Question

我一直试图使用swift在Xcode中的firebase引用中获取最后的值，然后将这10个值分配给10个不同的UIButton标题。我尝试了很多东西，但大部分时间都没有发生任何事情，或者我遇到了崩溃。我已经尝试过断点，但因为代码太小而且没有运行时错误或警告，它更多地与我如何做（概念）有关。任何建议都会很棒，我希望这可以帮助他们在早期iOS和firebase时代的未来观点。非常感谢你的时间和错误！

以下是我在视频加载时触发崩溃的最新代码：

// import UIKit (already imported the module)

// UIButtons deck1 - deck10 are defined

// firebase reference refName is created

        override func viewDidLoad() {

            super.viewDidLoad()

            var titleArray = [String]()

            var buttonArray : [UIButton:String] = [ // creating a dictionary to make a link from UIButtons to a String that will contain their title

                deck1 : "",
                deck2 : "",
                deck3 : "",
                deck4 : "",
                deck5 : "",
                deck6 : "",
                deck7 : "",
                deck8 : "",
                deck9 : "",
                deck10 : ""

            ]

            refName.queryLimitedToLast(10).observeEventType(.Value, withBlock: { snapshot in // getting last

                for child in snapshot.children { // getting the last ten values

                    let title = child.value as String // assigning each value to a variable

                    titleArray.append(title) // adding each variable to an array of values as strings

                }

                buttonArray[self.deck1] = titleArray[0] // assigning each value that is a string in the array 'titleArray' to a UIButton key
                buttonArray[self.deck2] = titleArray[1]
                buttonArray[self.deck3] = titleArray[2]
                buttonArray[self.deck4] = titleArray[3]
                buttonArray[self.deck5] = titleArray[4]
                buttonArray[self.deck6] = titleArray[5] 
                buttonArray[self.deck7] = titleArray[6] 
                buttonArray[self.deck8] = titleArray[7] 
                buttonArray[self.deck9] = titleArray[8] 
                buttonArray[self.deck10] = titleArray[9]

                self.deck1.setTitle(buttonArray[self.deck1], forState: UIControlState.Normal)
                self.deck2.setTitle(buttonArray[self.deck2], forState: UIControlState.Normal)
                self.deck3.setTitle(buttonArray[self.deck3], forState: UIControlState.Normal)
                self.deck4.setTitle(buttonArray[self.deck4], forState: UIControlState.Normal)
                self.deck5.setTitle(buttonArray[self.deck5], forState: UIControlState.Normal)
                self.deck6.setTitle(buttonArray[self.deck6], forState: UIControlState.Normal)
                self.deck7.setTitle(buttonArray[self.deck7], forState: UIControlState.Normal)
                self.deck8.setTitle(buttonArray[self.deck8], forState: UIControlState.Normal)
                self.deck9.setTitle(buttonArray[self.deck9], forState: UIControlState.Normal)
                self.deck10.setTitle(buttonArray[self.deck10], forState: UIControlState.Normal)

            })

        }

Answer 1

假设已经将deck1-deck10定义为出口，请尝试

    deck1.titleLabel!.text = titleArray[0]
    deck2.titleLabel!.text = titleArray[1]
    ....

所以，

    // import UIKit (already imported the module)

    // UIButtons deck1 - deck10 are defined

    // firebase reference refName is created

    override func viewDidLoad() {

        super.viewDidLoad()

        var titleArray = [String]()

        refName.queryLimitedToLast(10).observeEventType(.Value, withBlock: { snapshot in // getting last

            for child in snapshot.children { // getting the last ten values

                let title = child.value as String // assigning each value to a variable

                titleArray.append(title) // adding each variable to an array of values as strings

            }

        }
    }

override func viewDidAppear(animated: Bool) {

            deck1.titleLabel!.text = titleArray[0] // assigning each value that is a string in the array 'titleArray' to a UIButton key
            deck2.titleLabel!.text = titleArray[1]
            deck3.titleLabel!.text = titleArray[2]
            deck4.titleLabel!.text = titleArray[3]
            deck5.titleLabel!.text = titleArray[4]
            deck6.titleLabel!.text = titleArray[5]
            deck7.titleLabel!.text = titleArray[6]
            deck8.titleLabel!.text = titleArray[7]
            deck9.titleLabel!.text = titleArray[8]
            deck10.titleLabel!.text = titleArray[9]
    }

也许可以使用一些循环

获取最后十个firebase值并将它们分配给十个UIButton的标题

1 个答案: