运行时机制重写descrption实现实体模型数据打印查看

水深无声 2022-05-20 06:07 40阅读 0赞

使用前打印实体模型时，结果是这样的

(lldb) po self.userModel
    <SXLoginModel: 0x7fb08bc36aa0>

使用后打印实体模型时，结果是这样的

(lldb) po [self.userModel descriptionShow]
    
    deptName : 南京校区;
    lastSigninTime : 2018-07-13 16:16:56;
    roleList : ( "<SXRoleModel: 0x600000284060>" );
    sex : 2;
    source : 1;
    state : 1;
    xiaoNengId : liuluqing;
    zuoXiId : ;

(lldb) po [self.userModel.roleList.firstObject descriptionShow]
    
    descn : (null);
    roleId : 2e34ff21224541d;
    roleName : 中端军团长;
    state : 1;

代码实现

#import <Foundation/Foundation.h>
    #import <UIKit/UIKit.h>
    
    @interface NSObject (SYCategory)
    
    /// 实体模型属性打印
    - (NSString *)descriptionShow;
    
    @end
    
    #import "NSObject+SYCategory.h"
    #import <objc/runtime.h>
    
    @implementation NSObject (SYCategory)
    
    /// 实体模型属性打印
    - (NSString *)descriptionShow
    {
        NSString *message = @"\n";
        unsigned int outCount;
        objc_property_t *properties = class_copyPropertyList([self class], &outCount);
        for (int i = 0; i < outCount; i ++)
        {
            objc_property_t property = properties[i];
            const char *propName = property_getName(property);
            if (propName)
            {
                NSString *key = [NSString stringWithCString:propName encoding:[NSString defaultCStringEncoding]];
                id value = [self valueForKey:key];
                message = [message stringByAppendingFormat:@"%@ : %@;\n", key, value];
            }
        }
        free(properties);
        return message;
    }
    
    @end