Question

我有一个NSString，其值为：

NSString *combined = "10014, 40.734, -74.0053";

我想打破这个字符串，其中有逗号分为三个NSStrings，它们调用bZip，bLat和bLon，以便值如下所示：

bZip = 10014 
bLat = 40.734 
bLon = -74.0053

然后我想使用bLat和bLon坐标来更新MapView上的中心位置。 MapView从JSON提要中提取数据并绘制出标记，但我需要将地图重新聚焦在bLat和bLon值中保存的坐标上。

我假设我需要在行之后进行此更改：

[self.mapView1 addAnnotations:newAnnotations];

有谁知道如何帮助我实现这一目标？谢谢大家！

NSData *data = [NSData dataWithContentsOfURL:url];

NSError *error;
NSArray *array = [NSJSONSerialization JSONObjectWithData:data
                                                 options:0
                                                   error:&error];

CLLocationCoordinate2D location;                        
NSMutableArray *newAnnotations = [NSMutableArray array]; 
MapViewAnnotation *newAnnotation;                        

for (NSDictionary *dictionary in array)
{   
    location.latitude = [dictionary[@"placeLatitude"] doubleValue];
    location.longitude = [dictionary[@"placeLongitude"] doubleValue];

    newAnnotation = [[MapViewAnnotation alloc] initWithTitle:dictionary[@"name"]
                                               andCoordinate:location];

    [newAnnotations addObject:newAnnotation];


}

[self.mapView1 addAnnotations:newAnnotations];

Answer 1

示例代码：

NSArray *stringArray = [combined componentsSeparatedByString: @","];

NSString *bZip = [stringArray objectAtIndex:0];
NSString *bLat = [stringArray objectAtIndex:1];
NSString *bLon = [stringArray objectAtIndex:2];

Answer 2

 NSString *combined = @"10014, 40.734, -74.0053";
 NSArray *array = [combined componentsSeparatedByString:@","];

Answer 3

尝试使用此

    NSString *combined = "10014, 40.734, -74.0053";
    NSArray *data = [combined componentsSeparatedByString:@", "];

NSLog(@"bZip = %@",[data objectAtIndex:0]);
NSLog(@"bLat = %@",[data objectAtIndex:1]);
NSLog(@"bLon = %@",[data objectAtIndex:2]);

将NSString分解为纬度和经度坐标并重新定位MapView

3 个答案: