重写TextField Rect 改变显示位置

很简单很常用的一些东西，希望给需要的人帮助。

效果图如下：

自定义textField

init() {

        super.init(frame: CGRect(x: , y: , width: yourWidth, height: yourHeight))
　　　　　　

　　　　　//光标颜色修改　　

　　　　　self.tintColor = UIColor.orangeColor()

    }

override func editingRectForBounds(bounds: CGRect) -> CGRect {        

        return CGRectInset(bounds, , );

    }

    override func textRectForBounds(bounds: CGRect) -> CGRect {

        return CGRectInset(bounds, , )

    }

    override func placeholderRectForBounds(bounds: CGRect) -> CGRect {

                return CGRectInset(bounds, , )

    }

    override func leftViewRectForBounds(bounds: CGRect) -> CGRect {

        var iconRect = super.leftViewRectForBounds(bounds)

        iconRect.origin.x = iconRect.origin.x + 

        return iconRect

    }

然后在需要使用的controller调用即可

//其他非相关代码已省略

func setupMobelLoginUI(){
        ...
        mobTxtFld.backgroundColor = LoginConst.tfBackgroundColor
        mobTxtFld.layer.cornerRadius = LoginConst.commonHeight /
        mobTxtFld.clipsToBounds = true
        mobTxtFld.layer.borderColor = LoginConst.tfBorderColor.CGColor
        mobTxtFld.layer.borderWidth = 

        //leftView相关设置
        let mobIcon = UIImageView(image: UIImage(named: "login_mobile"))
        mobTxtFld.leftViewMode = UITextFieldViewMode.Always
        mobTxtFld.leftView = mobIcon

        view.addSubview(mobTxtFld)
        mobTxtFld.snp_makeConstraints { (make) in
            make.top.equalTo(titleLb.snp_bottom).offset(LoginConst.topVOffset)
            make.centerX.equalTo(self.view)
            make.width.equalTo()
            make.height.equalTo(LoginConst.commonHeight)
        }
        
　　　　 //leftView相关设置
        let codeIcon = UIImageView(image: UIImage(named: "login_yanzheng"))
        verifyCodeTxtFld.leftViewMode = UITextFieldViewMode.Always
        verifyCodeTxtFld.leftView = codeIcon

        verifyCodeTxtFld.backgroundColor = LoginConst.tfBackgroundColor
        verifyCodeTxtFld.layer.cornerRadius = LoginConst.commonHeight /
        verifyCodeTxtFld.layer.masksToBounds = true
        verifyCodeTxtFld.layer.borderColor = LoginConst.tfBorderColor.CGColor
        verifyCodeTxtFld.layer.borderWidth = 

        view.addSubview(verifyCodeTxtFld)
        verifyCodeTxtFld.snp_makeConstraints { (make) in
          make.top.equalTo(mobTxtFld.snp_bottom).offset(LoginConst.verifyVMargin)
            make.width.height.centerX.equalTo(mobTxtFld)
        }
    ...
    }