如何重新排列NSString字符？

Question

我有一个NSString，

11/17/2013 12:00:00 AM

我想让它像

17/11/2013 12:00:00 AM

我想按月刷卡，

我正试图由subString来做，但却无法确切地知道。

有一种方法可以转换为NSData并更改格式，但我更愿意通过NSString进行转换。

谢谢

Answer 1

你可以这样做：

NSMutableArray *array = [[yourString componentsSeparatedByString:@"/"] mutableCopy];
id temp = [array objectAtIndex:1];
[array replaceObjectAtIndex:1 withObject:[array objectAtIndex:0]];
[array replaceObjectAtIndex:0 withObject:temp];

NSString * finalString = [array componentsJoinedByString:@"/"];

Answer 2

试一试：

NSMutableArray *dateArray = [[@"11/17/2013 12:00:00 AM" componentsSeparatedByString:@"/"] mutableCopy];
[dateArray exchangeObjectAtIndex:1 withObjectAtIndex:0];
NSString *dateString = [dateArray componentsJoinedByString:@"/"];
NSLog(@"%@", dateString);

Answer 3

就像这样：

NSString *date = @"11/17/2013 12:00:00 AM";
NSString *m = [date substringWithRange:NSMakeRange(0, 2)];
NSString *d = [date substringWithRange:NSMakeRange(3, 2)];
NSString *result = [NSString stringWithFormat:@"%@/%@/2013 12:00:00 AM",d,m];

我还没试过