Question

当他们匹配一个或多个标准（kOption）时，我试图将对象返回到NSArray。如果我有kOption1或kOption2或kOption3等等，我出来的代码效果很好，但如果我有kOption1和KOption2，它将只返回第一个。

我刚刚开始编程，我试图找出如何获得这个，而不必编写大量的if / else嵌套条件。或者这是我必须去的方式？

谢谢。

if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption1]) {

    return [BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                             withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede != %d) AND (idTipoSede != %d)", kTipoSedePrivata, kTipoSedeDayOff]
                                                   sortKey:nil
                                             sortAscending:NO];


} if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption2]) {

    return [BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                             withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d)", kTipoSedeVenue, kTipoSedeArci, kTipoSedeSquat, kTipoSedeGalleria, kTipoSedeHouse, kTipoSedeFestival]
                                                   sortKey:nil
                                             sortAscending:NO];


} if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption3]) {

    return [BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                             withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d)", kTipoSedeVenue, kTipoSedeArci, kTipoSedeSquat, kTipoSedeGalleria, kTipoSedeHouse, kTipoSedePromoter]
                                                   sortKey:nil
                                             sortAscending:NO];
    } else {
       return [something else...];
}

Answer 1

使用NSMutableArray，因为您必须返回多个元素

NSMutableArray *arr = [@[] mutableCopy];

if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption1]) {

    [arr addObject:[BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                             withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede != %d) AND (idTipoSede != %d)", kTipoSedePrivata, kTipoSedeDayOff]
                                                   sortKey:nil
                                             sortAscending:NO]];


} 

if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption2]) {

         [arr addObject:[BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                                 withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d)", kTipoSedeVenue, kTipoSedeArci, kTipoSedeSquat, kTipoSedeGalleria, kTipoSedeHouse, kTipoSedeFestival]
                                                       sortKey:nil
                                                 sortAscending:NO]];


} 

if ([[NSUserDefaults standardUserDefaults] boolForKey:kOption3]) {

         [arr addObject: [BOTManagedObjectContext searchObjectsForEntity:@"Sede"
                                                 withPredicate:[NSPredicate predicateWithFormat:@"(idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d) OR (idTipoSede = %d)", kTipoSedeVenue, kTipoSedeArci, kTipoSedeSquat, kTipoSedeGalleria, kTipoSedeHouse, kTipoSedePromoter]
                                                       sortKey:nil
                                                 sortAscending:NO]];
 } 


 if(something else) {
                [arr addObject: [something else...]];
 }

  return arr;

并使用你得到的地方 arr [0]表示kOption1，arr [1]表示kOption2，arr [3]表示kOption3，依此类推，根据需要检查数组计数。

返回NSArray匹配交叉标准

1 个答案: