ios中的Runtime

今天对Objective-C中的Runtime了解了下。第一感觉就是跟java中反射很像，原来就是同一性质的东西。Runtime是底层的C语言。可以动态的获取或修改类的方法、属性，动态创建类、类的属性、类的方法等。其实Objective-C在许多实现方面还是在很依赖C的。C还是有毕要再回顾下了。下面就是Runtime获取属性和方法相关代码（需导入#import <objc/runtime.h>）：

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface RuntimeVo : NSObject

@property(nonatomic,assign) int mid;
@property(nonatomic,strong) NSString *name;
@property(nonatomic,strong) NSString *school;

- (void) getAttributes;
- (void) getMethods;

@end

#import "RuntimeVo.h"

@implementation RuntimeVo

//获取属性
- (void) getAttributes{
    unsigned int count = 0;
    Ivar *ivars = class_copyIvarList([RuntimeVo class], &count);
    for (int i=0; i<count; i++) {
        //获取i位置对应的成员变量
        Ivar ivar = ivars[i];
        //查看成员变量
        const char *name = ivar_getName(ivar);
        NSString *key = [NSString stringWithUTF8String:name];
        id value = [self valueForKey:key];
        NSLog(@"key=%@, value====%@",key,value);
    }
}


//获取方法
- (void) getMethods{
    unsigned int count = 0;
    Method *method = class_copyMethodList([RuntimeVo class], &count);
    for (int i=0; i<count; i++) {
        SEL name = method_getName(method[i]);
        NSString *strName = [NSString stringWithCString:sel_getName(name) encoding:NSUTF8StringEncoding];
        NSLog(@"Method name === %@",strName);
    }
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    RuntimeVo *runVo = [[RuntimeVo alloc] init];
    runVo.mid = 1;
    runVo.name = @"测试";
    runVo.school = @"中山";
    
    [runVo getAttributes];
    [runVo getMethods];

}

输出结果为：

2015-07-02 18:36:19.498 Test101[6003:146995] key=_mid, value====1
2015-07-02 18:36:19.499 Test101[6003:146995] key=_name, value====测试
2015-07-02 18:36:19.499 Test101[6003:146995] key=_school, value====中山
2015-07-02 18:36:19.499 Test101[6003:146995] Method name === setMid:
2015-07-02 18:36:19.499 Test101[6003:146995] Method name === setSchool:
2015-07-02 18:36:19.499 Test101[6003:146995] Method name === getAttributes
2015-07-02 18:36:19.499 Test101[6003:146995] Method name === getMethods
2015-07-02 18:36:19.499 Test101[6003:146995] Method name === mid
2015-07-02 18:36:19.500 Test101[6003:146995] Method name === school
2015-07-02 18:36:19.500 Test101[6003:146995] Method name === .cxx_destruct
2015-07-02 18:36:19.500 Test101[6003:146995] Method name === name
2015-07-02 18:36:19.500 Test101[6003:146995] Method name === setName:

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