如何在升序中对对象的NSMutableArray进行排序，以及如何在iOS中更改DateFormat

Question

我是 iOS 的新手，我正在将我的应用与服务集成

并形成我正在获得的服务＆＃34;日期＆＃34;值和我将日期值存储在**NSMutableArray**中，那么我如何按升序排列我的数组列表请看下面

如何更改以下数组列表日期格式，如＆＃34; 2016年2月17日20:25＆＃34;请帮帮我一个

我的数组：

(
    "02/17/2016 1415",
    "02/13/2016 1415",
    "02/14/2016 1415",
    "02/18/2016 1534",
    "02/21/2016 1534",
    "02/22/2016 1534",
    "02/18/2016 1534",
    "02/20/2016 1534",
)

Answer 1

以递增顺序排序NsmutableArray的代码：

NSMutableArray *arr = @[@"02/17/2016",
                        @"02/13/2016",
                        @"02/14/2016",
                        @"02/18/2016",
                        @"02/21/2016",
                        @"02/22/2016",
                        @"02/18/2016",
                        @"02/20/2016"].mutableCopy;

NSSortDescriptor* sortOrder = [NSSortDescriptor sortDescriptorWithKey: @"self" ascending: YES];
NSArray *arr1 =  [arr sortedArrayUsingDescriptors: [NSArray arrayWithObject: sortOrder]];

和输出：

(
"02/13/2016",
"02/14/2016",
"02/17/2016",
"02/18/2016",
"02/18/2016",
"02/20/2016",
"02/21/2016",
"02/22/2016"
)

更改日期的代码Formate：

 NSString *dateString = @"11-13-2015";
 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 [dateFormatter setDateFormat:@"MM-dd-yyyy"];
 NSDate *date = [dateFormatter dateFromString:dateString];

 // Convert date object into desired format
 [dateFormatter setDateFormat:@"dd MMM yyyy"];
 NSString *newDateString = [dateFormatter stringFromDate:date];

Answer 2

<强>排序

 NSSortDescriptor* OrderBy = [NSSortDescriptor sortDescriptorWithKey: @"self" ascending: YES]; // for ascending use `YES`, for Descending USE `NO`
NSArray *finalArar =  [yourmutableArrayName sortedArrayUsingDescriptors: [NSArray arrayWithObject: OrderBy]];

更改dateFormat

    for (NSString *dte in finalArar)
    {
     NSDateFormatter *format = [[NSDateFormatter alloc] init];

     //your Date String is  02/17/2016
    [format setDateFormat:@"MM/dd/yyyy"];

    // for example like this 
    [format setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
   // or use this [format setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
    NSDate *parsed = [format dateFromString:dte];
     //final   String is     02 Feb 2016
     [format setDateFormat:@"dd MMM yyyy"];
       NSString *newDateString = [format stringFromDate:parsed];
       NSLog(@"final date==%@",newDateString)
      }