不能将委托方法分配给 UIViews？

Question

我定义了一个简单的 CollectionView 视图，

当我将委托方法放在 ViewController 中时，单元格会正确显示。但是，当我将它移到 UIView 时，没有调用任何委托方法。

有人知道为什么吗？附上代码。

在 ViewController 中，viewDidLoad 方法，

self.userGrid = [[UserGrid alloc] initWithFrame:self.view.frame];

UserGrid.h

#import <UIKit/UIKit.h>
#import "AvatarViewCell.h"
#import "GridViewLayout.h"

@interface UserGrid : UIView <UICollectionViewDelegate, UICollectionViewDataSource>

@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;

@end

和 UserGrid.m

#import "UserGrid.h"

@implementation UserGrid

- (id)initWithFrame:(CGRect)aRect
{
    UINib *cellNib = [UINib nibWithNibName:@"AvatarViewCell" bundle:nil];
    [self.collectionView registerNib:cellNib forCellWithReuseIdentifier:@"avatarCell"];

    if ((self = [super initWithFrame:aRect])) {
        self.collectionView.dataSource = self;
        self.collectionView.delegate   = self;

        [self.collectionView registerClass:[AvatarViewCell class] forCellWithReuseIdentifier:@"avatarCell"];
    }
    return self;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 12;
}

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

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"avatarCell";

    AvatarViewCell *avatarCell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    [avatarCell.avatarImageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"website_%ld.jpg", indexPath.row + 1]]];

    return avatarCell;
}

@end

** 编辑

我将初始化部分更改为（在 viewDidLoad 中），

self.userGrid = [[[NSBundle mainBundle] loadNibNamed:@"UserGrid" owner:nil options:nil] lastObject];
self.userGrid.frame = self.view.frame;

在 viewDidAppear 中添加，

- (void)viewDidAppear:(BOOL)animated {
    [self.userGrid.collectionView reloadData];
}

添加了 awakeFromNib 方法，但是没有调用委托方法……嗯

- (void)awakeFromNib {
    UINib *cellNib = [UINib nibWithNibName:@"AvatarViewCell" bundle:nil];
    [self.collectionView registerNib:cellNib forCellWithReuseIdentifier:@"avatarCell"];

    NSLog(@"awake");
    self.collectionView.dataSource = self;
    self.collectionView.delegate   = self;

    [self.collectionView registerClass:[AvatarViewCell class] forCellWithReuseIdentifier:@"avatarCell"];
}

Answer 1

像这样初始化 UserGrid 视图

    self.userGrid=[[[NSBundle mainBundle] loadNibNamed:@"yourxibName" owner:nil options:nil] lastObject];
    self.userGrid.frame=self.view.frame;

您有一个 collectionview 的 IBOutlet，但尚未将视图附加到您的类，因此不会初始化集合