使用扩展类进行自定义时 UITableViewCell 出现问题
我有两个 UITableViewCell 类,它们显示不同的数据,但它们使用相同的表。
我试图通过使用 bool var 分两步填充表格,但似乎我遇到了异常,因为单元格获得了第一类分配并且无法变异...
基本上我必须将
@interface PatientsCellNewPager : UITableViewCell { }
@interface DoctorsCellNewPager : UITableViewCell { }
代码 扩展到单元格扩展类当我在步骤 2 并尝试更改单元格的类型时刹车,并在 [cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] ]; 处给出异常代码> 在 Phase==2 if 块上..
这是因为根据调试器的单元格仍然具有第一次初始化时的 DoctorsCellNewPager 类型....
否则我该怎么做? 它必须位于同一页面上,使用类的相同实例,但使用多个布局并定义单元格布局,这将是一个糟糕的选择,
这是我的代码
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
if (phase==2) { //patient
PatientsCellNewPager *cell =(PatientsCellNewPager *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[PatientsCellNewPager alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
PatientsSet *set = (PatientsSet *)[patients_set objectAtIndex:indexPath.row];
NSLog(@"logg %d",indexPath.row);
[cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] ];
return cell;
}
else if (phase==1) { //doctor
DoctorsCellNewPager *cell =(DoctorsCellNewPager *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[DoctorsCellNewPager alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// Set up the cell
DoctorsSet *set = (DoctorsSet *)[doctors_set objectAtIndex:indexPath.row];
[cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] pass:YES ];
return cell;
}
return nil;
}
,这是我的错误
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DoctorsCellNewPager setData:cellid:]: unrecognized selector sent to instance 0x181690'
*** Call stack at first throw:
(
0 CoreFoundation 0x323ef64f __exceptionPreprocess + 114
1 libobjc.A.dylib 0x36632c5d objc_exception_throw + 24
2 CoreFoundation 0x323f31bf -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x323f2649 ___forwarding___ + 508
I have 2 classes for a UITableViewCell that show different data but they use the same table.
I'm trying to populate the table in 2 steps by using a bool var, but it seems that I get an exception because the cell gains the first class assignment and can't mutate...
basicaly I have to cell extended classes
@interface PatientsCellNewPager : UITableViewCell { }
@interface DoctorsCellNewPager : UITableViewCell { }
the code brakes when I'm at step 2 and trying to change the type of the cell and gives an exception at [cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] ];
on the phase==2 if block..
this is because cell according to the debugger still has the type DoctorsCellNewPager from the first initialization....
How can I do it otherwise??
It has to be on the same page using the same instance of the class but using multiple layouts and defining the cell layout the spot ..would be a terrible option
here's my code
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
if (phase==2) { //patient
PatientsCellNewPager *cell =(PatientsCellNewPager *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[PatientsCellNewPager alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
PatientsSet *set = (PatientsSet *)[patients_set objectAtIndex:indexPath.row];
NSLog(@"logg %d",indexPath.row);
[cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] ];
return cell;
}
else if (phase==1) { //doctor
DoctorsCellNewPager *cell =(DoctorsCellNewPager *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[DoctorsCellNewPager alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// Set up the cell
DoctorsSet *set = (DoctorsSet *)[doctors_set objectAtIndex:indexPath.row];
[cell setData:set cellid:[NSString stringWithFormat:@"%d",indexPath.row] pass:YES ];
return cell;
}
return nil;
}
here's my error
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DoctorsCellNewPager setData:cellid:]: unrecognized selector sent to instance 0x181690'
*** Call stack at first throw:
(
0 CoreFoundation 0x323ef64f __exceptionPreprocess + 114
1 libobjc.A.dylib 0x36632c5d objc_exception_throw + 24
2 CoreFoundation 0x323f31bf -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x323f2649 ___forwarding___ + 508
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这是一个非常常见的问题,很多人都遇到过这个问题 - 就在最近,我也不得不处理这个问题。
Matt Gallagher 在他的博客上发布了关于如何实现这一目标的精彩教程:
< em>UITableViewController 中的异构单元
好吧,我刚刚知道它是如何工作的..
// 这是高度实验性的,尚未经过测试:
让我知道这是否会给您带来任何进一步的帮助..
HTH
That's a very common issue and many people came across that - Just recently I had to deal with that issue, too.
Matt Gallagher posted a great tutorial on how to accomplish that on his blog:
Heterogeneous cells in a UITableViewController
Well, I just got an idea on how it could work..
// THIS IS HIGHLY EXPERIMENTAL AND HAS NOT BEEN TESTED:
Let me know if this brought you any further..
HTH
您错过了最后的
pass:..
参数,并且您正在调用的方法[DoctorsCellNewPager setData:celled:]
没有参数 <代码>通行证设置。因此添加pass
参数,它应该可以正常运行。You have missed out the
pass:..
param on the end, and the method you are calling,[DoctorsCellNewPager setData:celled:]
, doesn't have the parameterpass
set. So add thepass
parameter and it should run fine.