//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”];
）