[英]IOS App crashes - unrecognized selector sent to instance
在tableView：cellForRowAtIndexpath方法中，我的代码如下。
当我注释掉双星号（*）中包含的if条件时，应用程序崩溃，但以下提到的异常除外。 如果我不加评论，那就可以了。 由于我是Objective-C的新手，请提供帮助。
- (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;
}
引发的异常是：
-[__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：发票清单的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;
}
)
);
}
您正在检查是否（invoiceList.count == indexPath.row +1），但要使用if（invoiceList.count> indexPath.row）。 另请检查“ numberOfRowsInIndexpath”是否作为invoiceList.count返回。
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