ios - UICollectionView Controller 中的自定义单元格未被调用

Question

我像这样子类化我的 UICollectionViewController 单元格:

-(CategoryScreenCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"cellForItemAtIndexPath load");
    CategoryScreenCell *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];

单元格标识符设置为“MyCell”，自定义单元格类设置为

“类别屏幕单元格”。 “CategoryScreenCell”类:

@implementation CategoryScreenCell

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    NSLog(@"CategoryScreenCell before init");
    if (self) {
        NSLog(@"CategoryScreenCell inside init");
        // Initialization code
        _imageView = [[UIImageView alloc] initWithFrame:self.contentView.bounds];
        [self.contentView addSubview:_imageView];
    }
    return self;
}

我正在使用 Storyboard以及我的 UICollevtionViewController 的委托(delegate)和来源

设置为自己的类(class)。

这是将数据加载到我的 UICollectionView 的方法:

parser.completionBlock = ^(void) {
    if (weakParser.appRecordList) {
        dispatch_async(dispatch_get_main_queue(), ^{
            UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                                     bundle: nil];
            MyCollectionViewController *svc =[mainStoryboard instantiateViewControllerWithIdentifier:@"MainCategory"];
            svc.entries = weakParser.appRecordList;

            NSMutableArray *indexPaths = [[NSMutableArray alloc] init];
            NSIndexPath *indexPath;
            for (int i = 0; i < [weakParser.appRecordList count]; i++) {
                indexPath = [NSIndexPath indexPathForItem:i inSection:0];
                [indexPaths addObject:indexPath];
            }

            [svc.collectionView reloadItemsAtIndexPaths:indexPaths];

        });

    }

    self.queue = nil;
};

我正在为我的 Collection View (RFQuiltLayout) 使用客户布局。

我在我的 Storyboard中将此布局设置为 collectionviewcontroller，以便它获得

带负载初始化。

这是我的 MyCollectionViewController 代码:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.collectionView.delegate = self;
        self.collectionView.dataSource = self;
    }
    return self;
}

    - (void)viewDidLoad
    {

        [super viewDidLoad];
        self.automaticallyAdjustsScrollViewInsets = NO;
       NSLog(@"inside  ");
       NSLog(@"self.entries : %@  ",self.entries);
        UIButton *button_right =  [UIButton buttonWithType:UIButtonTypeCustom];
        [button_right setImage:[UIImage imageNamed:@"setting_btn.png"] forState:UIControlStateNormal];
        [button_right setFrame:CGRectMake(0, 0, 30, 30)];
        SWRevealViewController *revealViewController = self.revealViewController;
        if ( revealViewController )
        {
            [button_right addTarget:self.revealViewController action:@selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];
            [self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
        }
    }

为了测试，我将 nslog 放在大多数地方(blockSizeForItemAtIndexPath ，insetsForItemAtIndexPath , numberOfItemsInSection) 它们都返回值

这是日志文件:

2015-03-07 11:52:46.001 News[9464:919944] numberOfSectionsInCollectionView :1
2015-03-07 11:52:46.001 News[9464:919944] numberOfItemsInSection : 10  
2015-03-07 11:52:46.002 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.005 News[9464:919944] insetsForItemAtIndexPath
2015-03-07 11:52:46.005 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.006 News[9464:919944] insetsForItemAtIndexPath
2015-03-07 11:52:46.006 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.006 News[9464:919944] insetsForItemAtIndexPath
2015-03-07 11:52:46.009 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.009 News[9464:919944] insetsForItemAtIndexPath
2015-03-07 11:52:46.009 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.010 News[9464:919944] insetsForItemAtIndexPath
2015-03-07 11:52:46.010 News[9464:919944] blockSizeForItemAtIndexPath
2015-03-07 11:52:46.010 News[9464:919944] numberOfSectionsInCollectionView load

因为日志显示“CategoryScreenCell”没有被调用。

这是我的整个cellForItemAtIndexPath 方法:

-(CategoryScreenCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"cellForItemAtIndexPath load");
    CategoryScreenCell *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
    UILabel *label = (UILabel *)[myCell.contentView viewWithTag:10];
    UILabel *catlbl = (UILabel *)[myCell.contentView viewWithTag:11];
    UILabel *bglbl = (UILabel *)[myCell.contentView viewWithTag:12];
    NSUInteger nodeCount = [self.entries count];

    if (nodeCount == 0)
    {

    myCell.imageView.image  = [UIImage imageNamed:@"logo.png"];

         myCell.imageView.hidden = YES;
         label.hidden = YES;
         catlbl.hidden = YES;
    }
    if (nodeCount > 0)
    {
        catlbl.hidden=YES;
        AppRecord *appRecord = [self.entries objectAtIndex:indexPath.item];
        if(appRecord.title != NULL)
        {
        label.font = [UIFont fontWithName:@"B Yekan" size:12];
           [label setText:appRecord.title];
            NSLog(@"appRecord.title %@",appRecord.title);
            [bglbl setText:@""];
            [bglbl setBackgroundColor:[UIColor clearColor]];
            CAGradientLayer *gradientLayer = [CAGradientLayer layer];
            gradientLayer.frame = bglbl.bounds;
            gradientLayer.colors = [NSArray arrayWithObjects:(id)[[UIColor colorWithRed:176.0f green:176.0f blue:176.0f alpha:0]CGColor], (id)[[UIColor colorWithRed:0 green:0 blue:0 alpha:1]CGColor], nil];
            [bglbl.layer insertSublayer:gradientLayer atIndex:0];
        }
        NSString *id_tring= [NSString stringWithFormat:@"%@",appRecord.ids];
        [catlbl setText:id_tring];


        if (![appRecord.thumb_url isEqualToString:@""])
        {
            __block UIActivityIndicatorView *activityIndicator;
            __weak UIImageView *weakImageView = myCell.imageView;
            [myCell.imageView sd_setImageWithURL:[NSURL URLWithString:appRecord.thumb_url]
                              placeholderImage:nil
                                       options:SDWebImageProgressiveDownload
                                      progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                                          if (!activityIndicator) {
                                              [weakImageView addSubview:activityIndicator = [UIActivityIndicatorView.alloc initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]];
                                              activityIndicator.center = weakImageView.center;
                                              [activityIndicator startAnimating];
                                          }
                                      }
                                     completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                                         [activityIndicator removeFromSuperview];
                                         activityIndicator = nil;

                                     }];

        }
    }
    myCell.clipsToBounds = YES;
    myCell.layer.masksToBounds = YES;
    myCell.layer.cornerRadius = 6;
    return myCell;
}

我该如何解决这个问题？

Answer 1

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

    return self;
}


-(id)initWithCoder:(NSCoder *)aDecoder

{
   self=[super initWithCoder:aDecoder];

    if (self) {
       [self commonMethod ];
    }
   return self;


}


-(void)commonMethod
{
NSLog(@"CategoryScreenCell before init");
    if (self) {
        NSLog(@"CategoryScreenCell inside init");
    // Initialization code
        _imageView = [[UIImageView alloc]   initWithFrame:self.contentView.bounds];
        [self.contentView addSubview:_imageView];
_imageView.tag=8;
 _label.tag=9;
 _catlbl.tag=10;
 //SO ON..
    }

}

//假设您在“commonMethod”中将标签号设置为 8 给 imageView

 -(CategoryScreenCell *)collectionView:(UICollectionView   *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"cellForItemAtIndexPath load");
    CategoryScreenCell *myCell = [collectionView     dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
UIImageView *imageView = (UIImageView *)[cell viewWithTag:8];
[imageView setImage : @"logo.png"];
[imageview setNeedsLayout];

//comment out the rest of code and try this and check whether image is     seen in the cells

同时将 Storyboard 中的 UICollectionViewCell 类设置为 'yourCustomCollectionViewCell' 类