替换字符串列表中的字符

Question

我已按照属性time排序了我的list对象，它是String而不是date。在排序前

样本输出：

07:05:10 AM 
07:05:01 AM 
07:04:49 AM 
07:04:44 AM 
06:53:58 AM 
06:53:47 AM 
01:03:21 AM 
12:03:21 AM 

和调用instrudtion后：

self.myList = self.myList.sorted { $0.mytime < $1.mytime } 

会是这样的：

01:03:21 AM 
06:53:47 AM 
06:53:58 AM 
07:04:44 AM 
07:04:49 AM 
07:05:01 AM 
07:05:10 AM 
12:03:21 AM 

我能代替12:03:21 AM到00:03:21 AM只有当它是AM和12在开始？

还是有不同的方式来做到这一点？

在此先感谢！

Answer 1

我想这就是你要找的。总是用这种方式比较日期！

override func viewDidLoad() { 
    super.viewDidLoad() 
    var arrayOfDates = ["07:05:10 AM", 
         "07:05:01 AM", 
         "07:04:49 AM", 
         "07:04:44 AM", 
         "06:53:58 AM", 
         "06:53:47 AM", 
         "01:03:21 AM", 
         "12:03:21 AM"] 

    // This will throw an error if any of your dates are 
    // misformatted, so handle that appropriately.     
    arrayOfDates.sort() { $0.toDate()!.compare($1.toDate()!) == ComparisonResult.orderedDescending } 
    print("Descending: \(arrayOfDates)") 

    arrayOfDates.sort() { $0.toDate()!.compare($1.toDate()!) == ComparisonResult.orderedAscending } 
    print("Ascending: \(arrayOfDates)") 
} 

extension String { 
    func toDate() -> Date? { 
    let formatter = DateFormatter() 
    formatter.dateFormat = "hh:mm:ss a" 
    if let date = formatter.date(from: self) { 
     return date 
    } else { 
     return nil 
    } 
} 

//If you need a string version of the date you can use this as well 
extension Date { 
    func toString() -> String { 
     let formatter = DateFormatter() 
     formatter.dateFormat = "hh:mm:ss a" 
     return formatter.string(from: self) 
    } 
}