swift_界面

注册界面

先定义一个image,并设置frame,在添加到父视图上

<pre>
let image = UIImageView(frame: CGRect(x: 140, y: 70, width: 120, height: 100))
self.view.addSubview(image)
image.image = UIImage(named: "人.png")
</pre>

然后再定义一个为用户名的TextField1,初始化并设置frame,添加到父视图

<pre>
self.textField1 = UITextField()
textField1.frame = CGRect(x: 50, y: 200, width: 300, height: 40)
self.view.addSubview(textField1)
</pre>

** 设置textField1的placeholder(输入框的默认值)

<pre>
textField1.placeholder = "请输入用户名"
</pre>

** 设置textField1的边框样式

<pre>
//圆角边框
textField1.borderStyle = .roundedRect
</pre>

** 设置textField1的复选框

<pre>
textField1.leftView = UIImageView(image: UIImage(named: "用户.png"))
textField1.leftViewMode = .always

</pre>

** 设置textField1内部最后面的的删除小圆点
<pre>
textField1.clearButtonMode = .whileEditing
</pre>

我们需要再次定义两个textField，分别为密码的textField2和再次输入密码的textField3，和textField1的内容一样，如以下代码：
<pre>
self.textField2 = UITextField()
textField2.frame = CGRect(x: 50, y: 240, width: 300, height: 40)
self.view.addSubview(textField2)
textField2.placeholder = "请输入密码"
textField2.borderStyle = .roundedRect
textField2.leftView = UIImageView(image: UIImage(named: "锁子.png"))
textField2.clearButtonMode = .whileEditing
textField2.leftViewMode = .always
textField2.isSecureTextEntry = true
let textField3 = UITextField()
textField3.frame = CGRect(x: 50, y: 280, width: 300, height: 40)
self.view.addSubview(textField3)
textField3.placeholder = "请再次输入密码"
textField3.borderStyle = .roundedRect
textField3.leftView = UIImageView(image: UIImage(named: "锁子.png"))
textField3.clearButtonMode = .whileEditing
textField3.leftViewMode = .always
textField3.isSecureTextEntry = true
</pre>

定义一个button按钮，设置其内容

<pre>
let btn = UIButton(frame: CGRect(x: 50, y: 340, width: 300, height: 40))
self.view.addSubview(btn)
btn.backgroundColor = UIColor.blue
btn.setTitle("注册", for: .normal)
btn.addTarget(self, action: #selector(btnAction(btn:)), for: .touchUpInside)
</pre>

给button设置一个点击事件

<pre>
func btnAction(btn:UIButton) {
if let _ = self.textField1.text {
if (self.textField1.text?.characters.count)! < 6{
self.textField1.text="用户名不能低于6位"
return
}
if (self.textField1.text?.characters.count)! > 13{
self.textField1.text="用户名不能高于13位"
return
}
if self.textField1.text == self.textField2.text{
self.textField2.text="用户名和密码不能相同"
return
}
}
}
</pre>