iOS objective-c 执行选择器不执行该方法

Question

嘿，实际上我在 url 请求 block 中使用了 perform selector，一开始它工作正常，但现在它没有执行该功能

执行选择器函数是

       NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; // you need to convert to dictionary object
        NSLog(@"requestReply: %@", jsonDict);
        self.tmp=[jsonDict valueForKey:@"otp"] ;
        self.str=self.tmp;
        NSLog(@"tmp storage inside block:%@",self.tmp);
      //  [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateStatus) userInfo:nil repeats:YES];
        [self performSelector:@selector(updateStatus) withObject:self afterDelay:1.0];
    }] resume];
}

更新状态的方法是

-(void)updateStatus{
NSLog(@" storage:%@",self.str);
NSLog(@"tmp storage:%@",self.tmp);
[ self performSegueWithIdentifier:@"b1" sender:self];
}

因为它没有执行我无法执行 segue 并且应用程序停留在同一页面

Answer 1

很简单，在主线程中更新你的用户界面

  dispatch_async(dispatch_get_main_queue(), ^{
        [self performSelector:@selector(updateStatus) withObject:nil afterDelay:0.1];
         });

选项 2

或者创建简单的方法

       NSLog(@"tmp storage inside block:%@",self.tmp);
        [self updateStatus];

在主线程中调用方法

-(void)updateStatus{
NSLog(@" storage:%@",self.str);
NSLog(@"tmp storage:%@",self.tmp);
dispatch_async(dispatch_get_main_queue(), ^{
    [ self performSegueWithIdentifier:@"b1" sender:self];
});
}

更新代码

 NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
       // NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; // this is json string
        //   NSError *error;
        NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; // you need to convert to dictionary object
        NSLog(@"requestReply: %@", jsonDict);
        self.tmp=[jsonDict valueForKey:@"otp"] ;
        self.str=self.tmp;
        NSLog(@"tmp storage inside block:%@",self.tmp);
        dispatch_async(dispatch_get_main_queue(), ^{
            [self performSelector:@selector(updateStatus) withObject:nil afterDelay:0.1];
        });

    }] resume];

并将方法调用为

 -(void)updateStatus{
NSLog(@" storage:%@",self.str);
NSLog(@"tmp storage:%@",self.tmp);
[ self performSegueWithIdentifier:@"b1" sender:self];


}