iOS 正向地理编码块未执行

Question

为什么这段代码没有被执行？我从我的另一个项目中复制并粘贴了它，它运行得很好。我还在我的其他应用程序中尝试过使用我在此处插入的相同 addressString ，并且效果非常好。

    NSString *addressString = [NSString stringWithFormat:@"%@ and %@, %@, NY", street, rightBound, [boroughs objectForKey:borough]];
    NSLog(@"Address string: %@",addressString);

    [geocoder geocodeAddressString:addressString completionHandler:^(NSArray *placemarks, NSError *error)
    {
        NSLog(@"Placemark count:%d",[placemarks count]);

        for(CLPlacemark *placemark in placemarks)
        {
            NSLog(@"%@",placemark);
        }

        if(anError)
        {
            NSLog(@"Error: %@",[error description]);
        }
    }];

任何地标和错误消息都不会记录到控制台。

这是我的整个 AppDelegate.m：

@implementation AppDelegate

@synthesize window = _window;

- (void)dealloc
{
    [_window release];
    [super dealloc];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSError *error = nil;
    SBJsonParser *parser = [[SBJsonParser alloc] init];

    NSString *JSONString = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Streets" ofType:@"json"] encoding:NSUTF8StringEncoding error:&error];

    if(error)
    {
        NSLog(@"%@",[error description]);
        NSLog(@"Break");
    }

    NSDictionary *dict = [parser objectWithString:JSONString error:&error];
    if(error)
    {
        NSLog(@"%@",[error description]);
        NSLog(@"Break");
    }

    NSArray *addresses = [[dict objectForKey:@"results"] retain];

    NSDictionary *boroughs = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"Bronx",@"Brooklyn",@"New York", @"Queens",@"Staten Island",nil] forKeys:[NSArray arrayWithObjects:@"B",@"K",@"M",@"Q",@"S", nil]];

    int i = 1;
    for(NSDictionary *file in addresses)
    {
        NSString *borough = [file objectForKey:@"Borough"];
        NSString *ID = [file objectForKey:@"ID"];
        NSString *leftBound = [file objectForKey:@"LeftBound"];
        NSString *rightBound = [file objectForKey:@"RightBound"];
        NSString *sideOfStreet = [file objectForKey:@"SideOfStreet"];
        NSString *street = [file objectForKey:@"Street"];

        NSString *addressString = [NSString stringWithFormat:@"%@ and %@, %@, NY", street, rightBound, [boroughs objectForKey:borough]];
//        NSLog(@"Address string: %@",addressString);

        CLGeocoder *geocoder = [[CLGeocoder alloc] init];

        [geocoder geocodeAddressString:addressString completionHandler:^(NSArray *placemarks, NSError *anError)
        {
            NSLog(@"AAAAAAAAAAAAAAAAAAAAAAAA");
            NSLog(@"Placemark count:%d",[placemarks count]);

            for(CLPlacemark *placemark in placemarks)
            {
                NSLog(@"Placemark: %@",placemark);
            }

            if(anError)
            {
                NSLog(@"Error: %@",[error description]);
            }
        }];

        [geocoder release];
        NSLog(@"%d",i++);
    }
    [parser release];
    [addresses release];

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];

    return YES;
}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
        if([keyPath isEqualToString:@"geocoder"])
        {
            NSLog(@"AAAAAAA");
        }
}

@end

Answer 1

您确定您的“geocoder”实例不为零吗？
如果您向“nil”对象发送消息，什么都不会发生...:)

NSLog(@"%@",geocoder);

Answer 2

我还是不确定发生了什么事。我在模拟器上运行了以下代码（原始代码减去 JSON 操作），它运行得很好。也许您需要全新安装 Xcode & iOS 模拟器？

@implementation AppDelegate

@synthesize window = _window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSString *addressString = [NSString stringWithFormat:@"1 Infinite Loop, Cupertino, CA"];

    CLGeocoder *geocoder = [[CLGeocoder alloc] init];

    [geocoder geocodeAddressString:addressString completionHandler:^(NSArray *placemarks, NSError *anError)
     {
         NSLog(@"AAAAAAAAAAAAAAAAAAAAAAAA");
         NSLog(@"Placemark count:%d",[placemarks count]);

         for(CLPlacemark *placemark in placemarks)
         {
             NSLog(@"Placemark: %@",placemark);
         }

         if(anError)
         {
             NSLog(@"Error: %@",[anError description]);
         }
     }];

    [geocoder release];

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];

    return YES;
}

@end

输出是：

2011-12-21 18:56:30.311 Test[44445:f803] AAAAAAAAAAAAAAAAAAAAAAAA
2011-12-21 18:56:30.312 Test[44445:f803] Placemark count:1
2011-12-21 18:56:30.314 Test[44445:f803] Placemark: 1 Infinite Loop, Cupertino, CA  95014-2083, United States @ <+37.33168400,-122.03075800> +/- 100.00m, region (identifier <+37.33168400,-122.03075800> radius 71.01) <+37.33168400,-122.03075800> radius 71.01m

我唯一能想到的是你可能太早发布你的地理编码器了！也许尝试将版本移到块中？这样，您就会知道地理编码器仅在完成地理编码操作后才被释放一次。

另外，您在块内的错误处理中犯了一个错误。
它应该是 NSLog(@"Error: %@",[anError description]);
而不是 NSLog(@"Error: %@",[错误描述]);。

另外，请确保您没有使用 ARC...

Answer 3

我知道这是一个老问题，但它不起作用的原因是你不能同时发出多个转发请求。在发送另一个之前，您必须检查 isGeocoding 属性。