UITextField--文本框

UITextField是控制文本输入和显示的控件，只能输入单行


#pragma mark UITextField文本框,单行  
      
    //初始化  
    UITextField *myTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 350, 150, 20)];  
  
    //占位字符,没有输入时显示的文本，点击文本框时自动清空  
    myTextField.placeholder = @"请输入手机号";  
  
    //设置键盘样式，数字键盘，字母键盘等  
    myTextField.keyboardType = UIKeyboardTypeNumberPad;  
      
    //设置边框样式  
    myTextField.borderStyle = UITextBorderStyleRoundedRect;  
  
    //设置密码样式，使输入内容隐藏  
    myTextField.secureTextEntry = NO;  
    [self.window addSubview:Line];  
      
    //设置右侧小叉号，点击可以删去所有输入内容  
    myTextField.clearButtonMode = UITextFieldViewModeAlways;  
    //设置首字母大写  
    myTextField.autocapitalizationType = UITextAutocapitalizationTypeWords;  
      
    //通过属性控制是否可以编辑  
    myTextField.enabled = YES;  
  
    //自定义键盘  
    UIView *keyBoardView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.window.frame), 256)];  
     
    //定义一个button放在键盘上  
    UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeSystem];  
    [firstButton setTitle:@"1" forState:UIControlStateNormal];  
    firstButton.frame = CGRectMake(10, 10, 50, 50);  
    [keyBoardView addSubview:firstButton];  
    firstButton.backgroundColor = [UIColor whiteColor];  
    //设置点击效果  
    [firstButton addTarget:self action:@selector(keyButton:) forControlEvents:UIControlEventTouchUpInside];  
      
    myTextField.inputView = keyBoardView;  
      
    //显示  
    [self.window addSubview:myTextField];  
      
    //新建一个输入框，设置代理方法  
    UITextField *delegateTextField = [[UITextField alloc]initWithFrame:CGRectMake(10, 200, 100, 100)];  
    delegateTextField.borderStyle = UITextBorderStyleLine;  
    delegateTextField.placeholder = @"代理方法";  
      
    delegateTextField.keyboardType = UIKeyboardTypeDefault;  
    //设置代理方法，代理人是本类  
    delegateTextField.delegate = self;  
    [self.window addSubview:delegateTextField];  
  
    return YES;  
}  
  
//自定义按钮的  
-(void)keyButton:(UIButton*)sender  
{  
    sender.selected = !sender.selected;  
    UITextField *field = (UITextField*)[self.window viewWithTag:1001];  
    NSString *title = [sender titleForState:UIControlStateNormal];  
    field.text = [field.text stringByAppendingString:title];  
  
    //回收键盘 取消第一响应者 结束编辑状态  
    [field resignFirstResponder];  
  
    //另一种方法回收键盘  
    //[self.view endEditing YES];  
  
    //变为第一响应者  
    [field becomeFirstResponder];  
 }

遵守代理协议<TextFieldDelegate>后可执行下面的方法

#pragma makr 代理方法  
  
//是否可以开始编辑状态  
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField  
{  
    NSLog(@"%s",__func__);  
    return YES;  
}  
  
//已经进入编辑状态  
-(void)textFieldDidBeginEditing:(UITextField *)textField  
{  
    NSLog(@"%s",__func__);  
}  
//是否可以结束编辑  
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField  
{  
    NSLog(@"%s",__func__);  
    return YES;  
}  
//已经结束编辑状态  
-(void)textFieldDidEndEditing:(UITextField *)textField  
{  
    NSLog(@"%s",__func__);  
}  
//点击右下角return按钮所触发的代理方法  
-(BOOL)textFieldShouldReturn:(UITextField *)textField  
{  
    NSLog(@"return");  
    //在此回收键盘  
    [textField resignFirstResponder];  
    return YES;  
}  
  
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  
{  
    //可以限制文字的改变  
    return YES;  
}

设置了代理方法后，UITextField的各种状态会触发代理方法，在本例中代理人设置成了self，也就是本类，然后在本类中实习代理协议要求的方法，这些方法都是@optional的，可以选择性实现

长按文字提示粘贴复制默认是英文，改为中文：
在info.plist中添加Localized resources can be mixed,设置为YES.