需要实现这样的文本输入框：
swift textfield placeholder click move up
objective c – PlaceHolder animates when start typing in TextField in iOS – Stack Overflow
iphone – Text in UITextField moves up after editing (center while editing) – Stack Overflow
UITextView Placeholder Text in Swift (IBDesignable in IB) | iOS Insight
swift textfield lib
去试试：
raulriera/TextFieldEffects: Custom UITextFields effects inspired by Codrops, built using Swift
Cartfile中添加：
github "raulriera/TextFieldEffects"
再去更新：
carthage update TextFieldEffects –platform iOS
即：
licrifandeMacBook-Pro:SalesAppiOS crifan$ carthage update TextFieldEffects –platform iOS
*** Cloning TextFieldEffects
*** Fetching MGSwipeTableCell
*** Fetching SwiftHEXColors
*** Fetching Charts
*** Fetching SwiftKeychainWrapper
*** Fetching Alamofire
*** Fetching XCGLogger
*** Fetching realm-cocoa
*** Fetching Cartography
*** Checking out TextFieldEffects at "1.2.0"
*** xcodebuild output can be found in /var/folders/46/2hjxz38n22n3ypp_5f6_p__00000gn/T/carthage-xcodebuild.mhr3in.log
*** Building scheme "TextFieldEffects" in TextFieldEffects.xcodeproj
代码：
var phoneTextField:HoshiTextField
self.phoneTextField = HoshiTextField()
self.addSubview(self.phoneTextField)
//3. phone number textFiled
self.phoneTextField.placeholder = "手机号"
// self.phoneTextField.foregroundColor = UIColor.lightGrayColor()
//self.phoneTextField.borderActiveColor = UIColor.blueColor()
self.phoneTextField.keyboardType = UIKeyboardType.PhonePad
constrain(phoneTextField) {phoneTextField in
//phoneTextField.top == phoneTextField.superview!.top + (LoginLogoImageHeigh + SwitchActionHeight + 10)
phoneTextField.top == phoneTextField.superview!.top + LoginPhonePaddingTop
phoneTextField.centerX == phoneTextField.superview!.centerX
phoneTextField.width == phoneTextField.superview!.width – 2 * LoginPaddingX
phoneTextField.height == LoginTextFieldHeight
}
效果：
点击后：
－》但是没有底下的颜色。。。
－》折腾了半天，发现
库中用的是：
TextFieldEffects/HoshiTextField.swift at master · raulriera/TextFieldEffects
@IBInspectable dynamic public var borderActiveColor: UIColor? {
didSet {
updateBorder()
}
}
暴露出的接口是：
/**
An HoshiTextField is a subclass of the TextFieldEffects object, is a control that displays an UITextField with a customizable visual effect around the lower edge of the control.
*/
@IBDesignable public class HoshiTextField : TextFieldEffects.TextFieldEffects {
/**
The color of the border when it has no content.
This property applies a color to the lower edge of the control. The default value for this property is a clear color.
*/
@IBInspectable dynamic public var borderInactiveColor: UIColor?
/**
The color of the border when it has content.
This property applies a color to the lower edge of the control. The default value for this property is a clear color.
*/
@IBInspectable dynamic public var borderActiveColor: UIColor?
但是却没有办法通过：
self.phoneTextField.borderActiveColor = UIColor.blueColor()
去设置变量。
－》后来发现是自己之前写成：
var phoneTextField:UITextField
后来改为：
var phoneTextField:HoshiTextField
就可以正常设置值了：
self.phoneTextField.placeholder = "手机号"
self.phoneTextField.borderInactiveColor = UIColor.grayColor()
self.phoneTextField.borderActiveColor = UIColor.grayColor()
然后就可以了：
