可以在Objective-C上打开NSString吗? [英] Can Objective-C switch on NSString?

问题描述

是否有更智能的方式来重写它?

Is there a more intelligent way to rewrite this?

if ([cardName isEqualToString:@"Six"]) {
    [self setValue:6];
} else if ([cardName isEqualToString:@"Seven"]) {
    [self setValue:7];
} else if ([cardName isEqualToString:@"Eight"]) {
    [self setValue:8];
} else if ([cardName isEqualToString:@"Nine"]) {
    [self setValue:9];
} 

推荐答案

不幸的是，他们不能.这是使用switch语句的最佳方式和最受欢迎的方法之一，因此希望他们跳上(现在)Java(和其他)潮流！

Unfortunately they cannot. This is one of the best and most sought after utilizations of switch statements, so hopefully they hop on the (now) Java (and others) bandwagon!

如果要输入卡名，则可以为每个卡对象分配一个整数值，然后将其打开.也许是一个枚举，它被认为是一个数字，因此可以打开.

If you are doing card names, perhaps assign each card object an integer value and switch on that. Or perhaps an enum, which is considered as a number and can therefore be switched upon.

例如

typedef enum{
  Ace, Two, Three, Four, Five ... Jack, Queen, King

} CardType;

这样，Ace等于情况0，两个等于情况1，依此类推.

Done this way, Ace would be be equal to case 0, Two as case 1, etc.

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