Swift等效客观代码

Question

我是xcode的新手。我想将下面的客观c代码转换为swift等价。

ActionStringCancelBlock cancel = ^(ActionSheetStringPicker *picker) {
    NSLog(@"Block Picker Canceled");
};

提前致谢。

Answer 1

这是快速的等价物：

let cancel: ActionStringCancelBlock = { (picker: ActionSheetStringPicker) in
    NSLog("Block Picker Canceled")
}

建议阅读：Closures

Answer 2

您可以这样做：

let cancel: ActionStringCancelBlock = { (picker: ActionSheetStringPicker!) in
    println("Block Picker Canceled")
    return
}

但你可能会逃避：

let cancel: ActionStringCancelBlock = {
    println("Block Picker Canceled")
}