Swift等價客觀代碼

Question

我是xcode的新手。我想將下面的目標C代碼轉換爲快速等效。

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

在此先感謝。

Answer 1

這是迅速相當於：

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

推薦閱讀：Closures

Answer 2

你可能只需要做到：

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

，但你可能會逃脫：

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