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n根据UUID、主要和次要提升异常预测筛选信标

clbeacon nscompoundpredicate ibeacon nspredicate

2

Simant · 技术社区 · 6 年前

我有一个信标数组有一个CLBeacon集合,我只想得到与NSPredicate中给定的uuid、major和minor匹配的信标。下面是对象C中的代码,该代码由于谓词中的UUID而生成异常。如果我从查询中删除uuidpreditate,代码就可以正常工作。

 - (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray<CLBeacon *> *)beacons inRegion:(CLBeaconRegion *)region{

        NSPredicate *uuidPredicate = [NSPredicate predicateWithFormat:@"uuid.UUIDString == [c] %@", @"03672ce6-9272-48ea-ba54-0bf679217980"];
       //NSPredicate *uuidPredicate = [NSPredicate predicateWithFormat:@"uuid == %@", @"03672ce6-9272-48ea-ba54-0bf679217980"];
        NSPredicate *majorPredicate = [NSPredicate predicateWithFormat:@"major = %ld", 1];
        NSPredicate *minorPredicate = [NSPredicate predicateWithFormat:@"minor = %ld", 3];

        NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates:@[uuidPredicate, majorPredicate, minorPredicate]];

        NSArray *pointABeacon = [beacons filteredArrayUsingPredicate:compoundPredicate];   

    }

信标阵列类似于

beacons (
    "CLBeacon (uuid:03672CE6-9272-48EA-BA54-0BF679217980, major:1, minor:1, proximity:1 +/- 0.07m, rssi:-61)",
    "CLBeacon (uuid:03672CE6-9272-48EA-BA54-0BF679217980, major:1, minor:2, proximity:1 +/- 0.07m, rssi:-62)",
    "CLBeacon (uuid:03672CE6-9272-48EA-BA54-0BF679217981, major:1, minor:3, proximity:2 +/- 1.64m, rssi:-53)"
)

例外是

***由于未捕获的异常“NSUnknownKeyException”而终止应用程序,原因:“[<CLBeacon 0x1c401c410>valueForUndefinedKey:]:此类是密钥uuid不符合密钥值编码

如何用uuid、major和minor三个参数过滤数组?

1 回复 | 直到 6 年前

1

Larme 6 年前

错误很明显: 一个 CLBeacon 对象没有名为 uuid .

当你打印一个 灯塔 对象,您可能会看到“uuid”,但这不是属性的真实名称,而是 proximityUUID

所以:

NSPredicate *uuidPredicate = [NSPredicate predicateWithFormat:@"uuid.UUIDString == [c] %@", @"03672ce6-9272-48ea-ba54-0bf679217980"];

应该是:

NSPredicate *uuidPredicate = [NSPredicate predicateWithFormat:@"proximityUUID.UUIDString == [c] %@", @"03672ce6-9272-48ea-ba54-0bf679217980"];