文字輸入框(UITextField)的用法
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let textField
= UITextField (frame: CGRectMake (10,160,200,30))
//設定邊框樣式為圓角矩形
textField.borderStyle
= UITextBorderStyle . RoundedRect
self .view.addSubview(textField)
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textField.placeholder= "請輸入使用者名稱"
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textField.adjustsFontSizeToFitWidth= true //當文字超出文字框寬度時,自動調整文字大小
textField.minimumFontSize=14 //最小可縮小的字號
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/**
水平對齊 **/
textField.textAlignment
= . Right //水平右對齊
textField.textAlignment
= . Center //水平居中對齊
textField.textAlignment
= . Left //水平左對齊
/**
垂直對齊 **/
textField.contentVerticalAlignment
= . Top //垂直向上對齊
textField.contentVerticalAlignment
= . Center //垂直居中對齊
textField.contentVerticalAlignment
= . Bottom //垂直向下對齊
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textField.borderStyle
= . None //先要去除邊框樣式
textField.background= UIImage
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