解析时无法识别的选择器 JSON

Question

下面的照片是我尝试从 URL 中读取的 JSON 脚本的屏幕截图。在下面的代码部分，我设法获取 'name' 属性并将其分配给 'name' NSString 对象，但是当我尝试对 'address' 执行相同操作时，我收到以下错误：

[__NSCFDictionary objectAtIndexedSubscript:]: unrecognized selector sent to instance 0x174260980
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndexedSubscript:]: unrecognized selector sent to instance 0x174260980'

我在 'venues' 中的做法与在 'location' 中的做法有何不同？我尝试了许多不同的方法来做到这一点，其中一些包括数组，但似乎没有任何效果。

NSURL *url = [NSURL URLWithString:urlString];

NSData *jsonData = [NSData dataWithContentsOfURL:url];
NSError *error = nil;
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

NSDictionary *responseDictionary = [dataDictionary objectForKey:@"response"];
NSDictionary *venueDictionary = [responseDictionary objectForKey:@"venues"];

for (NSDictionary *dict in venueDictionary) {
    NSLog(@"%@", dict);
    NSString *name = [dict objectForKey:@"name"];
    NSDictionary *locationDictionary = [dict objectForKey:@"location"];
    for (NSDictionary *locationDict in locationDictionary) {
        NSString *address = [locationDict objectForKey:@"address"];
        NSLog(@"%@", address);
    }
}

Answer 1

您希望 "location" 键指向一个数组，但事实并非如此。它指向一个对象，摆脱 for (NSDictionary *locationDict in locationDictionary) { 并只是从 locationDictionary 中拉出地址。

解析时无法识别的选择器 JSON

Unrecognized selector when parsing JSON

json

objective-c

ios

unrecognized-selector