iOS开发 ☞ KVC详解

一、Keys and Key Paths
Key

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

 Student *student = [[Student alloc] init];
    [student setValue:@"magic" forKey:@"name"];

Key Paths

@interface Teacher : NSObject
@property (nonatomic, strong) Student *stu;
@property (nonatomic, copy) NSString *name;
@end

Teacher *teacher = [[Teacher alloc] init];
    teacher.stu = [[Student alloc] init];
    [teacher setValue:@"magic" forKeyPath:@"stu.name"];

二、Collection Operators