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我为我的应用程序创建了一个加载图标。当应用程序加载地图并放置标记时，我在旋转的屏幕上显示了一个加载图标。使用我当前的代码，加载图标会显示，但仅当标记全部放在地图上并且所有内容都完成加载时才会旋转。我已经尝试了一切，有人可以帮忙吗？

我将在下面附上代码，我知道这不是最好的方法，一旦我发现我做错了什么让它在地图加载时旋转，我打算把它整理好。

谢谢。

- (void)viewDidLoad
{
    [super viewDidLoad];
    loading=@"0";

    rotateTimer = [NSTimer scheduledTimerWithTimeInterval:0.3
                                                   target:self
                                                 selector:@selector(rotateMove)
                                                 userInfo:nil
                                                  repeats:YES];
}

-(void)rotateMove
{
    if([loading  isEqual:@"1"])
    {
        [rotateTimer invalidate];
        rotateTimer = nil;
    }
    if([loading  isEqual:@"0"])
    {
        NSLog(@"move");
        [UIView animateWithDuration:1.0f delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
            [self.rotate setTransform:CGAffineTransformRotate(self.rotate.transform, M_PI_2)];
        } completion:^(BOOL finished){
            if (finished) {
            }
        }];
    }
}

已编辑：在下方添加了地图代码

-(void)mapload
{

 [self.mapView clear];


NSString *lat = [[NSString alloc] initWithFormat:@"%g", latitude];
NSString *lng = [[NSString alloc] initWithFormat:@"%g", longitude];
NSURL *blogURL = 
NSLog(@"URL = %@", blogURL);
NSData *jsonData = [NSData dataWithContentsOfURL:blogURL];
if(jsonData == nil)
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Connection Error" message:@"Please check your internet connection and try again." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    return;
}
else{



    NSError *error = nil;
    NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
    NSArray *test = [dataDictionary objectForKey:@"test"];

    self.bottombutton.hidden=FALSE;
    self.time.hidden=FALSE;
    self.mins.hidden=FALSE;
   self.rotate.hidden=TRUE;
    int tes = [[test[0] valueForKey:@"time"] intValue];


    }

    for (int i = 0; i < [test count]; i++)    {
        for(NSDictionary *coordinates in test){

            double la=[coordinates[@"lat"] doubleValue];
            double lo=[coordinates[@"long"] doubleValue];

            CLLocation * loca=[[CLLocation alloc]initWithLatitude:la longitude:lo];
            CLLocationCoordinate2D coordi=loca.coordinate;

            GMSMarker *marker= [[GMSMarker alloc] init];
            marker=[GMSMarker markerWithPosition:coordi];
            marker.snippet = coordinates[@"name"];
            marker.map = self.mapView;
            marker.appearAnimation = kGMSMarkerAnimationPop;

            UIImage * image = [UIImage imageNamed:@"mapiconlarge"];
            CGSize sacleSize = CGSizeMake(45, 45);
            UIGraphicsBeginImageContextWithOptions(sacleSize, NO, 0.0);
            [image drawInRect:CGRectMake(0, 0, sacleSize.width, sacleSize.height)];
            UIImage * resizedImage = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();

            NSLog(@"markeradded");
            marker.icon = resizedImage;
            NSLog(loading);


        }
      }


}



 }
4

1 回答 1

1

我们需要梳理一下应该在后台完成的代码部分——至少是网络请求——和必须在主节点上完成的代码——任何改变 UI 的代码......

// here, everything you do to prepare for the network request

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // make the network request
    NSData *jsonData = [NSData dataWithContentsOfURL:blogURL];
    dispatch_async(dispatch_get_main_queue(), ^{
        // here everything you do after with the json data result
    });
});

所以你不要用语法把自己逼疯，构建两个方法，第一个生成 blogURL 用于网络请求，第二个，获取 NSData 结果并执行其他所有操作。这样，只有一个单行方法调用嵌套在该内部调度中。

于 2015-12-29T01:59:34.830 回答