ios afnetworking-IOS中如何獲取AFNetworking中GET或POST的數據

IOS中如何獲取AFNetworking中GET或POST的數據

學習AFnetworking時遇到數據的獲取問題：
在GET函數體內能成功獲取到正確數據，而函數外為null，我想應該是異步問題，那麼，如何在函數（block）外面獲取到正確的數據呢？

http://localhost/json/1.json 的內容如下：

 { 
"tempMinC": "11",
"tempMinF": "51",
 "weatherCode": "113",
"winddirection": "WNW"
}

代碼為：

#import "AFHTTPRequestOperationManager.h"

 @interface ViewController ()
{
    __block NSString *winddirection;
}
@end

@implementation ViewController

- (void)viewDidLoad
{
   [super viewDidLoad];
   NSString *url = @"http://localhost/json/1.json";

   AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
   [manager GET:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
   winddirection = [(NSDictionary *)responseObject objectForKey:@"winddirection"];
   NSLog(@"winddirection is %@",winddirection);
   } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
   NSLog(@"Error...%@",error);
  }];
   NSLog(@"out of winddirection is %@",winddirection);
}

執行結果為：

2016-02-02 22:03:39.292 1[1042:60b] out of winddirection is (null)
2016-02-02 22:03:39.419 1[1042:60b] winddirection is WNW

如何在NSLog(@"out of winddirection is %@",winddirection);的地方獲取到正確的數據呢？

最佳回答：

根據你描述的貌似行不通，畢竟你是異步獲取數據，獲取完之後，不走你那個NSLog(@"out of winddirection is %@",winddirection);，你可以在block中獲取到數據之後進行調用外部方法（在外部方法裡面實現NSLog(@"out of winddirection is %@",winddirection);），進行賦值或者刷新UI。