OC- Json 转 Model

@interface NSObject (JsonToModel)
- (void)parseJsonToModel:(NSDictionary *)dictionaryJson
@end

objc_getClass 和 class_copyPropertyList

// 获取对象

NSString *className = NSStringFromClass([self class]);
const char *cClassName = [className UTF8String];
id theClass = objc_getClass(cClassName);

// 获取 properties

unsigned int propertyCount;
objc_property_t *properties = class_copyPropertyList(theClass, &propertyCount);

// Loop in properties

for property in properties {
    // 内部实现
}

Loop内部实现

// 获取 property_getName 和 property_getAttributes

NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
NSString *propertyType = [[NSString alloc] initWithCString:property_getAttributes(property) encoding:NSUTF8StringEncoding];

// 通过propertyName获取Var

Ivar iVar = class_getInstanceVariable([self class], [propertyName UTF8String]);

// 通过propertyName去Json中寻找Value

id jsonValue = [dictionaryJson objectForKey:propertyName];

Switch property_getAttributes

• case NSString

object_setIvar(self, iVar, jsonValue);

• case NSNumber

object_setIvar(self, iVar, jsonValue);

• case NSDictionary

object_setIvar(self, iVar, jsonValue);

• case NSArray

NSArray *arrayVarInfo = [propertyName componentsSeparatedByString:@"__Array__"];
if ([arrayVarInfo count] == 2)
{
    NSString *keyValue = [arrayVarInfo objectAtIndex:0];
    NSString *varClassName = [arrayVarInfo objectAtIndex:1];
    
    jsonValue = [dictionaryJson objectForKey:keyValue];
    
    NSMutableArray *arrayValue = [[NSMutableArray alloc] init];
        
    // 内部递归 parseJsonToModel
    [self parseJsonArray:jsonValue toArray: arrayValue forClassName:varClassName];
    
     object_setIvar(self, iVar, arrayDest);
}

• case customType

NSArray *arrayTypeInfo = [propertyType componentsSeparatedByString:@"\""];
if ([arrayTypeInfo count] > 2)
{
    NSString *varClassName = [arrayTypeInfo objectAtIndex:1];
    // 创建对象
    Class varClass = NSClassFromString(varClassName);
    if (varClass != nil)
    {
        id varObject = [[varClass alloc] init];
         // 递归进行下层解析
        [varObject parseJsonToModel:jsonValue];

        object_setIvar(self, iVar, varObject);
    }
}

Declared Properties