Question

好的，我把问题分解成一个更容易理解的简单问题。所以下面的代码有一系列数字：1,0,1,0但是当我在它排序后将它打印出来时，它打印出来：0,0,0,0。我在这做错了什么？

 SortedDetailFields * sorty = [[SortedDetailFields alloc]init];

NSMutableArray * fieldArray = [[NSMutableArray alloc]init];

BOOL fieldone, fieldtwo,fieldthree,fieldfour;

NSSortDescriptor *fff = [NSSortDescriptor sortDescriptorWithKey:@"numbersToSort"
                                                                    ascending:NO];
fieldone = true;

fieldtwo = false;

fieldthree = true;

fieldfour = false;



if (fieldone) {
    sorty.numbersToSort = @"1";
    [fieldArray addObject:sorty];

}else{
    sorty.numbersToSort = @"0";
    [fieldArray addObject:sorty];
}

if (fieldtwo) {
   sorty.numbersToSort = @"1";
    [fieldArray addObject:sorty];
}else{
    sorty.numbersToSort = @"0";
    [fieldArray addObject:sorty];
}
if (fieldthree) {
    sorty.numbersToSort = @"1";
    [fieldArray addObject:sorty];
}else{
    sorty.numbersToSort = @"0";
    [fieldArray addObject:sorty];
}
if (fieldfour) {
    sorty.numbersToSort = @"1";
    [fieldArray addObject:sorty];
}else{
    sorty.numbersToSort = @"0";
    [fieldArray addObject:sorty];
}




NSLog(@"By numbers : %@",[fieldArray sortedArrayUsingDescriptors:@[fff]]);

for (SortedDetailFields * detain in fieldArray) {
    NSLog(@"Number %@",detain.numbersToSort);
}

所以我的问题是如何排序和打印对象，使它们匹配序列1,1,0,0？任何帮助是极大的赞赏。谢谢！

Answer 1

以@Naveen Prasad R的评论为基础：

最简单的解决方案是创建NSDictionaries，每次都是新的：

NSMutableArray* fieldArray = [NSMutableArray new];

[fieldArray addObject:@{@"field":@"fieldOne",@"value":"@(fieldone)}];
[fieldArray addObject:@{@"field":@"fieldTwo",@"value":"@(fieldtwo)}];
[fieldArray addObject:@{@"field":@"fieldThree",@"value":"@(fieldthree)}];
[fieldArray addObject:@{@"field":@"fieldFour",@"value":"@(fieldfour)}];

NSSortDescriptor *sorter = [NSSortDescriptor sortDescriptorWithKey:@"value"
                                                                    ascending:NO];

NSArray* sortedArray = [fieldArray sortedArrayUsingDescriptors:@[sorter]];
for (NSDictionary* dict in sortedArray) {
    NSLog(@"Number %@",dict[@"value"]);
}

这应该有效。另请确保如果您使用＆＃39; sortedArrayUsingDescriptors＆＃39;，您的原始数组将不会更改，但会返回已排序的版本！（在我的示例＆＃39; sortedArray＆＃39;）

而不是字符串＆＃39; fieldOne＆＃39;，＆＃39; fieldTwo＆＃39; ......你应该只使用你的真实物体！

NSortDescriptor打印出来并排序不正确

1 个答案: