//corner角落Radius半径
self.loginBtn.layer.cornerRadius = 5;
//masks掩饰ToBounds边界线
self.loginBtn.layer.masksToBounds = YES;
//cell里面的头像变成圆形
- (void)awakeFromNib
{
self.tag_image.layer.cornerRadius=self.tag_image.frame.size.width*0.5;
self.tag_image.layer.masksToBounds=YES;
}