我正在尝试通过查看orignal应用程序的源代码并学习它然后尝试重新键入单独的文件（并确保Interface Builder中的各个部分与原始文件匹配）来重新创建基本应用程序。我遇到的一个问题是我收到以下错误：
2014-05-27 14:02:10.701 Nav Ctrl Practice[3513:60b] adding stock price: to company at index 1
2014-05-27 14:02:10.703 Nav Ctrl Practice[3513:60b] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]'
*** First throw call stack:
(
0 CoreFoundation 0x0000000101a3d495 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010179c99e objc_exception_throw + 43
2 CoreFoundation 0x00000001019e3745 -[__NSArrayM objectAtIndex:] + 213
3 Nav Ctrl Practice 0x0000000100003ad2 -[ParentViewController connectionDidFinishLoading:] + 530
4 Foundation 0x000000010148d36b __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 48
5 Foundation 0x0000000101340bdb -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 210
6 Foundation 0x0000000101340aec -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 69
7 CFNetwork 0x0000000106950637 ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 107
8 CFNetwork 0x000000010694e802 ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 84
9 CoreFoundation 0x00000001019e3f74 CFArrayApplyFunction + 68
10 CFNetwork 0x00000001068c13e7 _ZN19RunloopBlockContext7performEv + 133
11 CFNetwork 0x00000001068c1217 _ZN17MultiplexerSource7performEv + 247
12 CFNetwork 0x00000001068c103a _ZN17MultiplexerSource8_performEPv + 72
13 CoreFoundation 0x00000001019ccd21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
14 CoreFoundation 0x00000001019cc5f2 __CFRunLoopDoSources0 + 242
15 CoreFoundation 0x00000001019e846f __CFRunLoopRun + 767
16 CoreFoundation 0x00000001019e7d83 CFRunLoopRunSpecific + 467
17 GraphicsServices 0x0000000103bb4f04 GSEventRunModal + 161
18 UIKit 0x0000000100349e33 UIApplicationMain + 1010
19 Nav Ctrl Practice 0x0000000100005eb3 main + 115
20 libdyld.dylib 0x0000000101fc25fd start + 1
21 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我在这个网站上发现了一些与上面显示的错误相关的链接（“以NSException类型的未捕获异常终止”），但是没有一个具体原因似乎与我的匹配。我正在使用的代码完全从工作文件中复制。所以我不确定我在这里缺少什么。我已经在该部分的源代码下方包含了数组的问题。
//
// ParentViewController.m
//
#import "ParentViewController.h"
#import "ChildViewController.h"
#import "DataAccess.h"
#import "sqlite3.h"
@interface ParentViewController ()
{
NSMutableArray *arrayOfProducts;
NSMutableArray *arrayOfCompanies;
sqlite3 *productDB;
sqlite3 *companyDB;
}
@end
@implementation ParentViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
arrayOfProducts = [[NSMutableArray alloc] init];
[[self myTableView]setDelegate:self];
[[self myTableView]setDataSource:self];
self.dataAccess = [[DataAccess alloc] init];
[self.dataAccess setCompanyListFromDB];
self.childVC = [[ChildViewController alloc] init];
NSMutableString *urlQuotes = [NSMutableString stringWithString:@"http://download.finance.yahoo.com/d/quotes.csv?s="];
for(int i =0; i<self.dataAccess.companyList.count; i++) {
Company *company = self.dataAccess.companyList[i];
[urlQuotes appendFormat:@"%@", company.stockSymbol];
if(i<self.dataAccess.companyList.count-1)
{ [urlQuotes appendString:@","];
}
[urlQuotes appendString:@"&f=l1,"];
NSLog(@"Quote URL: %@", urlQuotes);
_responseData =[[NSMutableData alloc] init];
NSURLRequest *request = [NSURLRequest requestWithURL:
[NSURL URLWithString:urlQuotes]] ; //we are creating the request here
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]; //we are creating the url connection and firing the request here
[conn start]; //start the connection
}
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
NSLog(@"numberOfSectionsInTableView");
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(@"numberOfRowsInSection");
return [self.dataAccess.companyList count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"UITableViewCell"];
}
int row = indexPath.row;
NSLog(@"Cell at index: %d", row);
//Find the company for this row in the table
Company * company = self.dataAccess.companyList[row];
NSLog(@"Got company %@ at index: %d from companyList Array", company.name, row);
// Configure the cell...
//make the row's text be the company's name
cell.textLabel.text = company.name;
[[cell imageView] setImage: [UIImage imageNamed: company.logo]];
cell.detailTextLabel.text = company.stockPrice;
return cell;
}
#pragma mark - Table view delegate
// In a xib-based application, navigation from a table can be handled in -tableView:didSelectRowAtIndexPath:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
int row = indexPath.row;
NSLog(@"Cell at index: %d", row);
self.childVC.company = self.dataAccess.companyList[row];
// [self.dataAccess test];
self.childVC.dataAccess2 = self.dataAccess;
[self.navigationController pushViewController:self.childVC animated:YES];
}
#pragma mark NSURLConnection Delegate Methods
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the new data to the instance variable you declared
[_responseData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *str = [[NSString alloc] initWithData:_responseData encoding:NSUTF8StringEncoding];
NSMutableArray *responseArray= [NSMutableArray arrayWithArray: [str componentsSeparatedByString:@"\n"] ];
//includes extra blank character at the end; just leaving it there for now
NSLog(@"Response Array: %@", responseArray);
for(int i=0;i<[self.dataAccess.companyList count];i++){
Company *company = self.dataAccess.companyList[i];
NSMutableString *string = responseArray[i];
NSLog(@"adding stock price: %@ to company at index %d", string, i);
company.stockPrice = string;
} //simple loop for referring to items in companyList
[self.tableView reloadData];
NSLog (@"connectionDidFinishLoading Done");
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog (@"connection didFailWithError: %@", error.debugDescription);
}
@end
答案 0 :(得分：2)
问题似乎出现在connectionDidFinishLoading:。
for(int i=0;i<[self.dataAccess.companyList count];i++){
Company *company = self.dataAccess.companyList[i];
NSMutableString *string = responseArray[i];
...
}
在这里，您对i和companyList使用相同的迭代器变量（responseArray），即使它们的大小不同。您应该确保i小于responseArray和companyList的长度：
for(int i=0;i<[self.dataAccess.companyList count] && i<[responseArray count];i++){
Company *company = self.dataAccess.companyList[i];
NSMutableString *string = responseArray[i];
...
}