在项目中，我们常常会用到数据模型，我们会用它来接收数据或者保存数据。你有没有觉的每次使用的时候都很麻烦呢，要写很多代码？不要紧，我们可以写一个数据模型的基础类，每次创建的model类继承它就可以方便使用了，是不是很简单呢！
BaseModel.h
#import <Foundation/Foundation.h>
#import <objc/runtime.h>
@interface BaseModel : NSObject
//接收数据使用
- (id)initWithDictionary:(NSDictionary*)jsonDic;
//归档专用
- (id)initWithCoder:(NSCoder *)aDecoder;
- (void)encodeWithCoder:(NSCoder *)aCoder;
@end
BaseModel.m
#import "BaseModel.h"
@implementation BaseModel
- (id)initWithDictionary:(NSDictionary*)jsonDic
{
if ((self = [super init]))
{
[self setValuesForKeysWithDictionary:jsonDic];
}
return self;
}
- (void)setValue:(id)value forKey:(NSString *)key
{
[super setValue:value forKey:key];
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
NSLog(@"Undefined Key:%@ in %@",key,[self class]);
}
#pragma mark 数据持久化
- (void)encodeWithCoder:(NSCoder *)aCoder
{
unsigned int outCount, i;
objc_property_t *properties =class_copyPropertyList([self class], &outCount);
for (i = 0; i < outCount; i++)
{
objc_property_t property = properties[i];
const char* char_f = property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
id propertyValue = [self valueForKey:(NSString *)propertyName];
if (propertyValue)
{
[aCoder encodeObject:propertyValue forKey:propertyName];
}
}
}
- (id)initWithCoder:(NSCoder *)aCoder
{
self = [super init];
if (self)
{
unsigned int outCount, i;
objc_property_t *properties =class_copyPropertyList([self class], &outCount);
for (i = 0; i<outCount; i++)
{
objc_property_t property = properties[i];
const char* char_f = property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
NSString *capital = [[propertyName substringToIndex:1] uppercaseString];
NSString *setterSelStr = [NSString stringWithFormat:@"set%@%@:",capital,[propertyName substringFromIndex:1]];
SEL sel = NSSelectorFromString(setterSelStr);
[self performSelectorOnMainThread:sel
withObject:[aCoder decodeObjectForKey:propertyName]
waitUntilDone:[NSThread isMainThread]];
}
}
return self;
}
比如说我们有个用户类UserModel继承了BaseModel
UserModel.h
#import "BaseModel.h"
@interface UserModel : BaseModel
@property (nonatomic , copy) NSString *user_name;
@property (nonatomic , copy) NSString *user_image;
@end
UserModel.m
#import "UserModel.h"
@implementation UserModel
-(void)setValue:(id)value forKey:(NSString *)key
{
[super setValue:[NSString stringWithFormat:@"%@",value] forKey:key];
}
@end
在控制器中使用模型接收数据
[self.manager POST:@"此处填上相应的接口" parameters:params progress:^(NSProgress * _Nonnull uploadProgress)//params是接口的参数字典
{
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject)
{
NSDictionary *dic ＝ responseObject[@"data"]//比如说返回的数据中data是我们要接受的数据
UserModel *model = [[UserModel alloc] initWithDictionary:dic];//此处接收数据
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error)
{
NSLog(@"%@--",error);
}];
这样我们就获得了数据，可以用它来对控件赋值，也可以+ (BOOL)archiveRootObject:(id)rootObject toFile:(NSString *)path;来归档数据，而不用在遵守NSCoding，写相应的方法了。是不是很简单了呢？
注：相关内容我会继续更新。如果想找一些iOS方面的代码可以关注我的简书，我会持续更新，大家一起探讨探讨
在此谢谢大家阅读
