简要说明：
该计算器可以实现多位数的加减乘除，还可以连加减。不能实现算术的优先级，若有好的想法，可以告知一二。
#import "AppDelegate.h"
#import "ViewController.h"
@interfaceAppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window=[[UIWindow alloc]init];
self.window.frame=[[UIScreenmainScreen]bounds];
[self.windowmakeKeyAndVisible];
ViewController *vc=[[ViewControlleralloc]init];
self.window.rootViewController=vc;
returnYES;
}
#import "ViewController.h"
@interfaceViewController ()
{
UIButton *button;
UILabel *label;
UILabel *label1;
}
@end
@implementation ViewController
int k;
- (void)viewDidLoad {
[superviewDidLoad];
[self.viewsetBackgroundColor:[UIColorcolorWithPatternImage:[UIImageimageNamed:@"3.jpg"]]];
label=[[UILabelalloc]init];
label.frame=CGRectMake(140, 30, 90, 60);
label.text=@"计算器";
label.textColor=[UIColorredColor];
label.font=[UIFontsystemFontOfSize:30];
[self.viewaddSubview:label];
label1=[[UILabelalloc]init];
label1.backgroundColor=[UIColorwhiteColor];
label1.frame=CGRectMake(0, 120, 375, 90);
label1.textAlignment=NSTextAlignmentRight;
[self.viewaddSubview:label1];
NSArray *arr=@[@"sin",@"cos",@"tan",@"/",@"7",@"8",@"9",@"*",@"4",@"5",@"6",@"-",@"1",@"2",@"3",@"+",@"c",@"0",@".",@"="];
for (int i=0; i<5; i++) {
for (int j=0; j<4; j++) {
button=[UIButtonbuttonWithType:UIButtonTypeCustom];
button.frame=CGRectMake(13+j*90, 275+i*80, 80, 70);
button.backgroundColor=[UIColorblueColor];
button.titleLabel.font=[UIFontsystemFontOfSize:30];
[buttonsetTitle:arr[k++] forState:UIControlStateNormal];
[buttonaddTarget:selfaction:@selector(event:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
}
k=0;
}
-(void) event:(UIButton *) btn
{
static NSString *str=@"";//接收数据
static NSString *str1=@"";//用于当前显示
static CGFloat number,result_v=0;;//最终的处理数据
static CGFloat num[20]={0,0,0,0,0,0,0,0,0,0,0,0};//存放数据
static int n=0;//数字数组下标
static NSString *result=@"";//运算结果
staticint i,sign=1;//符号标志位sign=1做加法运算，sign=-1做减法运算，sign=2做乘法运算，sign=3做除法运算
str=btn.titleLabel.text;
if([str hasSuffix:@"0"]||[str hasSuffix:@"1"]||[str hasSuffix:@"2"]||[str hasSuffix:@"3"]||[str hasSuffix:@"4"]||[str hasSuffix:@"5"]||[str hasSuffix:@"6"]||[str hasSuffix:@"7"]||[str hasSuffix:@"8"]||[str hasSuffix:@"9"]||[str hasSuffix:@"."]){
{if ([str hasSuffix:@"."]) {
i=1;
}
number=number*10+[str floatValue];
if (i==1) {
number=number/10;
}
}
}
elseif(![str hasSuffix:@"c"])//判断是否为运算符,且不为清除符
{ i=0;
num[n++] = number;//将从Button获得的数据进行存储
number=0;//取完数把数据清零
/*****************数据处理******************/
if(sign==1||sign==-1)
result_v += num[n-1]*sign;//进行加减运算，并存储结果
else if(sign==2)
result_v *= num[n-1]; //进行乘运算，并存储结果
else if(sign==3)
result_v /= num[n-1]; //进行除运算，并存储结果
if([str hasSuffix:@"+"])
sign=1;
else if([str hasSuffix:@"-"])
sign=-1;
else if([str hasSuffix:@"*"])
sign=2;
else if([str hasSuffix:@"/"])
sign=3;
/*****************数据处理******************/
else if([str hasSuffix:@"="])
{
result = [NSString stringWithFormat:@"%g",result_v];//将计算结果转化为NSString类型，便于显示
NSLog(@"result_v=%g",result_v);
result_v = 0;//得出结果后对结果存储变量清零
}
}
if ([str hasSuffix:@"c"]) //撤销上一步的计算操作，再执行计算
{
str1=@"";
str=@"";
result=@"";
}
str1 = [NSString stringWithFormat:@"%@%@%@",str1,str,result];//粘帖字符串
label1.text = str1;//送显示
result = @"";//每次给结果字符串清零以免被粘帖
}