最近项目中有一个评价功能，但是遇到了一个问题， 创建不同的数组从数据源中取出标签数据，再次存储，发现数据修改后，源数据也有修改，查阅多方资料，是深浅拷贝的问题，虽然多次修改，存储。new。init ，但是数组中存储的数据仍然指向源数组所在内存地址 在此作出记录
实现NSObject+Coding方法
NSObject+Coding
NSObject+Coding.h
/**
* 快速实现NSCoding协议中，编码和解码的方法
*/
@interface NSObject (Coding)
/**
* 通过Runtime解码
*
* @param decoder NSCoder对象
*/
- (void)lxz_decodeWithCoder:(NSCoder *)decoder;
/**
* 通过Runtime编码
*
* @param coder NSCoder对象
*/
- (void)lxz_encodeWithCoder:(NSCoder *)coder;
/**
* 通过Runtime实现自动copy
*
* @param zone NSZone对象
* @return 新对象
*/
- (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;
}