Question

我试图学习obj-c，事实是，按照教程，我发现自己＆＃34; CardGameViewer没有可见的@interface声明选择器＆＃39; titleForCard＆＃39;＆＃34;和＆＃34; CardGameViewer没有可见的@interface声明选择器＆＃background; backgroundImageForCard＆＃39;＆＃34; 我不懂。是因为＆＃34; self＆＃34;可能没有参考好东西？

提前致谢。

//CardGameViewController.m

#import "CardGameViewController.h"
#import "PlayingCardDeck.h"
#import "CardMatchingGame.h"

@interface CardGameViewController ()
@property (strong, nonatomic)Deck *deck;
@property (strong, nonatomic)CardMatchingGame *game;
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardButtons;
@end

@implementation CardGameViewController


-(Deck *)createDeck{
    return [[PlayingCardDeck alloc] init];
}

-(CardMatchingGame *)game{
    if(!_game) _game= [[CardMatchingGame alloc]initWitchCardCount:[self.cardButtons count] usingDeck:[self createDeck]];
    return _game;
}


- (IBAction)touchCardButton:(UIButton *)sender {
    int cardIndex = [self.cardButtons indexOfObject:sender];
    [self.game chooseCardAtIndex:cardIndex];
    [self updateUI];
}

-(void)updateUI{
    for (UIButton *cardButton in self.cardButtons){
        int cardIndex = [self.cardButtons indexOfObject:cardButton];
        Card *card= [self.game cardAtIndex:cardIndex];
        [cardButton setTitle:**[self titleForCard]** forState:(UIControlStateNormal)]; //ERROR HERE
        [cardButton setBackgroundImage:**[self backgroundImageForCard]** forState: (UIControlStateNormal)]; //ERROR HERE
        cardButton.enabled = !card.isMatched;
    }
}

- (NSString *)titleForCard:(Card *)card{
    return card.isChosen ? card.contents : @"";
}

- (UIImage *)backgroundImageForCard:(Card *)card{
    return [UIImage imageNamed:card.isChosen ? @"cardFront" : @"cardBack"];
}

@end

Answer 1

这些方法有参数。

您应该像以下一样使用它们：

[cardButton setTitle:[self titleForCard:card] forState:(UIControlStateNormal)];
[cardButton setBackgroundImage:[self backgroundImageForCard:card] forState: (UIControlStateNormal)];

P.S：自我很好，因为你在“自我”中宣称这些方法。

没有可见的@interface for xxxx声明

1 个答案: