使用block来解决实现switch解决字符串

NSString *lookup=@"Hearts";

typedef void  (^CaseBlock)();

NSDictionary *diction=@{@"Diamonds":

^(){

NSLog(@"Riches");

},

@"Clubs":

^(){

NSLog(@"Clubs");

},

@"Spades":

^(){

NSLog(@"Spades");

},

@"Hearts":

^(){

NSLog(@"Hearts!");

}

};

( (CaseBlock) diction[lookup])();