将对象数组分为4组-iOS [英] split array of objects into groups of 4 - ios

问题描述

如何将对象数组拆分为对象数组?

How do you split an array of objects into an array of array of objects?

说我想分成4组，该怎么做?

say I want to split into groups of 4, how do I do that?

[a，b，c，d，e，f，g，h] =>[a，b] [c，d] [e，f] [g，h]

[a,b,c,d,e,f,g,h] => [a,b] [c,d] [e,f] [g,h]

或者如果我指定要分成3组，那么结果应该是[a，b，c]，[d，e，f]，[g，h]

or maybe if I specify that I want to split into groups of 3, then the result should be [a,b,c], [d,e,f], [g,h]

如果h不存在，它也应该工作.

it should also work if h doesn't exist.

推荐答案

尝试以下逻辑.....

Try this logic.....

NSArray *arr = [[NSArray alloc]initWithObjects:@"One",@"Two",@"Three",@"Four",@"Five",@"Six",@"Seven",nil];
NSMutableArray *arrNew = [[NSMutableArray alloc]init];
int numberofSubArrs = 3; // change this to check the logic
for (int i=0; i<numberofSubArrs; i++) {
    NSMutableArray *arrrr = [[NSMutableArray alloc]init];
    [arrNew addObject:arrrr];
}
int m = 0;
for (int k=0; k<[arr count]; k++) {
    [[arrNew objectAtIndex:m]addObject:[arr objectAtIndex:k]];
    m++;
    if (m == numberofSubArrs) {
        m=0;
    }
}
int g=0;
int p=0;
while(p<[arr count]) {
    for (int z=0; z<[[arrNew objectAtIndex:g] count]; z++) {
        [[arrNew objectAtIndex:g] replaceObjectAtIndex:z withObject:[arr objectAtIndex:p++]];
    }
    g++;
}
NSLog(@"Required Array is:%@",[arrNew description]);

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