//swift3.0，如果是2.0的话也可以照着这个样子去写，语法有所变动。根据联想出来的就可以了。
let tx = UITextField(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
tx.borderStyle = UITextBorderStyle.roundedRect
//所有类型
// typedef enum {
// UITextBorderStyleNone,
// UITextBorderStyleLine,
// UITextBorderStyleBezel,
// UITextBorderStyleRoundedRect
// } UITextBorderStyle;
tx.layer.borderWidth = 1; //边框的宽度
tx.layer.borderColor = UIColor.green.cgColor //边框的颜色，也可以自己定义颜色，可以使用 R,G，B了比如
// tx.layer.borderColor = UIColor(red: 225/225.0, green: 30/225.0, blue: 40/225.0, alpha: 1.0).cgColor
view.addSubview(tx)
2.0扩展，字体的设置（加粗倾斜等）
label.font＝[UIFont fontWithName:@"ArialMT"size:24]; //fontWithName处字体不知道名字,可以看下面图片字体对照！ 1.字体名如下（图片对照在最下面）：
Font Family: American Typewriter Font: AmericanTypewriter Font: AmericanTypewriter-Bold Font Family: AppleGothic Font: AppleGothic Font Family: Arial Font: ArialMT Font: Arial-BoldMT Font: Arial-BoldItalicMT Font: Arial-ItalicMT Font Family: Arial Rounded MT Bold Font: ArialRoundedMTBold Font Family: Arial Unicode MS Font: ArialUnicodeMS Font Family: Courier Font: Courier Font: Courier-BoldOblique Font: Courier-Oblique Font: Courier-Bold Font Family: Courier New Font: CourierNewPS-BoldMT Font: CourierNewPS-ItalicMT Font: CourierNewPS-BoldItalicMT Font: CourierNewPSMT Font Family: DB LCD Temp Font: DBLCDTempBlack Font Family: Georgia Font: Georgia-Bold Font: Georgia Font: Georgia-BoldItalic Font: Georgia-Italic Font Family: Helvetica Font: Helvetica-Oblique Font: Helvetica-BoldOblique Font: Helvetica Font: Helvetica-Bold Font Family: Helvetica Neue Font: HelveticaNeue Font: HelveticaNeue-Bold Font Family: Hiragino Kaku Gothic **** W3 Font: HiraKakuProN-W3 Font Family: Hiragino Kaku Gothic **** W6 Font: HiraKakuProN-W6 Font Family: Marker Felt Font: MarkerFelt-Thin Font Family: STHeiti J Font: STHeitiJ-Medium Font: STHeitiJ-Light Font Family: STHeiti K Font: STHeitiK-Medium Font: STHeitiK-Light Font Family: STHeiti SC Font: STHeitiSC-Medium Font: STHeitiSC-Light Font Family: STHeiti TC Font: STHeitiTC-Light Font: STHeitiTC-Medium Font Family: Times New Roman Font: TimesNewRomanPSMT Font: TimesNewRomanPS-BoldMT Font: TimesNewRomanPS-BoldItalicMT Font: TimesNewRomanPS-ItalicMT Font Family: Trebuchet MS Font: TrebuchetMS-Italic Font: TrebuchetMS Font: Trebuchet-BoldItalic Font: TrebuchetMS-Bold Font Family: Verdana Font: Verdana-Bold Font: Verdana-BoldItalic Font: Verdana Font: Verdana-Italic Font Family: Zapfino Font: Zapfino这里写图片描述
修改textField的placeholder的字体颜色、大小
使用KVO实现
textField.placeholder = @”username is in here!”;
[textField setValue:[UIColor redColor] forKeyPath:@”_placeholderLabel.textColor”];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@”_placeholderLabel.font”];
）