KVC的几种常用方法

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KVC的使用1：

以Person为例：

@interface Person : NSObject

@property (nonatomic, copy) NSString *name;

@end

属性的方法：

Person *person = [[Person alloc] init];

person.name = @"大锤";

NSLog(@"%@", person.name);

KVC方法：

Person *person = [[Person alloc] init];

[person setValue:@"盖聂" forKey:@"name"];

NSLog(@"%@", [person valueForKey:@"name"]);

KVC的使用2：

还是以Person为例：

@interface Person : NSObject

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *gender;

@end

属性方法：

Person *person = [[Person alloc] init];

person.name = @"大锤";

person.gender = @"男";

NSLog(@"%@", person.name);

KVC方法：

Person *person = [[Person alloc] init];

NSDictionary *dict = @{@"name" : @"哈哈哈", @"gender" : @"man"};

[person setValuesForKeysWithDictionary:dict];

NSLog(@"%@, %@", [person valueForKey:@"name"], [person valueForKey:@"gender"]);

KVC的使用3：

以Person和Teacher为例：

@class Teacher;

@interface Person : NSObject

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *gender;

@property (nonatomic, retain) Teacher *tea;

@end

@interface Teacher : NSObject

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *sex;

@property (nonatomic, assign) NSInteger age;

@end

属性的方法：

Person *p = [[Person alloc] init];

Teacher *t = [[Teacher alloc] init];

p.tea = t;

t.name = @"哈哈哈";

NSLog(@"%@", p.tea.name);

KVC的方法：

Person *person = [[Person alloc] init];

Teacher *t = [[Teacher alloc] init];

[person setValue:t forKey:@"teacher"];

[person setValue:@"卫庄" forKeyPath:@"tea.name"];

NSLog(@"%@", [person valueForKeyPath:@"tea.name"]);

其实如果我们Person类重写init的话：

- (instancetype)init {

    if (self = [super init]) {

        _tea = [[Teacher alloc] init];

    }

    return self;

}

就可以直接像下面这么写了：

Person *person = [[Person alloc] init];

[person setValue:@"卫庄" forKeyPath:@"tea.name"];

NSLog(@"%@", [person valueForKeyPath:@"tea.name"]);

KVC的几种常用方法

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原文地址：http://www.cnblogs.com/zhizunbao/p/5346065.html