美观简洁的数字键盘，支持小数、整数、负数、文本长度的控制

效果图

EBNumberTextField.gif

github地址:https://github.com/woheduole/EBCustomControls

调用示例

    EBNumberTextField *textField = [[EBNumberTextField alloc] initWithFrame:CGRectMake(115, y, 150, 30)];
    // 键盘类型
    textField.numberKeyboardType = EBNumberKeyboardTypeInteger;
    // 文本长度
    textField.maxLength = 5;
    [self.view addSubview:textField];

实现步骤

• 定义一个键盘视图EBNumberKeyboardView在里面写好布局，代码没什么难点，这里就不贴出布局代码了，代理里面我定义了四个回调方法。

@protocol EBNumberKeyboardViewDelegate <NSObject>
@optional
// 输入数字、小数点、负号
- (void)numberKeyboardViewEditing:(EBNumberKeyboardView *)keyboardView text:(NSString*)text;
// 点击完成输入
- (void)numberKeyboardViewEndEditing:(EBNumberKeyboardView *)keyboardView;
// 删除字符
- (void)numberKeyboardViewDeleteText:(EBNumberKeyboardView *)keyboardView;
// 清空文本
- (void)numberKeyboardViewClearText:(EBNumberKeyboardView *)keyboardView;
@end

• 定义一个继承自UITextField的视图EBNumberTextField，在里面指定self.inputView = "定义的键盘视图"。

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        _maxLength = 0;
        EBNumberKeyboardView *numberKeyboardView = [[EBNumberKeyboardView alloc] initWithKeyboardType:EBNumberKeyboardTypeDecimal];
        numberKeyboardView.delegate = self;
        self.inputView = numberKeyboardView;
        /*
         1.当使用第三方键盘管理类IQKeyboardManager，禁用toolBar
         2.如果没有用到第三方键盘管理可以不加这行代码
         3.可以把[UIView new]替换成一个自定义的视图来实现IQKeyboardManager的toolbar功能
         */
        self.inputAccessoryView = [UIView new];
        _numberKeyboardView = numberKeyboardView;
    }
    return self;
}

#pragma mark - EBNumberKeyboardViewDelegate
// 输入数字、小数点、负号
- (void)numberKeyboardViewEditing:(EBNumberKeyboardView *)keyboardView text:(NSString*)text {
    if ([text isEqualToString:kEBNumberKeyboardViewDotKey]) {
        // 小数点不能在第一位并且只能有一个小数点
        if (self.text.length == 0
            || [self.text rangeOfString:kEBNumberKeyboardViewDotKey].location != NSNotFound) {
            return;
        }
    }else if([text isEqualToString:kEBNumberKeyboardViewMinusKey]) {
        // 负号只能在第一位
        if (self.text.length > 0) {
            return;
        }
    }
    NSString *fullText = [self.text stringByAppendingString:text];
    if (_maxLength >0 && fullText.length > _maxLength) {
        return;
    }
    [self insertText:text];
}
// 点击完成输入
- (void)numberKeyboardViewEndEditing:(EBNumberKeyboardView *)keyboardView {
    [self resignFirstResponder];
}
// 删除字符
- (void)numberKeyboardViewDeleteText:(EBNumberKeyboardView *)keyboardView {
    [self deleteBackward];
}
// 清空文本
- (void)numberKeyboardViewClearText:(EBNumberKeyboardView *)keyboardView {
    self.text = @"";
}

注意：
调用[self insertText:text]插入输入文本，这样光标在哪，插入的代码就在哪。
通过[self deleteBackward]删除文本，会从光标那里开始往前删除。