我在调用NSDictionary后得到一些不相关的答案

Question

我试过下面的代码:

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

NSString * str1 = @"program";
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];
NSMutableDictionary * numToAlpha = [NSMutableDictionary dictionary];
NSInteger index =0;
int shifter = 5;
for(NSString * character in alphabets){
    index++;
    [alphaToNum setObject:[NSNumber numberWithInteger:index] forKey:character];
    [numToAlpha setObject:character forKey:[NSNumber numberWithInteger:index]];
}
NSRange * rng = {0,0};
NSLog(@"-------");
//NSLog(@"%@" , [str1 substringWithRange:NSMakeRange(1, 1)]);
for(int i=0;i<[str1 length];i++)
{   
    NSString * ss = [str1 substringWithRange:NSMakeRange(i, 1)];
    NSInteger  i = [alphaToNum valueForKey:ss];
    i = (i + 5);
            NSLog(@"%d",i); //last code
}

这是我得到的最后一个代码

2011-10-24 13:20:08.289 cipher[22732:a0f] 1103808

2011-10-24 13:20:08.290 cipher[22732:a0f] 1101168

2011-10-24 13:20:08.290 cipher[22732:a0f] 1103200

2011-10-24 13:20:08.290 cipher[22732:a0f] 1103616

2011-10-24 13:20:08.291 cipher[22732:a0f] 1103584

甚至有时

"EXC_BAD_ACCESS"

。

是完全错误的!

Answer 1

NSInteger  i = [alphaToNum valueForKey:ss];

这将返回一个NSNumber对象，而不是NSInteger。

将该行写成如下，

NSInteger  i = [[alphaToNum valueForKey:ss] integerValue];

关于崩溃，我们只能在查看崩溃日志后才能回答。那样会更有帮助。