objective-c - 扮演双重角色？

Question

我怎样才能把东西转或投到一个替身？CLLocationDegrees 真的是双精度，所以我如何将它转换为双精度，这样我的 if 总是返回双精度，我可以将 findAllLocalCountTotal 参数更改为双精度而不是 CLLocationDegrees？

if(self.lastKnownLocation == nil ){
    double lat = [CLController sharedInstance].latitude;
    double lng = [CLController sharedInstance].longitude;

}else{
    CLLocationDegrees lat = self.lastKnownLocation.coordinate.latitude;
    CLLocationDegrees lng = self.lastKnownLocation.coordinate.longitude;
}

NSNumber *tempInt = self.lastPostsGrabbedCounter;



//Make call to get data with lat lng
self.webServiceAllCount = [Post findAllLocalCountTotal:(CLLocationDegrees)lat withLong:(CLLocationDegrees)lng];

Answer 1

只需使用强制转换并将变量声明移出if- if&else分支是不同的范围并引入了它们自己的变量：

double lat, lng;
if(self.lastKnownLocation == nil)
{
   lat = [CLController sharedInstance].latitude;
   lng = [CLController sharedInstance].longitude;
}
else
{
   lat = (double)self.lastKnownLocation.coordinate.latitude;
   lng = (double)self.lastKnownLocation.coordinate.longitude;
}

Answer 2

这个话题能帮到你吗？配置度