缓存符合NSCoding协议的任意对象
- (void)encodeWithCoder:(NSCoder *)coder;
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
example
override func encode(with coder: NSCoder) {
super.encode(with: coder)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
super.init(nibName: nibNameOrNil, bundle: nil)
}
convenience init() {
self.init(nibName: nil, bundle: nil)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if YAuth.isLoggedIn {
interactor.getMessageCount()
}
if let libraryPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true).last {
let directory = libraryPath + "/archiver_directory"
if !FileManager.default.fileExists(atPath: directory) {
try? FileManager.default.createDirectory(atPath: directory, withIntermediateDirectories: true, attributes: nil)
}
let data = NSMutableData()
let archiver = NSKeyedArchiver(forWritingWith: data)
archiver.encode(UIViewController(), forKey: "archiver_key")
archiver.finishEncoding()
data.write(to: URL.init(fileURLWithPath: directory + "/file_name"), atomically: true)
}
GCDQueue.executeInMainQueue({
if let libraryPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true).last {
let directory = libraryPath + "/archiver_directory"
if let data = NSData(contentsOfFile: directory + "/file_name") as Data? {
let unarchiver = NSKeyedUnarchiver.init(forReadingWith: data)
if let vc = unarchiver.decodeObject(forKey: "archiver_key") as? UIViewController {
self.present(vc, animated: true, completion: nil)
}
}
}
}, afterDelay: .seconds(10))
}
Codable协议
typealias Codable = Decodable & Encodable
public protocol Decodable {
init(from decoder: Decoder) throws
}
public protocol Encodable {
func encode(to encoder: Encoder) throws
}
JSONEncoder
struct GroceryProduct: Codable {
var name: String
var points: Int
var description: String?
}
let pear = GroceryProduct(name: "Pear", points: 250, description: "A ripe pear.")
let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted
let data = try encoder.encode(pear)
print(String(data: data, encoding: .utf8)!)
/* Prints:
{
"name" : "Pear",
"points" : 250,
"description" : "A ripe pear."
}
*/
JSONDecoder
struct GroceryProduct: Codable {
var name: String
var points: Int
var description: String?
}
let json = """
{
"name": "Durian",
"points": 600,
"description": "A fruit with a distinctive scent."
}
""".data(using: .utf8)!
let decoder = JSONDecoder()
let product = try decoder.decode(GroceryProduct.self, from: json)
print(product.name) // Prints "Durian"
自定义嵌入键
class User: Codable {
var name: String?
// 自定义嵌入键
enum CodingKeys: String, CodingKey {
case memberName
}
required init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
name = try container.decode(String.self, forKey: .memberName)
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(name, forKey: .memberName)
}
init() {
}
}
let jsonData = """
{
"memberName": "Janine",
}
""".data(using: .utf8)!
func test() {
do {
let user = try? JSONDecoder().decode(User.self, from: jsonData)
let data = try? JSONEncoder().encode(user)
print(user.debugDescription)
print(data?.description)
} catch {
print(error.localizedDescription)
}
}
NSCoding & NSKeyedArchiver & Data Parsing
#import "DataModel.h"
#import <objc/runtime.h>
@implementation DataModel
- (NSArray *)getAllPropertyNames //获取类的所有属性名称
{
u_int count;
objc_property_t *properties =class_copyPropertyList([self class], &count);
NSMutableArray *propertiesArray = [NSMutableArray arrayWithCapacity:count];
for (int i = 0; i < count ; i++)
{
const char* propertyName =property_getName(properties[i]);
[propertiesArray addObject: [NSString stringWithUTF8String: propertyName]];
}
free(properties);
return propertiesArray;
}
- (id)bundingData:(NSDictionary *)dict{ //绑定数据
static Class oldClass;
if ([self class]!=oldClass) {
DLog(@" >>>>>>> 绑定模型 >>>>>>>>>> ： %@\n\n",[self class]);
oldClass = [self class];
}
if (dict==nil) {
return nil;
}
NSArray *propertyNames = [self getAllPropertyNames];
for (NSString *key in propertyNames) {
id value = nil;
if ([key isEqualToString:@"pid"]) {
value = [dict objectForKeyOrNil:@"id"];
}else{
value = [dict objectForKeyOrNil:key];
}
if (value) {
[self setValue:value forKey:key]; //使用KVC给属性赋值
}
}
return self;
}
- (NSDictionary *)toDictionary{
NSArray *propertyKeyArray = [self getAllPropertyNames];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSString *key in propertyKeyArray) {
id obj = SafeObj([self valueForKey:key]);
//对象为空则不转换到Dictionary中
if ((NSNull *)obj == [NSNull null]) {
continue;
}
if ([key isEqualToString:@"pid"]) {
[dict setObject:obj forKey:@"id"];
}else{
[dict setObject:obj forKey:key];
}
}
return dict;
}
- (void)clearData{ //清除对象的值
// DLog(@"%@",self); //输出调试信息
NSArray *propertyNames = [self getAllPropertyNames];
for (NSString *key in propertyNames) {
[self setValue:[NSNull null] forKey:key]; //使用KVC给属性赋值,清除对象的值
}
DLog(@"清除类 ------ > %@ (%@)",NSStringFromClass([self class]),self);
}
- (NSString *)description //类描述方法
{
NSMutableString *desc = [NSMutableString string];
[desc appendString:@"\n\n"];
[desc appendFormat:@"Class name: %@\n", NSStringFromClass([self class])];
NSArray *propertyNames = [self getAllPropertyNames];
for (NSString *key in propertyNames) {
[desc appendFormat: @"%@: %@\n", key, [self valueForKey:key]];
}
return [NSString stringWithString:desc];
}
#pragma -mark 对象归档协议<NSCoding>方法
- (void)encodeWithCoder:(NSCoder *)encoder {
NSArray *propertyNames = [self getAllPropertyNames];
for (NSString *key in propertyNames) {
[encoder encodeObject:[self valueForKey:key] forKey:key];
}
}
- (id)initWithCoder:(NSCoder *)decoder {
NSArray *propertyNames = [self getAllPropertyNames];
for (NSString *key in propertyNames) {
[self setValue:[decoder decodeObjectForKey:key] forKey:key] ;
}
return self;
}
#pragma -mark 对象归档
- (void)archiverToFile:(NSString *)fileName{ //对象归档保存
NSString *fullPath = [self getDocumentsPath:fileName];
[NSKeyedArchiver archiveRootObject:self toFile:fullPath];
}
- (id)unArchiverFromFile:(NSString *)fileName{ //反归档对象
NSString *fullPath = [self getDocumentsPath:fileName];
if ([[NSFileManager defaultManager] fileExistsAtPath:fullPath]){
DataModel *model = [NSKeyedUnarchiver unarchiveObjectWithFile: fullPath];
return model;
}else{
return nil;
}
}
#pragma -mark 辅助方法
- (NSString *)getDocumentsPath:(NSString *)fileName{ //获取文档目录
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths objectAtIndex:0];
return [docPath stringByAppendingPathComponent:fileName];
}
@end
