Question

这是我的代码，我目前如何从Dictionary数组中访问该数据，但我知道有简单的优化代码可以做到这一点。我是ios的新手

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"description LIKE[cd] 'CallCenterPhoneNumber' "];
NSArray *PhoneNumberArrary = [tblData filteredArrayUsingPredicate:predicate];
NSDictionary *item = [PhoneNumberArrary objectAtIndex:0];
phoneNumber=[item objectForKey:@"value"];
NSLog(@"%@",phoneNumber);
predicate = [NSPredicate predicateWithFormat:@"description LIKE[cd] 'CallCenterEmailAddress' "];
NSArray *EmailArrary = [tblData filteredArrayUsingPredicate:predicate];
NSDictionary *item1 = [EmailArrary objectAtIndex:0];
EmailAddress=[item1 objectForKey:@"value"];
NSLog(@"%@",EmailAddress);
//and this is my array of Dictionary.
(
    {
    description = CallCenterPhoneNumber;
    id = 0;
    value = 123;
    },
    {
    description = CallCenterEmailAddress;
    id = 1;
    value = "email@domain.com";
     },
)

Answer 1

for (NSDictionary *dictionary in tblData) {
    if ([dictionary.description rangeOfString:@"CallCenterPhoneNumber" options:NSCaseInsensitiveSearch].location != NSNotFound) {
        phoneNumber = dictionary;
    } else  if ([dictionary.description rangeOfString:@"CallCenterEmailAddress" options:NSCaseInsensitiveSearch].location != NSNotFound) {
        emailAddress = dictionary;
    }
}

Answer 2

您可以使用for ( ... in ... )循环遍历数组的每个条目，并使用简化的语法从每个字典中提取信息。例如，如果entry是指向字典的指针，那么

entry[@"description"];

相当于

[entry objectForKey:@"description"];

    id phoneNumber = nil;
    id emailAddress = nil;

    for ( NSDictionary *entry in array )
    {
        NSString *description = entry[@"description"];

        if ( [description isEqualToString:@"CallCenterPhoneNumber"] )
            phoneNumber = entry[@"value"];
        else if ( [description isEqualToString:@"CallCenterEmailAddress"] )
            emailAddress = entry[@"value"];
    }

    NSLog( @"%@", phoneNumber );
    NSLog( @"%@", emailAddress );

不使用NSPredicate我想从字典数组中获取数据

2 个答案: