使用非NS_ENUM目标-C枚举

Question

我正在使用wahoo健身API，它定义了以下目标-C enum：

typedef enum
{
    /** No active connection. */
    WF_SENSOR_CONNECTION_STATUS_IDLE,
    /** The connection is in process of being established. */
    WF_SENSOR_CONNECTION_STATUS_CONNECTING,
    /** The sensor connection is established and active. */
    WF_SENSOR_CONNECTION_STATUS_CONNECTED,
    /** The connection was interrupted (usually occurs when fisica is disconnected). */
    WF_SENSOR_CONNECTION_STATUS_INTERRUPTED,
    /** The connection is in process of being disconnected. */
    WF_SENSOR_CONNECTION_STATUS_DISCONNECTING,

} WFSensorConnectionStatus_t;

我想不出用什么方法在斯威夫特。我第一次试着对它做一个开关/箱子，但没有成功。我现在只想继续做下去，尝试以下几点：

var connState : WFSensorConnectionStatus_t = WF_SENSOR_CONNECTION_STATUS_IDLE
...
if( connState == WF_SENSOR_CONNECTION_STATUS_IDLE){

但它没有编译：

'WFSensorConnectionStatus_t' is not convertible to 'NSObject'

有什么解决办法吗？我阅读时使用的是WFSensorConnectionStatus_t.WF_SENSOR_CONNECTION_STATUS_IDLE或WF_SENSOR_CONNECTION_STATUS_IDLE.value，但它在xcode beta-4中不起作用。

Answer 1

使用.value获取基本整数的解决方法不再像您所说的那样，从Beta 4开始工作。

不幸的是，enum不能从Objective转移到Swift，它需要是一个NS_ENUM。

在一个项目中，我需要来自Objective框架的enum，并在Swift中使用它，我的设置与您相同。

我所做的解决办法是创建一个包含NS_ENUM的Objective类别，并在那里将值从框架enum传递到我自己的NS_ENUM。

导入桥接标题中的类别，您应该能够像通常那样使用enum。

就像这样：

typedef NS_ENUM(NSUInteger, ConnectionStatus) {
    ConnectionStatusIdle
}

- (ConnectionStatus)connectionStatus {
    if [self getConnectionStatus] == WF_SENSOR_CONNECTION_STATUS_IDLE {
        return ConnectionStatusIdle
    }
}

那么您应该能够像这样使用它：

switch myObject.connectionStatus() {
    case .Idle:
        // do something
        break
}

Answer 2

以下是最终的完整解决方案：

WFSensorConnection+SensorConnectionEnumCategory.h

#import <Foundation/Foundation.h>

#import <WFConnector/WFConnector.h>

@interface WFSensorConnection (SensorConnectionEnumCategory)

typedef NS_ENUM(NSUInteger, ConnectionStatus) {
    ConnectionStatusIdle,
    ConnectionStatusConnecting,
    ConnectionStatusConnected,
    ConnectionStatusInterrupted,
    ConnectionStatusDisconnecting
};

- (ConnectionStatus) swift_connectionStatus;

@end

WFSensorConnection+SensorConnectionEnumCategory.m

#import "WFSensorConnection+SensorConnectionEnumCategory.h"

@implementation WFSensorConnection (SensorConnectionEnumCategory)

- (ConnectionStatus) swift_connectionStatus{
    if ( [self connectionStatus] == WF_SENSOR_CONNECTION_STATUS_IDLE ){
        return ConnectionStatusIdle;
    } else if ( [self connectionStatus] == WF_SENSOR_CONNECTION_STATUS_CONNECTING ){
        return ConnectionStatusConnecting;
    } else if ( [self connectionStatus] == WF_SENSOR_CONNECTION_STATUS_CONNECTED ){
        return ConnectionStatusConnected;
    } else if ( [self connectionStatus] == WF_SENSOR_CONNECTION_STATUS_DISCONNECTING ){
        return ConnectionStatusDisconnecting;
    } else if ( [self connectionStatus] == WF_SENSOR_CONNECTION_STATUS_INTERRUPTED ){
        return ConnectionStatusInterrupted;
    }
    return 0;
}

@end

Bridging-Header.h

#import "WFSensorConnection+SensorConnectionEnumCategory.h"

用法：

var sensorConnection: WFSensorConnection?
var connState : ConnectionStatus = ConnectionStatus.Idle
connState = sensorConnection!.swift_connectionStatus()
switch connState {
    case ConnectionStatus.Idle:
...
}

Answer 3

C风格枚举在像UInt32这样的Swift中导入。所以你可以做这样的事情：

let state = unsafeBitCast(WF_SENSOR_CONNECTION_STATUS_IDLE, UInt32.self)
if state == unsafeBitCast(WF_SENSOR_CONNECTION_STATUS_IDLE, UInt32.self) {
    //do something
}

Upd:在SWIFT2.1 (Xcode 7.1 beta 2)中，所有C风格枚举都符合Equatable，您现在可以这样使用它：

let state = WF_SENSOR_CONNECTION_STATUS_IDLE
if state == WF_SENSOR_CONNECTION_STATUS_IDLE {
    //do something
}

利润:)