UITextField常用设置小结

1、UITextField的初始化和基本设置

 myTextField = [[UITextField alloc] initWithFrame:CGRectMake(30.0f, 80.0f, 240.0f, 30.0f)];
    [myTextField setBorderStyle:UITextBorderStyleRoundedRect]; //外框类型
    myTextField.placeholder =@"test"; //默认显示的字
    myTextField.returnKeyType = UIReturnKeyDone; //什么类型的回车按钮
    //清空输入的字符模式，设为永不显示清空按钮；UITextFieldViewModeWhileEditing则是在编辑状态时（及获得焦点）显示清空按钮
    myTextField.clearButtonMode = UITextFieldViewModeWhileEditing;

myTextField.delegate=self;

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder]; //软键盘的撤回
    return YES;
}

[textField becomeFirstResponder];

//设置UITextField右边图像
    UIImageView *imgv=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];
    myTextField.rightView=imgv;
    myTextField.rightViewMode = UITextFieldViewModeAlways; //总是显示

//因为UITextField也是UIController，所以可以通过加一个消息事件的方式来响应文本的变化
    [myTextField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

处理函数

- (void) textFieldDidChange:(id) sender {
    UITextField *textField = (UITextField *)sender;
    
    NSLog(@"the text is:%@",textField.text);
}