【发布时间】：2016-02-13 17:55:15
【问题描述】：
在 tableView:cellForRowAtIndexpath 方法中，我的代码如下。
当我注释掉包含在双星号 (*) 中的 if 条件时，应用程序会崩溃，但会出现下面提到的异常。如果我取消注释它，那么它工作正常。请帮忙，因为我是 Objective-C 的新手。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @“MyTableCell";
cell = (MyTableCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@“MyTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
**if (invoiceList.count == indexPath.row + 1)**
{
NSMutableDictionary *currentDictionary = [invoiceList objectAtIndex:indexPath.row];
cell.invoiceDetails = currentDictionary;
for ( NSString *key in [cell.invoiceDetails allKeys]) {
NSString *value = [cell.invoiceDetails valueForKey:key];
if([key isEqualToString:MERCHANT_NAME]){
cell.merchantNameValue.text = (value == (id)[NSNull null]) ? @"" : value;
}
if([key isEqualToString:INVOICE_ID]){
cell.invoiceIdValue.text = (value == (id)[NSNull null]) ? @"" : value;
}
if([key isEqualToString:TOTAL_AMOUNT]){
cell.totalAmountValue.text = (value == (id)[NSNull null]) ? @"" : value;
}
}
}
return cell;
}
抛出的异常是：
-[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance 0x7fc2a604e9f0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance 0x7fc2a604e9f0'
*** First throw call stack:
(
0 CoreFoundation 0x000000010fbd1f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010f63ebb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010fbd904d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010fb3127c ___forwarding___ + 988
4 CoreFoundation 0x000000010fb30e18 _CF_forwarding_prep_0 + 120
5 MobileWalletBanking 0x000000010cf0037f -[MyViewController tableView:cellForRowAtIndexPath:] + 479
6 UIKit 0x000000010dd9b4b3 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 508
7 UIKit 0x000000010dd7afb1 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2846
8 UIKit 0x000000010dd90e3c -[UITableView layoutSubviews] + 213
9 UIKit 0x000000010dd1d973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521
10 QuartzCore 0x000000010d2bade8 -[CALayer layoutSublayers] + 150
...
)
编辑： invoiceList 的 NSLog：
{
501 = 72;
610 = Merchant1;
611 = Merchant1;
612 = 51573;
615 = 51573;
616 = "07/08/2015 00:00:00";
617 = "64.01";
618 = 498;
619 = 498;
662 = (
{
501 = 72;
520 = "15.18";
615 = 51573;
616 = "07/08/2015 00:00:00";
620 = 43;
621 = "15.18";
623 = True;
624 = 43;
740 = “Text1";
},
{
501 = 72;
520 = 0;
615 = 51573;
616 = "07/08/2015 00:00:00";
620 = 10;
621 = 0;
623 = True;
624 = 10;
740 = “Text2";
},
{
501 = 72;
520 = "37.63";
615 = 51573;
616 = "07/08/2015 00:00:00";
620 = 2;
621 = "37.63";
623 = True;
624 = 2;
740 = “Text3";
},
{
501 = 72;
520 = "11.20";
615 = 51573;
616 = "07/08/2015 00:00:00";
620 = 3;
621 = "11.20";
623 = True;
624 = 3;
740 = “Text4";
},
{
501 = 72;
520 = 0;
615 = 51573;
616 = "07/08/2015 00:00:00";
620 = 14;
621 = 0;
623 = True;
624 = 14;
740 = “Text5";
}
);
663 = (
(
{
Key = 501;
Value = 83;
},
{
Key = Name;
Value = "INVOICE_CONNECTION_PROPERTIES";
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 610;
Value = "";
},
{
Key = 615;
Value = 51573;
},
{
Key = 620;
Value = 1;
},
{
Key = "SERVICE_NAME";
Value = “Text1";
},
{
Key = "FIELD_1";
Value = 4272035;
},
{
Key = "FIELD_1_CONNECTION_FIELD_ID";
Value = 000000000000481;
},
{
Key = "FIELD_1_QS_NAME";
Value = "Id";
},
{
Key = "FIELD_1_QS_VALUE";
Value = "Id";
},
{
Key = "FIELD_2";
Value = 10;
},
{
Key = "FIELD_2_CONNECTION_FIELD_ID";
Value = 000000000000482;
},
{
Key = "FIELD_2_QS_NAME";
Value = "index1";
},
{
Key = "FIELD_2_QS_VALUE";
Value = "index1";
},
{
Key = "FIELD_3";
Value = "";
},
{
Key = "FIELD_3_IS_MODIFIED";
Value = 1;
},
{
Key = "FIELD_3_CONNECTION_FIELD_ID";
Value = 000000000000483;
},
{
Key = "FIELD_3_QS_NAME";
Value = "index2";
},
{
Key = "FIELD_3_QS_VALUE";
Value = "index2";
},
{
Key = "FIELD_4";
Value = R;
},
{
Key = "FIELD_4_CONNECTION_FIELD_ID";
Value = 000000000000488;
},
{
Key = "FIELD_4_QS_NAME";
Value = "index_Type";
},
{
Key = "FIELD_4_QS_VALUE";
Value = "Index_Type";
}
),
(
{
Key = 501;
Value = 83;
},
{
Key = Name;
Value = "INVOICE_CONNECTION_PROPERTIES";
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 610;
Value = "";
},
{
Key = 615;
Value = 51573;
},
{
Key = 620;
Value = 2;
},
{
Key = "SERVICE_NAME";
Value = “Text2";
},
{
Key = "FIELD_1";
Value = 4272033;
},
{
Key = "FIELD_1_CONNECTION_FIELD_ID";
Value = 000000000000481;
},
{
Key = "FIELD_1_QS_NAME";
Value = "Id";
},
{
Key = "FIELD_1_QS_VALUE";
Value = "Id";
},
{
Key = "FIELD_2";
Value = 3;
},
{
Key = "FIELD_2_CONNECTION_FIELD_ID";
Value = 000000000000482;
},
{
Key = "FIELD_2_QS_NAME";
Value = "index1";
},
{
Key = "FIELD_2_QS_VALUE";
Value = "index1";
},
{
Key = "FIELD_3";
Value = "";
},
{
Key = "FIELD_3_IS_MODIFIED";
Value = 1;
},
{
Key = "FIELD_3_CONNECTION_FIELD_ID";
Value = 000000000000483;
},
{
Key = "FIELD_3_QS_NAME";
Value = "index2";
},
{
Key = "FIELD_3_QS_VALUE";
Value = "index2";
},
{
Key = "FIELD_4";
Value = C;
},
{
Key = "FIELD_4_CONNECTION_FIELD_ID";
Value = 000000000000488;
},
{
Key = "FIELD_4_QS_NAME";
Value = "index_type";
},
{
Key = "FIELD_4_QS_VALUE";
Value = "index_type";
}
)
);
664 = (
(
{
Key = 501;
Value = 73;
},
{
Key = 625;
Value = 000000000000481;
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 626;
Value = "id";
},
{
Key = 627;
Value = 1;
},
{
Key = 590;
Value = True;
}
),
(
{
Key = 501;
Value = 73;
},
{
Key = 625;
Value = 000000000000482;
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 626;
Value = "index1";
},
{
Key = 627;
Value = 2;
},
{
Key = 590;
Value = True;
}
),
(
{
Key = 501;
Value = 73;
},
{
Key = 625;
Value = 000000000000483;
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 626;
Value = "index2";
},
{
Key = 627;
Value = 3;
},
{
Key = 590;
Value = True;
}
),
(
{
Key = 501;
Value = 73;
},
{
Key = 625;
Value = 000000000000488;
},
{
Key = 611;
Value = Merchant1;
},
{
Key = 626;
Value = "index_type";
},
{
Key = 627;
Value = 4;
},
{
Key = 590;
Value = True;
}
)
);
}
【问题讨论】：
-
indexPath+1条件的目的是什么？invoiceList是您的数据数组吗？也发布您的numberOfRows方法代码。 -
您确定异常确实发生在您向我们展示的 objectAtIndex 行吗？预先打印 invoiceList 的类：NSLog(@"%@",[invoiceList class])
-
能否提供发票清单NSLog
-
大家好，indexPath+1条件没有特殊用途。但是，在这种情况下，代码不会抛出任何异常并且可以完美运行。我还在 EDIT 部分提供了 invoiceList NSLog。感谢您的支持。
-
上面带有UITableView的代码是写在First ViewController上的。当用户在 UITableView 中选择一行并按下 Next 按钮时，其详细信息将显示在第二个 ViewController 上。假设只选择了一行并单击了 Next 按钮，则调用第二个 ViewController 的 viewDidLoad 方法，一旦完成，运行时也会调用第一个 ViewController 的 cellForRowAtIndexPath。此时，它抛出异常并且 numberOfRowsInSection 方法返回 12 代替 1。我无法理解为什么 numberOfRowsInSection 返回 12。它应该返回 1。请帮忙。
标签： ios objective-c iphone uitableview exception