iOS: NSDictionary的方法dictionaryWithObjects:forKeys:count:

+ (id)dictionaryWithObjects:(const id[])objects forKeys:(const id <NSCopying >[])keys count:(NSUInteger)count

example:

static const NSInteger N_ENTRIES = 26;

NSDictionary *asciiDict;

NSString *keyArray[N_ENTRIES];

NSNumber *valueArray[N_ENTRIES];

NSInteger i;

 

for (i = 0; i < N_ENTRIES; i++) {

 

    char charValue = 'a' + i;

    keyArray[i] = [NSString stringWithFormat:@"%c", charValue];

    valueArray[i] = [NSNumber numberWithChar:charValue];

}

 

asciiDict = [NSDictionary dictionaryWithObjects:(id *)valueArray

                          forKeys:(id *)keyArray count:N_ENTRIES];