Question

我在iOS中比较新，我找到了一个我需要的手风琴表视图的例子。但事实是，示例是TableViewController，我需要在viewController中实现TableView。你能帮我么。我试图做的是创建tableView，在h文件中将其声明为

@property (strong, nonatomic) IBOutlet UITableView *MyTb;

然后将self.tableView的所有外观更改为self.MyTb但它没有用，哦也改变了

AccordionTableViewController : UITableViewController

到

AccordionTableViewController : UIViewController

所以这是原始代码，请帮助我，并提供一些guiadance，谢谢。

h file：

#import <UIKit/UIKit.h>

@interface AccordionTableViewController : UITableViewController {
NSArray *topItems;
NSMutableArray *subItems; // array of arrays

int currentExpandedIndex;
}

@end

m file：

#import "AccordionTableViewController.h"

#define NUM_TOP_ITEMS 20
#define NUM_SUBITEMS 6

@implementation AccordionTableViewController

- (id)init {
self = [super init];

if (self) {
    topItems = [[NSArray alloc] initWithArray:[self topLevelItems]];
    subItems = [NSMutableArray new];
    currentExpandedIndex = -1;

    for (int i = 0; i < [topItems count]; i++) {
        [subItems addObject:[self subItems]];
    }
}
return self;
}

#pragma mark - Data generators

- (NSArray *)topLevelItems {
NSMutableArray *items = [NSMutableArray array];

for (int i = 0; i < NUM_TOP_ITEMS; i++) {
    [items addObject:[NSString stringWithFormat:@"Item %d", i + 1]];
}

return items;
}   

- (NSArray *)subItems {
NSMutableArray *items = [NSMutableArray array];
int numItems = arc4random() % NUM_SUBITEMS + 2;

for (int i = 0; i < numItems; i++) {
    [items addObject:[NSString stringWithFormat:@"SubItem %d", i + 1]];
}

return items;
}

#pragma mark - View management

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

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

#pragma mark - Table view data source

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [topItems count] + ((currentExpandedIndex > -1) ? [[subItems objectAtIndex:currentExpandedIndex] count] : 0);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *ParentCellIdentifier = @"ParentCell";
static NSString *ChildCellIdentifier = @"ChildCell";

BOOL isChild =
currentExpandedIndex > -1
&& indexPath.row > currentExpandedIndex
&& indexPath.row <= currentExpandedIndex + [[subItems objectAtIndex:currentExpandedIndex] count];

UITableViewCell *cell;

if (isChild) {
    cell = [tableView dequeueReusableCellWithIdentifier:ChildCellIdentifier];
}
else {
    cell = [tableView dequeueReusableCellWithIdentifier:ParentCellIdentifier];
}


if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ParentCellIdentifier] autorelease];
}

if (isChild) {
    cell.detailTextLabel.text = [[subItems objectAtIndex:currentExpandedIndex] objectAtIndex:indexPath.row - currentExpandedIndex - 1];
}
else {
    int topIndex = (currentExpandedIndex > -1 && indexPath.row > currentExpandedIndex)
    ? indexPath.row - [[subItems objectAtIndex:currentExpandedIndex] count]
    : indexPath.row;

    cell.textLabel.text = [topItems objectAtIndex:topIndex];
    cell.detailTextLabel.text = @"";
}

return cell;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
BOOL isChild =
currentExpandedIndex > -1
&& indexPath.row > currentExpandedIndex
&& indexPath.row <= currentExpandedIndex + [[subItems objectAtIndex:currentExpandedIndex] count];

if (isChild) {
    NSLog(@"A child was tapped, do what you will with it");
    return;
}

[self.tableView beginUpdates];

if (currentExpandedIndex == indexPath.row) {
    [self collapseSubItemsAtIndex:currentExpandedIndex];
    currentExpandedIndex = -1;
}
else {

    BOOL shouldCollapse = currentExpandedIndex > -1;

    if (shouldCollapse) {
        [self collapseSubItemsAtIndex:currentExpandedIndex];
    }

    currentExpandedIndex = (shouldCollapse && indexPath.row > currentExpandedIndex) ? indexPath.row - [[subItems objectAtIndex:currentExpandedIndex] count] : indexPath.row;

    [self expandItemAtIndex:currentExpandedIndex];
}

[self.tableView endUpdates];

}

- (void)expandItemAtIndex:(int)index
{
NSMutableArray *indexPaths = [NSMutableArray new];
NSArray *currentSubItems = [subItems objectAtIndex:index];
int insertPos = index + 1;
for (int i = 0; i < [currentSubItems count]; i++) {
    [indexPaths addObject:[NSIndexPath indexPathForRow:insertPos++ inSection:0]];
}
[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:index inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
//[indexPaths release];
}

- (void)collapseSubItemsAtIndex:(int)index
{
NSMutableArray *indexPaths = [NSMutableArray new];
for (int i = index + 1; i <= index + [[subItems objectAtIndex:index] count]; i++)
{
    [indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
}
[self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
//[indexPaths release];
}

- (void)dealloc
{
[topItems release];
[subItems release];
[super dealloc];
}

@end

Answer 1

您必须将视图控制器设置为tableview的委托和数据源：

@interface AccordionTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

在您的标头文件和viewDidLoad中：

-(void)viewDidLoad {
  [super viewDidLoad];
  self.MyTb.delegate = self;
  self.MyTb.dataSource = self;
}

或者您可以在Storyboard中设置数据源和委托。您还必须确保已将表格视图连接到故事板中的MyTb IBOutlet。

从UITableViewController切换到UITableView的示例

1 个答案: