结合多个NSArrays [英] Combining multiple NSArrays

问题描述

如何将多个NSArray组合成一个具有交替值的数组？例如。

How can I combine multiple NSArrays into one array with alternating values? For example.

数组一：橙色，苹果，梨

Array One: Orange, Apple, Pear

数组二：树，灌木，花

数组三：蓝色，绿色，黄色

Array Three: Blue, Green, Yellow

最终数组必须是：
Orange ，树，蓝色，苹果，灌木，绿色等

The final array would need to be: Orange, Tree, Blue, Apple, Shrub, Green, etc

推荐答案

假设数组的长度都相同：

Assuming the arrays are all of the same length:

NSUInteger numberOfArrays = 3;
NSUInteger arrayLength = [arrayOne length];
NSMutableArray *finalMutableArray = [NSMutableArray arrayWithCapacity:(arrayLength * numberOfArrays)];
for (NSUInteger index = 0; index < arrayLength; index++) {
    [finalMutableArray addObject:[arrayOne objectAtIndex:index]];
    [finalMutableArray addObject:[arrayTwo objectAtIndex:index]];
    [finalMutableArray addObject:[arrayThree objectAtIndex:index]];
}
NSArray *finalArray = [NSArray arrayWithArray:finalMutableArray];

您可能希望测试数组的长度是否相同。您不能将 nil 添加到 NSMutableArray 或 NSArray 。您可以添加 NSNull 占位符，但最好检查输入。

You will probably want to test that the arrays are of the same length. You cannot add nil to an NSMutableArray or NSArray. You can add an NSNull placeholder, but it's probably better to check your input.

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