默认center 模式 居中
btn.contentHorizontalAlignment = UIControl.ContentHorizontalAlignment.right
right 和 trailing效果一样
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fill
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leading 和 left 效果一样
if #available(iOS 11.0,*) { btn.contentHorizontalAlignment = UIControl.ContentHorizontalAlignment.leading } else { // Fallback on earlIEr versions }
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