1:一句话移除父视图所有的子视图
[view.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
2:详细打印
#ifdef DEBUG
# define LWXLog(fmt, ...) NSLog((@"[文件名:%s]\n" "[函数名:%s]\n" "[行号:%d] \n" fmt), __FILE__, __FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
# define LWXLog(...);
#endif
