反射--> 解析JSON数据

2018-02-26 08:18:39来源:cnblogs.com作者:Harely人点击

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方法一

Persons.json文件

[ { "name": "Chris", "age": 18, "city": "Shanghai", "job": "iOS" }, { "name": "Ada", "age": 16, "city": "Beijing", "job": "student" }, { "name": "Rita", "age": 17, "city": "Xiamen", "job": "HR" } ]

 Model.h类

 1 #import <Foundation/Foundation.h> 2  3 @interface PersonModel : NSObject 4  5 @property (nonatomic, copy) NSString *name; 6 @property (nonatomic, assign) NSInteger age; 7 @property (nonatomic, copy) NSString *city; 8 @property (nonatomic, copy) NSString *job; 9 @property (nonatomic, copy) NSString *sex;10 11 - (instancetype)initWithNSDictionary:(NSDictionary *)dict;12 13 @end

Model.m类

 1 #import "PersonModel.h" 2 #import <objc/runtime.h> 3  4 @implementation PersonModel 5  6 - (instancetype)initWithNSDictionary:(NSDictionary *)dict { 7     self = [super init]; 8     if (self) { 9         [self prepareModel:dict];10     }11     return self;12 }13 14 - (void)prepareModel:(NSDictionary *)dict {15     NSMutableArray *keys = [[NSMutableArray alloc] init];16     17     u_int count = 0;18     objc_property_t *properties = class_copyPropertyList([self class], &count);19     for (int i = 0; i < count; i++) {20         objc_property_t property = properties[i];21         const char *propertyCString = property_getName(property);22         NSString *propertyName = [NSString stringWithCString:propertyCString encoding:NSUTF8StringEncoding];23         [keys addObject:propertyName];24     }25     free(properties);26     27     for (NSString *key in keys) {28         if ([dict valueForKey:key]) {29             [self setValue:[dict valueForKey:key] forKey:key];30         }31     }32 }33 34 @end

调用

1 NSString *file = [[NSBundle mainBundle] pathForResource:@"Persons" ofType:@"json"];2     NSData *data = [NSData dataWithContentsOfFile:file];3     NSMutableArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];4     5     for (NSDictionary *model in array) {6         PersonModel *person = [[PersonModel alloc] initWithNSDictionary:model];7         NSLog(@"%@, %ld, %@, %@", person.name, (long)person.age, person.city, person.job);8     }

打印结果:


方法二

数据模型的父类是:JSONModel

JSONModel的子类是:JSONPerson, JSONStudent, JSONTeacther等;

JSONStudent.h中

 1 @import JSONModel; 2  3 @interface JSONStudent : JSONModel 4  5 @property (nonatomic, copy) NSString * id; 6 @property (nonatomic, copy) NSString * name; 7 @property (nonatomic, copy) NSString * nickName; 8 @property (nonatomic, copy) NSString * phoneNumber; 9 10 @end

注意:这是用OC来写的!

 

获取属性 

 1 func getAllProperties<T: JSONModel>(anyClass: T) -> [String] { 2         var properties = [String]() 3         let count = UnsafeMutablePointer<UInt32>.allocate(capacity: 0) 4         let buff = class_copyPropertyList(object_getClass(anyClass), count) 5         let countInt = Int(count[0]) 6          7         for i in 0..<countInt { 8             let temp = buff![i] 9             let tempPro = property_getName(temp)10             let proper = String(utf8String: tempPro!)11             properties.append(proper!)12         }13         return properties14         15     }

注意:获取属性使用Swift写的,单纯用Swift和OC要简单!

使用

1 func returnListStudent(students: [JSONStudent]) {2         for item in students {3             let studentProperties = self.getAllProperties(anyClass: item)4             for i in 0..< studentProperties.count{5                 print("值是:/(item.value(forKey: studentProperties[I]))" + "属性是:/(studentProperties[i])"self.dataError)6             }7         }8     }

方法三

User.swift

1 import UIKit2 3 class User: NSObject {4     var name:String = ""  //姓名5     var nickname:String?  //昵称6     var age:Int?   //年龄7     var emails:[String]?  //邮件地址8 }

Mirror

属性

//    实例化let user = User()let mirror: Mirror = Mirror(reflecting:user)//    subjectType:对象类型print(mirror.subjectType) // 打印出:User//    children:反射对象的属性集合//    displayStyle:反射对象展示类型// advance 的使用let children = mirror.childrenlet p0 = advance(children.startIndex, 0, children.endIndex) // name 的位置let p0Mirror =  Mirror(reflecting: children[p0].value) // name 的反射print(p0Mirror.subjectType) //Optional<String> 这个就是name 的类型

调用:

 1     @objc func testOne() { 2 //        得到应用名称 3         let nameSpace = Bundle.main.object(forInfoDictionaryKey: "CFBundleName") as! String 4         let clsName = "User" 5 //        使用NSClassFromString通过类名得到实例(得到类的完整路径, 注意分隔符是小数点;并判断数据类型是否符合预期。 备注: as?后面的格式是类名.Type, cls可能是nil) 6         guard let cls = NSClassFromString(nameSpace + "." + clsName) as? NSObject.Type else { return }  //得到类完整路径 7         print("------_>/(cls)") 8         let user = cls.init() 9         print("------111111_>/(user)")10         11 //        使用Mirror得到属性值12         let mirror = Mirror(reflecting: user)13         for case let(key?, value) in mirror.children {14             print("key:/(key), value: /(value)")    //打印成员属性15         }16         print(mirror.subjectType)    //反射对象的数据类型</span>17 18     }

打印:

 

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