flutter_jc_printer_plugin/ios/Classes/JcPrinterPlugin.m

#import "JcPrinterPlugin.h"
#import <JCPrinterSDK/JCPrinterSDK.h>

@implementation JcPrinterPlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
    FlutterMethodChannel* channel = [FlutterMethodChannel methodChannelWithName:@"jc_printer" binaryMessenger:[registrar messenger]];
    
    JcPrinterPlugin* instance = [[JcPrinterPlugin alloc] init];
    [registrar addMethodCallDelegate:instance channel:channel];
    
    FlutterEventChannel* eventChannel = [FlutterEventChannel eventChannelWithName:@"printer_stream"  binaryMessenger:[registrar messenger]];
    [eventChannel setStreamHandler:instance];
    
}

- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
    // NSLog(@"arguments is :%@", call.arguments);
    
    [self printingCount];
    [self errorInfo];
    
    if ([@"getPlatformVersion" isEqualToString:call.method]) {
        result([@"iOS " stringByAppendingString:[[UIDevice currentDevice] systemVersion]]);
    } else if ([@"connect" isEqualToString:call.method]) {
        [self connect:call.arguments];
        result(nil);
    } else if ([@"disconnect" isEqualToString:call.method]) {
        [self disconnect];
        result(nil);
    } else if ([@"setTotalPrints" isEqualToString:call.method]) {
        [self setTotalPrints:call.arguments];
        result(nil);
    } else if ([@"initDrawingBoard" isEqualToString:call.method]) {
        [self initDrawingBoard:call.arguments result:result];
    } else if ([@"drawLabelImage" isEqualToString:call.method]) {
        [self drawLabelImage:call.arguments result:result];
    } else if ([@"drawLabelText" isEqualToString:call.method]) {
        [self drawLabelText:call.arguments result:result];
    } else if ([@"drawLabelBarcode" isEqualToString:call.method]) {
        [self drawLabelBarcode:call.arguments result:result];
    } else if ([@"getLabelData" isEqualToString:call.method]) {
        [self getLabelData:result];
    } else if ([@"startJob" isEqualToString:call.method]) {
        [self startJob:call.arguments result:result];
    } else if ([@"endJob" isEqualToString:call.method]) {
        [self endJob:result];
    } else if ([@"commit" isEqualToString:call.method]) {
        [self commit:call.arguments result:result];
    } else {
        result(FlutterMethodNotImplemented);
    }
}

- (void) disconnect {
    [JCAPI closePrinter];
}

- (void) setTotalPrints:(NSString *)args {
    NSInteger page = [args integerValue];
    [JCAPI setTotalQuantityOfPrints:page];
}

- (void)initDrawingBoard:(NSDictionary *)args result:(FlutterResult)result {
    NSNumber *width = args[@"width"];
    NSNumber *height = args[@"height"];
    NSNumber *horizontalShift = args[@"horizontalShift"];
    NSNumber *verticalShift = args[@"verticalShift"];
    NSNumber *rotate = args[@"rotate"];
    NSString *font = args[@"font"];
    
    [JCAPI initDrawingBoard:width.floatValue withHeight:height.floatValue withHorizontalShift:horizontalShift.floatValue withVerticalShift:verticalShift.floatValue rotate:rotate.intValue font:font];
    result(nil);
}

- (void)drawLabelImage:(NSDictionary *)args result:(FlutterResult)result {
    NSNumber *x = args[@"x"];
    NSNumber *y = args[@"y"];
    NSNumber *width = args[@"width"];
    NSNumber *height = args[@"height"];
    NSNumber *rotate = args[@"rotate"];
    NSNumber *type = args[@"type"];
    NSNumber *threshold = args[@"threshold"];
    NSString *base64 = args[@"base64"];
    
    BOOL isSuccess = [JCAPI DrawLableImage:x.floatValue withY:y.floatValue withWidth:width.floatValue withHeight:height.floatValue withImageData:base64 withRotate:rotate.intValue withImageProcessingType:type.intValue withImageProcessingValue:threshold.floatValue];
    result(@(isSuccess));
}

- (void)drawLabelText:(NSDictionary *)args result:(FlutterResult)result {
    NSNumber *x = args[@"x"];
    NSNumber *y = args[@"y"];
    NSNumber *width = args[@"width"];
    NSNumber *height = args[@"height"];
    NSNumber *fontSize = args[@"fontSize"];
    NSNumber *rotate = args[@"rotate"];
    NSNumber *textAlignHorizontal = args[@"textAlignHorizontal"];
    NSNumber *textAlignVertical = args[@"textAlignVertical"];
    NSNumber *lineMode = args[@"lineMode"];
    NSNumber *letterSpacing = args[@"letterSpacing"];
    NSNumber *lineSpacing = args[@"lineSpacing"];
    NSString *content = args[@"content"];
    
    BOOL isSuccess = [JCAPI drawLableText:x.floatValue withY:y.floatValue withWidth:width.floatValue withHeight:height.floatValue withString:content withFontFamily:@"" withFontSize:fontSize.floatValue withRotate:rotate.intValue withTextAlignHorizonral:textAlignHorizontal.intValue withTextAlignVertical:textAlignVertical.intValue withLineMode:lineMode.intValue withLetterSpacing:letterSpacing.floatValue withLineSpacing:lineSpacing.floatValue withFontStyle:@[@0,@0,@0,@0]];
    result(@(isSuccess));
}

- (void)drawLabelBarcode:(NSDictionary *)args result:(FlutterResult)result {
    NSNumber *x = args[@"x"];
    NSNumber *y = args[@"y"];
    NSNumber *width = args[@"width"];
    NSNumber *height = args[@"height"];
    NSNumber *fontSize = args[@"fontSize"];
    NSNumber *rotate = args[@"rotate"];
    NSNumber *codeType = args[@"codeType"];
    NSNumber *textPosition = args[@"textPosition"];
    NSNumber *textHeight = args[@"textHeight"];
    NSString *text = args[@"text"];
    
    BOOL isSuccess = [JCAPI drawLableBarCode:x.floatValue withY:y.floatValue withWidth:width.floatValue withHeight:height.floatValue withString:text withFontSize:fontSize.floatValue withRotate:rotate.intValue withCodeType:codeType.intValue withTextHeight:textHeight.floatValue withTextPosition:textPosition.intValue];
    result(@(isSuccess));
}

- (void)getLabelData:(FlutterResult)result {
    NSString *data = [JCAPI GenerateLableJson];
    result(data);
}

- (void)startJob:(NSDictionary *)args result:(FlutterResult)result {
    NSNumber *blackRules = args[@"blackRules"];
    NSNumber *paperStyle = args[@"paperStyle"];
    [JCAPI startJob:blackRules.intValue withPaperStyle:paperStyle.intValue withCompletion:^(BOOL isSuccess) {
        result(@(isSuccess));
    }];
}

- (void)commit:(NSDictionary *)args result:(FlutterResult)result {
    NSString *data = args[@"data"];
    NSNumber *count = args[@"count"];
    [JCAPI commit:data withOnePageNumbers:count.intValue withComplete:^(BOOL isSuccess) {
        result(@(isSuccess));
    }];
}

- (void)endJob:(FlutterResult)result {
    [JCAPI endPrint:^(BOOL isSuccess) {
        result(@(isSuccess));
    }];
}

#pragma mark - FlutterStreamHandler

- (FlutterError *)onListenWithArguments:(id)arguments eventSink:(FlutterEventSink)events {
    self.eventSink = events;
    return nil;
}

- (FlutterError *)onCancelWithArguments:(id)arguments {
    return nil;
}

- (void)connect:(NSString *)name {
    [JCAPI openPrinter:name completion:^(BOOL isSuccess) {
        NSDictionary *params = @{
            @"type": @"connectState",
            @"result": @(isSuccess),
        };
        !self.eventSink ? : self.eventSink(params);
    }];
}

-(void)errorInfo {
    [JCAPI getPrintingErrorInfo:^(NSString *printInfo) {
        NSDictionary *params = @{
            @"type": @"errorInfo",
            @"result": printInfo,
        };
        !self.eventSink ? : self.eventSink(params);
    }];
}

- (void)printingCount {
    [JCAPI getPrintingCountInfo:^(NSDictionary *printDicInfo) {
        NSDictionary *params = @{
            @"type": @"printingCount",
            @"result": printDicInfo,
        };
        !self.eventSink ? : self.eventSink(params);
    }];
}

@end