Swift 4 Codable-Bool或String值（swift rangeofstring）

25-03-19 9

在本文中，我们将为您详细介绍Swift4Codable-Bool或String值的相关知识，并且为您解答关于swiftrangeofstring的疑问，此外，我们还会提供一些关于com.faceboo

在本文中，我们将为您详细介绍Swift 4 Codable-Bool或String值的相关知识，并且为您解答关于swift rangeofstring的疑问，此外，我们还会提供一些关于com.facebook.swift.codec.ThriftConstructor的实例源码、iOS swift NSMutableData没有成员appendString、ios – Swift：Codable – 提取单个编码密钥、iOS – 如何在swift中使用`NSMutableString`的有用信息。

本文目录一览：

Swift 4 Codable-Bool或String值（swift rangeofstring）
com.facebook.swift.codec.ThriftConstructor的实例源码
iOS swift NSMutableData没有成员appendString
ios – Swift：Codable – 提取单个编码密钥
iOS – 如何在swift中使用`NSMutableString`

Swift 4 Codable-Bool或String值（swift rangeofstring）

寻找一些有关如何处理我最近遇到的情况的意见。

我一直在使用Swift 4s Codable取得成功，但今天发现了我没有想到的崩溃。我正在使用的API说，它boolean为key 返回a
manage_stock。

我的存根结构如下：

struct Product: Codable {    var manage_stock: Bool?}

效果很好，问题在于API 有时会 返回a string而不是a boolean。

因此，我的解码失败并显示：

Expected to decode Bool but found a string/data instead.

该字符串只能等于"parent"，我希望它等于false。

我也可以将结构更改为var manage_stock:String?是否可以简化从API导入JSON数据的过程。但是，当然，如果我更改了此设置，我的错误将变为：

Expected to decode String but found a number instead.

有没有一种简单的方法来处理这种突变，或者我需要失去所有Codable带来表的自动化并实现我自己的自动化init(decoder: Decoder)。

干杯

答案1

小编典典

由于您无法始终控制要使用的API，因此这是一种Codable通过重写直接解决此问题的简单方法init(from:)：

struct Product : Decodable {    // Properties in Swift are camelCased. You can provide the key separately from the property.    var manageStock: Bool?    private enum CodingKeys : String, CodingKey {        case manageStock = "manage_stock"    }    init(from decoder: Decoder) throws {        let container = try decoder.container(keyedBy: CodingKeys.self)        do {            self.manageStock = try container.decodeIfPresent(Bool.self, forKey: .manageStock)        } catch DecodingError.typeMismatch {            // There was something for the "manage_stock" key, but it wasn''t a boolean value. Try a string.            if let string = try container.decodeIfPresent(String.self, forKey: .manageStock) {                // Can check for "parent" specifically if you want.                self.manageStock = false            }        }    }}

有关更多信息，请参见编码和解码自定义类型。

com.facebook.swift.codec.ThriftConstructor的实例源码

项目：hadoop-EAR 文件：HdfsFileStatus.java

/**
 * Constructor
 * @param length the number of bytes the file has
 * @param isdir if the path is a directory
 * @param block_replication the replication factor
 * @param blocksize the block size
 * @param modification_time modification time
 * @param access_time access time
 * @param permission permission
 * @param owner the owner of the path
 * @param group the group of the path
 * @param path the local name in java UTF8 encoding the same as that in-memory
 */
@ThriftConstructor
public HdfsFileStatus(@ThriftField(1) long length,@ThriftField(2) boolean isdir,@ThriftField(3) int block_replication,@ThriftField(4) long blocksize,@ThriftField(5) long modification_time,@ThriftField(6) long access_time,@ThriftField(7) FsPermission permission,@ThriftField(8) String owner,@ThriftField(9) String group,@ThriftField(10) byte[] path) {
  this.length = length;
  this.isdir = isdir;
  this.block_replication = (short)block_replication;
  this.blocksize = blocksize;
  this.modification_time = modification_time;
  this.access_time = access_time;
  this.permission = (permission == null) ? 
                    FsPermission.getDefault() : permission;
  this.owner = (owner == null) ? "" : owner;
  this.group = (group == null) ? "" : group;
  this.path = path;
}

项目：hadoop-EAR 文件：DatanodeInfo.java

@ThriftConstructor
// Last ThriftField used in superclass: 4
public DatanodeInfo(@ThriftField(1) String name,@ThriftField(2) String storageID,@ThriftField(3) int infoPort,@ThriftField(4) int ipcPort,@ThriftField(6) long capacity,@ThriftField(7) long dfsUsed,@ThriftField(8) long remaining,@ThriftField(9) long namespaceUsed,@ThriftField(10) long lastUpdate,@ThriftField(11) int xceiverCount,@ThriftField(12) String networkLocation,@ThriftField(13) String hostName,@ThriftField(14) int adminStateOrdinal) {
  super(name,storageID,infoPort,ipcPort);
  this.capacity = capacity;
  this.dfsUsed = dfsUsed;
  this.remaining = remaining;
  this.namespaceUsed = namespaceUsed;
  this.lastUpdate = lastUpdate;
  this.xceiverCount = xceiverCount;
  this.location = networkLocation;
  this.hostName = hostName;
  setAdminState(AdminStates.values()[adminStateOrdinal]);
}

项目：swift-hive-metastore 文件：Index.java

@ThriftConstructor
public Index(
             @ThriftField(value = 1,name = "indexName") final String indexName,@ThriftField(value = 2,name = "indexHandlerClass") final String indexHandlerClass,@ThriftField(value = 3,name = "dbname") final String dbname,@ThriftField(value = 4,name = "origTableName") final String origTableName,@ThriftField(value = 5,name = "createTime") final int createTime,@ThriftField(value = 6,name = "lastAccesstime") final int lastAccesstime,@ThriftField(value = 7,name = "indexTableName") final String indexTableName,@ThriftField(value = 8,name = "sd") final StorageDescriptor sd,@ThriftField(value = 9,name = "parameters") final Map<String,String> parameters,@ThriftField(value = 10,name = "deferredRebuild") final boolean deferredRebuild)
{
    this.indexName = indexName;
    this.indexHandlerClass = indexHandlerClass;
    this.dbname = dbname;
    this.origTableName = origTableName;
    this.createTime = createTime;
    this.lastAccesstime = lastAccesstime;
    this.indexTableName = indexTableName;
    this.sd = sd;
    this.parameters = parameters;
    this.deferredRebuild = deferredRebuild;
}

项目：swift-hive-metastore 文件：Partition.java

@ThriftConstructor
public Partition(
                 @ThriftField(value = 1,name = "values") final List<String> values,name = "tableName") final String tableName,name = "privileges") final PrincipalPrivilegeSet privileges,name = "linkTarget") final PartitionIdentifier linkTarget,name = "linkPartitions") final List<PartitionIdentifier> linkPartitions)
{
    this.values = values;
    this.dbname = dbname;
    this.tableName = tableName;
    this.createTime = createTime;
    this.lastAccesstime = lastAccesstime;
    this.sd = sd;
    this.parameters = parameters;
    this.privileges = privileges;
    this.linkTarget = linkTarget;
    this.linkPartitions = linkPartitions;
}

项目：hadoop-EAR 文件：ContentSummary.java

/** Constructor */
@ThriftConstructor
public ContentSummary(
    @ThriftField(1) long length,@ThriftField(2) long fileCount,@ThriftField(3) long directoryCount,@ThriftField(4) long quota,@ThriftField(5) long spaceConsumed,@ThriftField(6) long spaceQuota) {
  this.length = length;
  this.fileCount = fileCount;
  this.directoryCount = directoryCount;
  this.quota = quota;
  this.spaceConsumed = spaceConsumed;
  this.spaceQuota = spaceQuota;
}

项目：hadoop-EAR 文件：DatanodeID.java

/**
 * Create DatanodeID
 * @param name (hostname:portNumber)
 * @param storageID data storage ID
 * @param infoPort info server port 
 * @param ipcPort ipc server port
 */
@ThriftConstructor
public DatanodeID(@ThriftField(1) String name,@ThriftField(4) int ipcPort) {
  this.name = name;
  this.storageID = storageID;
  this.infoPort = infoPort;
  this.ipcPort = ipcPort;
}

项目：hadoop-EAR 文件：VersionedLocatedBlock.java

@ThriftConstructor
public VersionedLocatedBlock(@ThriftField(1) Block block,@ThriftField(2) List<DatanodeInfo> datanodes,@ThriftField(3) long startOffset,@ThriftField(4) boolean corrupt,@ThriftField(5) int dataProtocolVersion) {
  super(block,datanodes,startOffset,corrupt);
  this.dataProtocolVersion = dataProtocolVersion;
}

项目：hadoop-EAR 文件：LocatedBlocks.java

@ThriftConstructor
public LocatedBlocks(@ThriftField(1) long fileLength,@ThriftField(2) List<LocatedBlock> locatedBlocks,@ThriftField(3) boolean isUnderConstuction) {
  this.fileLength = fileLength;
  blocks = locatedBlocks;
  underConstruction = isUnderConstuction;
}

项目：hadoop-EAR 文件：LocatedBlockWithMetaInfo.java

@ThriftConstructor
public LocatedBlockWithMetaInfo(@ThriftField(1) Block block,@ThriftField(5) int dataProtocolVersion,@ThriftField(6) int namespaceId,@ThriftField(7) int methodFingerPrint) {
  super(block,corrupt,dataProtocolVersion);
  this.namespaceid = namespaceId;
  this.methodFingerPrint = methodFingerPrint;
}

项目：hadoop-EAR 文件：LocatedBlockWithFileName.java

@ThriftConstructor
public LocatedBlockWithFileName(@ThriftField(1) Block block,@ThriftField(5) String fileName) {
  super(block,corrupt);
  this.fullPath = fileName;
}

项目：hadoop-EAR 文件：LocatedBlocksWithMetaInfo.java

@ThriftConstructor
public LocatedBlocksWithMetaInfo(@ThriftField(1) long fileLength,@ThriftField(3) boolean isUnderConstuction,@ThriftField(4) int dataProtocolVersion,@ThriftField(5) int namespaceId,@ThriftField(6) int methodFingerPrint) {
  super(fileLength,locatedBlocks,isUnderConstuction,dataProtocolVersion);
  this.namespaceid = namespaceId;
  this.methodFingerPrint = methodFingerPrint;
}

项目：hadoop-EAR 文件：LocatedBlockWithOldGS.java

@ThriftConstructor
public LocatedBlockWithOldGS(@ThriftField(1) Block block,@ThriftField(7) int methodFingerPrint,@ThriftField(8) long oldGenerationStamp) {
  super(block,dataProtocolVersion,namespaceId,methodFingerPrint);
  this.oldGenerationStamp = oldGenerationStamp;
}

项目：hadoop-EAR 文件：VersionedLocatedBlocks.java

@ThriftConstructor
public VersionedLocatedBlocks(@ThriftField(1) long fileLength,@ThriftField(4) int dataProtocolVersion) {
  super(fileLength,isUnderConstuction);
  this.dataProtocolVersion = dataProtocolVersion;
}