学习AFnetworking时遇到数据的获取问题：
在GET函数体内能成功获取到正确数据，而函数外为null，我想应该是异步问题，那么，如何在函数（block）外面获取到正确的数据呢？
http://localhost/json/1.json 的内容如下：
{
"tempMinC": "11",
"tempMinF": "51",
"weatherCode": "113",
"winddirection": "WNW"
}
代码为：
#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);
}
执行结果为：
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);的地方获取到正确的数据呢？
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