ios UItextfield 入门

 批量创建UITextField  写成方法然后调用

-(UITextField *)creat_textField : (CGRect)frame
{
    UITextField *text_field = [[UITextField alloc]initWithFrame:frame]; //text_field的位置和大小
    text_field.backgroundColor = [UIColor whiteColor]; //text_field背景颜色
    text_field.borderStyle = UITextBorderStyleRoundedRect; //text_field边框为圆角
    text_field.clearsOnBeginEditing = YES; //text_field在开始编辑时清空
    text_field.keyboardType = UIKeyboardTypeNumberPad ; //text_field键盘为数字键盘
    text_field.delegate = self; //text_field需要实现代理
    text_field.layer.borderColor = [[UIColor blackColor]CGColor]; //text_field边框的颜色
    text_field.layer.borderWidth = 1.0; //text_field边框的宽度
    text_field.layer.cornerRadius = 5.0; //text_field边框圆角的半径
    [self.view addSubview:text_field]; //加载text_field
    return text_field;
    
}

-(void)CreatTextField  //创建textField
{
    self.textField1 = [self creat_textField:CGRectMake(self.view.frame.size.width/6, self.view.frame.size.height/3, self.view.frame.size.width/7, self.view.frame.size.height/15)];
    self.textField2 = [self creat_textField:CGRectMake(self.view.frame.size.width/3, self.view.frame.size.height/3, self.view.frame.size.width/7, self.view.frame.size.height/15)];
    self.textField3 = [self creat_textField:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/3, self.view.frame.size.width/7, self.view.frame.size.height/15)];
    self.textField4 = [self creat_textField:CGRectMake(self.view.frame.size.width/1.5, self.view.frame.size.height/3, self.view.frame.size.width/7, self.view.frame.size.height/15)];
}

  

 

                                               

　//设置背景

  text.background = [UIImage imageNamed:@"dd.png"];//UITextField 的背景，注意只有UITextBorderStyleNone的时候改属性有效

 

//设置背景 

  text.disabledBackground = [UIImage imageNamed:@"cc.png"];

//当输入框没有内容时，水印提示 提示内容为password

  text.placeholder = @"password";

 

//设置输入框内容的字体样式和大小

  text.font = [UIFont fontWithName:@"Arial" size:20.0f];

 

//设置字体颜色

  text.textColor = [UIColor redColor];

 

//输入框中是否有个叉号，在什么时候显示，用于一次性删除输入框中的内容

  text.clearButtonMode = UITextFieldViewModeAlways; 

    UITextFieldViewModeNever,　重不出现

    UITextFieldViewModeWhileEditing, 编辑时出现

    UITextFieldViewModeUnlessEditing,　除了编辑外都出现

    UITextFieldViewModeAlways 　一直出现

 

//输入框中一开始就有的文字

  text.text = @"一开始就在输入框的文字";

 

//每输入一个字符就变成点 用语密码输入

  text.secureTextEntry = YES;

 

//是否纠错

  text.autocorrectionType = UITextAutocorrectionTypeNo;

    UITextAutocorrectionTypeDefault, 默认

    UITextAutocorrectionTypeNo, 　不自动纠错

    UITextAutocorrectionTypeYes,　自动纠错

 

//再次编辑就清空

  text.clearsOnBeginEditing = YES; 

 

//内容对齐方式

  text.textAlignment = UITextAlignmentLeft;

 

//内容的垂直对齐方式  UITextField继承自UIControl,此类中有一个属性contentVerticalAlignment

  text.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

 

//设置为YES时文本会自动缩小以适应文本窗口大小.默认是保持原来大小,而让长文本滚动　

  textFied.adjustsFontSizeToFitWidth = YES;

//设置自动缩小显示的最小字体大小

  text.minimumFontSize = 20;

 

//设置键盘的样式

  text.keyboardType = UIKeyboardTypeNumberPad;

    UIKeyboardTypeDefault,     　默认键盘，支持所有字符         

    UIKeyboardTypeASCIICapable,　支持ASCII的默认键盘

    UIKeyboardTypeNumbersAndPunctuation,　标准电话键盘，支持＋＊＃字符

    UIKeyboardTypeURL,            URL键盘，支持.com按钮 只支持URL字符

UIKeyboardTypeNumberPad,            　数字键盘

UIKeyboardTypePhonePad,　 　电话键盘

    UIKeyboardTypeNamePhonePad, 　电话键盘，也支持输入人名

UIKeyboardTypeEmailAddress, 　用于输入电子 邮件地址的键盘     

UIKeyboardTypeDecimalPad,   　数字键盘 有数字和小数点

    UIKeyboardTypeTwitter,      　优化的键盘，方便输入@、#字符

    UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, 

 

//首字母是否大写

  text.autocapitalizationType = UITextAutocapitalizationTypeNone;

    UITextAutocapitalizationTypeNone, 不自动大写

    UITextAutocapitalizationTypeWords,　单词首字母大写

    UITextAutocapitalizationTypeSentences,　句子的首字母大写

    UITextAutocapitalizationTypeAllCharacters, 所有字母都大写

 

//return键变成什么键

 text.returnKeyType =UIReturnKeyDone;

    UIReturnKeyDefault, 默认 灰色按钮，标有Return

    UIReturnKeyGo,    　标有Go的蓝色按钮

    UIReturnKeyGoogle,标有Google的蓝色按钮，用语搜索

    UIReturnKeyJoin,标有Join的蓝色按钮

    UIReturnKeyNext,标有Next的蓝色按钮

    UIReturnKeyRoute,标有Route的蓝色按钮

    UIReturnKeySearch,标有Search的蓝色按钮

    UIReturnKeySend,标有Send的蓝色按钮

    UIReturnKeyYahoo,标有Yahoo的蓝色按钮

    UIReturnKeyYahoo,标有Yahoo的蓝色按钮

    UIReturnKeyEmergencyCall, 紧急呼叫按钮

 

//键盘外观

textView.keyboardAppearance=UIKeyboardAppearanceDefault；

UIKeyboardAppearanceDefault， 默认外观，浅灰色

UIKeyboardAppearanceAlert，　 　深灰 石墨色

 

 

//设置代理 用于实现协议

  text.delegate = self;

 

//把textfield加到视图中

  [self.window addSubview:text];

 

//最右侧加图片是以下代码　 左侧类似

    UIImageView *image=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];

    text.rightView=image;

    text.rightViewMode = UITextFieldViewModeAlways; 

 

    UITextFieldViewModeNever,

    UITextFieldViewModeWhileEditing,

    UITextFieldViewModeUnlessEditing,

    UITextFieldViewModeAlways

 

//按return键键盘往下收  becomeFirstResponder

 

 

 

通知

UITextField派生自UIControl，所以UIControl类中的通知系统在文本字段中也可以使用。除了UIControl类的标准事件，你还可以使用下列UITextField类特有的事件

 

UITextFieldTextDidBeginEditingNotification

UITextFieldTextDidChangeNotification

UITextFieldTextDidEndEditingNotification

当文本字段退出编辑模式时触发。通知的object属性存储了最终文本。

 

因为文本字段要使用键盘输入文字，所以下面这些事件发生时，也会发送动作通知

 

UIKeyboardWillShowNotification 　//键盘显示之前发送

UIKeyboardDidShowNotification  　//键盘显示之后发送

UIKeyboardWillHideNotification 　//键盘隐藏之前发送

UIKeyboardDidHideNotification  　//键盘隐藏之后发送

 

 

只限制输入特定长度的字符时，可利用光标的位置来判断

//
//-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:
(NSRange)range replacementString:(NSString *)string
//{
//
//    if (range.location >= 1)
//        return NO;
//    return YES;
//    
//    //限制输入长度为1

//}

 限制输入特定的字符 

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:

(NSRange)range replacementString:(NSString *)string{
    NSCharacterSet *cs;
    cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS]invertedSet];
 
    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""]; 

//按cs分离出数组,数组按@""分离出字符串
 
    BOOL canChange = [string isEqualToString:filtered];
 
    return canChange;
}

上面那个NUMBERS是一个宏，可以在文件顶部定义：

#define NUMBERS @”0123456789\n”

 要求四个textfield输入不同的数字时，利用一个数组把数字放进去，把输入过的数字从数组里去除就可以实现了

-(void)begin_array
{
    m_fieldArray = [[NSArray alloc]initWithObjects:self.textField1.text,self.textField2.text,self.textField3.text,self.textField4.text, nil];
    m_beginArray = [[NSMutableArray alloc]initWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9", nil];
    NSMutableArray *restArray = [[NSMutableArray alloc]initWithCapacity:0];
    for (int  m= 0; m < m_fieldArray.count; m ++)
    {
        for (int n = 0; n < m_beginArray.count ;n++)
        {
            if ([[m_fieldArray objectAtIndex:m ] isEqualToString:[m_beginArray objectAtIndex:n]])
            {
                [restArray addObject:[m_beginArray objectAtIndex:n]];
            }
            
        }
    }
    [m_beginArray removeObjectsInArray:restArray];
}


-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:
(NSRange)range replacementString:(NSString *)string
{

    [self begin_array];
    NSString *numbers = [m_beginArray componentsJoinedByString:@""];
    NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:numbers]invertedSet];
    m_filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""];
    BOOL canChange = [string isEqualToString:m_filtered];
    return canChange;
    
    
}//限制输入的字符    一开始时0-9  比如输入1  限制输入的就会变为0，2-9

 限制特殊字符且要限制输入长度时就不能用光标的位置判断了

- (void)textFieldDidBeginEditing:(UITextField *)textField;
{
    [textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
}
//在开始编辑textField时发送通知



-(void)textFieldDidChange:(UITextField *)textField
{
    if ([ self.textField1 isEqual: textField]||[ self.textField2 isEqual: textField]||[ self.textField3 isEqual: textField]||[ self.textField4 isEqual: textField])
    {
        if (textField.text.length > 1)
        {
            textField.text = [textField.text substringToIndex:1];
        }
    }//限制输入的字数为1
    

}