2017笔记——自定义键盘

项目需求：

IMG_0411.PNG

输入身份证号，需要X这个东西，只能自己写了。

构建这个输入视图简单，各个按钮配置Tag即可。

每个按钮需要添加两个点击事件：touchUpInside 和touchDown。

设置self.TextFieldNo.inputView = self.customKeyView即可。

关键是处理点击事件：

#pragma mark - 点击键盘数字

- (void)numberClick:(UIButton *)btn {

    if (btn.tag == 10 || btn.tag == 12) {

        btn.backgroundColor = [UIColor colorWithHexString:@"#D1D5DB"];

    }else{

        btn.backgroundColor = [UIColor colorWithHexString:@"#FFFFFF"];

    }

    UIButton *selectedB = btn;

    self.TextFieldNo.textColor = [UIColor colorWithHexString:@"#2D2D2D"];

    //删除键

    if (selectedB.tag == 12) {

        if (self.TextFieldNo.text.length > 0) {

            //需要考虑光标位置

            NSInteger location = [self selectedRange].location;

            NSInteger newLocation = location;

            NSInteger foreLocation = location-1;

            NSString *oneString,*twoString;

            if (foreLocation >= 0) {

                oneString = [self.TextFieldNo.text substringToIndex:foreLocation];

                twoString = [self.TextFieldNo.text substringFromIndex:location];

                newLocation = foreLocation;

            }else{

                twoString = self.TextFieldNo.text;

            }

            if (oneString.length == 0) {

                oneString = @"";

            }

            if (twoString.length == 0 ) {

                twoString = @"";

            }

            NSString *newString = [NSString stringWithFormat:@"%@%@",oneString,twoString];

            self.TextFieldNo.text = newString;

            [self setSelectedRange:NSMakeRange(newLocation, 0)];

        }

    }else {

        //需要考虑用户滑动光标的操作，不能直接添在最后一位

        NSString *newString = selectedB.titleLabel.text;

        NSInteger location = [self selectedRange].location;

        NSMutableString *allString = [NSMutableString stringWithFormat:@"%@",self.TextFieldNo.text];

        [allString insertString:newString atIndex:location];

        self.TextFieldNo.text = allString;

        [self setSelectedRange:NSMakeRange(location+1, 0)];

    }

}

//获取当前range

-(NSRange)selectedRange{

    NSInteger location = [self.TextFieldNo offsetFromPosition:self.TextFieldNo.beginningOfDocument toPosition:self.TextFieldNo.selectedTextRange.start];

    NSInteger length = [self.TextFieldNo offsetFromPosition:self.TextFieldNo.selectedTextRange.start toPosition:self.TextFieldNo.selectedTextRange.end];

    return NSMakeRange(location, length);

}

//设置range

- (void) setSelectedRange:(NSRange) range

{

    UITextPosition* beginning = self.TextFieldNo.beginningOfDocument;

    UITextPosition* startPosition = [self.TextFieldNo positionFromPosition:beginning offset:range.location];

    UITextPosition* endPosition = [self.TextFieldNo positionFromPosition:beginning offset:range.location + range.length];

    UITextRange* selectionRange = [self.TextFieldNo textRangeFromPosition:startPosition toPosition:endPosition];

    [self.TextFieldNo setSelectedTextRange:selectionRange];

}

//点击按下后变色

- (void)numberTouchDown:(UIButton*)sender

{

    if (sender.tag == 10 || sender.tag == 12) {

        sender.backgroundColor = [UIColor colorWithHexString:@"#FFFFFF"];

    }else{

        sender.backgroundColor = [UIColor colorWithHexString:@"#D1D5DB"];

    }

}

加油～