WatchKit的setBackground顏色碰撞

Question

進口UIKit的，並試圖切換周圍，其中以編程方式初始化按鈕的顏色後，我似乎無法找出爲什麼崩潰發生在類符合WKInterfaceController

import UIKit 
import WatchKit 

class InterfaceController: WKInterfaceController { 

    @IBOutlet fileprivate var myButton : WKInterfaceButton! 

    override func willActivate() { // About to be visible to user 
    super.willActivate() 

    self.myButton.setBackgroundColor(UIColor.red) // CRASH 
    } 
} 

Answer 1

原因在於未使用的斷點。

總之：

使用awake(withContext:)改變UI：

When creating an interface controller, WatchKit instantiates the class and calls its init() method followed shortly by its awake(withContext:) method. Use those methods to initialize variables, load data, and configure the items in your storyboard scene. If WatchKit passes a valid object to the awake(withContext:) method, use the information in that object to customize the initialization process.

不能使用willActivate()改變背景顏色等：

The willActivate() method lets you know when your interface is active. Use the willActivate() method to perform any last minute tasks, such as checking for updates to your content. (Do not use it for your primarily initialization.)

而且總是用weak網點：

@IBOutlet fileprivate weak var myButton : WKInterfaceButton! 

並檢查您的插座是否已連接。