纯净、安全、绿色的下载网站

首页|软件分类|下载排行|最新软件|IT学院

当前位置:首页IT学院IT技术

iOS计算器功能 iOS开发实现计算器功能

Billy Miracle   2021-10-10 我要评论
想了解iOS开发实现计算器功能的相关内容吗,Billy Miracle在本文为您仔细讲解iOS计算器功能的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:iOS,计算器,下面大家一起来学习吧。

效果图

Masonry

使用数组来自动约束

NSArray *buttonArrayOne = @[_buttonAC, _buttonLeftBracket, _buttonRightBracket, _buttonDivide];
    //withFixedSpacing: 每个view中间的间距
    //leadSpacing: 左最开始的间距
    //tailSpacing:; 右边最后的的间距
    [buttonArrayOne mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:15 leadSpacing:15 tailSpacing:15];
    [buttonArrayOne mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(@(selfHeight - (buttonHeight * 5 + 110)));
        make.height.equalTo(@(buttonHeight));
    }];

对最后一行单独处理

 [_buttonZero mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(@15);
        make.top.equalTo(@(selfHeight - (buttonHeight + 50)));
        make.width.equalTo(@(buttonWidth * 2 + 15));
        make.height.equalTo(@(buttonHeight));
    }];
    
    [_buttonZero.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(_buttonOne.titleLabel);
    }];
    //使0的数字对齐

计算部分:

+ (Result)CalculateFor:(char*) formula andLen: (long) length {
    Result result = {0, 0.0f};
    int numberOfDots = 0;
    int index;
    int digitsNum = 0;
    float digits[CALCULATE_MAX_DIGITS];
    memset(digits, 0, sizeof(digits));
    int optNum = 0;
    char operator[CALCULATE_MAX_OPERATOR];
    memset(operator, 0, sizeof(operator));
    int digitNum = 0;
    char digit[CALCULATE_MAX_DIGIT];
    memset(digit, 0, sizeof(digit));
    char *p = formula;
    while (length--) {
        switch (*p) {
            case '+':
            case '-':
            case '*':
            case '/':
                numberOfDots = 0;
                if (0 == digitNum && '-' == *p) {
                    digit[digitNum++] = *p;
                } else {
                    if (-1 == digitNum) {
                        //刚计算过括号,符号前可以没有数字读入
                    } else if (0 == digitNum || CALCULATE_MAX_DIGITS == digitsNum - 1) {
                        result.error = CALCULATE_ERR;
                        return result;
                    } else {
                        digits[digitsNum++] = atof(digit);
                        memset(digit, '\0', sizeof(digit));
                    }
                    digitNum = 0;
                    operator[optNum++] = *p;
                }
                break;

            case '(': {
                char *pointer_son;
                int ExistEnd = 0;
                pointer_son = ++p;
                while(length--) {
                    if ('(' == *p) {
                        ExistEnd--;
                    } else if (')' == *p) {
                        ExistEnd++;
                    }
                    if (1 == ExistEnd) {
                        break;
                    }
                    p++;
                }
                Result result_son = [self CalculateFor:pointer_son andLen:p - pointer_son];
                if (CALCULATE_ERR == result_son.error) {
                    result.error = result_son.error;
                    return result;
                }
                digits[digitsNum++] = result_son.value;
                memset(digit, 0, sizeof(digit));
                digitNum = -1;
                break;
            }
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
            case '.':
                digit[digitNum++] = *p;
                if (numberOfDots == 0 && *p == '.') {
                    numberOfDots = 1;
                } else if (numberOfDots == 1 && *p == '.') {
                    result.error = CALCULATE_ERR;
                    return result;
                }
                break;

            default:
                result.error = CALCULATE_ERR;
                return result;

        }
        if (0 == length && 0 < digitNum) {
            digits[digitsNum++] = atof(digit);
            memset(digit, 0, sizeof(digit));
            digitNum = 0;
        }
        p ++;
    }
    if (digitsNum != optNum + 1) {
        result.error = CALCULATE_ERR;
        return result;
    }
    for (index = 0; index < optNum; index ++) {
        if ('*' == operator[index]) {
            digits[index + 1] = digits[index] * digits[index + 1];
            digits[index] = 0;
            operator[index] = '?';
        } else if ('/' == operator[index]) {
            if (digits[index + 1] == 0) {
                result.error = CALCULATE_ERR;
                return result;
            }
            digits[index + 1] = digits[index] / digits[index + 1];
            digits[index] = 0;
            operator[index] = '?';
        }
    }
    for (index = 0; index < optNum; index ++) {
        if ('?' == operator[index]) {
            if (0 == index) {
                operator[index] = '+';
            } else {
                operator[index] = operator[index - 1];
            }
        }
    }
    result.value = digits[0];
    for (index = 0; index < optNum; index ++) {
        if ('+' == operator[index]) {
            result.value += digits[index + 1];
        } else if ('-' == operator[index]) {
            result.value -= digits[index + 1];
        }
    }
    return result;
}

相关文章

猜您喜欢

  • javascript动态生成表格 javascript动态生成表格详解

    想了解javascript动态生成表格详解的相关内容吗,莎蛋蛋的盖世英雄啊在本文为您仔细讲解javascript动态生成表格的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:JavaScript表格,JavaScript生成表格,下面大家一起来学习吧。..
  • android活动转盘 android实现简单的活动转盘

    想了解android实现简单的活动转盘的相关内容吗,勿安欧在本文为您仔细讲解android活动转盘的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:android,活动转盘,下面大家一起来学习吧。..

网友评论

Copyright 2020 www.freemmogames.net 【漫漫下载站】 版权所有 软件发布

声明:所有软件和文章来自软件开发商或者作者 如有异议 请与本站联系 点此查看联系方式