Question

我试图从文件中读取的文字如下：＆＃34; DREAM_TITLE：blah blah blah＆＃34;。我遇到的问题是for循环（特别是containsString方法），它一直告诉我DREAM_TITLE键不在那里，当它明显存在并且它甚至被加载到初始数组中时。请哈尔！非常菜鸟，对不起，如果有人冒犯了。谢谢！

-(NSMutableArray *)findValueForKey:(NSString *)key{

NSString *path = [[NSBundle mainBundle] pathForResource:@"sampleData"
                                                 ofType:@"txt"];

NSString *fileContent = [NSString stringWithContentsOfFile:path
                                                  encoding:NSUTF8StringEncoding
                                                     error:NULL];

NSMutableArray *arrayOfKeyValues = [[NSMutableArray alloc] init];

NSArray *numberOfLines = [[NSArray alloc] initWithObjects:[fileContent  componentsSeparatedByString:@"\n"], nil];

for (int i=0; i<[numberOfLines count]; i++){


    if ([[numberOfLines objectAtIndex:i] containsObject:key]){
        NSArray *tempArray = [numberOfLines[i] componentsSeparatedByString:@":"];
        [arrayOfKeyValues insertObject:[tempArray objectAtIndex:1] atIndex:i];
    }

    else {
        [arrayOfKeyValues insertObject:@"no value for key found" atIndex:i];
    }

}

return arrayOfKeyValues;

Answer 1

当原始数组足够时，你已经创建了一个数组数组：

NSArray *numberOfLines = [[NSArray alloc] initWithObjects:[fileContent  componentsSeparatedByString:@"\n"], nil];

这可以简单地说：

NSArray *lines = [fileContent  componentsSeparatedByString:@"\n"];

接下来，要搜索数组中的每一行，只需使用[NSString rangeOfString:]：

for (NSUInteger i = 0; i < [lines count]; i++) {
    if ([lines[i] rangeOfString:key].location != NSNotFound) {
        NSArray *tempArray = [lines[i] componentsSeparatedByString:@":"];
        [arrayOfKeyValues addObject:tempArray[1]];
     } else {
        [arrayOfKeyValues addObject:@"no value for key found"];
     }
}

虽然这不是特别准确，因为您只应在key之前在文本中搜索: ...

用Objective C解析文本文件（containsString :)的问题

1 个答案: