我有一个名为messageDict的属性,有时它会因为该应用程序崩溃而获得nil值.有人可以建议我如何妥善处理它.
var messageDict : [String : NSArray]?
if let messageDict = messageDict {
let messageArray = messageDict[outBoxId]! as! [MCOIMAPMessage] // crash indicates here
}
如果数据可用,我将存储在数据下面.有时它会是零
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