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[英]My TableView datasource functions aren't being called and I don't know why
[英]I don't know why my Tableview did not push the DetailView when row is selected
我找到了这个示例代码,并修改了代码以使其符合我的要求。 tableview 从 plist 加载数据,它的工作数据显示在部分中,它现在在选择一行时工作,我想推送一个 Detailviewcontroller 以显示更多详细信息。 Grrrr,它不起作用,我不知道为什么。 这段代码和另一个可以正常工作的代码之间的区别在于,ICB_SectionedTableViewDemoViewController 在 appDelegate 中被声明为 class,我不知道当我想要推送 DetailViewController 时它是否会发生。
这是我的根控制器的代码,名为 ICB_SectionedTableViewDemoViewController.m
// ICB_SectionedTableViewDemoViewController.m
// ICB_SectionedTableViewDemo
//
// Created by Matt Tuzzolo on 12/10/10.
// Copyright 2010 ELC Technologies. All rights reserved.
//
#import "ICB_SectionedTableViewDemoViewController.h"
#import "ICB_SectionedTableViewDemoAppDelegate.h"
#import "DetailViewController.h"
@implementation ICB_SectionedTableViewDemoViewController
@synthesize books, sections ;
- (void)viewDidLoad {
self.books = [NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"books" ofType:@"plist"]];
self.sections = [[NSMutableDictionary alloc] init];
BOOL found;
// Loop through the books and create our keys
for (NSDictionary *book in self.books)
{
NSString *c = [[book objectForKey:@"author"] 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];
}
}
// Loop again and sort the books into their respective keys
for (NSDictionary *book in self.books)
{
[[self.sections objectForKey:[[book objectForKey:@"author"] substringToIndex:1]] addObject:book];
}
// Sort each section array
for (NSString *key in [self.sections allKeys])
{
[[self.sections objectForKey:key] sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"author" ascending:YES]]];
}
[super viewDidLoad];
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.sections allKeys] count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if(section == 0)
return @"COULEURS";
else
return @"MOTIFS";
// 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:)];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
NSDictionary *book = [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
cell.textLabel.text = [book objectForKey:@"title"];
cell.detailTextLabel.text = [book objectForKey:@"description"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//Initialize the detail view controller and display it.
DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
dvController.CL = [self.books objectAtIndex:indexPath.row];
[self.navigationController pushViewController:dvController animated:YES];
// [self presentModalViewController:dvController animated:YES];
// [self.view addSubview:dvController.view];
[dvController release];
}
- (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)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
感谢您非常有用的帮助,并提醒我是初学者,我的第一语言是法语。
看了项目之后,好像没有创建UINavigationController。 因此,我建议您将此代码用于application:didFinishLaunchingWithOptions:
:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UINavigationController* navigation = [[UINavigationController alloc] init];
[navigation pushViewController:viewController animated:NO];
[window addSubview:navigation.view];
[self.window makeKeyAndVisible];
return YES;
}
在这里,实例化了 UINavigationController,并将您的第一个(根)controller 推到它上面。
重要提示:您的应用程序有更多问题,因此无法运行,但至少您的 DetailView controller 将被加载并尝试显示。 关于我发现的问题:
在didSelectRowAtIndexPath
中,您使用了错误的笔尖名称;
在DetailViewController
的viewDidLoad
中,您使用的是未定义的属性CL.title
;
一旦您解决了这些问题,可能会显示详细信息视图。
旧答案:
在tableView:didSelectRowAtIndexPath:
中设置断点并检查您的DetailViewController
是否已正确创建,并且self.navigationController
是否为 nil。
或者,您可以将 NSLog 跟踪添加到您的代码中(这是一种重要的调试技术):
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//Initialize the detail view controller and display it.
DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
dvController.CL = [self.books objectAtIndex:indexPath.row];
[self.navigationController pushViewController:dvController animated:YES];
NSLog(@"navController: %@", [self.navigationController description]);
NSLog(@"dvController.CL: %@", [dvController.CL description]);
// [self presentModalViewController:dvController animated:YES];
// [self.view addSubview:dvController.view];
[dvController release];
}
tableview应该是uinavigationcontroller的viewcontroller。请检查。
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