Question

我想从我的项目的plist文件中获取应该排序的数据。现在我的plist看起来像

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <dict>
        <key>code</key>
        <string>AF</string>
        <key>phone_code</key>
        <string>93</string>
        <key>name</key>
        <string>Afghanistan</string>
    </dict>
    <dict>
        <key>code</key>
        <string>AL</string>
        <key>phone_code</key>
        <string>355</string>
        <key>name</key>
        <string>Albania</string>
    </dict>

等等到最后一个国家。我正在获取这样的数据

 NSString* path = [[NSBundle mainBundle] pathForResource:@"CountriesWithPhoneCodes" ofType:@"plist"];
    NSArray* a = [NSArray arrayWithContentsOfFile:path];
    for (NSDictionary *d in a)
    {
        NSString *cdate = [d objectForKey:@"CDate"];
        if ([cdate isEqualToString:@"Whatever is currently selected"])
        {
            NSString *text = [d objectForKey:@"Text"];
            // do something with text here
        }
    }

    NSDictionary *dict = [[NSDictionary alloc]init];
    dict = [self indexKeyedDictionaryFromArray:a];

    NSLog(@"This is %@",[[dict allValues]objectAtIndex:0]);

我得到的输出是

This is {
    code = AF;
    name = Afghanistan;
    "phone_code" = 93;
}

我无法正常访问数据。如何创建一个字典，其中phone_code为值和国家/地区名称作为键。

Answer 1

NSPredicate完全符合您的需求。

NSString *path = [[NSBundle mainBundle] pathForResource:@"CountriesWithPhoneCodes" ofType:@"plist"];
NSArray *array = [NSArray arrayWithContentsOfFile:path];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"phone_code = %@", @"String variable containing code"];
NSDictionary *countryDictionary = [array filteredArrayWithPredicate:predicate].firstObject;

如果您想使用此类结构创建字典：{"phone_code":"country_code"}：

NSMutableDictionary *phonesDict = [NSMutableDictionary new];
for (NSDictionary *dict in array) {
    NSString *phoneCode = dict[@"phone_code"];
    NSString *countryCode = dict[@"country_code"];
    phonesDict[countryCode] = phoneCode;
}

注意：您应该将此字典存储在某处以避免访问磁盘上的文件。

Answer 2

NSDictionary *dictRoot = [NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"]];

// Your dictionary contains an array of dictionary
// Now pull an Array out of it.
NSArray *arrayList = [NSArray arrayWithArray:[dictRoot objectForKey:@"catlist"]];

// Now a loop through Array to fetch single Item from catList which is Dictionary
[arrayList enumerateObjectsUsingBlock:^(id obj, NSUInteger index, BOOL *stop) {
// Fetch Single Item
// Here obj will return a dictionary
NSLog(@"Category name : %@",[obj valueForKey:@"category_name"]);
NSLog(@"Category id   : %@",[obj valueForKey:@"cid"]);
}];

在NSDictionary中从plist获取数据

2 个答案: