RunTime 获取对象属性和方法

快来打我* 2022-08-09 17:58 251阅读 0赞

RunTime中的效果感觉和Java中的反射差不多，在动态也就是在代码运行的时候来获取这个对象的属性和方法。 在对数据库的写法上面可以用到，如：需要写SQL语句和对象的对应的时候， 可以用这种形式来进行封装，这样的话， 通过一个类能处理好项目中的SQL的创建或者查询等操作。 一些高层的封装上面也需要用到。 简单的获取属性和方法的如下代码：

#import <Foundation/Foundation.h>
    
    @interface Student : NSObject
    
    
    @property(nonatomic,assign)NSString *userName;
    @property(nonatomic,assign)NSString *sex;
    @property(nonatomic)NSInteger  age;
    
    
    - (void)happy:(NSString *)happyName;
    
    
    - (void)readBook;
    
    
    
    @end

#import "Student.h"
    
    
    @implementation Student
    
    
    - (void)happy:(NSString *)happyName{
    
        NSLog(@"爱好打-->%@",happyName);
    }
    
    - (void)readBook{
        NSLog(@"文学小说");
    }

获取类如下：

#import <Foundation/Foundation.h>
    
    @interface EntityTools : NSObject
    
    - (void)gainParmers:(NSString *)className;
    
    @end

#import "EntityTools.h"
    #import <objc/runtime.h>
    
    @implementation EntityTools
    
    #pragma mark 获取 属性， 方法， 相当于java中的反射
    - (void)gainParmers:(NSString *)className{
        Class  classEntity = NSClassFromString(className);
        NSObject *stu =  [[classEntity alloc] init];
        
        unsigned int count;
        // 获取属性列表
        objc_property_t *propertyList = class_copyPropertyList([stu class], &count);
        for (unsigned int i = 0; i<count; i++) {
            const char *propertyName = property_getName(propertyList[i]);
            NSLog(@"property----="">%@", [NSString stringWithUTF8String:propertyName]);
        }
        
        // 获取方法
        Method *methodList = class_copyMethodList([stu class], &count);
        for (unsigned int i = 0; i<count; i++) {
            Method method = methodList[i];
            SEL  sel = method_getName(method);
            NSString *methodName = NSStringFromSelector(sel);
            if ([methodName isEqualToString:@"readBook"]) {
                NSLog(@"method---->%@", methodName);
                [stu performSelector:sel];
            }else if([methodName isEqualToString:@"happy:"]){
                NSLog(@"method---->%@", methodName);
                [stu performSelector:sel withObject:@"篮球"];
            }
        }
    }

调用：

#import <Foundation/Foundation.h>
    #import "EntityTools.h"
    #import "Student.h"
    
    int main(int argc, const char * argv[]) {
        @autoreleasepool {
            
            [[[EntityTools alloc]init] gainParmers:@"Student"];
            
     
            
        }
        return 0;
    }

运行结果如下：

2015-11-03 16:55:17.277 RunTime学习[3555:1330871] property----=>userName
    2015-11-03 16:55:17.278 RunTime学习[3555:1330871] property----=>sex
    2015-11-03 16:55:17.278 RunTime学习[3555:1330871] property----=>age
    2015-11-03 16:55:17.278 RunTime学习[3555:1330871] method---->happy:
    2015-11-03 16:55:17.278 RunTime学习[3555:1330871] 爱好打-->篮球
    2015-11-03 16:55:17.278 RunTime学习[3555:1330871] method---->readBook
    2015-11-03 16:55:17.279 RunTime学习[3555:1330871] 文学小说
    Program ended with exit code: 0