图片宽度:15.f
[_titleBtn setTitle:title forState:UIControlStateNormal];
CGSize titleSize = [title sizeWithAttributes:@{NSFontAttributeName: [UIFont fontWithName:_titleBtn.titleLabel.font.fontName size:_titleBtn.titleLabel.font.pointSize]}];
[_titleBtn setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, 15)];
[_titleBtn setImageEdgeInsets:UIEdgeInsetsMake(0, titleSize.width+15, 0, -titleSize.width)];
[_titleBtn layoutIfNeeded];//刷新,必须加上,不然没有效果