OC获取类的成员变量/属性/方法

引入头文件：#import <objc/runtime.h>

    unsigned int numIvars; //成员变量个数
    Ivar *vars = class_copyIvarList(NSClassFromString(@"NSObject"), &numIvars);
    NSString *key=nil;
    for(int i = 0; i < numIvars; i++) {
        
        Ivar thisIvar = vars[i];
        key = [NSString stringWithUTF8String:ivar_getName(thisIvar)];  //获取成员变量的名字
        NSLog(@"variable name :%@", key);
    }
    free(vars);
    
    objc_property_t *properties = class_copyPropertyList(NSClassFromString(@"NSObject"), &numIvars);
    for(int i = 0; i < numIvars; i++) {
        objc_property_t thisIvar = properties[i];
        
        NSString *propertyName = [NSString stringWithUTF8String:property_getName(thisIvar)];
        
        NSLog(@"property :%@", propertyName);
    }
    free(properties);
    
    Method *methods = class_copyMethodList(NSClassFromString(@"NSObject"), &numIvars);
    for(int i = 0; i < numIvars; i++) {
        Method thisIvar = methods[i];
        
        SEL sel = method_getName(thisIvar);
        const char *name = sel_getName(sel);
        
        NSLog(@"method :%s", name);
    }
    free(methods);