iOS-model转化为字典

雨点打透心脏的1/2处 2023-10-17 21:20 46阅读 0赞

## 将model转化为字典 ##

> 刚入行时就见过项目里有mode转化为字典的代码，后来用过MJExtension的第三方库，非常好用，其实原理就是利用runtime遍历所有属性值，然后进行转化。但是自己从来没有动手写过~~~今天亲自写一写

##### 1.先用runtime遍历所有属性值 #####

代码如下：

- (NSDictionary *)dicFromObject:(NSObject *)object {
        NSMutableDictionary *dic = [NSMutableDictionary dictionary];
        unsigned int count;
        objc_property_t *propertyList = class_copyPropertyList([object class], &count);
    
        for (int i = 0; i < count; i++) {
            objc_property_t property = propertyList[i];
            const char *cName = property_getName(property);
            NSString *name = [NSString stringWithUTF8String:cName];
            NSObject *value = [object valueForKey:name];//valueForKey返回的数字和字符串都是对象
    
            if (value == nil) {
                //null
                //[dic setObject:[NSNull null] forKey:name];//这行可以注释掉?????
    
            } else {
                //model
                [dic setObject:[self dicFromObject:value] forKey:name];
            }
        }
    
        return [dic copy];
    }

> 这时我发现上面的代码只能转化`简单的model`, 而value的可能情况很多，可能是`数组`，可能是`字典`，一会又发现数组或字典里可能`嵌套数组或字典或model`,我的妈妈，单纯一个递归方法根本无法实现所有的情况，还需要再添加方法。这么太复杂吗？我记得别人写时很简单呀。于是我百度了一下，几乎所有代码都是上述类似代码，我也是醉了。。这根本`无法适用在实际的项目`里。

##### 2.代码改进如下： #####

//model转化为字典
    - (NSDictionary *)dicFromObject:(NSObject *)object {
        NSMutableDictionary *dic = [NSMutableDictionary dictionary];
        unsigned int count;
        objc_property_t *propertyList = class_copyPropertyList([object class], &count);
    
        for (int i = 0; i < count; i++) {
            objc_property_t property = propertyList[i];
            const char *cName = property_getName(property);
            NSString *name = [NSString stringWithUTF8String:cName];
            NSObject *value = [object valueForKey:name];//valueForKey返回的数字和字符串都是对象
    
            if ([value isKindOfClass:[NSString class]] || [value isKindOfClass:[NSNumber class]]) {
                //string , bool, int ,NSinteger
                [dic setObject:value forKey:name];
    
            } else if ([value isKindOfClass:[NSArray class]] || [value isKindOfClass:[NSDictionary class]]) {
                //字典或字典
                [dic setObject:[self arrayOrDicWithObject:(NSArray*)value] forKey:name];
    
            } else if (value == nil) {
                //null
                //[dic setObject:[NSNull null] forKey:name];//这行可以注释掉?????
    
            } else {
                //model
                [dic setObject:[self dicFromObject:value] forKey:name];
            }
        }
    
        return [dic copy];
    }

*  `需要单独处理字典或数组`

代码如下：

//将可能存在model数组转化为普通数组
    - (id)arrayOrDicWithObject:(id)origin {
        if ([origin isKindOfClass:[NSArray class]]) {
            //数组
            NSMutableArray *array = [NSMutableArray array];
            for (NSObject *object in origin) {
                if ([object isKindOfClass:[NSString class]] || [object isKindOfClass:[NSNumber class]]) {
                    //string , bool, int ,NSinteger
                    [array addObject:object];
    
                } else if ([object isKindOfClass:[NSArray class]] || [object isKindOfClass:[NSDictionary class]]) {
                    //数组或字典
                    [array addObject:[self arrayOrDicWithObject:(NSArray *)object]];
    
                } else {
                    //model
                    [array addObject:[self dicFromObject:object]];
                }
            }
    
            return [array copy];
    
        } else if ([origin isKindOfClass:[NSDictionary class]]) {
            //字典
            NSDictionary *originDic = (NSDictionary *)origin;
            NSMutableDictionary *dic = [NSMutableDictionary dictionary];
            for (NSString *key in originDic.allKeys) {
                id object = [originDic objectForKey:key];
    
                if ([object isKindOfClass:[NSString class]] || [object isKindOfClass:[NSNumber class]]) {
                    //string , bool, int ,NSinteger
                    [dic setObject:object forKey:key];
    
                } else if ([object isKindOfClass:[NSArray class]] || [object isKindOfClass:[NSDictionary class]]) {
                    //数组或字典
                    [dic setObject:[self arrayOrDicWithObject:object] forKey:key];
    
                } else {
                    //model
                    [dic setObject:[self dicFromObject:object] forKey:key];
                }
            }
    
            return [dic copy];
        }
    
        return [NSNull null];
    }

*  代码编码完毕，我写了两个类`Foo,Moo`做测试：

Foo.h如下：

@interface Foo : NSObject
    
    @property(nonatomic, assign) int pwd;
    @property(nonatomic, strong) NSString *userName;
    @property(nonatomic, assign) BOOL isUrl;
    @property(nonatomic, strong) Moo *moo;
    @property(nonatomic, strong) NSArray *emailList;
    @property(nonatomic, strong) NSArray *manyMoo;
    @property(nonatomic, strong) NSDictionary *childrenList;
    @property(nonatomic, strong) NSDictionary *MooDic;
    
    @end

Moo.h如下：

@interface Moo : NSObject
    
    @property(nonatomic, strong) NSString *name;
    @property(nonatomic, strong) NSString *pwd;
    @property(nonatomic, strong) NSString *profile;
    
    @end

*  测试代码如下：

Foo *foo = [[Foo alloc] init];
        foo.userName = @"gaoyuqiang";
        foo.userName = nil;
        foo.pwd = 1234;
        foo.isUrl = YES;
        foo.emailList = @[@"sfa@234.com", @"2@34.com"];
    
        Moo *moo = [[Moo alloc] init];
        moo.name = @"moo";
        moo.pwd = @"234";
        moo.profile = @"mooooo";
    
        foo.moo = moo;
    
        Moo *moo1 = [[Moo alloc] init];
        moo1.name = @"moo1";
        moo1.pwd = @"234";
        moo1.profile = @"mooooo";
    
        Moo *moo2 = [[Moo alloc] init];
        moo2.name = @"moo2";
        moo2.pwd = @"234";
        moo2.profile = @"mooooo";
    
        foo.manyMoo = @[moo1, moo2];
        foo.childrenList = @{@"name":@"gao", @"pwd":@"32424"};
        foo.MooDic = @{@"1" : @{@"s1" : moo1, @"s2" : moo2, @"s3" : @[@"1", @"2"]}, @"2" : moo2};
    
        NSDictionary *result = [self dicFromObject:foo];
        NSLog(@"result=%@", result);

Log如下,无论如何嵌套都可以完全转化

2017-07-26 16:57:10.030 Testff[61302:2256815] result={
        MooDic =     {
            1 =         {
                s1 =             {
                    name = moo1;
                    profile = mooooo;
                    pwd = 234;
                };
                s2 =             {
                    name = moo2;
                    profile = mooooo;
                    pwd = 234;
                };
                s3 =             (
                    1,
                    2
                );
            };
            2 =         {
                name = moo2;
                profile = mooooo;
                pwd = 234;
            };
        };
        childrenList =     {
            name = gao;
            pwd = 32424;
        };
        emailList =     (
            "sfa@234.com",
            "2@34.com"
        );
        isUrl = 1;
        manyMoo =     (
                    {
                name = moo1;
                profile = mooooo;
                pwd = 234;
            },
                    {
                name = moo2;
                profile = mooooo;
                pwd = 234;
            }
        );
        moo =     {
            name = moo;
            profile = mooooo;
            pwd = 234;
        };
        pwd = 1234;
    }

> 有时间再写一个字典转model的代码，思路应该跟这个是类似的。