标签：
mian.m
int main(int argc, const char * argv[]) {
@autoreleasepool {
[[NSObject alloc] init];
}
return 0;
}使用终端命令行切换到mian.m文件所在的目录下并执行： clang -rewrite-objc main.m
<span style="font-weight: normal;">#import <Foundation/Foundation.h>
@interface Person : NSObject
@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSString *address;
@property (assign, nonatomic)int age;
@property (assign, nonatomic)double hight;
@property (assign, nonatomic)BOOL gender;
+ (void)run;
- (void)study;
@end
//--------------------------------------------------------------------------------------
#import "Person.h"
@implementation Person
+ (void)run {
NSLog(@"run。。。");
}
- (void)study {
NSLog(@"study...");
}
@end
//--------------------------------------------------------------------------------------
int main(int argc, const char * argv[]) {
@autoreleasepool {
Method runMethod = class_getClassMethod([Person class], @selector(run));
Method studyMethod = class_getInstanceMethod([Person class], @selector(study));
method_exchangeImplementations(runMethod, studyMethod);
[Person run]; // 打印 study...
[[[Person alloc] init] study]; // 打印 run。。。
}
return 0;
}</span>#import <Foundation/Foundation.h>
#import <objc/runtime.h>
@interface Person (AddProperty)
@property (copy, nonatomic) NSString *name;
@end
#import "Person+AddProperty.h"
@implementation Person (AddProperty)
- (void)setName:(NSString *)name {
objc_setAssociatedObject(self, "name", name, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (NSString *)name {
return objc_getAssociatedObject(self, "name");
}
@end
//------------------------------------------------------------------------------
#import <Foundation/Foundation.h>
#import "Person+AddProperty.h"
#import "Person.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
Person *person = [[Person alloc] init];
person.name = @"小红";
NSLog(@"使用类别(分类)间接为类添加属性, person.name = %@", person.name);
}
return 0;
}int main(int argc, const char * argv[]) {
@autoreleasepool {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList([Person class], &outCount);
for (int i = 0; i < outCount; i++) {
Ivar ivar = ivars[i];
const char* name = ivar_getName(ivar);
const char* type = ivar_getTypeEncoding(ivar);
NSLog(@"%s :%s", name, type);
}
free(ivars);
}
return 0;
}
2016-07-19 17:48:28.788 Runtime[13864:3404989] _gender :c
2016-07-19 17:48:28.789 Runtime[13864:3404989] _age :i
2016-07-19 17:48:28.789 Runtime[13864:3404989] _address :@"NSString"
2016-07-19 17:48:28.789 Runtime[13864:3404989] _hight :d
Program ended with exit code: 0static void display(id self, SEL _cmd){
NSLog(@"invoke method with selector %@ on %@ instance", NSStringFromSelector(_cmd), [self class]);
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
// 1. 创建一个类对
Class WidgetClass = objc_allocateClassPair([NSObject class], "Widget", 0);
// 2. 为该类添加一个方法
class_addMethod(WidgetClass, @selector(display), (IMP)display, "v@:");
// 3. 为该类添加一个实例变量
class_addIvar(WidgetClass, "height", sizeof(id), rint(log2(sizeof(id))), @encode(id));
// 4. 注册类对
objc_registerClassPair(WidgetClass);
// 5. 创建实例变量并赋值、调用方法
id widge = [[WidgetClass alloc] init];
[widge setValue:@(15) forKey:[NSString stringWithUTF8String:"height"]];
NSLog(@"Widge instance height = %@", [widge valueForKey:[NSString stringWithUTF8String:"height"]]);
objc_msgSend(widge, NSSelectorFromString(@"display"));
// 6. 动态方式添加一个属性
objc_setAssociatedObject(widge, @"width", @(10), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
// 7. 获取
id result = objc_getAssociatedObject(widge, @"width");
NSLog(@"Widget instance width = %@", result);
}
return 0;
}
#import <Foundation/Foundation.h>
@interface Student : NSObject <NSCoding>
@property (copy, nonatomic) NSString *name;
@property (assign, nonatomic)int age;
@property (assign, nonatomic)double weight;
@property (copy, nonatomic)NSArray *hobby;
@property (copy, nonatomic)NSDictionary *others;
@end
#import "Student.h"
#define knameKey @"name"
#define kageKey @"age"
#define kweightKey @"weight"
#define khobbyKey @"hobby"
#define kothersKey @"others"
@implementation Student
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:_name forKey:knameKey];
[aCoder encodeInt:_age forKey:kageKey];
[aCoder encodeDouble:_weight forKey:kweightKey];
[aCoder encodeObject:_hobby forKey:khobbyKey];
[aCoder encodeObject:_others forKey:kothersKey];
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
_name = [aDecoder decodeObjectForKey:knameKey];
_age = [aDecoder decodeIntForKey:kageKey];
_weight = [aDecoder decodeDoubleForKey:kweightKey];
_hobby = [aDecoder decodeObjectForKey:khobbyKey];
_others = [aDecoder decodeObjectForKey:kothersKey];
}
return self;
}
@end
int main(int argc, const char * argv[]) {
@autoreleasepool {
Student *student = [[Student alloc] init];
student.name = @"小红";
student.age = 25;
student.weight = 100.5;
student.hobby = @[@"吃", @"喝", @"玩", @"乐"];
student.others = @{@"phone": @"1234567890", @"wechat": @"123456"};
NSString *path = @"/Users/macmini/Documents/Test/Student.plist";
[NSKeyedArchiver archiveRootObject:student toFile:path];
Student *xiaoming = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"xiaoming:%@", xiaoming);
}
return 0;
} #import "Student.h"
#import <objc/runtime.h>
@implementation Student
// 获取所有成员变量进行循环编码
- (void)encodeWithCoder:(NSCoder *)aCoder {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList([self class], &outCount);
for (int i = 0; i < outCount; i++) {
NSString *key = [NSString stringWithUTF8String:ivar_getName(ivars[i])];
id value = [self valueForKey:key];
[aCoder encodeObject:value forKey:key];
}
free(ivars);
}
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList([self class], &outCount);
for (int i = 0; i < outCount; i++) {
NSString *key = [NSString stringWithUTF8String:ivar_getName(ivars[i])];
id value = [self valueForKey:key];
[self setValue:value forKey:key];
}
free(ivars);
}
return self;
}
@end普通写法每个类都要写一次，使用runtime虽然每个类都要写一次，但是代码都是完全一样的，可以直接粘贴复制，//该实现也实现了对父类属性进行归档解档的实现
#import "NSObject+Archive.h"
#import <objc/runtime.h>
@implementation NSObject (Archive)
// 先对当前类进行编码，然后对父类进行编码，如果父类是NSObject就结束编码
- (void)encode:(NSCoder *)aCoder {
Class clazz = self.class;
while (clazz && clazz != [NSObject class]) {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList(clazz, &outCount);
for (int i = 0; i < outCount; i++) {
NSString *key = [NSString stringWithUTF8String:ivar_getName(ivars[i])];
id value = [self valueForKey:key];
[aCoder encodeObject:value forKey:key];
}
free(ivars);
clazz = [clazz superclass];
}
}
- (void)decode:(NSCoder *)aDecoder {
Class clazz = self.class;
while (clazz && clazz != [NSObject class]) {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList(clazz, &outCount);
for (int i = 0; i < outCount; i++) {
NSString *key = [NSString stringWithUTF8String:ivar_getName(ivars[i])];
id value = [aDecoder decodeObjectForKey:key];
[self setValue:value forKey:key];
}
free(ivars);
clazz = [clazz superclass];
}
}
@end#import <Foundation/Foundation.h>
#import "Person.h"
// 继承Person类
@interface Student : Person <NSCoding>
@property (copy, nonatomic) NSString *name;
@property (assign, nonatomic)double weight;
@property (copy, nonatomic)NSArray *hobby;
@property (copy, nonatomic)NSDictionary *others;
@end
#import "Student.h"
#import "NSObject+Archive.h"
#import <objc/runtime.h>
@implementation Student
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
[self decode:aDecoder];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
[self encode:aCoder];
}
@end
int main(int argc, const char * argv[]) {
@autoreleasepool {
Student *student = [[Student alloc] init];
student.name = @"小红";
student.age = 25;
student.weight = 100.5;
student.hobby = @[@"吃", @"喝", @"玩", @"乐"];
student.others = @{@"phone": @"1234567890", @"wechat": @"123456"};
student.address = @"父类属性address";
student.hight = 180.5;
student.gender = YES;
NSString *path = @"/Users/macmini/Documents/Test/Student.plist";
[NSKeyedArchiver archiveRootObject:student toFile:path];
Student *xiaoming = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"xiaoming:%@", xiaoming);
}
return 0;
} #ifndef Coding_h
#define Coding_h
#import "NSObject+Archive.h"
#define CodingImplemention - (instancetype)initWithCoder:(NSCoder *)aDecoder {if (self = [super init]) { [self decode:aDecoder];} return self;}- (void)encodeWithCoder:(NSCoder *)aCoder { [self encode:aCoder];}
#endif /* Coding_h */#import "Student.h" #import "Coding.h" @implementation Student CodingImplemention @end在Student.m 文件中只需一个单词即可实现归档解档，可以看到已经达到至简了
@interface School : NSObject @property (copy, nonatomic)NSString * ID; @property (copy, nonatomic)NSString * name; @end #import "School.h" @implementation School @end
#import <Foundation/Foundation.h> @interface Address : NSObject @property (copy, nonatomic)NSString * ID; @property (copy, nonatomic)NSString * address; @end #import "Address.h" @implementation Address @end
#import <Foundation/Foundation.h>
#import "School.h"
@interface User : NSObject
@property (copy, nonatomic)NSString * ID;
@property (copy, nonatomic)NSString * name;
@property (assign, nonatomic)int age;
@property (strong, nonatomic)School *school;
@property (copy, nonatomic)NSArray *address;
@end
#import "User.h"
@implementation User
- (NSDictionary *)eleTypeForArray {
return @{@"address": @"Address"};
}
@end#import <Foundation/Foundation.h>
@interface NSObject (Dict2Model)
- (void)setDict:(NSDictionary *)dict;
+ (instancetype)initWithDict:(NSDictionary *)dict;
- (NSDictionary *)eleTypeForArray;
@end
#import "NSObject+Dict2Model.h"
#import <objc/runtime.h>
@implementation NSObject (Dict2Model)
- (void)setDict:(NSDictionary *)dict {
Class clazz = self.class;
while (clazz && clazz != [NSObject class]) {
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList(clazz, &outCount);
for (int i = 0; i < outCount; i++) {
Ivar ivar = ivars[i];
NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
key = [key substringFromIndex:1]; // 去掉实例变量中的下划线
id value = dict[key];
NSLog(@"%d: key:%@ value:%@", i, key, value);
// 1. 如果类的实例变量多于字典中key
if (value == nil) {
continue;
}
// 2. 实例变量类型以@开头并且前缀不是NS开头的（排除系统类） "@Student"
NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(ivar)];
NSRange range = [type rangeOfString:@"@"];
if (range.location != NSNotFound) {
type = [type substringWithRange:NSMakeRange(2, type.length - 3)];
if (![type hasPrefix:@"NS"]) {
Class class = NSClassFromString(type);
value = [class initWithDict:value];
} else if ([type isEqualToString:@"NSArray"]) {
NSArray *array = (NSArray *)value;
NSMutableArray *mArray = [NSMutableArray array];
id class;
if ([self respondsToSelector:@selector(eleTypeForArray)]) {
NSString *eleTypeStr = [[self eleTypeForArray] objectForKey:key];
class = NSClassFromString(eleTypeStr);
} else {
NSLog(@"数组类型不明确!");
return;
}
for (int i = 0; i < array.count; i++) {
id obj = [class initWithDict:value[i]];
[mArray addObject:obj];
}
value = mArray;
}
}
[self setValue:value forKeyPath:key];
}
free(ivars);
clazz = [clazz superclass];
}
}
+ (instancetype)initWithDict:(NSDictionary *)dict {
NSObject *obj = [[self alloc] init];
[obj setDict:dict];
return obj;
}
@endStudent.json
{
"name" : "Tom",
"age" : 20,
"weight" : "181",
"school":{
"ID":1,
"name":"北京大学"
},
"address" : [
{
"ID":1,
"address":"上海市"
},
{
"ID":2,
"address":"北京市"
}
]
}int main(int argc, const char * argv[]) {
@autoreleasepool {
NSData *jsonData = [NSData dataWithContentsOfFile:@"/Users/macmini/Documents/Test/RuntimeWidget/RuntimeWidget/Student.json"];
NSDictionary *userDict = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:NULL];
User *user = (User *)[User initWithDict:userDict];
School *school = user.school;
Address *address = user.address[0];
NSLog(@"User: %@, %d, %@, %@", user.name, user.age, school.name, address.address);
}
return 0;
}
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原文地址：http://blog.csdn.net/vbirdbest/article/details/51980161
