我知道cellForRowAtIndexPath方法没有被调用,因为我从未在其中看到NSLog
消息。我已经设置了UITableView
的dataSource
和delegate
属性,并且还在头文件中声明了UITableViewDelegate
和UITableViewDataSource
。我错过了什么?
- (void)viewDidLoad {
[self.view setBackgroundColor:[UIColor grayColor]];
tableData = [[NSMutableArray alloc] init];
matchesForUser = [[NSMutableArray alloc] init];
sortedFirstArray = [[NSArray alloc] init];
sortedSecondArray = [[NSArray alloc] init];
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20) style:UITableViewStylePlain];
_tableView.dataSource = self;
_tableView.delegate = self;
[self.view addSubview:_tableView];
countUsers = 0;
PFQuery *query = [PFQuery queryWithClassName:@"_User"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (PFObject *object in objects) {
NSLog(@"%@", object.objectId);
tableData[countUsers] = [object valueForKey:@"username"];
matchesForUser[countUsers] = [object valueForKey:@"matches"];
}
}else{
NSLog([error description]);
}
NSLog(@"***tabledata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[tableData count]]);
NSLog(@"***matchesdata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[matchesForUser count]]);
}];
dictionary = [NSDictionary dictionaryWithObjects:matchesForUser forKeys:tableData];
sortedFirstArray = [[dictionary allKeys] sortedArrayUsingSelector:@selector(compare:)];
sortedSecondArray = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
backToMap = [[UIButton alloc] initWithFrame:CGRectMake(80, 518, 160, 30)];
backToMap.backgroundColor = [UIColor colorWithRed:33.0f/255.0f green:156.0f/255.0f blue:41.0f/255.0f alpha:1.0f];
[backToMap addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside];
[backToMap setTitle:@"BACK TO MAP" forState:UIControlStateNormal];
[self.view addSubview:backToMap];
}
- (void)dismiss {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [tableData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *simpleTableIdentifier = @"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
NSString *username = [[sortedFirstArray objectAtIndex:indexPath.row] stringByAppendingString:@" "];
NSString *matchAmount = [sortedSecondArray objectAtIndex:indexPath.row];
NSLog(@"***username***");
NSLog(username);
NSLog(@"***matchamount***");
NSLog(matchAmount);
cell.textLabel.text = [username stringByAppendingString:matchAmount];
return cell;
}
尝试做以下事情
1.)像一样注册您的tableView
[_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"SimpleTableItem"];
2.)然后在下方添加[_tableView reloadData];
for (PFObject *object in objects) {
NSLog(@"%@", object.objectId);
tableData[countUsers] = [object valueForKey:@"username"];
matchesForUser[countUsers] = [object valueForKey:@"matches"];
}
if (!error)
部件内部。。
所以你的更新代码必须看起来像
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (PFObject *object in objects) {
NSLog(@"%@", object.objectId);
tableData[countUsers] = [object valueForKey:@"username"];
matchesForUser[countUsers] = [object valueForKey:@"matches"];
}
[_tableView reloadData];
}else{
NSLog([error description]);
}
NSLog(@"***tabledata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[tableData count]]);
NSLog(@"***matchesdata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[matchesForUser count]]);
}];
1)在这里您确实需要使用countUsers=0;如果需要,则需要将for循环内部的值增加1。否则,它将每次覆盖索引0处的值。
2) 您正在使用后台调用方法来获取数据。因此,获取数据需要时间,控件将进一步执行以下代码。但此时matchesForUser数组为空,字典也为空。所以在单元格中,它不会显示任何内容,也不会从单元格中看到NSLOG。
而不是这个
ini
dictionary = [NSDictionary dictionaryWithObjects:matchesForUser forKeys:tableData];
sortedFirstArray = [[dictionary allKeys] sortedArrayUsingSelector:@selector(compare:)];
sortedSecondArray = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
3) 试试这个,
PFQuery *query = [PFQuery queryWithClassName:@"_User"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
dispatch_async(dispatch_get_main_queue(), ^{
if (!error) {
for (PFObject *object in objects) {
NSLog(@"%@", object.objectId);
[tableData addObject:[object valueForKey:@"username"]];
[matchesForUser addObject:[object valueForKey:@"matches"]];
}
dictionary = [NSDictionary dictionaryWithObjects:matchesForUser forKeys:tableData];
sortedFirstArray = [[dictionary allKeys] sortedArrayUsingSelector:@selector(compare:)];
sortedSecondArray = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
[_tableView reloadData];
}else{
NSLog([error description]);
}
NSLog(@"***tabledata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[tableData count]]);
NSLog(@"***matchesdata***");
NSLog([NSString stringWithFormat:@"%lu", (unsigned long)[matchesForUser count]]);
});
}];
是否在ViewDidLoad中重新加载了Tableview?像
[_tableView reloadData];
后再次重新加载表格
dictionary = [NSDictionary dictionaryWithObjects:matchesForUser forKeys:tableData];
sortedFirstArray = [[dictionary allKeys] sortedArrayUsingSelector:@selector(compare:)];
sortedSecondArray = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
[_tableView reloadData];
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [tableData count];
}
count
是0?您可以键入NSLog("%@", @(tableData.count));
或仅键入return 1;
进行测试。如果方法返回0,则UITableView
首先发送tableView:numberOfRowsInSection:
。它将不会调用CCD_ 14。
正如@PiyushSharma提到的,你应该Register your tableView
。