Button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;//左对齐(UIControlContentHorizontalAlignment、CenterUIControlContentHorizontalAlignmentFill、UIControlContentHorizontalAlignmentRight)
Button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;//底部对其(UIControlContentVerticalAlignmentCenter、UIControlContentVerticalAlignmentFill、UIControlContentVerticalAlignmentTop)
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