KVC 如何给非对象属性赋值

kvc给对象属性赋值大家肯定已经很熟悉了，但是怎么给非对象属性赋值呢，现在举例给以结构体为属性并赋值为例：

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN
typedef struct {
    float x,y,z;
}Floats;
@interface TestObject : NSObject
@property(nonatomic)Floats testFloat;
@end

NS_ASSUME_NONNULL_END

TestObject *testObject = [[TestObject alloc]init];
    //赋值
    Floats testFolat = {1.0,2.0,3.0};
    NSValue *value = [NSValue valueWithBytes:&testFolat objCType:@encode(Floats)];
    [testObject setValue:value forKey:@"testFloat"];

    //取值
    NSValue *value1 = [testObject valueForKey:@"testFloat"];
    Floats floats;
    [value1 getValue:&floats];
    NSLog(@"%lf-%lf-%lf",floats.x,floats.y,floats.z);

打印结果：1.000000-2.000000-3.000000