一、runtime实现通用copy
如果自定义类的子类,模型套模型你真的会copy吗,小心有坑。
copy需要自定义类继承NSCopying协议
#import <objc/runtime.h> - (id)copyWithZone:(NSZone *)zone { id obj = [[[self class] allocWithZone:zone] init]; Class class = [self class]; while (class != [NSObject class]) { unsigned int count; Ivar *ivar = class_copyIvarList(class, &count); for (int i = 0; i < count; i++) { Ivar iv = ivar[i]; const char *name = ivar_getName(iv); NSString *strName = [NSString stringWithUTF8String:name]; //利用KVC取值 id value = [[self valueForKey:strName] copy];//如果还套了模型也要copy呢 [obj setValue:value forKey:strName]; } free(ivar); class = class_getSuperclass(class);//记住还要遍历父类的属性呢 } return obj; }
二、runtime实现通用归档解档
归档解档需要自定义类继承NSCoding协议
#import <objc/runtime.h> #pragma mark - 归档、解档 - (void)encodeWithCoder:(NSCoder *)encoder { Class class = [self class]; while (class != [NSObject class]) { unsigned int count; Ivar *ivar = class_copyIvarList(class, &count); for (int i = 0; i < count; i++) { Ivar iv = ivar[i]; const char *name = ivar_getName(iv); NSString *strName = [NSString stringWithUTF8String:name]; //利用KVC取值 id value = [self valueForKey:strName]; [encoder encodeObject:value forKey:strName]; } free(ivar); class = class_getSuperclass(class);//记住还要遍历父类的属性呢 } } - (id)initWithCoder:(NSCoder *)decoder { self = [super init]; if (self) { Class class = [self class]; while (class != [NSObject class]) { unsigned int count = 0; //获取类中所有成员变量名 Ivar *ivar = class_copyIvarList(class, &count); for (int i = 0; i < count; i++) { Ivar iva = ivar[i]; const char *name = ivar_getName(iva); NSString *strName = [NSString stringWithUTF8String:name]; //进行解档取值 id value = [decoder decodeObjectForKey:strName]; //利用KVC对属性赋值 [self setValue:value forKey:strName]; } free(ivar); class = class_getSuperclass(class);//记住还要遍历父类的属性呢 } } return self; }
三、NSUserDefaults存储自定义对象
//1.自定义类继承NSCoding协议,并实现归档解档,前面介绍过了,不多说 //2.将自定义对象转NSData NSData *data = [NSKeyedArchiver archivedDataWithRootObject:student]; //3.存到NSUserDefaults [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"myStudent"]; [[NSUserDefaults standardUserDefaults] synchronize];//这句要写,很多人都忘了 //4.存数组,数组中包含自定义对象 [dataArray addObject:data];//这个data是第2步归档得到的data //5.NSUserDefaults只能存不可变数组,不要忘了转换成不可变 NSArray * array = [NSArray arrayWithArray:dataArray]; [[NSUserDefaults standardUserDefaults] setObject:array forKey:@"students"];
四、NSUserDefaults中读取归档的自定义对象
NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:@"myStudent"]; Student *student = [NSKeyedUnarchiver unarchiveObjectWithData:data];
原文地址:https://www.cnblogs.com/zhanglinfeng/p/8418407.html
时间: 2024-10-01 12:25:04