1.基础设置（颜色、字体等）
_button = [[UIButton alloc] init];
//背景颜色
_button.backgroundColor = [UIColor brokerWhiteColor];
[_button setTitleColor:[UIColor brokerOrangeColor]
forState:UIControlStateNormal];
//文字颜色
_button.titleLabel.font = [UIFont systemFontOfSize:14];//字体
//圆角
_button.layer.masksToBounds = YES;
_button.layer.cornerRadius = 10;
//图片（默认在左）
[_button setImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];
2.图片和文字的位置
图片在右
NSString *str = @"";
CGFloat titleWidth = [str sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]}].width;
[self.button setTitle:str forState:UIControlStateNormal];
CGFloat space = 5;
CGFloat imageWidth = 13;
[self.button setTitleEdgeInsets:UIEdgeInsetsMake(0, -imageWidth, 0, imageWidth)];
[self.button setImageEdgeInsets:UIEdgeInsetsMake(0, titleWidth + space, 0, -titleWidth-space)];
