.main.m文件

    定义Student类
    1、属性有age,name,gender; 2、age使⽤用assign,name使⽤用retain,gender使⽤用copy; 3、重写age、name、gender的setter和getter⽅方法。
    */

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    Student *stu = [[Student alloc] init];
    
    // KVC 间接访问的一种方式
    [stu setValue:@"longlong" forKey:@"name"];
    NSLog(@"%@", [stu valueForKey:@"name"]);
    
    NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"long", @"name", @"m", @"gender", @"23", @"age", @"200", @"id", nil];
    // 重要方法   就字典中的内容按照key值 对应的写入对象中
    [stu setValuesForKeysWithDictionary:dic];
    NSLog(@"%@ %@",stu.name, stu.gender);

Student.h文件

@interface Student : NSObject
@property (nonatomic, retain) NSString *name;
@property (nonatomic, assign) NSInteger age;
@property (nonatomic, copy) NSString *gender;
@property (nonatomic, copy) NSString *idstr;

(instancetype)initWithName:(NSString *)name

                     age:(NSInteger)age
                  gender:(NSString *)gender;

(instancetype)StudentWithName:(NSString *)name

                        age:(NSInteger)age
                     gender:(NSString *)gender;

Student.m文件

@synthesize age = _age;
@synthesize name = _name;
@synthesize gender = _gender;

(void)dealloc
{
[_name release];
[_gender release];
[super dealloc];
}
(void)setName:(NSString *)name {
if (_name != name) {
```
[_name release];
_name = [name retain];
```
}
}
(NSString *)name {
return [[_name retain] autorelease];
}
(void)setGender:(NSString *)gender {
if (_gender != gender) {
```
[_gender release];
_gender = [gender copy];
```
}
}
(NSString *)gender {
return [[_gender retain] autorelease];
}
(void)setAge:(NSInteger)age {
_age = age;
}
(NSInteger)age {
return _age;
}
(instancetype)initWithName:(NSString )name age:(NSInteger)age gender:(NSString )gender
{
self = [super init];
if (self) {
```
self.name = name;
self.gender = gender;
self.age = age;
```
}
return self;
}
(instancetype)StudentWithName:(NSString )name age:(NSInteger)age gender:(NSString )gender
{
Student *p = [[Student alloc] initWithName:name age:age gender:gender];
return [p autorelease];
}

(void)setValue:(id)value forKey:(NSString *)key
{
[super setValue:value forKey:key];
if ([key isEqualToString:@"age"]) {
```
// 其他类型转NSInteger类型
self.age = [value integerValue];
```
}
}

// 重定义setValue // KVC 时不崩溃

(void)setValue:(id)value forUndefinedKey:(NSString *)key
{
```
// 如上面
```
}

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OC-KVC--就字典中的内容按照key值 对应的写入对象中

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OC-KVC--就字典中的内容按照key值对应的写入对象中