//让Btn中的文本框左对齐
lableBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
//让向右偏移20像素，不会紧贴着很难看
lableBtn.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
UIButton 中title左对齐
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//让Btn中的文本框左对齐
lableBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
//让向右偏移20像素，不会紧贴着很难看
lableBtn.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);