最近項目中有一個評價功能，但是遇到了一個問題， 創建不同的數組從數據源中取出標籤數據，再次存儲，發現數據修改後，源數據也有修改，查閱多方資料，是深淺拷貝的問題，雖然多次修改，存儲。new。init ，但是數組中存儲的數據仍然指向源數組所在內存地址 在此作出記錄
實現NSObject+Coding方法
NSObject+Coding
NSObject+Coding.h
/**
* 快速實現NSCoding協議中，編碼和解碼的方法
*/
@interface NSObject (Coding)
/**
* 通過Runtime解碼
*
* @param decoder NSCoder對象
*/
- (void)lxz_decodeWithCoder:(NSCoder *)decoder;
/**
* 通過Runtime編碼
*
* @param coder NSCoder對象
*/
- (void)lxz_encodeWithCoder:(NSCoder *)coder;
/**
* 通過Runtime實現自動copy
*
* @param zone NSZone對象
* @return 新對象
*/
- (id)lxz_copyWithZone:(NSZone *)zone;
NSObject+Coding.m
@implementation NSObject (Coding)
- (void)lxz_decodeWithCoder:(NSCoder *)decoder {
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([self class], &count);
if (ivars) {
for (int i = 0; i < count; i++) {
Ivar ivar = ivars[i];
const char *ivarName = ivar_getName(ivar);
NSString *keyName = [[NSString alloc] initWithUTF8String:ivarName];
id value = [decoder decodeObjectForKey:keyName];
[self setValue:value forKeyPath:keyName];
}
}
free(ivars);
}
- (void)lxz_encodeWithCoder:(NSCoder *)coder {
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([self class], &count);
if (ivars) {
for (int i = 0; i < count; i++) {
Ivar ivar = ivars[i];
const char *ivarName = ivar_getName(ivar);
NSString *keyName = [[NSString alloc] initWithUTF8String:ivarName];
id value = [self valueForKeyPath:keyName];
[coder encodeObject:value forKey:keyName];
}
}
free(ivars);
}
- (id)lxz_copyWithZone:(NSZone *)zone {
NSObject *obj = [[[self class] allocWithZone:zone] init];
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([self class], &count);
if (ivars) {
for (int i = 0; i < count; i++) {
Ivar ivar = ivars[i];
const char *ivarName = ivar_getName(ivar);
NSString *keyName = [[NSString alloc] initWithUTF8String:ivarName];
id value = [self valueForKeyPath:keyName];
if ([value respondsToSelector:@selector(copyWithZone:)]) {
[obj setValue:[value copy] forKey:keyName];
} else {
[obj setValue:value forKey:keyName];
}
}
}
free(ivars);
return obj;
}