使用Xcode6.1编译时未调用cellForRowAtIndexPath

Question

在我的应用程序中，我有一个带有表格视图的弹出窗口。

当使用Xcode5.1编译时，一切工作正常，但使用Xcode6.1编译的相同代码无法调用cellForRowAtIndexPath delegate方法。

调用其他委托方法。

一个有趣的地方是self.tableView.rowHeight;返回-1

我已经尝试显式地将委托和数据源设置为self，但这没有什么区别

这个类由下面的代码调用；

`-(IBAction)selectLanguage:(id)sender
{
    ATLMLanguagePopoverTableViewController *pvc = [[ATLMLanguagePopoverTableViewController alloc] initWithNibName:nil bundle:nil];
    pvc.target = self;
    pvc.action = @selector(popoverDidSelectItem:);
    pvc.items = [[[ATLMLibraryManager getManager]libraryDefaults]getAvailableLanguageNames];
    _myPopoverController.contentViewController = pvc;
    [_myPopoverController setPopoverContentSize:[pvc popoverContentSize]];
    [_myPopoverController presentPopoverFromBarButtonItem:(UIBarButtonItem *)sender permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES]; 
}
` 

Hear是类的定义

​

/

/  LanguagePopoverTableViewController.m
//  SalesAid
//
//  Created by phuang on 1/16/13.
//  Copyright (c) 2013 Align Technology. All rights reserved.
//

#import "ATLMLanguagePopoverTableViewController.h"
#import "ATLMLocalizationManager.h"
#import "ATLMUtils.h"

@interface ATLMLanguagePopoverTableViewController ()

@end

@implementation ATLMLanguagePopoverTableViewController
@synthesize items, selectedItem, target, action;

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        selectedItem = -1;
        target = nil;
        action = NULL;
    }
    return self;
}

-(void) resetLocalization {
    [self.tableView reloadData];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)setItems:(NSArray *)newItems {
    items = [newItems copy];
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.tableView reloadData];
    });
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];



}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];



    selectedItem=0;
    NSString *curLang = (NSString *) [[ATLMLocalizationManager getManager]getCurrentLanguage]  ;
    for(int i = 0; i < items.count ; i++ ){
        if([curLang isEqualToString:(NSString *)[items objectAtIndex:i]]){
            selectedItem = i;
            break;
        }

    }
    NSIndexPath *i = [NSIndexPath indexPathForRow:selectedItem inSection:0];
    [self.tableView selectRowAtIndexPath:i animated:NO scrollPosition:UITableViewScrollPositionNone];

}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

- (CGSize)popoverContentSize {
    NSInteger rowHeight = self.tableView.rowHeight;
    UITableView *tv = self.tableView;
    rowHeight = 50;
    return CGSizeMake(100, [items count] * rowHeight);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [items count];
}

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];


    }
    cell.textLabel.font = [UIFont systemFontOfSize:14];
    UIView *myBackView = [[UIView alloc] initWithFrame:cell.frame];
    myBackView.backgroundColor = [ATLMUtils getAlignBlue];
    cell.selectedBackgroundView = myBackView;
    [cell setSelectedBackgroundView: myBackView ];



    NSString *textLabelKey = [items objectAtIndex:[indexPath indexAtPosition:1]];
    cell.textLabel.text = ATLMLocalizedString(textLabelKey, nil);
    cell.textLabel.textAlignment = NSTextAlignmentCenter;

    return cell;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    selectedItem = indexPath.row;
    if (target != nil && action != NULL) {
        [target performSelector:action withObject:self];
    }
}
@end

`

Answer 1

可以回答我自己的问题；

基本上，代码在调用init方法之后将模型添加到视图控制器。但是，线程模型似乎发生了一些变化，视图是在添加模型之前创建的，因此模型中的行数为零

解决方案是将模型作为init方法的一部分进行传递。

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil items:(NSArray *)itemArray
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        items = [itemArray copy];
        selectedItem = -1;
        target = nil;
        action = nil;
    }
    return self;
}