# AsReaderNFCDevice

## `sharedInstance`

Creates and initializes an `AsReaderNFCDevice` object (Singleton pattern).

```objectivec
+ (instancetype)sharedInstance;
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `instancetype`
  - An `AsReaderNFCDevice` object
```

---

## `sendData`

Sends data.

```objectivec
- (BOOL)sendData:(NSData *)sendData;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `sendData`
  - NSData
  - Data to send
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `startScan`

Starts the AsReader NFC scan.  
After executing this method, the result is called back via [`receivedScanData`](../common/common/8_AsReaderDeviceProtocol.md#receivedscandata).

```objectivec
- (BOOL)startScan;
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `stopScan`

Stops scanning NFC tags on the AsReader device.

```objectivec
- (BOOL)stopScan;
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `readMultiBlockWithBlockIndex:count:`

Reads multiple consecutive blocks of data on the IC tag memory with the specified UID.  
**After executing this method, the result is called back via [`nfcReadMultiBlockReceived`](./6_AsReaderNFCProtocol.md#nfcreadmultiblockreceived).**

```objectivec
- (BOOL)readMultiBlockWithBlockIndex:(int)index count:(int)count;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `index`
  - int
  - Starting block number (0–255)
* - `count`
  - int
  - Number of blocks to read (0–255)
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `writeSingleBlockWithBlockIndex:writeData:uid:`

Writes data to a specified block in the IC tag memory with the specified UID.  
**After executing this method, the result is called back via [`nfcWriteSingleBlockStatusCode`](./6_AsReaderNFCProtocol.md#nfcwritesingleblockstatuscode).**

```objectivec
- (BOOL)writeSingleBlockWithBlockIndex:(int)index writeData:(NSData *)writeData uid:(NSData *)uid;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `index`
  - int
  - Starting block number (0–255)
* - `writeData`
  - NSData
  - Data to write (each block size is 4 bytes)
* - `uid`
  - NSData
  - NFC tag UID data
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `writeBytesWithBlockIndex:writeData:uid:`

Writes data of specified byte length starting from the specified block with the specified UID.  
**After executing this method, the result is called back via [`nfcWriteBytesStatusCode`](./6_AsReaderNFCProtocol.md#nfcwritebytesstatuscode).**

```objectivec
- (BOOL)writeBytesWithBlockIndex:(int)index writeData:(NSData *)writeData uid:(NSData *)uid;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `index`
  - int
  - Starting block number (0–255)
* - `writeData`
  - NSData
  - Data to write (each block size is 4 bytes)
* - `uid`
  - NSData
  - NFC tag UID data
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```

---

## `setInventoryTime`

Sets the reading time.

```objectivec
- (BOOL)setInventoryTime:(float)inventoryTime;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `inventoryTime`
  - float
  - Inventory time
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - `BOOL`
  - Method execution result: YES = success, NO = failure
```