p>

The error you're getting is actually:

使用不兼容类型CLLocationDistance（也称为'double'）初始化'CLLocationDistance *'（aka'double *'）

Initializing 'CLLocationDistance *' (aka 'double *') with an expression of incompatible type 'CLLocationDistance' (aka 'double')

它的意思是你正在初始化 itemDist CLLocationDistance （通知无星号）

What it's saying is you're initializing itemDist (which you've declared as a CLLocationDistance *) to something that is returning a CLLocationDistance (notice no asterisk).

CLLocationDistance 不是对象。

它只是一个原始类型（特别是 double - 请参阅核心位置数据类型参考）。

因此， code>作为指针添加到 CLLocationDistance ，只需将其声明为 CLLocationDistance （no asterisk）：

So instead of declaring itemDist as a pointer to a CLLocationDistance, just declare it as a CLLocationDistance (no asterisk):

CLLocationDistance itemDist = [itemLoc distanceFromLocation:current];

您还需要更新 NSLog 以期望 double 而不是对象，否则会在运行时崩溃：

You'll also need to update the NSLog to expect a double instead of an object otherwise it will crash at run-time:

NSLog(@"Distance: %f", itemDist);