如何使用nsdictionary拆分字符串和交換值

Question

我是ios的新手，正嘗試做這樣的事情

self.dataArray = [dictionary valueForKey:@"LIST"];

{
  "List": [
    {
      "FULLNAME": "FirstName, LastName",
      "ID": "281"
    }
  ]
}

我想交換“ FULLNAME”中的值，也就是我希望它是姓氏，名字

我嘗試了各種方法，但是不起作用。 有人可以告訴我如何做到這一點嗎？

謝謝

Answer 1

假設您知道如何進行字典操作，這是交換字符串中元素的一種方法：

NSString* name = @"Firstname, Lastname";
// Remove the space after comma (not necessary if you know the name will always
// have a space after comma, then just split on ', '.
NSString* normalizedName = [name stringByReplacingOccurrencesOfString:@", " withString:@","];
// Split the string on ','.
NSArray* nameParts = [normalizedName componentsSeparatedByString:@","];
// Reverse the array
NSArray* reverseNameParts = [[nameParts reverseObjectEnumerator] allObjects];
// Join the array with ', '
NSString* revname = [reverseNameParts componentsJoinedByString:@", "];
NSLog(@"Reversed name parts: %@", revname);

Answer 2

我相信如果字典包含數組，應該是objectForKey而不是valueForKey。

self.dataArray = [dictionary objectForKey:@"LIST"];
    for(NSString *fullname in self.dataArray){
        if([fullname isEqualToString:@"FULLNAME"]){
            NSArray *name = [fullname componentsSeparatedByString:@","];
            NSMutableString* reverseName = [NSMutableString string];
            for (int i=[name count]-1; i>=0;i--){
                [reverseName appendFormat:@", ", [name objectAtIndex:i]];
                //reverse name should be what you are looking for..or something close
            }
        }
    }

希望這可以幫助