BaseModel，用于 JSON 转 Objective-C Model

XMBaseModel.h

#import <Foundation/Foundation.h>
#import "XMImageURL.h"

enum {
    // 保密
    XMGenderUnknow = 0,
    // 男
    XMGenderMale = 1,
    // 女
    XMGenderFemale = 2,
};
// 用户性别
typedef int XMGender;

enum {
    XMRankInfoTypeSong = 1,
    XMRankInfoTypeAlbum,
    XMRankInfoTypeArtist,
};
// Rank.getInfo 查询参数类型
typedef int XMRankInfoType;

@interface XMBaseModel : NSObject <NSCoding>

+ (NSDictionary *) keysMapping;

+ (id)modelWithResponseDict:(NSDictionary *)dict;

// 将 API 返回的 str 的性别转换成 XMGender
+ (XMGender) xmGenderWithResponseString: (NSString *) str;

@end

XMBaseModel.m

#import "XMBaseModel.h"
#import "NSURL+XMAddition.h"
#import <objc/runtime.h>

@implementation XMBaseModel

+ (XMGender) xmGenderWithResponseString: (NSString *) str {
    XMGender gender = XMGenderUnknow;
    gender = XMGenderUnknow;
    if ([str isEqualToString:@"M"]) {
        gender = XMGenderMale;
    }
    else if ([str isEqualToString:@"F"]) {
        gender = XMGenderFemale;
    }
    return gender;
}

// 自动将 JSON 里面的值根据 keyMappings 的定义填充到对应的属性里面，并生成一个对象
// 此方法将不会处理 NSArray 的内容
+ (id)modelWithResponseDict:(NSDictionary *)dict {
    id obj = [self new];
    for (NSString *originKey in [[self keysMapping] allKeys]) {
        // OC 的 key
        NSString *key = [[self keysMapping] objectForKey:originKey];
        // JSON 的值
        if ([[[dict allKeys] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF == %@",originKey]] count] == 0) {
            // 跳过结果里面没有的 key
            continue;
        }
        
        id originVal = dict[originKey];
        // 得到 OC 那个 Key 的类型
        
        if ([originVal isKindOfClass:[NSString class]]) {
            // NSString
            if ([obj propertyIsNSUInteger:key]) {
                // NSUInteger & int
                [obj setValue:[NSNumber numberWithUnsignedInteger:(NSUInteger) [originVal integerValue]] forKey:key];
            }
            else if ([obj propertyIsBoolean:key]) {
                // BOOL
                if ([originVal isEqualToString:@"1"] || [originVal isEqualToString:@"yes"] || [originVal isEqualToString:@"true"]) {
                    [obj setValue:[NSNumber numberWithBool:true] forKey:key];
                }
                else {
                    [obj setValue:[NSNumber numberWithBool:false] forKey:key];
                }
            }
            else if ([obj propertyIsNSURL:key]) {
                // NSURL
                [obj setValue:[NSURL URLWithEscapedString:originVal] forKey:key];
            }
            else if ([obj propertyIsXMImageURL:key]) {
                XMImageURLType imageUrlType = XMImageURLTypeAlbum;
                if ([[obj className] isEqualToString:@"XMAlbum"]) {
                    imageUrlType = XMImageURLTypeAlbum;
                }
                else if ([[obj className] isEqualToString:@"XMSong"]) {
                    imageUrlType = XMImageURLTypeSong;
                }
                else if ([[obj className] isEqualToString:@"XMUser"]) {
                    imageUrlType = XMImageURLTypeUser;
                }
                else if ([[obj className] isEqualToString:@"XMCollect"]) {
                    imageUrlType = XMImageURLTypeCollect;
                }
                else if ([[obj className] isEqualToString:@"XMRadio"]) {
                    imageUrlType = XMImageURLTypeRadio;
                }
                else if ([[obj className] isEqualToString:@"XMArtist"]) {
                    imageUrlType = XMImageURLTypeArtist;
                }

                [obj setValue:[XMImageURL urlWithType:imageUrlType url:originVal] forKey:key];
            
            }
            else {
                // NSString
                [obj setValue:originVal forKey:key];
            }        
        }
        else if ([originVal isKindOfClass:[NSNumber class]]) {
            if ([obj propertyIsDate:key]) {
                [obj setValue:[NSDate dateWithTimeIntervalSince1970:[originVal integerValue]] forKey:key];
            }
            else {
                [obj setValue:originVal forKey:key];
            }
            
        }
        
    }
    return obj;
}


- (BOOL) propertyIsNSString: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"@\"NSString\""]);
}

- (BOOL) propertyIsDate: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"@\"NSDate\""]);
}

- (BOOL) propertyIsNSUInteger: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"Q"]);
}

- (BOOL) propertyIsBoolean: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"c"]);
}

- (BOOL) propertyIsNSURL: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"@\"NSURL\""]);
}

- (BOOL) propertyIsXMImageURL: (NSString *) property {
    return ([[self.class typeForProperty:property] isEqualToString:@"@\"XMImageURL\""]);
}

+ (NSString *) typeForProperty:(NSString *)prop {
    NSString *result = nil;
  objc_property_t property = class_getProperty(self, [prop UTF8String]);
	if (!property)
		return nil;
    
	// This will return some garbage like "Ti,GgetFoo,SsetFoo:,Vproperty"
	// See https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html
    
	NSString *atts = [NSString stringWithCString:property_getAttributes(property) encoding:NSUTF8StringEncoding];
    
	for (NSString *att in [atts componentsSeparatedByString:@","]) {
        if ([att hasPrefix:@"T"]) {
            result = [att substringFromIndex:1];
//            NSLog(@"---- %@ || %@", atts, result);
            return result;
        }
			
    }
    
	return nil;
}

+ (NSDictionary *)keysMapping {
    return @{};
}




#pragma mark - NSCoding
- (id)initWithCoder:(NSCoder *)aDecoder {
    NSArray *keys = [[self.class keysMapping] allValues];
    
    if ([aDecoder allowsKeyedCoding]) {
        for (NSString *key in keys) {
            [self setValue:[aDecoder decodeObjectForKey:key] forKey:key];
        }
    } else {
        for (NSString *key in keys) {
            [self setValue:[aDecoder decodeObject] forKey:key];
        }
    }
    
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    NSArray *keys = [[self.class keysMapping] allValues];
    
    if ([aCoder allowsKeyedCoding]) {
        for (NSString *key in keys) {
            [aCoder encodeObject:[self valueForKey:key] forKey:key];
        }
    } else {
        for (NSString *key in keys) {
            [aCoder encodeObject:[self valueForKey:key]];
        }
    }
}



@end