UITableViewController不加载数据 [英] UITableViewController not loading data

问题描述

因此，我创建了UITableViewController的子类，并将委托和数据源设置为其自身.但是像cellForRowAtIndexPath和numberOfRowsInSection这样的方法永远都不会被调用.我的numberOfSectionsInTableView每次都会返回1. 这就是viewDidLoad()的样子

So I have created a subclass of UITableViewController and set the delegate and datasource to itself. But still the methods like cellForRowAtIndexPath and numberOfRowsInSection never get called.My numberOfSectionsInTableView return 1 everytime. This is how viewDidLoad() looks like

- (void)viewDidLoad {
[super viewDidLoad];
NSMutableArray* list = [[NSMutableArray alloc] init];
self.tableView = [[UITableView alloc] init];
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.actionList = list;
self.clearsSelectionOnViewWillAppear = NO;
self.contentSizeForViewInPopover = CGSizeMake(320.0, 400.0);
[self.actionList addObject:@"t1"];
[self.actionList addObject:@"t2"];
}

当我尝试将其加载到弹出窗口中时，我得到的只是一个空白的弹出窗口.

When I try to load this in a popover all I get is a blank popover.

我花了很多时间在这上面.请帮帮我.

I have spent a lot of time on this. Please help me out.

.m文件

//KLActionsViewController.m #import"KLActionsViewController.h"

// KLActionsViewController.m #import "KLActionsViewController.h"

@interface KLActionsViewController ()

@end

@implementation KLActionsViewController
@synthesize actionList,delegate;

//- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
//{
//    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
//    if (self) {
//        // Custom initialization
//    }
//    return self;
//}

//- (void)loadView
//{
//    
//}

- (void)viewDidLoad {
    [super viewDidLoad];
    NSMutableArray* list = [[NSMutableArray alloc] init];
    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320.0, 100.0) style:UITableViewStyleGrouped];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.actionList = list;
    self.clearsSelectionOnViewWillAppear = NO;
    self.contentSizeForViewInPopover = CGSizeMake(320.0, 200.0);
    [self.actionList addObject:@"t1"];
    [self.actionList addObject:@"t2"];
    [self.tableView reloadData];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    NSLog(@"in number of section");
    return 1;
}

- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    NSString* lab = [self.actionList objectAtIndex:indexPath.row];
//    NSLog(lab);
    NSLog(@"here in there");
    cell.textLabel.text = lab;
    return cell;
}

- (NSInteger)numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"Total entries : %i ",[self.actionList count]);
    return [self.actionList count];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (self.delegate != nil) {
        [self.delegate actionSelected:indexPath.row];
    }
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    self.actionList = nil;
    self.delegate = nil ;
    // Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

.h文件

#import <UIKit/UIKit.h>

@protocol KLActionsViewControllerDelegate
- (void)actionSelected:(NSInteger)index;
@end

@interface KLActionsViewController : UITableViewController <UITableViewDataSource,UITableViewDelegate>
@property (nonatomic, retain) NSMutableArray* actionList;
@property (nonatomic, assign) id<KLActionsViewControllerDelegate> delegate;


@end

推荐答案

如果要扩展UITableViewController，它已经在viewDidLoad上创建了UITableView实例.尝试在那里设置一个断点并在调试器控制台中检查它:

If you are extending the UITableViewController it already creates UITableView instance at viewDidLoad. Try to set a breakpoint there and check it in debugger console:

po [self view]

因此，此时您不应该自己创建UITableView实例.如果您需要表格视图的自定义初始化，则应该更早完成

Therefore you should not create the UITableView instance by yourself at this point. If you need a custom init of the table view you should do it earlier

编辑

从文档中:

创建表视图的最简单且推荐的方法是创建自定义UITableViewController对象. UITableViewController创建表视图并将其自身分配为委托和数据源.

如果选择不使用UITableViewController进行表视图管理，则必须免费"复制此类提供的内容.

- (void)loadView // <-- NOT VIEW DID LOAD!
{
    UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]
                                  style:UITableViewStylePlain];
    tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
    tableView.delegate = self;
    tableView.dataSource = self;
    [tableView reloadData];

    self.view = tableView;
    [tableView release];
}

这篇关于UITableViewController不加载数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！