“No known class method for selector'validSuits'” xCode 5.1中出现错误 [英] "No known class method for selector 'validSuits'" Error in xCode 5.1
问题描述
我想跟着一个斯坦福CS193p课程,但我得到一个客观的C错误,我不能解决。
I'm trying to follow along with a Stanford CS193p course, but I'm getting an objective C error that I cannot resolve.
我得到在包含[PlayingCard validSuits]的行上的 PlayingCardDeck.m
文件中出现错误。
I'm getting the error in the below PlayingCardDeck.m
file on the line that contains "[PlayingCard validSuits]".
#import "PlayingCard.h"
#import "PlayingCardDeck.h"
@implementation PlayingCardDeck
- (instancetype)init {
self = [super init];
if (self){
for (NSString *suit2 in [PlayingCard validSuits]) { //Error on this line
}
}
return self;
}
@end
这里是PlayingCardDeck.h档案:
Here is the PlayingCardDeck.h file:
#import "Deck.h"
@interface PlayingCardDeck : Deck
@end
这是 PlayingCard.m
档案:
#import "PlayingCard.h"
@implementation PlayingCard
- (NSString *)contents {
NSArray *rankStrings = [PlayingCard rankStrings];
return [rankStrings[self.rank] stringByAppendingString:self.suit];
}
+ (NSArray *)validSuits {
return @[@"♣︎", @"♠︎", @"♥︎", @"♦︎"];
}
@synthesize suit = _suit;
- (void)setSuit:(NSString *)suit {
if ([[PlayingCard validSuits] containsObject:suit]) {
_suit = suit;
}
}
- (NSString *)suit {
return _suit ? _suit : @"?";
}
+ (NSArray *)rankStrings {
return @[@"?", @"A", @"2", @"3", @"4", @"5",
@"6", @"7", @"8", @"9", @"10", @"J",
@"Q", @"K"];
}
+ (NSUInteger)maxRank {
return [[self rankStrings] count] - 1;
}
- (void)setRank:(NSUInteger)rank {
if (rank <= [PlayingCard maxRank]) {
_rank = rank;
}
}
@end
$ c> PlayingCard.h 档案:
And the PlayingCard.h
file:
#import "Card.h"
@interface PlayingCard : Card
@property (strong, nonatomic) NSString *suit;
@property (nonatomic) NSUInteger rank;
+ (NSArray *)validSuits;
+ (NSUInteger)maxRank;
@end
我刚接触目标C,不知道是什么原因问题。或者为什么相同的代码可以为一个人工作,而不是为我。任何帮助是赞赏。
I'm new to objective C and have no idea what is causing this problem. Or why identical code can work for one person and not for me. Any help is appreciated.
推荐答案
我看不到任何问题的代码。
I cannot see any problems of the code.
您可以尝试清除构建并重新构建它。
You can try clean your build and re-build it.
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