iOS for循环数组去重 | 数组升序降序排列

• 直接上代码

for循环数组去重

    NSArray * arr = @[@1,@2,@3,@4,@1,@3,@4,@0,@6,@1,@5];
    NSMutableArray *arrM = [NSMutableArray arrayWithArray:arr];
    for (int i = (int)arrM.count-1; i >= 0; i --) {
        id a = arrM[i];
        for (int j = (int)arrM.count-1; j >= 0; j --) {
            id b = arrM[j];
            if (a == b && i != j) {
                [arrM removeObjectAtIndex:i];
                break;
            }
        }
    }

• 打印结果

arr:(
    1,
    2,
    3,
    4,
    0,
    6,
    5
)

续 07-03

数组升序降序

    NSArray *arr = @[@1,@4,@7,@3,@9,@6];
    NSArray *resut = [arr sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        return  [obj1 compare:obj2];//升序，obj1和obj2调换顺序则为降序；
    }];
    DLog(@"resut:%@",resut);

• 打印结果

resut:(
    1,
    3,
    4,
    6,
    7,
    9
)