iOS：客观化MKCoordinateSpan以放入一个数组

Question

我试图找到一种直接的方法将MKCoordinateSpan放入一个数组而不将其分解为lat和long并将其存储在NSArray中。不确定是否有这样的方式。

Answer 1

MKCoordinateSpan span = MKCoordinateSpanMake(1.0, 1.0);
NSData *data = [NSData dataWithBytes:&span length:sizeof(span)];

MKCoordinateSpan back;
[data getBytes:&back length:sizeof(back)];

NSLog(@"%f",back.latitudeDelta);

Answer 2

试试这个：

MKCoordinateSpan currentSpan;
currentSpan = ...; // Set the span to somethinf
NSValue *spanVal = [NSValue valueWithBytes:&currentSpan objCType:@encode(MKCoordinateSpan)];
...
MKCoordinateSpan currentSpanBack;
[spanVal getValue:&currentSpanBack];