iOS开发-UI (五)UITextField

UITextField使用

1.创建方式

　例：

UITextField *text = [[UITextField alloc]initWithFrame:CGRectMake(20, 20, 130, 30)];

2.常用方法和属性

1）边框样式

@property(nonatomic)  UITextBorderStyle   borderStyle;

UITextBorderStyleNone                       没有边框,背景默认为透明

UITextBorderStyleLine                       线框,背景默认为透明

UITextBorderStyleBezel bezel           风格边框,背景默认为透明

UITextBorderStyleRoundedRect         圆角边框,背景默认为白色

textField.borderStyle = UITextBorderStyleBezel;

2）提示文字: placeholder

textField.placeholder = @"请输入银行卡密码";

3）键盘类型: keyboardType

textField.keyboardType = UIKeyboardTypeNumberPad;

4）键盘样式: keyboardAppearance

textField.keyboardAppearance = UIKeyboardAppearanceLight;

5）密文输入: secureTextEntry

textField.secureTextEntry = YES;

6）再次编辑是否清空: clearsOnBeginEditing

textField.clearsOnBeginEditing = YES;

7）文本横向对齐方式: textAlignment

textField.textAlignment = NSTextAlignmentRight;

8）文本滚动: adjustsFontSizeToFitWidth

搭配 minimumFontSize一起使用

//回收键盘

[self.view endEditing: YES];

9）return键类型:returnKeyType

@property(nonatomic) UIReturnKeyType returnKeyType;

UIReturnKeyDefault,

UIReturnKeyGo,

UIReturnKeyGoogle,

UIReturnKeyJoin,

UIReturnKeyNext,

UIReturnKeyRoute,

UIReturnKeySearch,

UIReturnKeySend,

UIReturnKeyYahoo,

UIReturnKeyDone,

UIReturnKeyEmergencyCall,

10）清理按钮模式:clearButtonMode

@property(nonatomic)        UITextFieldViewMode  clearButtonMode;

UITextFieldViewModeNever,

UITextFieldViewModeWhileEditing,

UITextFieldViewModeUnlessEditing,

UITextFieldViewModeAlways

3.UITextFieldDelegate 协议

1）是否可以进入编辑模式

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField;

//返回NO，无法进入编辑状态

return YES;

2）文本框已经进入编辑模式

-(void)textFieldDidBeginEditing:(UITextField *)textField;

3）文本框是否可以结束编辑模式

-(BOOL)textFieldShowEndEditing:(UITextField *)textField;

//返回NO，无法结束编辑状态

return YES;

4）文本框已结束编辑模式

-(void)textFieldDidEndEditing:(UITextField *)textField;

5）是否可以点击clear按钮

-(BOOL)textFieldShouldClear:(UITextField *)textField;

//返回NO，点击clear按钮无响应

return YES;

6）是否可以点击return按钮

-(BOOL)textFieldShouldReturn:(UITextField *)textField;

//移除第一响应者

[textField resignFirstResponder];

return YES;

7）允许修改内容

- (BOOL)textField:(UITextField *)textField 

shouldChangeCharactersInRange:(NSRange)range 

    replacementString:(NSString *)string;

  例如:

if (textField.text.length >= 6) {
        if ([string isEqualToString:@""]) {

            return YES;
        }
        return NO;

    }
    return YES;
 }