用runtime遍历用户属性的方法与传统方法的比较

初始化方法

#import "User.h"
#import <objc/message.h>

@implementation User

- (id) initWithDicionary:(NSDictionary*)dic {
    self = [super init];
    if (self) {
        //更新用户信息:
        [self updateUserInfo:dic];
    }
    return self;
}

更新用户信息

- (void)updateUserInfo:(NSDictionary *)dic {
    id userId =  [[dic objectForKey:@"data"] objectForKey:@"user_id"];
    if ([userId isKindOfClass:[NSNull class]]) self.user_id = @"0000";
    self.user_id = userId;
    
    NSString *nickName = [[dic objectForKey:@"data"] objectForKey:@"nickname"];
    if ([nickName isKindOfClass:[NSNull class]]) self.nickname = @"";
    self.nickname = nickName;
    
    id mobile = [[dic objectForKey:@"data"] objectForKey:@"mobile"];
    if ([mobile isKindOfClass:[NSNull class]]) self.moblie = @"0000";
    self.moblie = mobile;
    
    id lng = [[dic objectForKey:@"data"] objectForKey:@"lng"];
    if ([lng isKindOfClass:[NSNull class]]) self.lng = @"00.00";
    self.lng = lng;
    
    id lat = [[dic objectForKey:@"data"] objectForKey:@"lat"];
    if ([lat isKindOfClass:[NSNull class]]) self.lat = @"00.00";
    self.lat = lat;
    
    NSString *avater = [[dic objectForKey:@"data"] objectForKey:@"avatar"];
    if ([avater isKindOfClass:[NSNull class]]) self.avatar = @"";
    self.avatar = avater;
    
    NSString *token = [dic objectForKey:@"token"];
    if ([token isKindOfClass:[NSNull class]]) self.token = @"";
    self.token = token;
    
    NSString *describe = [[dic objectForKey:@"data"] objectForKey:@"describe"];
    if ([describe isKindOfClass:[NSNull class]]) self.describe = @"";
    self.describe = describe;
    
    NSString *signature = [[dic objectForKey:@"data"] objectForKey:@"signature"];
    if ([signature isKindOfClass:[NSNull class]]) self.signature = @"";
    self.signature = signature;
    
    NSString *gender = [[dic objectForKey:@"data"] objectForKey:@"gender"];
    if ([gender isKindOfClass:[NSNull class]])  self.gender = @"";
    self.gender = gender;
    
    NSString *school = [[dic objectForKey:@"data"] objectForKey:@"school"];
    if ([school isKindOfClass:[NSNull class]]) self.school = @"";
    self.school = school;
    
    NSString *department = [[dic objectForKey:@"data"] objectForKey:@"department"];
    if ([department isKindOfClass:[NSNull class]]) self.department = @"";
    self.department = department;
    
    NSString *start_time = [[dic objectForKey:@"data"] objectForKey:@"start_time"];
    if ([start_time isKindOfClass:[NSNull class]]) self.start_time = @"";
    self.start_time = start_time;
    
    NSString *education_id = [[dic objectForKey:@"data"] objectForKey:@"education_id"];
    if ([education_id isKindOfClass:[NSNull class]])  self.education_id = @"";
    self.education_id = education_id;
}

runtime遍历属性

/*
 对象归档解档改为运行时进行:
 
 */
#pragma mark - 对象归档
- (void)encodeWithCoder:(NSCoder *)aCoder {
    unsigned int count = 0 ;
    Ivar *ivars = class_copyIvarList([User class], &count) ;
    for (int i = 0; i < count; i++) {
        Ivar ivar = ivars[i] ;
        const char *propertyName = ivar_getName(ivar) ;
        NSString *key = [[NSString alloc] initWithUTF8String:propertyName] ;
        [aCoder encodeObject:[self valueForKey:key] forKey:key] ;
    }
}

#pragma mark - 对象解档
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super init] ;
    if (self) {
        unsigned int count = 0 ;
        Ivar *ivars = class_copyIvarList([User class], &count) ;
        for (int i = 0; i < count; i++) {
            Ivar ivar = ivars[i] ;
            const char *propertyName = ivar_getName(ivar) ;
            NSString *key = [[NSString alloc] initWithUTF8String:propertyName] ;
            id value = [aDecoder decodeObjectForKey:key] ;
            [self setValue:value forKey:key] ;
        }
    }
    return self ;
}

原始方法一个一个去写

// 归档(NSCoding 协议方法):
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:self.user_id forKey:@"user_id"];
    [aCoder encodeObject:self.nickname forKey:@"nickname"];
    [aCoder encodeObject:self.moblie forKey:@"moblie"];
    [aCoder encodeObject:self.lng forKey:@"lng"];
    [aCoder encodeObject:self.lat forKey:@"lat"];
    [aCoder encodeObject:self.token forKey:@"token"];
    [aCoder encodeObject:self.avatar forKey:@"avatar"];
    [aCoder encodeObject:self.describe forKey:@"describe"];
    [aCoder encodeObject:self.signature forKey:@"signature"];
    [aCoder encodeObject:self.gender forKey:@"gender"];
    [aCoder encodeObject:self.school forKey:@"school"];
    [aCoder encodeObject:self.department forKey:@"department"];
    [aCoder encodeObject:self.start_time forKey:@"start_time"];
    [aCoder encodeObject:self.education_id forKey:@"education_id"];
}


// 反归档(NSCoding 协议方法):
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        self.user_id = [aDecoder decodeObjectForKey:@"user_id"];
        self.nickname = [aDecoder decodeObjectForKey:@"nickname"];
        self.moblie = [aDecoder decodeObjectForKey:@"moblie"];
        self.lng = [aDecoder decodeObjectForKey:@"lng"];
        self.lat = [aDecoder decodeObjectForKey:@"lat"];
        self.token = [aDecoder decodeObjectForKey:@"token"];
        self.avatar = [aDecoder decodeObjectForKey:@"avatar"];
        self.describe = [aDecoder decodeObjectForKey:@"describe"];
        self.signature = [aDecoder decodeObjectForKey:@"signature"];
        self.gender = [aDecoder decodeObjectForKey:@"gender"];
        self.school = [aDecoder decodeObjectForKey:@"school"];
        self.department = [aDecoder decodeObjectForKey:@"department"];
        self.start_time = [aDecoder decodeObjectForKey:@"start_time"];
        self.education_id = [aDecoder decodeObjectForKey:@"education_id"];

    }
    return self;
}

重写description方法打印

- (NSString *)description {
    return [NSString stringWithFormat:@"%@, %@, %@, %@, %@, %@, %@", _user_id, _nickname, _avatar, _moblie, _token, _lat, _lng];
}

@end

愿编程让这个世界更美好