Question

我在网上使用相同的例子

OrderModel.h

@protocol ProductModel
@end

@interface ProductModel : JSONModel
@property (assign, nonatomic) int id;
@property (strong, nonatomic) NSString* name;
@property (assign, nonatomic) float price;
@end

@implementation ProductModel
@end

@interface OrderModel : JSONModel
@property (assign, nonatomic) int order_id;
@property (assign, nonatomic) float total_price;
@property (strong, nonatomic) NSArray<ProductModel>* products;
@end

@implementation OrderModel
@end

但是当我构建项目时，我面临一个问题＆＃34;重复符号＆＃34;

duplicate symbol _OBJC_CLASS_$_OrderModel
ld: 576 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1

Answer 1

@implementation应该出现在.m文件中，而@interface出现在.h文件中。

您应该只导入.h文件。否则，您将为同一个类实现多个实现。

ProductModel.h：

@interface ProductModel : JSONModel
@property (assign, nonatomic) int id;
@property (strong, nonatomic) NSString* name;
@property (assign, nonatomic) float price;
@end

ProductModel.m：

#import "ProductModel.h"    

@implementation ProductModel
@end

OrderModel.h：

@interface OrderModel : JSONModel
@property (assign, nonatomic) int order_id;
@property (assign, nonatomic) float total_price;
@property (strong, nonatomic) NSArray<ProductModel>* products;
@end

OrderModel.m

#import "OrderModel.h"

@implementation OrderModel
@end

如果您想在View Controller中使用ProductModel类，只需导入“ProductModel.h”：

#import "ProductModel.h"

jsonmodel - 模型级联（包括其他模型的模型）

1 个答案: