Flaw in init Method)
提问by sinθ
I subclassed the UITableViewCell in order to customize it, but I think I'm missing something because: 1) It's not working and 2) There are a couple of things I'm confused on. Along with customizing the look of the .xib file, I also changed the backgroundView, and that part is working fine. The part that I least understand/am most confused about is the init method, so I posted that here. If it turns out that is correct, please tell me so I can post more code that maybe the cause.
我对 UITableViewCell 进行了子类化以对其进行自定义，但我认为我遗漏了一些东西，因为：1) 它不起作用 2) 有几件事我很困惑。除了自定义 .xib 文件的外观外，我还更改了 backgroundView，这部分工作正常。我最不了解/最困惑的部分是 init 方法，所以我把它贴在这里。如果事实证明这是正确的，请告诉我，以便我可以发布更多可能是原因的代码。
This is the init method, which I customized.I'm sort of confused around the "style" idea and I think I'm just returning a normal UITableViewCell with a different backgroundView. I mean, there's nothing in there that refers to the .xib or does anything but change the .backgroundView from the self:
这是我自定义的 init 方法。我对“风格”的想法有点困惑，我想我只是返回一个具有不同背景视图的普通 UITableViewCell。我的意思是，那里没有任何内容引用 .xib 或做任何事情，只是从 self 更改 .backgroundView：
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier wait: (float) wait fadeOut: (float) fadeOut fadeIn: (float) fadeIn playFor: (float) playFor
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
CueLoadingView* lview = [[CueLoadingView alloc] initWithFrame:CGRectMake(0, 0, 320, 53)];
self.backgroundView = lview;
[self setWait:wait]; // in turn edits the lview through the backgrounView pointer
[self setFadeOut:fadeOut];
[self setFadeIn:fadeIn];
[self setPlayFor:playFor];
}
return self;
}
Other than the .xib and several setters and getters, this is the only real part of my code, that relates to retrieving a cell.
除了 .xib 和几个 setter 和 getter，这是我代码中唯一与检索单元格相关的真实部分。
Additional Information:
附加信息：
1) This is my .xib, which is linked to the class.
1) 这是我的 .xib，它与课程相关联。
2) This is the code that calls/creates the UITableView (the delegate/view controller):
2）这是调用/创建 UITableView（委托/视图控制器）的代码：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"CueTableCell";
CueTableCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[CueTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier wait:5.0 fadeOut:1.0 fadeIn:1.0 playFor:10.0];
[cell updateBarAt:15];
}
return cell;
}
回答by Martin R
The easiest way (available since iOS 5.0) to create a custom table view cell in a nib file is to use registerNib:forCellReuseIdentifier:in the table view controller. The big advantage is that dequeueReusableCellWithIdentifier:then automatically instantiates a cell from the nib file if necessary. You don't need the if (cell == nil) ...part anymore.
在 nib 文件中创建自定义表格视图单元格的最简单方法（自 iOS 5.0 起可用）是registerNib:forCellReuseIdentifier:在表格视图控制器中使用。最大的优点是，dequeueReusableCellWithIdentifier:如果需要，然后从 nib 文件中自动实例化一个单元格。你不再需要这个if (cell == nil) ...部分了。
In viewDidLoadof the table view controller you add
在viewDidLoad您添加的表视图控制器中
[self.tableView registerNib:[UINib nibWithNibName:@"CueTableCell" bundle:nil] forCellReuseIdentifier:@"CueTableCell"];
and in cellForRowAtIndexPathyou just do
而在cellForRowAtIndexPath你只是做
CueTableCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CueTableCell"];
// setup cell
return cell;
Cells loaded from a nib file are instantiated using initWithCoder, you can override that in your subclass if necessary. For modifications to the UI elements, you should override awakeFromNib(don't forget to call "super").
从 nib 文件加载的单元格使用 实例化initWithCoder，如有必要，您可以在子类中覆盖它。对于 UI 元素的修改，您应该覆盖awakeFromNib（不要忘记调用“super”）。
回答by Mike D
You have to load the cell from the .xib instead:
您必须从 .xib 加载单元格：
if ( cell == nil ) {
cell = [[NSBundle mainBundle] loadNibNamed:@"CellXIBName" owner:nil options:nil][0];
}
// set the cell's properties
回答by Dipen Panchasara
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"CueTableCell";
CueTableCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
NSArray *array = [[NSBundle mainBundle] loadNibNamed:@"CueTableCell XibName" owner:self options:nil];
// Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).
cell = [array objectAtIndex:0];
}
return cell;
}
