一切正常但无法为searchResultsTableView的自定义单元格的UILable赋值。我为我的表视图控制器使用相同的自定义UITableViewCell,它是searchDisplayController。我正在使用storyboard作为表视图控制器和表视图单元格。正如您在代码中看到的,如果我NSLog的值为self.searchResults [indexPath.row] [@“name”],我可以在控制台中看到结果,但是如果我将此值赋给cell.name.text ,它不会工作,但在表视图控制器中,它的工作。单元格的imageView正在工作,我无法为单元格的UILabel分配任何值。
- (void)viewDidLoad
{
[super viewDidLoad];
[self.searchDisplayController.searchResultsTableView registerClass:[LocalCell class] forCellReuseIdentifier:@"Cell2"];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
static NSString *CellIdentifier2 = @"Cell2";
if (tableView == self.searchDisplayController.searchResultsTableView) {
LocalCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier2 forIndexPath:indexPath];
if (!cell) {
cell = [[LocalCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier2];
}
cell.name.text = self.searchResults[indexPath.row][@"name"];
NSLog(@"%@", self.searchResults[indexPath.row][@"name"]); // has value
NSLog(@"%@", cell.name.text); // null
return cell;
} else
{
LocalCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[LocalCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.name.text = self.restaurants[indexPath.row][@"name"];
return cell;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 80;
}
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
float radius = 1000.0f;
NSString *searchContent = [searchBar.text stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
if ([searchContent length] > 0) {
NSString *urlString = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=%f,%f&radius=%f&types=food&key=%@&sensor=true&name=%@", [[[NSUserDefaults standardUserDefaults] objectForKey:@"lat"] floatValue], [[[NSUserDefaults standardUserDefaults] objectForKey:@"lon"] floatValue], radius, AppKey, searchContent];
__weak LocalViewController *weakSelf = self;
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];
NSURLSessionDataTask *taks = [session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (!error) {
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
weakSelf.nextPageToken = dict[@"next_page_token"];
weakSelf.searchResults = dict[@"results"];
NSLog(@"search results: %@", weakSelf.searchResults);
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf.searchDisplayController.searchResultsTableView reloadData];
});
}
}];
[taks resume];
}
}
LocalCell.h
#import <UIKit/UIKit.h>
@interface LocalCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *name;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UILabel *desc;
@property (weak, nonatomic) IBOutlet UILabel *distance;
@end
答案 0 :(得分:2)
我查看了你的项目:
NSLog(@"%@", cell.name.text); // null
因为cell.name是nil。 解释是:然后你加载你的普通tableView,单元格“LocalCell”从Storyboard加载,分配和初始化你的标签,但是你使用self.searchDisplayController.searchResultsTableView初始化“LoadCell”,但从不初始化他的标签(因为他们是弱IBOutlets - 并用于故事板。)
为了解决您的问题,我找到了3个解决方案: 1.创建另一个具有对其UILabel的强引用的SearchCell,初始化SearchCell的所有UILabel - (id)init。然后在你的控制器中使用它。
[self.searchDisplayController.searchResultsTableView registerClass:[SearchCell class] forCellReuseIdentifier:@"SearchCell"];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
static NSString *SearchCellIdentifier = @"SearchCell";
Restaurant *res;
if (tableView == self.searchDisplayController.searchResultsTableView)
{
SearchCell *cell = [tableView dequeueReusableCellWithIdentifier:SearchCellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[SearchCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
res = (Restaurant *)self.searchResults[indexPath.row];
cell.nameLabel.text = res.name;
cell.descLabel.text = res.desc;
// image load
return cell;
}
else
{
LocalCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[LocalCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
res = (Restaurant *)self.restaurants[indexPath.row];
cell.nameLabel.text = res.name;
cell.descLabel.text = res.desc;
// image load
return cell;
}
}
另一种方法是使用您的单元格“SearchCellNib”创建一个nib,并使用您创建的LoadCell类。对于加载笔尖使用:
cell = (LoadCell*)[self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = (LoadCell*)[[[NSBundle mainBundle] loadNibNamed:@"SearchCellNib" owner:nil options:nil] objectAtIndex:0];
}
或使用UITableViewCell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SearchCellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
res = (Restaurant *)self.searchResults[indexPath.row];
cell.textLabel.text = res.name;
cell.detailTextLabel.text = res.desc;