iOS 自訂對象及子類及模型套模型的拷貝、Archive Storage的通用代碼

標籤：aar   自訂對象   擷取   obj   數組   and   gpo   取值   bsp   

一、runtime實現通用copy

如果自訂類的子類，模型套模型你真的會copy嗎，小心有坑。

copy需要自訂類繼承NSCopying協議

#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];//如果還套了模型也要copy呢            [obj setValue:value forKey:strName];        }        free(ivar);                class = class_getSuperclass(class);//記住還要遍曆父類的屬性呢    }    return obj;}

二、runtime實現通用歸檔解檔

歸檔解檔需要自訂類繼承NSCoding協議

#import <objc/runtime.h>

#pragma mark - 歸檔、解檔- (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);//記住還要遍曆父類的屬性呢    }}- (id)initWithCoder:(NSCoder *)decoder {    self = [super init];    if (self) {                Class class = [self class];        while (class != [NSObject class]) {            unsigned int count = 0;            //擷取類中所有成員變數名            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];                //進行解檔取值                id value = [decoder decodeObjectForKey:strName];                //利用KVC對屬性賦值                [self setValue:value forKey:strName];            }            free(ivar);                        class = class_getSuperclass(class);//記住還要遍曆父類的屬性呢        }    }    return self;}

三、NSUserDefaults儲存自訂對象

//1.自訂類繼承NSCoding協議，並實現歸檔解檔，前面介紹過了，不多說//2.將自訂對象轉NSDataNSData *data = [NSKeyedArchiver archivedDataWithRootObject:student];//3.存到NSUserDefaults[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"myStudent"];[[NSUserDefaults standardUserDefaults] synchronize];//這句要寫，很多人都忘了//4.存數組，數組中包含自訂對象[dataArray addObject:data];//這個data是第2步歸檔得到的data//5.NSUserDefaults只能存不可變數組，不要忘了轉換成不可變NSArray * array = [NSArray arrayWithArray:dataArray];[[NSUserDefaults standardUserDefaults] setObject:array forKey:@"students"];

四、NSUserDefaults中讀取歸檔的自訂對象

NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:@"myStudent"];Student *student = [NSKeyedUnarchiver unarchiveObjectWithData:data];

 

iOS 自訂對象及子類及模型套模型的拷貝、Archive Storage的通用代碼