我在查看tableView时遇到问题。所有数据都存在于表格视图中，直到我将我的代码添加到名称部分。
这是我按名称获取数组和分区的代码：
-(void)setupReportsFromJSONArray:(NSData*)dataFromReportsArray{
BOOL found;
NSError *error;
// NSMutableArray *reportsArray = [[NSMutableArray alloc] init];
NSArray *arrayFromServer = [NSJSONSerialization JSONObjectWithData:dataFromReportsArray options:0 error:&error];
if(error){
NSLog(@"error parsing the json data from server with error description - %@", [error localizedDescription]);
}
else {
reportsArray = [[NSMutableArray alloc] init];
for(NSDictionary *eachReport in arrayFromServer)
{
ReportsDataObject *report = [[ReportsDataObject alloc] initWithJSONData:eachReport];
[reportsArray addObject:report];
NSString *c = [[eachReport objectForKey:@"title"] substringToIndex:1];
found = NO;
for (NSString *str in [self.sections allKeys])
{
if ([str isEqualToString:c])
{
found = YES;
}
}
if (!found)
{
[self.sections setValue:[[NSMutableArray alloc] init] forKey:c];
}
}
}
NSLog(@"Array Populated");
NSLog(@"%u reports found",reportsArray.count);
//Now you have your reportsArray filled up with all your data objects
for (NSDictionary *eachReport in arrayFromServer)
{
[[self.sections objectForKey:[[eachReport objectForKey:@"title"] substringToIndex:3]] addObject:eachReport];
}
// Sort each section array
for (NSString *key in [self.sections allKeys])
{
[[self.sections objectForKey:key] sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"title" ascending:YES]]];
[reportsTable reloadData];
}
}
-(void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.sections allKeys] count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
{
return [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section]] count];
}
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return [[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"Cell";
UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}
//The beauty of this is that you have all your data in one object and grab WHATEVER you like
//This way in the future you can add another field without doing much.
if([reportsArray count] == 0){
cell.textLabel.text = @"no reports to show";
}
else{
// ReportsDataObject *currentReport = [reportsArray objectAtIndex:indexPath.row];
// cell.textLabel.text = [currentReport reportName];
// in the future you can grab whatever data you need like this
//[currentReport buildingName], or [currentReport reportName];
}
return(cell);
@end
这会在我的tableView中加载一个空白屏幕。关于我哪里出错的任何想法？我在这个代码的基础上构建了一个教程，我试图改变它以使我受益，因为这些细节来自使用plist的教程。
我已经尝试过多种方式，这是我完成此代码的第一种方式，但未导致应用程序终止。
如果我是NSLog这个代码，哪里是最好的记录地点，这样我才能得到有益的信息？
改变编辑
以下是我根据其他帮助输入的新NSLog请求：
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
NSUInteger count = [[self.sections allKeys] count];
NSLog(@"Number of sections: %d", count);
return count;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
{
NSUInteger count = [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section]] count];
NSLog(@"Number of rows in section: %d", count);
return count;
}
}
NSLog输出堆栈：
2014-03-17 15:43:52.189 TESG-iConnect[14502:a0b] Array Populated
2014-03-17 15:43:52.189 TESG-iConnect[14502:a0b] 84 reports found
2014-03-17 15:43:52.190 TESG-iConnect[14502:a0b] Number of sections: 5
2014-03-17 15:43:52.191 TESG-iConnect[14502:a0b] Number of rows in section: 0
2014-03-17 15:43:52.191 TESG-iConnect[14502:a0b] Number of rows in section: 0
2014-03-17 15:43:52.192 TESG-iConnect[14502:a0b] Number of rows in section: 0
2014-03-17 15:43:52.192 TESG-iConnect[14502:a0b] Number of rows in section: 0
2014-03-17 15:43:52.192 TESG-iConnect[14502:a0b] Number of rows in section: 0