想着归档，想着model，突然想到其实我们平常字典转model 的需求其实是更常见的，因此此处也继续笔记下。
依然是先从最原始的字典转model，当然我们有时用 字典快速赋值 是最直接的。
- (void)setValuesForKeysWithDictionary:(NSDictionary<NSString *, id> *)keyedValues;
然而有时，我们还是得类似下面这样：
#import <Foundation/Foundation.h>
@interface UserModel : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) NSInteger age;
- (instancetype)initWithDictionary:(NSDictionary *)dictionary;
@end
#import "UserModel.h"
NSString *const kNameKey = @"name";
NSString *const kAgeKey = @"age";
@implementation UserModel
- (instancetype)initWithDictionary:(NSDictionary *)dictionary {
self = [super init];
if (self) {
self.name = dictionary[kNameKey];
self.age = [dictionary[kAgeKey] integerValue];
}
return self;
}
依然还是那种需求，当属性特别多的时候，我们就可以用 rumtime 进行字典转model 就简化啦
#import <Foundation/Foundation.h>
@interface TestModel : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) NSInteger age;
@property (nonatomic, strong) NSDictionary * testDic;
@property (nonatomic, strong) NSArray * testArray;
- (instancetype)initWithDictionary:(NSDictionary *)dictionary;
@end
#import "TestModel.h"
#import <objc/runtime.h>
#import <objc/message.h>
@implementation TestModel
- (instancetype)initWithDictionary:(NSDictionary *)dictionary {
self = [super init];
if (self) {
NSMutableArray * keyArray = [NSMutableArray array];
unsigned int outCount = 0 ;
//获取该类的属性列表 class_copyPropertyList
objc_property_t * propertys = class_copyPropertyList([self class], &outCount);
for (int i = 0 ; i < outCount; i++) {
objc_property_t property = propertys[i];
//获取属性对应的名称 property_getName
NSString * propertyName = [NSString stringWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
[keyArray addObject:propertyName];
}
//记得要释放
free(propertys);
for (NSString * key in keyArray) {
NSArray * keyArray = [dictionary allKeys];
// 先做一个判断
if (![keyArray containsObject:key]||[dictionary valueForKey:key] == nil) {
continue ;
}
[self setValue:[dictionary valueForKey:key] forKey:key];
}
}
return self;
}
经过测试是OK的
NSDictionary *testReusltDic = @{@"name":@"Yang",
@"age":@"6",
@"testArray":@[@"1",@"2"],
@"testDic":@{@"one":@"1",@"two":@"2"}};
TestModel * model = [[TestModel alloc] initWithDictionary:testReusltDic];
NSLog(@"name ==== %@, age == %ld, testDic===%@, testArray === %@",model.name,model.age,model.testDic,model.testArray);
// output: name ==== Yang, age == 6, testDic==={one = 1;two = 2;}, testArray === (1, 2)
当然model 也可以通过runtime 转换成字典的。
