setValuesForKeysWithDictionary 使用方法

定义NSObject文件，setValuesForKeysWithDictionary 为自动将Dic赋值给模型文件，如果模型文件中没有对应的key值，就会崩溃，解决方法为下面，重写

- (void)setValue:(nullable id)value forUndefinedKey:(NSString *)key

- 方法

即可拦截崩溃

%s （代表打印字符串 类似%c）func

import “student.h”

@implementation student

- (instancetype)initWithDic:(NSDictionary *)dict{

if (self = [super init]) {

[self setValuesForKeysWithDictionary:dict];

}

return self;

}

(instancetype) stuWithDict:(NSDictionary *)dict

{

return [[self alloc] initWithDic:dict];

}

(void)setValue:(id)value forUndefinedKey:(nonnull NSString *)key

{

NSLog(@”拦截崩溃**%s”,func);

}

@end

.m文件实现方式为：

import “student.h”

@implementation student

- (instancetype)initWithDic:(NSDictionary *)dict{

if (self = [super init]) {

[self setValuesForKeysWithDictionary:dict];

}

return self;

}

(instancetype) stuWithDict:(NSDictionary *)dict

{

return [[self alloc] initWithDic:dict];

}

(void)setValue:(id)value forUndefinedKey:(nonnull NSString *)key

{

NSLog(@”拦截崩溃**%s”,func);

}

@end

调用方式为：

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@”Tom”,@”name”,@”110”,@”num”,@”170.0”,@”height”, nil];

student * stu = [[student alloc] initWithDic:dict];

NSLog(@”name = %@ num = %@”, stu.name, stu.num);

KVODEMO:

People.m

1 #import “People.h”

2 #import “Dog.h”

3

4 @implementation People

5

6 /**

7 * 初始化时增加对dog的监听

8 *

9 */

10 - (void)setDog:(Dog *)dog

11 {

12 _dog = dog;

13 [self.dog addObserver:self forKeyPath:@”name” options:NSKeyValueObservingOptionNew context:nil];

14 }

15 /**

16 * 重写observeValueForKeyPath方法

17 */

18 - (void)observeValueForKeyPath:(NSString )keyPath ofObject:(id)object change:(NSDictionary