xcode 为什么我不能将 [a objectAtIndex:indexPath.row] 放在 NSString 中
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时间：2020-09-14 20:39:24 来源:igfitidea点击:
Why I can't put [a objectAtIndex:indexPath.row] at NSString
提问by Ruslan
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectedFriend = [friends objectAtIndex:indexPath.row];
//selectedFriend invalid summary
//Initialize the detail view controller and display it.
LeaveMViewController *LMController = [[LeaveMViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
LMController.whosmess = selectedFriend;
[LMController release];
LMController = nil;
please help
请帮忙
NSMutableArray *friends;
NSMutableDictionary *listofFriends;
- (void) parseXMLFileAtURL:(NSString *) URL{
friends = [[NSMutableArray alloc] init];
NSURL *xmlURL = [NSURL URLWithString:URL];
friendsParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
[friendsParser setDelegate:self];
[friendsParser setShouldProcessNamespaces:NO];
[friendsParser setShouldReportNamespacePrefixes:NO];
[friendsParser setShouldResolveExternalEntities:NO];
[friendsParser parse];
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSString * errorString = [NSString stringWithFormat:@"Unable to download story feed from web site (Error code %i )", [parseError code]];
NSLog(@"error parsing XML: %@", errorString);
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
if ([elementName isEqualToString:@"Friend"]){
listOfFriends = [[NSMutableDictionary alloc] init];
[listOfFriends setObject:[attributeDict objectForKey:@"firstname"] forKey:@"firstname"];
[listOfFriends setObject:[attributeDict objectForKey:@"user_id"] forKey:@"user_id"];
[friends addObject:[listOfFriends copy]];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = @"MyIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease];
}
// Set up the cell
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
[cell setText:[NSString stringWithFormat:@"%@, %@",[[friends objectAtIndex: storyIndex] objectForKey: @"firstname"],[[friends objectAtIndex: storyIndex] objectForKey: @"user_id"]]];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectedFriend = @"hui";
who=[[NSString alloc] initWithFormat:@"ai bliat %&",[friends objectAtIndex:indexPath.row]];
// NSString *selectedFriend = [friends objectAtIndex:indexPath.row];
LeaveMViewController *LMController = [[LeaveMViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
LMController.whosmess = selectedFriend;
[LMController release];
LMController = nil;
}
回答by Ruslan
problem solved
问题解决了
NSString *selectedFriend = [friends objectAtIndex:indexPath.row];
was replaced by
被替换了
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
NSString *selectedFriend =[NSString initWithFormat @"%@", [[friends objectAtIndex: storyIndex] objectForKey: @"firstname"]];
