Question

我有一个子视图，我在其中构建了一个UITableview，我已将委托和数据源设置为子视图但由于某种原因没有调用表方法...有人可以查看我的代码并看看是什么我做错了？感谢

.h文件

@interface TwitterController : UIView <UITableViewDelegate, UITableViewDataSource> { 

UIButton* btnCloseView; 
UITableView* tblTweets;
UIImageView* imgTwitterIcon;

ColorController* colorManager;

NSMutableArray* tweetsArray;
NSMutableArray* tableData;

NSString* twitterID;

}

@property (nonatomic, retain) NSString* twitterID;

- (NSMutableArray* ) getTweets; 

- (void) sendNotification : (id) sender;

@end

.m文件

#import "TwitterController.h"

@implementation TwitterController

@synthesize twitterID;

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {

    colorManager = [ColorController new];

}
return self;
}


/*- (void)drawRect:(CGRect)rect {



}*/

- (void)layoutSubviews { 

imgTwitterIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"imgTwitterBird"]];
CGRect twitterIconFrame = [imgTwitterIcon frame];
twitterIconFrame.origin.x = 50.0;
twitterIconFrame.origin.y = 20.0;

tblTweets = [[UITableView alloc] initWithFrame:CGRectMake(50.0, 25.0, 220.0, 500.0)];
tblTweets.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
tblTweets.separatorColor = [colorManager setColor:176.0:196.0:222.0];
tblTweets.layer.borderWidth = 1.0;
tblTweets.rowHeight = 20.0;
tblTweets.scrollEnabled = YES;
tblTweets.delegate = self;
tblTweets.dataSource = self;

tableData = [self getTweets];

UIImage* imgCloseButton = [UIImage imageNamed:@"btnCloseWindow.png"];
CGSize imageSize = imgCloseButton.size;
btnCloseView = [[UIButton alloc] initWithFrame: CGRectMake(220.0, 550.0, imageSize.width, imageSize.height)];
[btnCloseView setImage:[UIImage imageNamed:@"btnCloseWindow.png"] forState:UIControlStateNormal];
[btnCloseView addTarget:self action:@selector(sendNotification:) forControlEvents:UIControlEventTouchUpInside];


[self addSubview:tblTweets];
[self addSubview:imgTwitterIcon];
[self addSubview:btnCloseView];
}

- (NSMutableArray*) getTweets { 

//array to hold tweets
tweetsArray = [[NSMutableArray alloc] init];

twitterID = @"Pruit_Igoe";

///set up a NSURL to the twitter API
NSURL* twitterAPI = [NSURL URLWithString:[NSString stringWithFormat:@"https://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&include_rts=true&screen_name=%@&count=10", twitterID]];

//get last 10 tweets (max is 20)
TWRequest *twitterRequest = [[TWRequest alloc] initWithURL:twitterAPI 
            parameters:nil requestMethod:TWRequestMethodGET];

// Notice this is a block, it is the handler to process the response
[twitterRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
    if ([urlResponse statusCode] == 200)  {

        // The response from Twitter is in JSON format
        // Move the response into a dictionary and print
        NSError *error;        
        NSDictionary *tweetsDict = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];

        for(NSDictionary* thisTweetDict in tweetsDict) { 

            [tweetsArray addObject:[thisTweetDict objectForKey:@"text"]];
        }

    }
    else
        NSLog(@"Twitter error, HTTP response: %i", [urlResponse statusCode]);
}];

return tweetsArray;


}

#pragma mark Table Management

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [tableData count];
NSLog(@"%i", [tableData count]); //does not log!
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

static NSString *CellIdentifier = @"tableCell";

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

cell.textLabel.textColor = [UIColor colorWithRed:66.0/255.0 green:66.0/255.0 blue:66.0/255.0 alpha:1];
cell.textLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size: 13.0];
cell.textLabel.text = [tweetsArray objectAtIndex:indexPath.row];
CGRect cellFrame = [cell frame];
cellFrame.size.height = 25.0;

return cell;

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

NSString* thisTweet = [tableData objectAtIndex:indexPath.row];
}

#pragma mark Close Window

- (void) sendNotification : (id) sender { 

NSMutableDictionary* userData = [[NSMutableDictionary alloc] init];

[userData setObject:@"closeTwitter" forKey:@"theEvent"];

[[NSNotificationCenter defaultCenter] postNotificationName:@"theMessenger" object:self userInfo: userData];

}

@end

Answer 1

我认为你没有分配和初始化tableData。用tableData = [[NSMutableArray alloc] init];方法或- (id)initWithFrame:(CGRect)frame方法将其- (void)layoutSubviews写下来。试试吧。

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
NSLog(@"%i", [tableData count]);
return [tableData count];
//NSLog(@"%i", [tableData count]); //does not log!
}

如果输出为零，则tableData数组为空。检查tableData数组

Answer 2

您应该在tblTweets中执行所有初始化（例如initWithFrame:。

layoutSubviews用于布置子视图。

事实上，如果将所有代码fromLayoutSubviews移至initWithFrame:，您的代码将（应该）有效。然后，您可以移回部分代码（布局部分）。

编辑：当您移动初始化代码时，您可能还需要在[tblTweets reloadData];之后添加tableData = [self getTweets];

UITableView - 没有调用方法

2 个答案: