前言

应用场景：打印商品价格标签、打印交易小票

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

解决的问题：人民币¥符号乱码的问题

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）

从CSDN资源下载demo 源码：https://download.csdn.net/download/u011018979/14920529

private

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

#pragma mark - ******** 使用字符串格式化进行票据布局
+ (void) setupStoreListcommand:(EscCommand*)command name:(NSString*)name count:(char*)count price:(char*)price sum:(char*)sum {
    
//    [count ]
    
    [command addSetJustification:0];
    
    
    [command addText:[NSString stringWithFormat:@"%@\n",name]];
    
    
    [command addSetJustification:2];
    
    /**
     %3s, 格式输出字符串，右对齐，超出3个长度的，就全部输出；
     %7.2s, 输出字符串占7个位置，右对齐，左补空格，输出2个字符；
     %-5.3s: 输出3个字符，占位5个位置，左对齐右补空格。
     %.4s, 仅输出4个字符，占位4个位置，右对齐；
     */
    
    [command addText:[NSString stringWithFormat:@"%5s %8s %8s\n",count,price,sum]];
}

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

#pragma mark - ******** 使用字符串格式化进行票据布局：2列
+ (void) setupStoreListcommand:(EscCommand*)command column1Name:(NSString*)column1Name column1Value:(NSString*)column1Value  column2Name:(NSString*)column2Name column2Value:(NSString*)column2Value{
    

    NSString *column1str = [NSString stringWithFormat:@"%@:%@",column1Name,column1Value];
    
    NSString *column2str = [NSString stringWithFormat:@"%@:%@",column2Name,column2Value];
    
    
    
    
    [command addSetJustification:0];
    /**
     %3s, 格式输出字符串，右对齐，超出3个长度的，就全部输出；
     %7.2s, 输出字符串占7个位置，右对齐，左补空格，输出2个字符；
     %-5.3s: 输出3个字符，占位5个位置，左对齐右补空格。
     %.4s, 仅输出4个字符，占位4个位置，右对齐；
     */
    //因为char是无编码的 存的是纯数据
//    kCFStringEncodingGBK_95
    //NSString 中保存的是UTF8编码的数据，%s输出的是ASCII吗的数据，UTF8编码的中文字符用ASCII码方式输出，必然是乱码。
    
//    char tmp = [column1str characterAtIndex:0];
    
    NSString *text = [NSString stringWithFormat:@"%8@\t%8@\n",[self addRightComplementspaces:column1str count:8],[self addRightComplementspaces:column2str count:8]];
//    NSString *text = [NSString stringWithFormat:@"%8s\t%8s\n",column1str.UTF8String,column2str.UTF8String];
//        String.format("%-4s%-8s%-10s%-4s","","1243KG", "850000.00","850000.00");
    [command addText:text];
}

// 自己创建一个自动补齐空格的方式

+ (NSString*)addComplementspaces:(NSString*)str count:(NSInteger)count{
    
    if (str.length>=count) {
        return str;
    }
    
    NSMutableString *tmp = [NSMutableString new];
    NSInteger tmpcount = count -str.length;
    for (int i =0; i< tmpcount; i++) {
        [tmp appendString:@" "];// 往左边补齐空格
    }
    [tmp appendString:str];// 往左边补齐空格
    return tmp;
}


// 自己创建一个自动往右补齐空格的方式

+ (NSString*)addRightComplementspaces:(NSString*)str count:(NSInteger)count{
    
    if (str.length>=count) {
        return str;
    }
    
    NSMutableString *tmp = [[NSMutableString alloc]initWithString:str];
    NSInteger tmpcount = count -str.length;
    for (int i =0; i< tmpcount; i++) {
        [tmp appendString:@" "];// 往右边补齐空格
    }
    return tmp;
}

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

- (void) setupCONNECT_STATE_CONNECTED:(CBPeripheral*)peripheral{
    self.connState.text = [NSString stringWithFormat:@"%@%@",@"连接状态：已连接",peripheral.name];
    [SVProgressHUD showInfoWithStatus:@"连接成功"];
    //                [SVProgressHUD show
    [self.navigationController popViewControllerAnimated:YES];
    
    //1、保持连接成功之后的信息
    NSUserDefaults *user = [NSUserDefaults standardUserDefaults];
    [user setValue:peripheral.identifier.UUIDString forKey:@"blueTooth"];
    [user setValue:peripheral.name forKey:@"blueName"];
    [user synchronize];
}

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】

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) {

V、 see also

更多内容请关注 #小程序：iOS逆向,只为你呈现有价值的信息，专注于移动端技术研究领域；更多服务和咨询请关注#公众号：iOS逆向。

iOS小技能：蓝牙打印商品价签和交易小票的模版

前言