将子视图添加到UICollectionViewCell子类？

Question

我似乎无法将子视图添加到我的UICollectionViewCell子类中的视图中。

我有一个抽象UICollectionViewCell子标题MessageItem，它看起来像这样：

我创建了这个继承了几类（因为它们都使用相同的逻辑页眉和页脚）。不过，我似乎无法在子子类中为MessageItem的蓝色视图添加子视图。

例如，其中一个子视图叫做TextItem。我试图添加一个标签到它的父级messageView（蓝色视图），但它只适用于我在我的UIViewController的cellForItemAtIndexPath:(NSIndexPath *)indexPath方法中，而不是在我的自定义子类中。

这是我正在努力将其添加到我的孩子子类：

- (instancetype)initWithFrame:(CGRect)frame { 

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

     //Setup Message Label 
     [self setupMessageLabel]; 
    } 

    return self; 
} 

#pragma mark - Setup Methods 

- (void)setupMessageLabel { 

    NSLog(@"Setting up label"); 

    //Setup Message Label 
    self.messageLabel = [TTTAttributedLabel new]; 
    self.messageLabel.verticalAlignment = TTTAttributedLabelVerticalAlignmentCenter; 
    self.messageLabel.textInsets = UIEdgeInsetsMake(8, 8, 8, 8); 
    self.messageLabel.numberOfLines = 0; 
    [self.messageContentView addSubview:self.messageLabel]; 
    [self.messageContentView autoPinEdgesToSuperviewEdges]; 

    //Update Label Color 
    self.messageLabel.backgroundColor = FlatRed; 
} 

注：我没有使用故事板或xibs。这可能是问题吗？

更新

这是我的MessageItem类实现：

MessageItem.h

#import <UIKit/UIKit.h> 

@class Message; 

@interface MessageItem : UICollectionViewCell 

@property (nonatomic, strong) Message *message; 
@property (nonatomic, strong) UIView *messageContentView; 

@end 

MessageItem.m

@interface MessageItem() 

@property (nonatomic, strong) TTTAttributedLabel *headerLabel; 
@property (nonatomic, strong) TTTAttributedLabel *footerLabel; 

@end 

@implementation MessageItem 
@synthesize message = _message; 

- (instancetype)initWithFrame:(CGRect)frame { 

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

     //Setup Main View 
     [self setupMainView]; 
    } 

    return self; 
} 

#pragma mark - Setup Methods 

- (void)setupMainView { 

    //Setup Header 
    [self setupHeaderLabel]; 

    //Setup Message 
    [self setupMessageView]; 

    //Setup Footer View 
    [self setupFooterLabel]; 
} 

- (void)setupHeaderLabel { 

    //Setup Header Label 
    self.headerLabel = [[TTTAttributedLabel alloc] initForAutoLayout]; 
    self.headerLabel.font = [UIFont fontWithName:@"Lato-Bold" size:12.0]; 
    self.headerLabel.textColor = FlatGray; 
    self.headerLabel.textAlignment = NSTextAlignmentCenter; 
    self.headerLabel.verticalAlignment = TTTAttributedLabelVerticalAlignmentCenter; 
    self.headerLabel.textInsets = UIEdgeInsetsMake(0, 8, 0, 8); 
    self.headerLabel.backgroundColor = FlatPurple; 
    [self.contentView addSubview:self.headerLabel]; 
    [self.headerLabel autoSetDimension:ALDimensionHeight toSize:20.0]; 
    [self.headerLabel autoPinEdgesToSuperviewEdgesWithInsets:UIEdgeInsetsZero excludingEdge:ALEdgeBottom]; 
} 

- (void)setupMessageView { 

    //Setup Message View 
    self.messageContentView = [UIView new]; 
    self.messageContentView.backgroundColor = [UIColor blueColor]; 
    [self.contentView addSubview:self.messageContentView]; 
    [self.messageContentView autoSetDimension:ALDimensionHeight toSize:30 relation:NSLayoutRelationGreaterThanOrEqual]; 
    [self.messageContentView autoPinEdgeToSuperviewEdge:ALEdgeLeading]; 
    [self.messageContentView autoPinEdgeToSuperviewEdge:ALEdgeTrailing]; 
    [self.messageContentView autoPinEdge:ALEdgeTop toEdge:ALEdgeBottom ofView:self.headerLabel]; 
} 

- (void)setupFooterLabel { 

    //Setup Footer Label 
    self.footerLabel = [[TTTAttributedLabel alloc] initForAutoLayout]; 
    self.footerLabel.font = [UIFont fontWithName:@"Lato-Bold" size:10.0]; 
    self.footerLabel.textColor = FlatGray; 
    self.footerLabel.backgroundColor = FlatGreen; 
    self.footerLabel.textAlignment = NSTextAlignmentLeft; 
    self.footerLabel.textInsets = UIEdgeInsetsMake(0, 8, 0, 8); 
    [self.contentView addSubview:self.footerLabel]; 
    [self.footerLabel autoSetDimension:ALDimensionHeight toSize:10.0]; 
    [self.footerLabel autoPinEdgeToSuperviewEdge:ALEdgeLeading]; 
    [self.footerLabel autoPinEdgeToSuperviewEdge:ALEdgeTrailing]; 
    [self.footerLabel autoPinEdgeToSuperviewEdge:ALEdgeBottom]; 
    [self.footerLabel autoPinEdge:ALEdgeTop toEdge:ALEdgeBottom ofView:self.messageContentView]; 
} 

TextItem.m

- (instancetype)initWithFrame:(CGRect)frame { 

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

     //Setup Message Label 
     [self setupMessageLabel]; 
    } 

    return self; 
} 


#pragma mark - Setup Methods 

- (void)setupMessageLabel { 

    //Setup Message Label 
    self.messageLabel = [[TTTAttributedLabel alloc] initWithFrame:CGRectMake(0, 0, 320, 100)]; 
    self.messageLabel.verticalAlignment = TTTAttributedLabelVerticalAlignmentCenter; 
    self.messageLabel.textInsets = UIEdgeInsetsMake(8, 8, 8, 8); 
    self.messageLabel.numberOfLines = 0; 
    [self.messageContentView addSubview:self.messageLabel]; 

    //Update Label Color 
    self.messageLabel.backgroundColor = FlatRed; 
} 

#pragma mark - Setter Methods 

- (void)setMessageText:(NSString *)text { 

    //Incoming Text Message 
    NSMutableAttributedString *textString = [[NSMutableAttributedString alloc] initWithString:text]; 
    [textString addAttribute:NSForegroundColorAttributeName value:[UIColor darkGrayColor] range:NSMakeRange(0, textString.length)]; 
    [textString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16 weight:UIFontWeightLight] range:NSMakeRange(0, textString.length)]; 

    //Set Paragraph Style 
    NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new]; 
    paragraphStyle.minimumLineHeight = 20; 
    paragraphStyle.maximumLineHeight = 20; 
    [textString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, textString.length)]; 

    //Update Message Label 
    [self.messageLabel setText:textString]; 

    NSLog(@"Set Message Label Text"); 
} 

- (void)setMessage:(Message *)message { 

    //Super 
    [super setMessage:message]; 

    //Update Message Text 
    [self setMessageText:message.text]; 
} 

这是我的CollectionView是什么样子：

我至少会想到messageLabel的颜色，以反映TextItem的变化，但它不“T。

Answer 1

您是否实施initWithCoder？

- (id)initWithCoder:(NSCoder*)aDecoder 
{ 
    if(self = [super initWithCoder:aDecoder]) { 
     // Do something 
    } 
    return self; 
} 

我没有你所有的代码，但你的代码对我来说看起来不错。也许问题在于你如何初始化TextItem。

这是一个使用你的代码的演示，它适用于我。 https://www.dropbox.com/s/7qp9ayqnyacf57j/CustomCellView.zip?dl=0