如果我们的类中没有实现description 和debugDescription，当我们NSLog或者po的时候，输出的仅仅是一个内存地址，如下(lldb) po animal <Animal:0x608000003cb0>(lldb):，这样对我们查看model里面的字段是很不方便的，因此我们需要打印属性的类可以实现下面的方法
- (NSString *)description{
return [NSString stringWithFormat:@"%@",[self properties_values]];
}
- (NSString *)debugDescription{
return [NSString stringWithFormat:@"%@",[self properties_values]];
}
#pragma mark---获取对象的所有属性 以及属性值
- (NSDictionary *)properties_values
{
NSMutableDictionary *props = [NSMutableDictionary dictionary];
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList([self class], &outCount);
for (i = 0; i<outCount;i++)
{
objc_property_t property = properties[i];
const char* char_f =property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
id propertyValue = [self valueForKey:(NSString *)propertyName];
if (propertyValue) [props setObject:propertyValue forKey:propertyName];
}
free(properties);
return props;
}
注意：需要导入头文件--#import<objc/runtime.h>,因为获取对象的所有属性 以及属性值是利用运行时实行的，下面是利用运行时遍历对象的属性和方法
1、/* 获取对象的所有属性，不包括属性值 */
- (NSArray *)getAllProperties
{
u_int count;
objc_property_t *properties =class_copyPropertyList([self class], &count);
NSMutableArray *propertiesArray = [NSMutableArray arrayWithCapacity:count];
for (int i = 0; i<count; i++)
{
const char* propertyName =property_getName(properties[i]);
[propertiesArray addObject: [NSString stringWithUTF8String: propertyName]];
}
free(properties);
return propertiesArray;
}
2、/* 获取对象的所有属性 以及属性值 */
- (NSDictionary *)properties_aps
{
NSMutableDictionary *props = [NSMutableDictionary dictionary];
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList([self class], &outCount);
for (i = 0; i<outCount; i++)
{
objc_property_t property = properties[i];
const char* char_f =property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
id propertyValue = [self valueForKey:(NSString *)propertyName];
if (propertyValue) [props setObject:propertyValue forKey:propertyName];
}
free(properties);
return props;
}
3、/* 获取对象的所有方法 */
-(void)printMothList
{
unsigned int mothCout_f =0;
Method* mothList_f = class_copyMethodList([self class],&mothCout_f);
for(int i=0;i<mothCout_f;i++)
{
Method temp_f = mothList_f[i];
IMP imp_f = method_getImplementation(temp_f);
SEL name_f = method_getName(temp_f);
const char* name_s =sel_getName(method_getName(temp_f));
int arguments = method_getNumberOfArguments(temp_f);
const char* encoding =method_getTypeEncoding(temp_f);
NSLog(@"方法名：%@,参数个数：%d,编码方式：%@",[NSString stringWithUTF8String:name_s],
arguments,[NSString stringWithUTF8String:encoding]);
}
free(mothList_f);
}
