Question

我认为我有一个非常简单的任务，但不知何故它不想工作。我是objective-c的初学者，所以我想这只是一个小错误。我仍然不知道我做了什么，目前它更像是复制和粘贴编程。就像我不知道我是否需要在界面中的IBOutlet或作为属性或两者。

我有什么：

具有Button，Label和Table View的ViewController。该按钮连接到共享点服务器并读取列表并将值添加到数组。这部分有效。

Delegate和DataSource出口已连接到View Controller。

我想要的是什么：

数组应该是表视图的数据源，所以我只想在读取数组中的新数据后刷新它。我在viewDidLoad函数中添加到数组的测试数据显示出来。所以我想我以某种方式将数组连接到表视图。

我会给你完整的代码：

ViewController.h：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
    IBOutlet UILabel *output;
    IBOutlet UITableView *tableView;
    NSMutableData *webData;
    NSString *finaldata;
    NSString *convertToStringData;
    NSMutableString *nodeContent;
}
@property (nonatomic, retain) UILabel *output;
@property (nonatomic, weak) IBOutlet UITableView *tableView;
-(IBAction)invokeService:(UIButton *) sender;

@end

ViewController.m：

#import "ViewController.h"

@interface ViewController ()
{
    NSMutableArray *foundUrlaub;
}

@end

@implementation ViewController

@synthesize output;


- (void)viewDidLoad
{
    [super viewDidLoad];

    // SOME TEST DATA... THIS SHOWS UP IN MY TABLE VIEW
    foundUrlaub = [[NSMutableArray alloc]init];
    [foundUrlaub addObject:@"first cell"];
    [foundUrlaub addObject:@"second cell"];
    [foundUrlaub addObject:@"third cell"];
}

-(IBAction)invokeService:(UIButton *) sender
{
    // connection to sharepoint
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"didReceiveResponse");
    [webData setLength:0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"didReceiveData");
    [webData appendData:data];
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"ERROR with the Connection");
    NSLog(error.description);
}

-(BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
    NSLog(@"canAuthenticateAgainstProtectionSpace");
    return YES;
}

-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    NSLog(@"didReceiveAuthenticationChallenge");
    NSURLCredential *credential = [NSURLCredential credentialWithUser:@"XXXXXX" password:@"XXXXXX" persistence:NSURLCredentialPersistenceForSession];
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"DONE. Received Bytes: %d", [webData length]);
    convertToStringData = [[NSString alloc] initWithData:webData encoding:NSUTF8StringEncoding];

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?<=ows_Title=')(.*)(?=' ows_MetaInfo)" options:0 error:NULL];

    NSArray *matches = [regex matchesInString:convertToStringData options:0 range:NSMakeRange(0, [convertToStringData length])];

    // HERE I LOAD SOME DATA IN THE ARRAY
    [foundUrlaub removeAllObjects];
    for (NSTextCheckingResult *match in matches)
    {
        NSRange matchRange = [match rangeAtIndex:1];
        NSString *matchString = [convertToStringData substringWithRange:matchRange];
        NSLog(@"Match: %@", matchString);
        [foundUrlaub addObject:matchString]; // <- ADDS 3 STRINGS TO ARRAY
    }

    // THIS DOES NOT WORK!
    [tableView reloadData];

}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

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

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
    }

    cell.textLabel.text = [foundUrlaub objectAtIndex:indexPath.row];
    return cell;
}

@end

Answer 1

尝试使用[_tableView reloadData];您在.m中没有@synthesize您的tableView，因此您必须使用自动合成标识符

Answer 2

您的代码看起来很好，

确保

适用于tableView的IBOutlet正确连接
来自nib的数据源和代理已连接到文件所有者

A must watch and a must read for you

Answer 3

您必须将Interfacebuilder中的Outlet连接到UITableview tableView。

Answer 4

您正在尝试从单独的线程重新加载表。所以UIView只能从主线程更改，所以做这样的事情：

[tableView performSelectorOnMainThread:@selector(reloadData)
                            withObject:nil
                         waitUntilDone:YES];

刷新表视图？

4 个答案: