//button 文字左对齐
butT.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
按钮图片与文字位置
[btn1 setTitleEdgeInsets:UIEdgeInsetsMake(0, -btn1.imageView.width, 0, btn1.imageView.width)];
[btn1 setImageEdgeInsets:UIEdgeInsetsMake(0, btn1.titleLabel.width, 0, -btn1.titleLabel.width)];