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Iphone编程:多个UITableViews从同一个源读取?

multiple-tables datasource uitableview xcode iphone

Veeru · 技术社区 · 14 年前

UITableView issue when using separate delegate/dataSource ,尽管我有不同的问题。我刚开始学iPhone编程。

主视图表的数据源和委托被设置为文件的所有者,我在其中添加了必要的代码来处理表数据,一切都很好。但是,当子视图中的第二个表似乎使应用程序崩溃时,我做了同样的事情,设置数据源并将其委托给文件的所有者,并重复了与主视图的表相同的过程。我不知道为什么会这样。

例如: FirstView 控制器有一个表 FirstTable ,将数据源和委托设置为 Files . 我在中添加了以下内容 FirstView.m

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 4;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"LibraryListingCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                       reuseIdentifier:CellIdentifier] autorelease];
    }
    cell.textLabel.text =@"Table Cell";
    return cell;
}

一切正常。当我用第二个表和第二个视图重复这一点时,应用程序崩溃了

reason: '-[UISectionRowData tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x69188d0'

numberOfRowsInSection 和 cellForRowAtIndexPatch secondview.m 并将第二个表的委托和数据源设置为文件的所有者。如果删除第二个表的委托和数据源,应用程序不会崩溃,但在第二个视图中有一个空表。

有什么建议吗?或者是我遗漏了一些关键的概念?

3 回复 | 直到 7 年前

Gilles 'SO- stop being evil' 13 年前

这是主视图控制器 .h 文件。

#import <UIKit/UIKit.h>
#import "SubView.h"
@interface StackOverTableSubViewViewController : UIViewController <UITableViewDelegate,UITableViewDataSource>
{
    UIView *contentView;
    UITableView *tblVw;
    NSMutableArray *array;
    SubView *SubViewObj;
}
@property(nonatomic,retain) UIView *contentView;
@property(nonatomic,retain) UITableView *tblVw;
@property(nonatomic,retain) NSMutableArray *array;
@property(nonatomic,retain) SubView *SubViewObj;
@end

.m 文件。

#import "StackOverTableSubViewViewController.h"
@implementation StackOverTableSubViewViewController
@synthesize contentView,tblVw,array,SubViewObj;

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
    contentView=[[UIView alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
    contentView.autoresizingMask=(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
    contentView.autoresizesSubviews=YES;
    contentView.backgroundColor=[UIColor whiteColor];

    tblVw=[[UITableView alloc]initWithFrame:[[UIScreen mainScreen]bounds] style:UITableViewStylePlain];
    tblVw.dataSource=self;
    tblVw.delegate=self;
    tblVw.scrollEnabled=YES;

    array=[[NSMutableArray alloc]init];
    [array addObject:@"Row1"];
    [array addObject:@"Row2"];
    [array addObject:@"Row3"];
    [array addObject:@"Row4"];
    [array addObject:@"Row5"];
    [array addObject:@"Row6"];
    [array addObject:@"Row7"];
    [array addObject:@"Row8"];
    [array addObject:@"Row9"];
    [array addObject:@"Row10"];
    [array addObject:@"Row11"];
    [array addObject:@"Row12"];
    [contentView addSubview:tblVw];
    self.view=contentView;
}

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

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CellIdentifier";

    // Dequeue or create a cell of the appropriate type.
    // UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        [cell.textLabel sizeToFit];
    }
    cell.textLabel.text=[array objectAtIndex:indexPath.row];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    SubViewObj=[[SubView alloc]init];
    [self.view addSubview:SubViewObj.view];
}

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

- (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 {
    [contentView release];
    [SubViewObj release];
    [tblVw release];
    [array release];
    [super dealloc];
}

@end

添加名为subview的视图控制器。这是 subview.h

#import <UIKit/UIKit.h>
@interface SubView : UIViewController <UITableViewDelegate,UITableViewDataSource>
{
    UIView *contentView;
    UITableView *tblVw;
    NSMutableArray *array;
}
@property(nonatomic,retain) UIView *contentView;
@property(nonatomic,retain) UITableView *tblVw;
@property(nonatomic,retain) NSMutableArray *array;
@end

以及 subview.m : #导入“SubView.h” @实现子视图 @合成contentView、tblVw、array;

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
    contentView=[[UIView alloc]initWithFrame:CGRectMake(200, 10, 300, 600)];
    contentView.autoresizingMask=(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
    contentView.autoresizesSubviews=YES;
    contentView.backgroundColor=[UIColor whiteColor];

    tblVw=[[UITableView alloc]initWithFrame:CGRectMake(200, 10, 300, 600) style:UITableViewStylePlain];
    tblVw.dataSource=self;
    tblVw.delegate=self;
    tblVw.scrollEnabled=YES;
    tblVw.layer.borderWidth=4.0;
    tblVw.layer.borderColor=[[UIColor redColor]CGColor];
    array=[[NSMutableArray alloc]init];
    [array addObject:@"Data1"];
    [array addObject:@"Data2"];
    [array addObject:@"Data3"];
    [array addObject:@"Data4"];
    [array addObject:@"Data5"];
    [array addObject:@"Data6"];
    [array addObject:@"Data7"];
    [array addObject:@"Data8"];
    [array addObject:@"Data9"];
    [array addObject:@"Data10"];
    [array addObject:@"Data11"];
    [array addObject:@"Data12"];

    [contentView addSubview:tblVw];
    self.view=contentView;

}

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

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

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

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

    // Dequeue or create a cell of the appropriate type.
    // UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        [cell.textLabel sizeToFit];
    }
    cell.textLabel.text=[array objectAtIndex:indexPath.row];
    return cell;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Overriden to allow any orientation.
    return YES;
}

- (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 {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

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

@end

试试这个代码。这个应用程序是为iPad开发的。根据需要更改iPhone的尺寸。

Gilles 'SO- stop being evil' 13 年前

你必须提到你在哪个表中做操作。例如:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([tableView isEqual:TableView1])
    {
       //do work for tableview1
     }
     else if([tableView isEqual:TableView2])
   {
      //do operations for tableview2
   }
}

Gilles 'SO- stop being evil' 13 年前

cellForRowAtIndexPath . 我必须更改数组名以匹配我的数组,然后将数据源重新连接到文件所有者,然后它开始工作。一定是我的函数代码出了问题。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CellIdentifier";
    // Dequeue or create a cell of the appropriate type.
    // UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        [cell.textLabel sizeToFit];
    }
    cell.textLabel.text=[array objectAtIndex:indexPath.row];
    return cell;
}