从Swift 3迁移至Swift 5.1时遇报错：'MKCoordinateRegionMake'不可用

Hey there! I’ve faced this exact error when moving Swift 3 code up to Swift 5.1, so I totally get where you’re coming from.

The issue here is that MKCoordinateRegionMake is an Objective-C-style factory function, and starting from Swift 3, Apple shifted towards using native Swift initializers for MapKit types instead. This makes the code more consistent with Swift’s overall syntax.

替换方案 #

Instead of using the old C-style function, you’ll want to use the Swift initializer for MKCoordinateRegion directly:

原来的Swift 3代码：

let region = MKCoordinateRegionMake(centerCoordinate, span)

修改后的Swift 5.1代码：

let region = MKCoordinateRegion(center: centerCoordinate, span: span)

额外补充：处理基于距离的区域初始化 #

If you were using MKCoordinateRegionMakeWithDistance (another common Objective-C helper), that also has a Swift-native replacement:

旧代码：

let region = MKCoordinateRegionMakeWithDistance(centerCoordinate, latitudinalDistance, longitudinalDistance)

新代码：

let region = MKCoordinateRegion(center: centerCoordinate, latitudinalMeters: latitudinalDistance, longitudinalMeters: longitudinalDistance)

小提示 #

Xcode usually shows a quick fix suggestion when you hover over the deprecated function—just click the "Fix" button and it’ll auto-replace it with the correct Swift syntax. But if that doesn’t pop up for some reason, the manual replacement above works perfectly.

内容的提问来源于stack exchange，提问作者Omar Castaño