UITextfield

//输入框
UITextField *textField = [ [UITextField alloc] initWithFrame:CGRectMake(100,100,100,40)];
textField.backgroundColor = [UIColor cyanColor];
[self.window addSubview:textField];
[textField release];
//边框,圆角,文本,透明度,文本字体
textField.layer.borderWidth = 1;
textField.layer.cornerRadius = 10;
textField.text = @"";
textField.alpha = 0.5;
textField.font = [UIFont systemFontOfSize:18];
//占位文本
textField.placeholder = @"请输入账号";
//使用圆点代替输入内容,在输入密码等不直接显示输入内容时可以把文本转换成圆点 (BOOL)
textField.secureTextEntry = YES;
//设置键盘格式(枚举类型,有多种形式)
textField.keyboardType = UIReturnKeySearch;
//文本运行时清空输入框内内容
textField.clearsOnBeginEditing = YES;
//清除按钮样式(枚举类型)
textField.clearButtonMode = UITextFieldViewModeAlways;

//先创建一个view
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];
//弹出一个自定义的视图,默认是键盘;
textField.inputView;
//给键盘添加一个辅助视图
textField.inputAcceddoryView = view;

//回收键盘需要签订UITextFieldDelegate协议,并设定代理人
//签订协议将UITextFieldDelegate加到.h中
//设置代理人
self.textField.delegate = self;
//设置方法
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
//这句话是实现协议的关键
[ textField resignFirstResponder ];
return YES;
}