iOS开发之UITextField

约定不等于承诺〃 2022-10-02 01:47 207阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

[UITextField][]展示的是一些可编辑的内容，并且与用户有一些交互。比如当你在虚拟键盘上按下return键时，一般会关联到键盘隐藏事件上。UITextField的一些状态大多在UITextFieldDelegate协议中有相应的方法。

\#\#\#\#UITextField的初始化及一些属性\#\#\#\#

//姓名输入域
    UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(30, 30, 200, 44)];
    nameField.tag = 100;
    nameField.delegate = self;
        //默认文字
        nameField.placeholder = @"name";
        nameField.font = [UIFont systemFontOfSize:16.0f];
        nameField.textColor = [UIColor blackColor];
        //输入框的背景图片(还可以选择设置背景颜色)
        nameField.background = [UIImage imageNamed:@"textFieldBackgroundImage"];
        //nameField.backgroundColor = [UIColor lightGrayColor];
        //清除按钮
        nameField.clearButtonMode = UITextFieldViewModeAlways;
        //键盘类型
        nameField.keyboardType = UIKeyboardTypeDefault;
        [self.view addSubview:nameField];
        电话输入域
        UITextField *phoneField = [[UITextField alloc] initWithFrame:CGRectMake(30, nameField.frame.origin.y + nameField.bounds.size.height+10, 200, 44)];
        phoneField.tag = 101;
        phoneField.delegate = self;
        phoneField.placeholder = @"phone";
        phoneField.keyboardType = UIKeyboardTypeDecimalPad;
        phoneField.clearButtonMode = UITextFieldViewModeAlways;
        [self.view addSubview:phoneField];
        //邮箱输入域
        UITextField *emailField = [[UITextField alloc] initWithFrame:CGRectMake(30, phoneField.frame.origin.y + phoneField.bounds.size.height + 10, 200, 44)];
        emailField.tag = 102;
        emailField.delegate = self;
        emailField.placeholder = @"email";
        emailField.keyboardType = UIKeyboardTypeEmailAddress;
        emailField.clearButtonMode = UITextFieldViewModeAlways;
        [self.view addSubview:emailField];

\#\#\#\#UITextField隐藏键盘\#\#\#\# 1.点击键盘的return来隐藏键盘

这个方法需要在相应的.h文件文件中实现UITextFieldDelegate协议。并在.m文件中添加如下方法

- (BOOL)textFieldShouldReturn:(UITextField *)textField
    {
        [textField resignFirstResponder];
        return YES;
    }

2.点击界面空白处来隐藏键盘

这个方法的实现主要是给当前的view增加点击事件，并未点击事件增加相应的处理方法，此处是为了隐藏键盘，所以我们可以在点击事件对应的方法中让UITextField放弃第一响应者。

- (void)dismissKeyboard
    {
        NSArray *subViews = [self.view subviews];
        for (id inputText in subViews) {
            if ([inputText isKindOfClass:[UITextField class]]) {
                if ([inputText isFirstResponder]) {
                    [inputText resignFirstResponder];
                }
            }
        }
    }

为当前的view增加点击事件

UITapGestureRecognizer *dismissKeyboardTap = [[UITapGestureRecognizer alloc] 												initWithTarget:self 												action:@selector(dismissKeyboard)];
    [self.view addGestureRecognizer: dismissKeyboardTap];

\#\#\#\#UITextField－－为内容增加校验\#\#\#\#

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
    {
        switch (textField.tag) {
            case 100://name
            {
                NSLog(@"this is nameField");
                //添加校验name的代码
                break;
            }
            case 101://phone
            {
                NSLog(@"this is phoneField");
                //添加校验phone的代码
                break;
            }
            case 102://email
            {
                NSLog(@"this is emailField");
                //添加校验email的代码
                break;
            }        
            default:
                break;
        }
        return YES;
    }

转载于:https://my.oschina.net/yulei1943/blog/293201

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220113/5017c21af8d749599a50f71eb3f0e392.png
[UITextField]: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextField_Class/Reference/UITextField.html