Question

我希望用户能够搜索莎士比亚独白的表格视图，找到他们最需要的那个。

例如，有一个名为Helena的角色，并且＃34;所有的结果都很好......＃34;但是还有另一个角色Helena in＆＃34; A Midsummer Night＆＃39 ; s Dream＆＃34;。我希望用户能够在同一个搜索栏中输入角色名称和游戏名称，以显示他们想要的结果

例如：搜索查询＆＃34; helena仲夏＆＃34;应该只出现海伦娜在“仲夏夜之梦”中所说的独白＃34;

目前，在搜索＆＃34; helena＆＃34;：结果显示来自两个人的独白......所有人的结局都很好＆＃34;和＃34;仲夏夜之梦＆＃34;。

但在搜索＆＃34; helena仲夏＆＃34;甚至只是＆＃34; helena＆＃34;：没有结果。

我如何允许filterContentForSearchText忽略所有空白区域，同时查看搜索查询的任何方面是否与独白的任何部分匹配，无论是作者姓名，文本，标题，字符等。？

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSArray* words = [searchText componentsSeparatedByCharactersInSet :[NSCharacterSet whitespaceCharacterSet]];
searchText = [words componentsJoinedByString:@""];

NSPredicate *p0 = [NSPredicate predicateWithFormat:@"title contains[cd] %@", searchText];
NSPredicate *p1 = [NSPredicate predicateWithFormat:@"authorFirst contains[cd] %@", searchText];
NSPredicate *p2 = [NSPredicate predicateWithFormat:@"authorLast contains[cd] %@", searchText];
NSPredicate *p3 = [NSPredicate predicateWithFormat:@"text contains[cd] %@", searchText];
NSPredicate *p4 = [NSPredicate predicateWithFormat:@"gender contains[cd] %@", searchText];
NSPredicate *p5 = [NSPredicate predicateWithFormat:@"tone contains[cd] %@", searchText];
NSPredicate *p6 = [NSPredicate predicateWithFormat:@"period contains[cd] %@", searchText];
NSPredicate *p7 = [NSPredicate predicateWithFormat:@"age contains[cd] %@", searchText];
NSPredicate *p8 = [NSPredicate predicateWithFormat:@"length contains[cd] %@", searchText];
NSPredicate *p9 = [NSPredicate predicateWithFormat:@"notes contains[cd] %@", searchText];
NSPredicate *p10 = [NSPredicate predicateWithFormat:@"tags contains[cd] %@", searchText];
NSPredicate *p11 = [NSPredicate predicateWithFormat:@"character contains[cd] %@", searchText];

NSPredicate *predicateAll = [NSCompoundPredicate orPredicateWithSubpredicates:@[p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11]];
searchResults = [monologuesArray filteredArrayUsingPredicate:predicateAll];
}

Answer 1

我能在这里找到解决方案。

Core Data Query Multiple Columns with Single Search String

我的新filterContentForSearchText如下所示：

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
NSString *sep = @", ";
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:sep];
searchText = [searchText stringByReplacingOccurrencesOfString:@", " withString:@" "];
NSMutableArray *array = [searchText componentsSeparatedByCharactersInSet:set];

// The array splits up searchText based on dividing characters.
// However, this split creates a new element immediately that just a "" string. This empties the search results.
// This if statement ignores empty elements in the array, only recognizing a new element when a non-space character is entered. It's great!
if ( [array.lastObject isEqualToString:@""] || [array.lastObject isEqualToString:@" "] ) {
    // This keeps array from destroying itself and crashing.
    if ( array.count > 1 ) {
        NSLog(@"last object was %@",array.lastObject);
        [array removeLastObject];
    }
}

NSMutableArray *subPredicates = [NSMutableArray array];
for (NSString *q in array) {
    [subPredicates addObject:
     [NSPredicate predicateWithFormat:@"title contains[cd] %@ OR character contains[cd] %@ OR authorFirst contains[cd] %@ OR authorLast contains[cd] %@ OR text contains[cd] %@ OR gender contains[cd] %@ OR tone contains[cd] %@ OR period contains[cd] %@ OR age contains[cd] %@ OR length contains[cd] %@ OR notes contains[cd] %@ OR tags contains[cd] %@", q, q, q, q, q, q, q, q, q, q, q, q]];
}

NSCompoundPredicate *predicate = [[NSCompoundPredicate alloc] initWithType:NSAndPredicateType
                                                              subpredicates:subPredicates];

searchResults = [monologuesArray filteredArrayUsingPredicate:predicate];
}

filterContentForSearchText同时用于对象的多个属性

1 个答案: