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March 15, 2020 09:13
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A little type-safe CKRecord extension to prevent typo.
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| extension CKRecord { | |
| subscript<T: RawRepresentable>(key: T) -> CKRecordValueProtocol? where T.RawValue == CKRecord.FieldKey { | |
| get { | |
| return self[key.rawValue] | |
| } | |
| set { | |
| self[key.rawValue] = newValue | |
| } | |
| } | |
| } |
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| enum Key: CKRecord.FieldKey { | |
| case aaa | |
| case bbb | |
| } | |
| func usage() { | |
| let record = CKRecord(recordType: "Test") | |
| record[Key.aaa] = true | |
| let value = record[Key.aaa] | |
| // type of `value` is `CKRecordValueProtocol?` | |
| print(value) | |
| // Optional(1) | |
| } |
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Similar to CKRecord's default subscript access, getting a value requires a typecast.