Question

我是swift的新手，将我的代码升级为swift 3。

Swift 2.3代码如下：

func sectionTite() {
        let keyArray:NSArray  = self.messageDictionary.allKeys
        let sortedArray = keyArray.sortedArrayUsingComparator { (dateString1: AnyObject, dateString2: AnyObject) -> NSComparisonResult in
            let d1:NSDate = NSDate.dateFromString(dateString1 as! String, fromFormat: NSDate.DateFormat.KYYYY_MM_DD)
            let d2: NSDate = NSDate.dateFromString(dateString2 as! String, fromFormat: NSDate.DateFormat.KYYYY_MM_DD)
            return (d1 ).compare(d2 )
        }
        self.sectionArray = sortedArray
    }

Swift 3.0

func sectionTite() {
        let keyArray:NSArray  = self.messageDictionary.allKeys as NSArray
        let sortedArray = keyArray.sortedArray (comparator: { (dateString1: AnyObject, dateString2: AnyObject) -> ComparisonResult in
            let d1:Date = Date.dateFromString(dateString1 as! NSString , fromFormat: Date.DateFormat.KYYYY_MM_DD as NSString)
            print(d1)
            let d2: Date = Date.dateFromString(dateString2 as! NSString, fromFormat: Date.DateFormat.KYYYY_MM_DD as NSString)
            return (d1 ).compare(d2 )
        } as! (Any, Any) -> ComparisonResult)
        self.sectionArray = sortedArray as NSArray
    }

上面的代码崩溃了状态EXC_breakpoint（code1，subcode ...），它没有说明崩溃的原因。 keyArray由一个日期项组成.Below代码创建问题。

let keyArray:NSArray  = self.messageDictionary.allKeys as NSArray

Answer 1

使用原生swift类型Array和Dictionary代替NSArray和NSDictionary。因此，请将sectionArray声明为[String]而不是NSArray

var sectionArray = [String]()

现在按照这种方式对字典键进行排序。

if let dic = self.messageDictionary as? [String:Any] {
    let keys = Array(dic.keys) as [String]
    let dateForamatter = DateFormatter()
    dateForamatter.dateFormat = Date.DateFormat.KYYYY_MM_DD //Set Your dateFormat
    self.sectionArray = keys.sorted(by: { (str1, str2) -> Bool in
        let date1 = dateForamatter.date(from: str1)! //I have force wrapped
        let date2 = dateForamatter.date(from: str2)!
        return date1 < date2
    })
}

Answer 2

 let keyArray:NSArray  = self.messageDictionary.allKeys as NSArray
        let dateForamatter = DateFormatter()
                    dateForamatter.dateFormat = Date.DateFormat.KYYYY_MM_DD //Set Your dateFormat
                    self.sectionArray = keyArray.sorted(by: { (str1, str2) -> Bool in
                        let date1 = dateForamatter.date(from: str1 as! String)! 
                        let date2 = dateForamatter.date(from: str2 as! String)!
                        return date1 < date2
                    }) as NSArray

        self.sectionArray = keyArray as NSArray
    }

Swift 3升级错误 - 执行错误代码

2 个答案: