用字典给Model赋值

用字典给Model赋值

此篇教程讲述通过runtime扩展NSObject，可以直接用字典给Model赋值，这是相当有用的技术呢。

源码：

NSObject+Properties.h 与 NSObject+Properties.m

// // NSObject+Properties.h // // Created by YouXianMing on 14-9-4. // Copyright (c) 2014年 YouXianMing. All rights reserved. //#import <Foundation/Foundation.h>@interface NSObject (Properties)- (void)setDataDictionary:(NSDictionary*)dataDictionary; - (NSDictionary *)dataDictionary;@end

// // NSObject+Properties.m // // Created by YouXianMing on 14-9-4. // Copyright (c) 2014年 YouXianMing. All rights reserved. //#import "NSObject+Properties.h" #import <objc/runtime.h>@implementation NSObject (Properties)#pragma public - 公开方法- (void)setDataDictionary:(NSDictionary*)dataDictionary {[self setAttributes:dataDictionary obj:self]; }- (NSDictionary *)dataDictionary {// 获取属性列表NSArray *properties = [self propertyNames:[self class]];// 根据属性列表获取属性值return [self propertiesAndValuesDictionary:self properties:properties]; }#pragma private - 私有方法// 通过属性名字拼凑setter方法 - (SEL)getSetterSelWithAttibuteName:(NSString*)attributeName {NSString *capital = [[attributeName substringToIndex:1] uppercaseString];NSString *setterSelStr = \[NSString stringWithFormat:@"set%@%@:", capital, [attributeName substringFromIndex:1]];return NSSelectorFromString(setterSelStr); }// 通过字典设置属性值 - (void)setAttributes:(NSDictionary*)dataDic obj:(id)obj {// 获取所有的key值NSEnumerator *keyEnum = [dataDic keyEnumerator];// 字典的key值(与Model的属性值一一对应)id attributeName = nil;while ((attributeName = [keyEnum nextObject])){// 获取拼凑的setter方法SEL sel = [obj getSetterSelWithAttibuteName:attributeName];// 验证setter方法是否能回应if ([obj respondsToSelector:sel]){id value = nil;id tmpValue = dataDic[attributeName];if([tmpValue isKindOfClass:[NSNull class]]){// 如果是NSNull类型，则value值为空value = nil;}else{value = tmpValue;}// 执行setter方法[obj performSelectorOnMainThread:selwithObject:valuewaitUntilDone:[NSThread isMainThread]];}} }// 获取一个类的属性名字列表 - (NSArray*)propertyNames:(Class)class {NSMutableArray *propertyNames = [[NSMutableArray alloc] init];unsigned int propertyCount = 0;objc_property_t *properties = class_copyPropertyList(class, &propertyCount);for (unsigned int i = 0; i < propertyCount; ++i){objc_property_t property = properties[i];const char *name = property_getName(property);[propertyNames addObject:[NSString stringWithUTF8String:name]];}free(properties);return propertyNames; }// 根据属性数组获取该属性的值 - (NSDictionary*)propertiesAndValuesDictionary:(id)obj properties:(NSArray *)properties {NSMutableDictionary *propertiesValuesDic = [NSMutableDictionary dictionary];for (NSString *property in properties){SEL getSel = NSSelectorFromString(property);if ([obj respondsToSelector:getSel]){NSMethodSignature *signature = nil;signature = [obj methodSignatureForSelector:getSel];NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];[invocation setTarget:obj];[invocation setSelector:getSel];NSObject * __unsafe_unretained valueObj = nil;[invocation invoke];[invocation getReturnValue:&valueObj];//assign to @"" stringif (valueObj == nil){valueObj = @"";}propertiesValuesDic[property] = valueObj;}}return propertiesValuesDic; }@end

测试用Model

Model.h 与 Model.m

// // Model.h // Runtime // // Created by YouXianMing on 14-9-5. // Copyright (c) 2014年 YouXianMing. All rights reserved. //#import <Foundation/Foundation.h>@interface Model : NSObject@property (nonatomic, strong) NSString *name; @property (nonatomic, strong) NSNumber *age; @property (nonatomic, strong) NSDictionary *addressInfo; @property (nonatomic, strong) NSArray *events;@end

// // Model.m // Runtime // // Created by YouXianMing on 14-9-5. // Copyright (c) 2014年 YouXianMing. All rights reserved. //#import "Model.h"@implementation Model@end
使用时的情形
// // AppDelegate.m // Runtime // // Created by YouXianMing on 14-9-5. // Copyright (c) 2014年 YouXianMing. All rights reserved. //#import "AppDelegate.h" #import "NSObject+Properties.h" #import "Model.h"@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// 初始化modelModel *model = [Model new];// 通过字典赋值model.dataDictionary = @{@"name" : @"YouXianMing",@"age" : @26,@"addressInfo" : @{@"HuBei": @"WeiHan"},@"events" : @[@"One", @"Two", @"Three"]};// 打印出属性值NSLog(@"%@", model.dataDictionary);return YES; }@end

打印的信息：

2014-09-05 21:03:54.840 Runtime[553:60b] {

    addressInfo =     {

        HuBei = WeiHan;

    };

    age = 26;

    events =     (

        One,

        Two,

        Three

    );

    name = YouXianMing;

}

以下是两段核心代码(符合单一职能)：

 

总结

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