错误：从不兼容的类型“ id”分配给“ CLLocationCoordinate2D” [英] Error : Assigning to 'CLLocationCoordinate2D' from incompatible type 'id'

问题描述

Hai我正在尝试在mkmap中显示多个注释。在添加坐标时，它显示错误：从不兼容的类型 id分配给 CLLocationCoordinate2D。我知道这是一个简单的问题，但是我已经搜索了很多次并尝试了很多，但是没有用，我的代码是

Hai I am trying to display multiple annotations in mkmap. While am adding the coordinates it shows the error:"Assigning to 'CLLocationCoordinate2D' from incompatible type 'id'". I know this is a simple prob, but I have searched many times and tried a lot but none works, my code is,

for(int i=0 ; i<coordinates.count ; i++)
    {
     MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
     point.coordinate =[coordinates objectAtIndex:i]; //here it shows the error
     point.title = @"title";
     [self.mapView addAnnotation:point];
    }

请劝我解决此问题。谢谢...

kindly advice me to solve this prob. Thank you...

推荐答案

由于 CLLocationCoordinate2D 不是目标， C对象，但为 struct ，它不能直接存储在 NSArray 对象中，而必须包装在其中 NSValue 对象。

As CLLocationCoordinate2D is not an Objective-C object, but a struct, it cannot be directly stored in an NSArray object, but rather it must be wrapped within an NSValue object.

因此，从数组中读取坐标的代码可能是 ：

Therefore the code to read co-ordinates from the array is probably:

CLLocationCoordinate2D coords;
[[coordinates objectAtIndex:i] getValue:&coords];
point.coordinate = coords;

但是要确定，我需要查看数组的创建方式。

However to know for sure, I would need to see how the array was created.

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