“{”标记之前的预期标识符

Question

我正在尝试编译以下代码，但是在指定的行上出现错误：

#pragma mark CLLocationManagerDelegate Methods 

//**error expected identifier before  "{"  token**
-(void)locationmanager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation  *)newLocation fromLocation:(CLLocation *) 
{

MKCoordinateSpan span; 
span.latitudeDelta = 0,2;
span.longitudeDelta = 0,2;

MKCoordinateRegion region; 
region.span = span;
region.center = newLocation.coordinate;

[viewController.mapview setRegion:region animated:YES];
viewController.mapview.showsUserLocation = YES;

viewController.latitude.text =[NSString stringWithFormat:@"Xf", newLocation.coordinate.latitude]
viewController.longitude.text =[NSString stringWithFormat:@"Xf", newLocation.coordinate.longitude]

}

@end

我该如何解决这个问题？

Answer 1

在第一行的尾随{之前需要一个参数名称，例如

... fromLocation:(CLLocation *)fromLocation { 

Answer 2

是的，正如它所说，你有

-(void)locationmanager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation  *)newLocation fromLocation:(CLLocation *) 
{

你错过了来自位置名称的论点，事情应该是

-(void)locationmanager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation  *)newLocation fromLocation:(CLLocation *)someName
{

Answer 3

你在最后两个赋值语句中缺少分号。

Answer 4

将0,2替换为0.2（带点），并在最后两次通话结束时添加;。