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我无法理解,为什么在某些情况下我出现错误“扩展中的声明无法覆盖”,而在其他情况下则不是。奇怪的错误“扩展中的声明无法覆盖”
代码:
protocol ConstrTest {
var goodConstraints: [NSLayoutConstraint] {get}
var badConstraints: [NSLayoutConstraint?] {get}
}
extension UIViewController: ConstrTest
{
var goodConstraints: [NSLayoutConstraint] {
return []
}
var badConstraints: [NSLayoutConstraint?] {
return []
}
}
class TestViewController: UIViewController {
override var goodConstraints: [NSLayoutConstraint] {
return []
} //No errors and it works
override var badConstraints: [NSLayoutConstraint?] {
return []
} //Got error Declarations in extensions cannot override
}
为什么我可以在此改变一个数组,不能覆盖选配阵列?
可能是重复的https://stackoverflow.com/questions/34061246/override-function-error-in-swift – XmasRights