Question

我遇到的问题是我想按顺序解析字符串，例如，解析“一三二”，将其添加到另一个字符串，并打印“一三二”。我正在使用rangeOfString:，但是当我解析该字符串时，它返回“一二三”。我知道在我的情况下解析的顺序是if语句的位置，但是我如何按顺序解析该字符串？这是我的代码：

NSString *string = @"one three two";
NSString *newString;

if ([string rangeOfString:@"one"].location != NSNotFound)
{
    newString = [newString stringByAppendingString:@"one"];
}
if ([string rangeOfString:@"two"].location != NSNotFound)
{
    newString = [newString stringByAppendingString:@"two"];
}
if ([string rangeOfString:@"three"].location != NSNotFound)
{
    newString = [newString stringByAppendingString:@"three"];
}

NSLog(@"%@",newString);

Answer 1

你做错了，你应该使用componentsSeparatedByString:并排序：

NSString *stringWithNumbersOrdered(NSString *input)
{
    static NSArray *numberStrings = nil;

    if (!numberStrings)
    {
        numberStrings = [NSArray arrayWithObjects:@"zero", @"one", @"two", @"three", @"four", @"five", @"six", @"seven", @"eight", @"nine", /* etc. */ nil];
    }

    NSArray *components = [input componentsSeparatedByString:@" "];
    NSArray *componentsSorted = [components sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        int value1 = [numberStrings indexOfObject:obj1];
        int value2 = [numberStrings indexOfObject:obj2];

        return value1 - value2;
    }];

    return [componentsSorted componentsJoinedByString:@" "];
}

使用rangeOfString按顺序解析：

1 个答案: