纯代码实现人民币兑换美元
//
// ViewController.m
// 01-exchangeRate
//
// Created by 王军波 on 16/4/10.
// Copyright © 2016年 王军波. All rights reserved.
//
#define kScreenW [UIScreen mainScreen].bounds.size.width
#define kScreenH [UIScreen mainScreen].bounds.size.height
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic,weak) UITextField *number;
@property (nonatomic,weak) UILabel *result;
@end
@implementation ViewController
//view加载完后会自动执行
- (void)viewDidLoad {
[super viewDidLoad];
[self setupUI];
// Do any additional setup after loading the view, typically from a nib.
}
#pragma mark - 分割线
//设置界面
- (void)setupUI{
//1.设置背景
UIImageView *bottomBackgroundPicture = [[UIImageView alloc]init];
UIImageView *topBackgroundPicture = [[UIImageView alloc]init];
//1.1上下覆盖灰色背景
//1.1.1灰色背景的尺寸大小
bottomBackgroundPicture.frame = CGRectMake(0, 290, self.view.frame.size.width, self.view.frame.size.height);
topBackgroundPicture.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height*0.03);
//1.1.2灰色背景的颜色设置
bottomBackgroundPicture.backgroundColor = [UIColor grayColor];
topBackgroundPicture.backgroundColor = [UIColor grayColor];
//2.添加到根视图
[self.view addSubview:bottomBackgroundPicture];
[self.view addSubview:topBackgroundPicture];
//3.设置国旗
//3.1两个相框
UIImageView *chinaPicture = [[UIImageView alloc]initWithFrame:CGRectMake(10, 30, 180, 130)];
UIImageView *americanPicture = [[UIImageView alloc]initWithFrame:CGRectMake(10,150 , 180, 130)];
//3.2将照片放到相框中
chinaPicture.image = [UIImage imageNamed:@"China"];
americanPicture.image = [UIImage imageNamed:@"USA"];
//添加到根视图
[self.view addSubview:chinaPicture];
[self.view addSubview:americanPicture];
//4.输入框
UITextField *numText = [[UITextField alloc]initWithFrame:CGRectMake(250, 50, 160, 80)];
//框内的光标在最右边
numText.textAlignment=NSTextAlignmentRight;
//给框设置一个纯数字键盘
numText.keyboardType = UIKeyboardTypeNumberPad;
//[numText sizeToFit];
//4.1输入框的背景颜色
//numText.backgroundColor = [UIColor grayColor];
//添加到根视图
[self.view addSubview:numText];
//赋给全局变量 用以下面换算方法的计算使用
_number = numText;
//创建3个Label
UILabel *num1Label = [[UILabel alloc]initWithFrame:CGRectMake(250, 200, 150, 30)];
UILabel *num2Label = [[UILabel alloc]initWithFrame:CGRectMake(60, 300, 300, 30)];
UILabel *num3Label = [[UILabel alloc]initWithFrame:CGRectMake(45, 330, 350, 30)];
//没啥用 测试
//num1Label.highlightedTextColor = [UIColor redColor];
num1Label.text = @"这里显示结果";
num2Label.text = @"1美元 = 6.4761人民币,更新于2016-4-6";
num3Label.text = @"数据仅供参考,交易时以银行柜台成交价为准";
//num1Label.backgroundColor = [UIColor grayColor];
//num2Label.backgroundColor = [UIColor redColor];
// 用以下面 计算使用
_result = num1Label;
//添加到根视图
[self.view addSubview:num1Label];
[self.view addSubview:num2Label];
[self.view addSubview:num3Label];
//5.按钮
UIButton *calculate = [[UIButton alloc]initWithFrame:CGRectMake(80, 370, 250, 50)];
//5.1默认状态字的颜色
[calculate setTitle:@"计算" forState:UIControlStateNormal];
[calculate setTitleColor:[UIColor colorWithRed:0 green:0 blue:90 alpha:5] forState:UIControlStateNormal];
//5.2高亮状态
[calculate setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
//5.3底色
calculate.backgroundColor = [UIColor colorWithRed:0 green:30 blue:70 alpha:20];
[self.view addSubview:calculate];
//6.触发事件的实现
[calculate addTarget:self action:@selector(calculate) forControlEvents:UIControlEventTouchUpInside];
}
//7.汇率换算计算的实现
- (void)calculate{
double numRate = 6.4761;
float rmb = _number.text.floatValue;
float dollar = rmb/numRate;
//dollar是float类型,将dollar转成string类型,包装成一个NSNumber的对象,对象的description方法以string形式打出来
_result.text = @(dollar).description;
//或者格式化获取string
//_result.text = [NSString stringWithFormat:@"%f",dollar];
}
@end
