小知识积累

字符串转换为类：Class class =NSClassFromString(className)

获取类名的字符串：NSString *temStr = [NSStringstringWithUTF8String:object_getClassName(self)];

在屏幕上画1像素的线：

1.写代码实现时：

#define POINTS_FROM_PIXELS(__PIXELS) (__PIXELS / [[UIScreen mainScreen] scale])

#define ONE_PIXEL POINTS_FROM_PIXELS(1.0)

用宏 ONE_PIXEL
来实现

2.用xib实现时候 则用：

-(void)awakeFromNib {

self.layer.borderColor = [self.backgroundColor
CGColor];

self.layer.borderWidth = (1.0
/ [UIScreen mainScreen].scale) /
2;

self.backgroundColor = [UIColor
clearColor];

}