在Ios中仅创建底线的文本字段

Question

是否可以在Ios中创建仅显示底部边界线而不显示顶部和侧边线的文本字段。如果是的话，我该如何实现这个

Answer 1

是的，这是可能的。这里是如何做到这一点：

CALayer *border = [CALayer layer]; 
CGFloat borderWidth = 2; 
border.borderColor = [UIColor darkGrayColor].CGColor; 
border.frame = CGRectMake(0, textField.frame.size.height - borderWidth, textField.frame.size.width, textField.frame.size.height); 
border.borderWidth = borderWidth; 
[textField.layer addSublayer:border]; 
textField.layer.masksToBounds = YES; 

希望这有助于！

Answer 2

User4645956在迅速解决

private func addBottomLineToTextField(textField : UITextField) { 
    let border = CALayer() 
    let borderWidth = CGFloat(1.0) 
    border.borderColor = UIColor.whiteColor().CGColor 
    border.frame = CGRectMake(0, textField.frame.size.height - borderWidth, textField.frame.size.width, textField.frame.size.height) 
    border.borderWidth = borderWidth 
    textField.layer.addSublayer(border) 
    textField.layer.masksToBounds = true 
} 

用法：

self.addBottomLineToTextField(usernameTextField) 
    self.addBottomLineToTextField(passwordTextField) 

Answer 3

斯威夫特：

extension UITextField { 

    func useUnderline() { 

     let border = CALayer() 
     let borderWidth = CGFloat(1.0) 
     border.borderColor = UIColor.blackColor().CGColor 
     border.frame = CGRectMake(0, self.frame.size.height - borderWidth, self.frame.size.width, self.frame.size.height) 
     border.borderWidth = borderWidth 
     self.layer.addSublayer(border) 
     self.layer.masksToBounds = true 
    } 
} 

这样称呼它：

yourtextFieldName.useUnderline() 

Answer 4

只需使用CALayer的依奥斯

CALayer *bottomBorder = [CALayer layer]; 
bottomBorder.frame = CGRectMake(0.0f, self.passwordField.frame.size.height - 1, self.passwordField.frame.size.width, 1.0f); 
bottomBorder.backgroundColor = [UIColor blackColor].CGColor; 
[self.passwordField.layer addSublayer:bottomBorder]; 

Answer 5

更新了雨燕3.0

extension UITextField {  

    func useUnderline() { 
     let border = CALayer() 
     let borderWidth = CGFloat(1.0) 
     border.borderColor = UIColor.lightGray.cgColor 
     border.frame = CGRect(origin: CGPoint(x: 0,y :self.frame.size.height - borderWidth), size: CGSize(width: self.frame.size.width, height: self.frame.size.height)) 
     border.borderWidth = borderWidth 
     self.layer.addSublayer(border) 
     self.layer.masksToBounds = true 
    } 
}