CollectionView [__NSCFConstantString _isResizable]:无法识别的选择器发送到实例

Question

当我运行我的应用程序时,我找到一个信号SIGABRT线程.以下是错误消息:[__ NSCFConstantString _isResizable]:无法识别的选择器发送到实例0x5c20

问题来自[[self myCollectionView] setDataSource:self]; 因为它在评论时消失了.

根据我的理解,myCollectionView数据源和self的类型不一样.这就是我有错误的原因.

谢谢你的帮助

皮埃尔

CalViewController.h

#import <UIKit/UIKit.h>

@interface CalViewController : UIViewController <UICollectionViewDataSource, UICollectionViewDelegate>
@property (weak, nonatomic) IBOutlet UICollectionView *myCollectionView;

@end

CalViewController.m

#import "CalViewController.h"

#import "CustomCell.h" 

@interface CalViewController ()
{
    NSArray *arrayOfImages;
    NSArray *arrayOfDescriptions;
}

@end

@implementation CalViewController

- (void)viewDidLoad
{
[super viewDidLoad];

[[self myCollectionView]setDataSource:self];
[[self myCollectionView]setDelegate:self];

arrayOfImages = [[NSArray alloc]initWithObjects:@"chibre.jpg",nil];
arrayOfDescriptions =[[NSArray alloc]initWithObjects:@"Test",nil];
}
- (NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{ 
return [arrayOfDescriptions count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{ 
    static NSString *cellIdentifier=@"Cell";
    CustomCell *cell =  ([collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath]);

    [[cell myImage]setImage:[arrayOfImages objectAtIndex:indexPath.item]];
    [[cell myDescriptionLabel]setText:[arrayOfDescriptions objectAtIndex:indexPath.item]];

    return cell;
}

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


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

@end

Answer 1

你arrayOfImages是一个图像名称(字符串)数组,所以setImage不适用.代替:

[[cell myImage]setImage:[arrayOfImages objectAtIndex:indexPath.item]];

你可能打算:

[[cell myImage]setImage:[UIImage imageNamed:[arrayOfImages objectAtIndex:indexPath.item]]];

或者,等效地:

cell.myImage.image = [UIImage imageNamed:arrayOfImages[indexPath.item]];

您甚至可能希望重命名arrayOfImages为arrayOfImageNames(或只是imageNames或其他)以消除这种可能的混淆源.

(顺便说一句,这是一个很好的调用,不把实际的图像放在数组中.我们应该总是cellForItemAtIndexPath根据数组中的图像名称创建图像对象.)