通过runtime打印出对象所有属性的值

通过runtime打印出对象所有属性的值

今天给给大家提供的关于NSObject的category，通过runtime打印属性的值，相当有用哦，以后你再也不用每个对象都通过NSLog来逐个打印属性值了。

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)

- (NSDictionary*)propertiesValues;

@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)

- (NSDictionary*)propertiesValues
{
    // 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

// 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 @"" string
            if (valueObj == nil)
            {
                valueObj = @"";
            }
            
            propertiesValuesDic[property] = valueObj;
        }
    }
    
    return propertiesValuesDic;
}

@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)

- (NSDictionary*)propertiesValues
{
    // 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

// 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 @"" string
            if (valueObj == nil)
            {
                valueObj = @"";
            }
            
            propertiesValuesDic[property] = valueObj;
        }
    }
    
    return propertiesValuesDic;
}

@end

使用详情：

测试用Model

//
//  YXModel.h
//  Test
//
//  Created by YouXianMing on 14-9-4.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface YXModel : NSObject

@property (nonatomic, strong) NSString      *name;
@property (nonatomic, strong) NSNumber      *age;
@property (nonatomic, strong) NSString      *sex;
@property (nonatomic, strong) NSDictionary  *info;

@end

//
//  YXModel.m
//  Test
//
//  Created by YouXianMing on 14-9-4.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "YXModel.h"

@implementation YXModel

@end

//
//  AppDelegate.m
//  Test
//
//  Created by YouXianMing on 14-9-4.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "AppDelegate.h"
#import "NSObject+Properties.h"
#import "YXModel.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // 初始化model
    YXModel *model = [YXModel new];
    
    // 赋值
    model.name     = @"YouXianMing";
    model.age      = @26;
    model.sex      = @"male";
    model.info     = @{@"A":@"B", @"C":@"D"};
    
    // 打印出所有属性的值
    NSLog(@"%@", model.propertiesValues);
    
    return YES;
}

@end

打印信息：

2014-09-04 19:39:08.913 Test[1278:60b] {

    age = 26;

    info =     {

        A = B;

        C = D;

    };

    name = YouXianMing;

    sex = male;

}