Swift MagicalRecord saveWithBlock 语法

Question

在objC中saveWithBlock的方式是

[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {
        // This block runs in background thread
        } completion:^(BOOL success, NSError *error) {
        // This block runs in main thread
        }];

我这辈子都无法获得正确的 Swift block/closure 语法。不知道为什么这不适合我。有人可以帮忙制作上面的 swift 版本吗？

Answer 1

它应该看起来像这样：在我的脑海中...

MagicalRecord.saveWithBlock({ (localContext : NSManagedObjectContext!) in
        // This block runs in background thread
    }, completion: { (success : Bool, error : NSError!) in
       // This block runs in main thread
    })

Answer 2

对于 Swift 3.0 和 MagicalRecord 2.3.2

 MagicalRecord.saveWithBlock({
    (localContext: NSManagedObjectContext!) in
// Do your work to be saved here, against the `localContext` instance
// Everything you do in this block will occur on a background thread

}, completion: {
    (MRSaveCompletionHandler) in
    // This block runs in main thread
})

Answer 3

试试这个

  MagicalRecord.save({ (localContext:NSManagedObjectContext) in   
    }, completion:{  (success: Bool,error: NSError!) in

        } as? MRSaveCompletionHandler
    )

Answer 4

下面给出了 Swift4 语法，试试这个

MagicalRecord.save({ (localContext) in
    // This block runs in background thread
}) { (success, error) in
    // This block runs in main thread
}

希望对您有所帮助。