前言
- 从CSDN资源下载demo 源码：https://download.csdn.net/download/u011018979/14920529
1、应用场景：打印商品价格标签、打印交易小票 2、特色功能：实现自动连接最近使用的打印机、统一处理蓝牙状态 3、原理文章：https://kunnan.blog.csdn.net/article/details/85684014 4、解决的问题：人民币¥符号乱码的问题 private
- 效果图
价格标签打印（品名支持多行显示）
- 票据打印（自动实现%ns 自动补齐空格的功能）
- 切换佳博打印机的打印模式方法
按住FEED键 和Pause键，再打开开机键开机,
I 、获取标签打印命令
-(NSData *)price_tscCommand{ TscCommand *command = [[TscCommand alloc]init]; [command addSize:40 :60]; [command addGapWithM:2 withN:0]; [command addReference:0 :0]; [command addTear:@"ON"]; [command addQueryPrinterStatus:ON]; [command addCls]; CGFloat marg = 10; CGFloat topY = 5; [command addTextwithX:200 withY:0+topY withFont:@"TSS24.BF2" withRotation:0 withXscal:1 withYscal:1 withText:@"商品名称"];// 字的高度30 // 间距10 //0、Barcode [command addTextwithX:30 withY:30+marg+topY withFont:@"TSS24.BF2" withRotation:0 withXscal:1 withYscal:1 withText:@"2017.01.31"]; [command add1DBarcode:30 :70 :@"CODE128" :100 :1 :0 :2 :2 :@"1kn23456984"]; [command addTextwithX:47 withY:200+marg+topY withFont:@"TSS24.BF2" withRotation:0 withXscal:1 withYscal:1 withText:@"6666.81/件"];// ¥ //1、¥ UIImage *image = [CtrlViewController imageFromText:@"¥" withFont:[UIFont systemFontOfSize:15] withColor:[UIColor blackColor]]; [command addBitmapwithX:30 withY:200+marg withMode:0 withWidth:15 withImage:image]; [command addPrint:1 :1];// M 行 n ：列 打印两份 return [command getCommand]; }
1.1 解决人民币¥符号乱码的问题
/** 将文字转为UIImage，用于打印¥，来避免乱码 */ +(UIImage *)imageFromText:(NSString*)text withFont: (UIFont *)font withColor:(UIColor *)color { CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(MAXFLOAT, MAXFLOAT)]; CGRect rect = CGRectMake(0, 0, size.width, size.height); UIGraphicsBeginImageContextWithOptions(size,YES,0.0); NSMutableParagraphStyle* paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy]; paragraphStyle.lineBreakMode = NSLineBreakByClipping; NSDictionary*attribute = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paragraphStyle, NSForegroundColorAttributeName:color }; //1、针对打印机的特性：字体为黑色，因此设置背景颜色为b白色 CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor); CGContextFillRect(context, CGRectMake(0, 0, 200, 200)); //2、将文字绘画进上下文 [text drawWithRect:rect options:NSStringDrawingUsesLineFragmentOrigin attributes:attribute context:nil]; //3、从上下文获取图片 UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }
II、获取票据打印命令
2.1 门店票据：使用字符串格式化进行排版
完整代码请查看原文
2.2 避免乱码问题，推荐使用%n@ 进行格式化，而非%ns
NSString *text = [NSString stringWithFormat:@"%8@\t%8@\n",column1str,column2str];
- 不推荐的格式化方式
NSString *text = [NSString stringWithFormat:@"%8s\t%8s\n",column1str.UTF8String,column2str.UTF8String];
2.3 自动实现%ns 自动补齐空格的功能
完整代码请查看原文
III、 实现自动连接最近使用的打印机
- (void)connectLastPrint{ __weak __typeof__(self) weakSelf = self; [KNConnecterManagerTool listenBluetoothpoweredState:^(CBPeripheral * _Nullable peripheral) { return [weakSelf setupConnectPeripheral:peripheral]; }]; } -(void) setupConnectPeripheral:(CBPeripheral *_Nullable)peripheral{ if ([peripheral.identifier.UUIDString isEqualToString:KBLUETOOTH]) { NSLog(@"相同则开始连接此蓝牙"); [Manager connectPeripheral:peripheral options:nil timeout:50 connectBlack:^(ConnectState state) { if (state == CONNECT_STATE_CONNECTED) { [Manager stopScan]; // 修改状态 [self setupCONNECT_STATE_CONNECTED:peripheral]; }else if (state == CONNECT_STATE_TIMEOUT || state == CONNECT_STATE_FAILT || state == CONNECT_STATE_DISCONNECT){ if (state == CONNECT_STATE_DISCONNECT) { [self setupCONNECT_STATE_DISCONNECT]; return ; } [SVProgressHUD showInfoWithStatus:@"请尝试重启蓝牙printer"]; [self connectLastPrint]; } } ]; } else{ NSLog(@"未找到该设备"); } } /** * 断开连接 */ - (IBAction)disconnectAction:(id)sender { [Manager close]; } #pragma mark - ******** 连接成功之后的处理,以便connectLastPrint 完整代码请查看原文
宏
#define kUserDefaults [NSUserDefaults standardUserDefaults] #define KBLUETOOTH [kUserDefaults valueForKey:@"blueTooth"]//商户连接过的打印
IV、常见问题
4.1 iOS蓝牙状态的处理【蓝牙关闭及未授权的处理】
- iOS蓝牙状态的处理【蓝牙关闭及未授权的处理】https://blog.csdn.net/z929118967/article/details/107671823
4.2 CBCentralManagerStateUnsupported
如果使用timeout 时间太长容易导致这个问题，修改为时间小些就可以，例如2。
[Manager connectPeripheral:peripheral options:nil timeout:50 connectBlack:^(ConnectState state) {
