如何将 NSMutableArray 数组分成两个单独的数组或 objective C、iOS 中的两个可变数组

Question

我有一个包含 4 个的 nsmutable 数组 objects.no 我想根据条件将该对象分成两个数组（或两个可变数组）。

for  (NSDictionary *final in SectorsArray)
{
    FinalFlightData *ffd = [FinalFlightData new];
    ffd.flightnumber = [final objectForKey:@"FLI_NUM"];
    ffd.airlineCode = [final objectForKey:@"ARL_COD"];

    ffd.departureAirport = [final objectForKey:@"DepartureAirport"];
    ffd.departureDay = [final objectForKey:@"DepartureDay"];
    ffd.departureDate = [final objectForKey:@"DepartureDate"];
    ffd.departureTime = [final objectForKey:@"DepartureTime"];

    ffd.arrivalAirport = [final objectForKey:@"ArrivalAirport"];
    ffd.arrivalDay = [final objectForKey:@"ArrivalDay"];
    ffd.arrivalDate = [final objectForKey:@"ArrivalDate"];
    ffd.arrivalTime = [final objectForKey:@"ArrivalTime"];




    [testingArray addObject:ffd];
}

所以这个测试 nsmutable 数组有四个 objects.now 我想要这样。

OutboundArray = [NSMutableArray array];
InboundArray = [NSMutableArray array];
NSString *myString;

if([myString isEqualtoString:@"false"])
{
  //in here I want to put first two objects of testingArray into OutboundArray and last two objects of testingArray into InboundArray

}

else if([myString isEqualtoString:@"true"])
{
  //in here I want to put first three objects of testingArray into OutboundArray and last object of testingArray into InboundArray
}
else
{
  //in here I want to put first  object of testingArray into OutboundArray and last three objects of testingArray into InboundArray
}

我怎么办this.hope你的help.thanx

Answer 1

这是一个简单的方法。您可以根据需要进行概括。

NSArray *a = @[ @1, @2, @3, @4 ];

NSMutableArray *a1 = [NSMutableArray array];
NSMutableArray *a2 = [NSMutableArray array];

int limit = YES ? 3 : 1;

[a  enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    if (idx < limit) {
        [a1 addObject:obj];
    } else {
        [a2 addObject:obj];
    }
}];

这是第二种方法，它避免了显式循环。这个需要真正的拆分，而第一个很容易修改以允许数组之间的任意路由。

NSArray *a = @[ @1, @2, @3, @4 ];

NSMutableArray *a1 = [NSMutableArray array];
NSMutableArray *a2 = [NSMutableArray array];

int limit = YES ? 3 : 1;

NSRange a1range = NSMakeRange(0, limit);
NSRange a2range = NSMakeRange(limit, a.count - limit);

a1 = [[a subarrayWithRange:a1range] mutableCopy];
a2 = [[a subarrayWithRange:a2range] mutableCopy];

Answer 2

您可以仅从 testingArray 添加对象到 OutboundArray 或 InboundArray，即对于第一个条件，只需将索引 0 和 1 用于前两个对象的 OutboundArray，将索引 2 和 3 用于 InboundArray.Just，相应地在其他条件下使用相同的对象。 @Note 在从索引中获取之前首先检查 testingArray 中的对象，否则它将 crash.Always 以小写开头的变量名:)

if(firstCondition)
{
  [OutboundArray addObject:[testingArray objectAtIndex:0]];
  [OutboundArray addObject:[testingArray objectAtIndex:1]];
  [InboundArray addObject:[testingArray objectAtIndex:2]];
  [InboundArray addObject:[testingArray objectAtIndex:3]];

}

Answer 3

使用此代码：

if (testingArray.count >= 3)
{
    if([myString isEqualToString:@"false"])
    {
        //in here I want to put first two objects of testingArray into OutboundArray and last two objects of testingArray into InboundArray

        [OutboundArray addObjectsFromArray:[testingArray subarrayWithRange:NSMakeRange(0, 2)]];
        [InboundArray addObjectsFromArray:[testingArray subarrayWithRange:NSMakeRange(testingArray.count - 2, 2)]];

    }
    else if([myString isEqualToString:@"true"])
    {
        //in here I want to put first three objects of testingArray into OutboundArray and last object of testingArray into InboundArray

        [OutboundArray addObjectsFromArray:[testingArray subarrayWithRange:NSMakeRange(0, 3)]];
        [InboundArray addObject:testingArray.lastObject];

    }
    else
    {
        //in here I want to put first  object of testingArray into OutboundArray and last three objects of testingArray into InboundArray

        [OutboundArray addObject:testingArray.firstObject];
        [InboundArray addObjectsFromArray:[testingArray subarrayWithRange:NSMakeRange(testingArray.count - 3, 3)]];
    }
}
else if (testingArray.count == 2)
{
    [OutboundArray addObject:testingArray.firstObject];
    [InboundArray addObject:testingArray.lastObject];

}

如何将 NSMutableArray 数组分成两个单独的数组或 objective C、iOS 中的两个可变数组

how to divide NSMutableArray array into two seperate arrays or two mutable arrays in objective C, iOS

objective-c

nsmutablearray

nsarray

ios