RunTime 获取对象属性和方法

来源：互联网发布：数据库物理层编辑：程序博客网时间：2024/06/05 00:13

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----=>userName2015-11-03 16:55:17.278 RunTime学习[3555:1330871] property----=>sex2015-11-03 16:55:17.278 RunTime学习[3555:1330871] property----=>age2015-11-03 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---->readBook2015-11-03 16:55:17.279 RunTime学习[3555:1330871] 文学小说Program ended with exit code: 0

0 0