iphone - 从 NSDictionary 我只得到 0 或 null 我该怎么办？

Question

这是我的代码

NSArray * alphabets = [NSArray arrayWithObjects:@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",@"i",@"j",@"k",@"l",@"m",@"n",@"o",@"p",@"q",@"r",@"s",@"t",@"u",@"v",@"w",@"x",@"y",@"z",nil];
NSMutableDictionary * alphaToNum = [NSMutableDictionary dictionary];

NSInteger index =0;

for (NSString * character in alphabets) {

    index++;
    [alphaToNum setObject:character forKey:[NSNumber numberWithInteger:index]];
}

NSLog(@"%@",[alphaToNum objectForKey:@"d"]);

每次我尝试为我的 key 获取一些值时，我只得到 0 。

Answer 1

你需要...

NSLog(@"%@",[alphaToNum objectForKey:[NSNumber numberWithInteger:[alphabets indexOfObject:@"d"]]]);