在Swift 2.0中，do {} catch不会处理从这里抛出的错误 [英] Errors thrown from here are not handled for do { } catch in Swift 2.0

问题描述

在我更新swift 2.0之后，我遇到了一个错误，就像下面的图片那样{try} catch。

After i update swift 2.0 i got an error with do { try } catch like an image below.

我该如何解决这个问题？
谢谢！

How can i fix this? Thanks!

推荐答案

错误告诉您封闭式捕获并非详尽无遗。这是因为自动生成的 catch 块只捕获 NSError 对象，编译器无法分辨是否有些其他 ErrorType 将被抛出。

The error is telling you that the enclosing catch is not exhaustive. This is because the auto-generated catch block is only catching NSError objects, and the compiler can't tell whether some other ErrorType will be thrown.

如果你确定不会抛出其他错误，你可以添加另一个default catch block：

If you're sure no other errors will be thrown, you can add another default catch block:

do {
    objects = try managedObjectContext?.executeFetchRequest(request)
} catch let error1 as NSError {
    error = error1
    objects = nil
} catch {
    // Catch any other errors 
}

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