1 你如果想实现类似有的App注册登陆界面的特殊的TextField的左边有个小图片的效果，可以试试下边的几行代码
 2 
 3   UIImageView *imageViewUser = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 30, 20)];
 4     imageViewUser.image = [UIImage imageNamed:@"Contacts"];
 5     
 6     nameTextField.leftView = imageViewUser;
 7     //开启leftView总是显示的模式
 8     nameTextField.leftViewMode=UITextFieldViewModeAlways;
 9 
10 
11 
12     以下内容是赠送的一点常用属性
13 
14 
15     nameTextField.placeholder = @"请输入用户名";
16     //一键清空TextField
17     nameTextField.clearButtonMode = UITextFieldViewModeWhileEditing;
18     nameTextField.borderStyle = UITextBorderStyleRoundedRect;
19     passwdTextField.placeholder = @"请输入密码";
20     //密码的输入的效果
21     passwdTextField.secureTextEntry = YES;