使用NSPredicate iOS在具有NSArray和NSString的NSArray中查找值

Question

僅使用NSArray我可以找到以下值：

NSArray *arr = [NSArray arrayWithObjects:@"299-1-1", @"299-2-1", @"299-3-1", @"399-1-1", @"399-2-1", @"399-3-1", @"499-1-1", @"499-2-1", @"499-3-1", nil];
NSString *search = @"299";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@",[NSString stringWithFormat:@"%@", search]];
NSArray *array = [arr filteredArrayUsingPredicate: predicate];
NSLog(@"result: %@", array);

Found Result符合預期：

 result: (
 "299-1-1",
 "299-2-1",
 "299-3-1"
 )

但對於NSArray具有NSArray與NSString

NSArray *arr = [NSArray arrayWithObjects:[NSArray arrayWithObjects:@"299-1-1", nil],[NSArray arrayWithObjects:@"399-1-1", nil],[NSArray arrayWithObjects:@"499-1-1", nil], nil];

這里的predicate syntax是什么？

Answer 1

要搜索嵌套數組，可以在謂詞中使用“ ANY”運算符：

NSArray *arr = [NSArray arrayWithObjects:[NSArray arrayWithObjects:@"299-1-1", nil],[NSArray arrayWithObjects:@"399-1-1", nil],[NSArray arrayWithObjects:@"499-1-1", nil], nil];
NSString *search = @"299";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY SELF CONTAINS %@", search];
NSArray *array = [arr filteredArrayUsingPredicate: predicate];
NSLog(@"result: %@", array);

輸出：

(
    (
        "299-1-1"
    )
)

Answer 2

如果要提供一組searchTerm，則需要更改謂詞。

這樣的事情會做到的

NSArray *arr         = @[ @"299-1-1", @"299-2-1", @"299-3-1", @"399-1-1", @"399-2-1", @"399-3-1", @"499-1-1", @"499-2-1", @"499-3-1" ];
NSArray *searchTerms = @[ @"299", @"399" ];

NSPredicate *predicate = [NSPredicate predicateWithBlock:^ (id evaluatedObject, NSDictionary *bindings) {   
  for (NSString *searchTerm in searchTerms) {
    if (NSNotFound != [evaluatedObject rangeOfString:searchTerm].location) {
      return YES;
    }   
  }
  return NO;
}];

NSArray *array = [arr filteredArrayUsingPredicate:predicate];
NSLog(@"result: %@", array);
//#=> result: (
  "299-1-1",
  "299-2-1",
  "299-3-1",
  "399-1-1",
  "399-2-1",
  "399-3-1"
)

Answer 3

NSArray *arr = [NSArray arrayWithObjects:[NSArray arrayWithObjects:@"299-1-1", nil],[NSArray arrayWithObjects:@"399-1-1", nil],[NSArray arrayWithObjects:@"499-1-1", nil], nil];
NSString *search = @"299";
NSMutableArray *filteredArray = [[NSMutableArray alloc] init];
for (NSArray *array in arr) {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self CONTAINS %@",search];
    if([array filteredArrayUsingPredicate:predicate].count)
    {
        [filteredArray addObject:[array filteredArrayUsingPredicate:predicate]];
    }
}
NSLog(@"%@", filteredArray);