Question

我正在处理一个非常基本的问题，我需要比较两个字典键，但是当我这样做时，它并没有给我正确的答案，不知怎的，我没有创建逻辑。

所以我有一个plist数组的字典和json数组从服务器传入如果plist中存在事件，如果不做其他事情，我想比较它们;

问题：
根据我的逻辑，如果plist中的两个事件等于来自服务器的其他两个事件，如果每个来自服务器的字典应该打印逻辑，那么在这种情况下总共2次，但在我的代码中它被打印4次。基本上它每次都满足条件。

的NSLog：

evreka find the id
evreka find the id
evreka find the id
evreka find the id

来源： 在一个plist;

createList (
        {
        "end_date" = "2013-07-24";
        ends = "13:07:00";
        "event_id" = 173;
        "event_name" = Static;
        location = Asdad;
        "root_folder" = "dadapof@gmail.com";
        "start_date" = "2013-07-24";
        starts = "13:07:00";
        "user_id" = 13;
    },
        {
        "end_date" = "2013-07-25";
        ends = "13:08:00";
        "event_id" = 174;
        "event_name" = "Event Delete";
        location = Asdsad;
        "root_folder" = "dadapof@gmail.com";
        "start_date" = "2013-07-25";
        starts = "13:08:00";
        "user_id" = 13;
    }
)

此服务器来自

responseobj (
        {
        "end_date" = "2013-07-24";
        ends = "13:07:00";
        "event_id" = 173;
        "event_name" = Static;
        location = Asdad;
        "root_folder" = "dadapof@gmail.com";
        "start_date" = "2013-07-24";
        starts = "13:07:00";
        "user_id" = 13;
    },
        {
        "end_date" = "2013-07-25";
        ends = "13:08:00";
        "event_id" = 174;
        "event_name" = "Event Delete";
        location = Asdsad;
        "root_folder" = "dadapof@gmail.com";
        "start_date" = "2013-07-25";
        starts = "13:08:00";
        "user_id" = 13;
    }
)

代码：

比较代码;

if ([[NSFileManager defaultManager] fileExistsAtPath:dataPath]){
        createList= [NSMutableArray arrayWithContentsOfFile:dataPath];
        NSLog(@"createList %@",createList);
        NSLog(@"responseobj %@",responseObj);


        //compare plist and response object
        for (int i=0; i<[responseObj count]; i++) {
            NSDictionary *dataDict = [responseObj objectAtIndex:i];

            NSString *event_name =[dataDict objectForKey:@"event_name"];
            //NSString *event_id =[dataDict objectForKey:@"event_id"];

            BOOL eventExistInPlist=NO;


            for (int j=0; j<[createList count]; j++) {
                NSDictionary *createDict = [createList objectAtIndex:i];

                //NSString *create_id =[createDict objectForKey:@"event_id"];
                NSNumber *create_id =[createDict objectForKey:@"event_id"];

                if ([[dataDict objectForKey:@"event_id"] isEqual:[createDict objectForKey:@"event_id"]]) {
               // if (create_id==event_id) {
                    NSLog(@"evreka find the id");

我尝试了什么： 我试图将它们比作字符串（isEqualtoString），数字（==）和isEqual：方法，它们都失败了。

我做错了什么？

Answer 1

在

 NSDictionary *createDict = [createList objectAtIndex:i];
                                                      ^----- HERE

您使用了错误的索引，内循环应该是j而不是i。

Answer 2

Martin R的回答是您的问题所在。我会改变你的逻辑虽然包括Objective-C快速枚举而不是++循环的标准。我还将第二个for循环分离为BOOL方法以便于阅读

for (NSDictionary *dataDict in responseObj) {
    NSString *event_name =[dataDict objectForKey:@"event_name"];
    if ([self matchFoundForEventId:event_name]) {
        NSLog(@"Match found");
    }
}

-(BOOL)matchFoundForEventId:(NSString *)eventId {
    for (NSDictionary *dataDict in createList) {
        NSString *createEvent = [dataDict objectForKey:@"event_id"];
        if ([eventId isEqualToString:createEvent]) {
            return YES;
        }
    }
    return NO;
}

NSDictionary密钥比较失败

2 个答案: