ios - 无法在我的 View Controller 中看到 Collection View

Question

我正在尝试在 Collection View 中显示 Twitter 提要。我能够以正常的表格布局显示 Twitter 提要，但是当我尝试在 Collection View 中显示它时，我的 View Controller 中没有显示任何内容。我将一个 View 拖到我的 View Controller 中，并将一个 Collection View 拖到我的 View 中。这是我的 Storyboard的 View :

 viewcontroller->View-> View1 ->CollectionView -> CollectionViewCell-> Label,ImageView

我的 View Controller 中有两个 View 。一个用于我的 ListView ，另一个用于 Collection View 。我不确定我在这里错过了什么。你能帮我做这件事吗？

提前致谢。这是我的文件:

TweetCell.h

 #import <UIKit/UIKit.h>

 @interface TweetCell : UICollectionViewCell

 @property (weak, nonatomic) IBOutlet UIImageView *imageTweet;
 @property (weak, nonatomic) IBOutlet UILabel *textTweet;

 @end

TweetCell.m

 #import "TweetCell.h"

  @implementation TweetCell

  @synthesize textTweet,imageTweet;

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

    // Initialization code
    NSArray *arrayOfViews = [[NSBundle mainBundle] loadNibNamed:@"CellID" owner:self options:nil];

    if ([arrayOfViews count] < 1) {
        return nil;
    }

    if (![[arrayOfViews objectAtIndex:0] isKindOfClass:[UICollectionViewCell class]]) {
        return nil;
    }

    self = [arrayOfViews objectAtIndex:0];

}
return self;

}
@end

ViewController.h

   #import <UIKit/UIKit.h>
   @interface ViewController :   UIViewController<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>{
IBOutlet UICollectionView *collectionViewTwitter;

}
@end

ViewController.m

#import "ViewController.h"
#import "STTwitter.h"
#import "TweetCell.h"

 @interface ViewController ()

@property (strong, nonatomic) NSMutableArray *twitterFeedList;

@end


- (void)viewDidLoad
{
    [super viewDidLoad];
    /* uncomment this block to use subclassed cells */
    [self->collectionViewTwitter registerClass:[TweetCell class] forCellWithReuseIdentifier:@"cvCell"];
    /* end of subclass-based cells block */

    // Configure layout
    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    [flowLayout setItemSize:CGSizeMake(200, 200)];
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
    [self->collectionViewTwitter setCollectionViewLayout:flowLayout];

    STTwitterAPI *twitter = [STTwitterAPI twitterAPIAppOnlyWithConsumerKey:@"xz9ew8UZ6rz8TW3QBSDYg"
                                                            consumerSecret:@"rm8grg0aIPCUnTpgC5H1NMt4uWYUVXKPqH8brIqD4o"];

    [twitter verifyCredentialsWithSuccessBlock:^(NSString *bearerToken) {

        [twitter getUserTimelineWithScreenName:@"MYTwitterUserName"
                                  successBlock:^(NSArray *statuses) {

                                      self.twitterFeedList = [NSMutableArray arrayWithArray:statuses];

                                      [self->collectionViewTwitter reloadData];

                                  } errorBlock:^(NSError *error) {

                                      NSLog(@"%@", error.debugDescription);

                                  }];

    } errorBlock:^(NSError *error) {

        NSLog(@"%@", error.debugDescription);

    }];

 }

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

    return  self.twitterFeedList.count;

}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

           static NSString *cellID =  @"CellID" ;

            NSInteger idx = indexPath.row;
            NSDictionary *t = self.twitterFeedList[idx];



    /* Uncomment this block to use subclass-based cells */
    TweetCell *cell = (TweetCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath];
    cell.textTweet.adjustsFontSizeToFitWidth=YES;
     cell.textTweet.numberOfLines=4;
    cell.textTweet.text=t[@"text"];

    cell.imageTweet.image=[UIImage imageNamed:@"twitter.png"];

    /* end of subclass-based cells block */

    // Return the cell
    return cell;

}

Answer 1

您需要确保 Collection View 的数据源和委托(delegate)已连接到文件的所有者。为此，请单击 xib/storyboard 文件中的 Collection View 。然后在右侧的连接检查器中，单击并从数据源拖动到文件所有者。对代表做同样的事情。这样 Collection View 就知道向谁请求 Collection View 的实现。或者，你可以做 self.collectionView.delegate = self和 self.collectionView.datasource = self在viewDidLoad或 viewWillAppear假设你已经从 xib/storyboard 文件中连接了你的 IBOutlet