标签：计算器
#import "AppDelegate.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIView *containerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];
containerView.backgroundColor = [UIColor blackColor];
[self.window addSubview:containerView];
[containerView release];
self.currentFirst = @"";
//显示数字
self.display = [[UILabel alloc]initWithFrame:CGRectMake(0, 80, 320, 63)];
self.display.backgroundColor = [UIColor whiteColor];
[containerView addSubview:self.display];
[self.display release];
self.display.text = @"";
//回删键
UIButton *space = [UIButton buttonWithType:UIButtonTypeSystem];
space.frame = CGRectMake(0, 163, 235, 65);
space.backgroundColor = [UIColor grayColor];
space.layer.cornerRadius = 10;
[space setTitle:@"回删" forState:UIControlStateNormal];
[containerView addSubview:space];
[space addTarget:self action:@selector(deleteOne:) forControlEvents:UIControlEventTouchUpInside];
//删除键
UIButton *delete = [UIButton buttonWithType:UIButtonTypeSystem];
delete.frame = CGRectMake(255,163 , 65, 65);
delete.backgroundColor = [UIColor grayColor];
[delete setTitle:@"删除" forState:UIControlStateNormal];
delete.titleLabel.font = [UIFont systemFontOfSize:20];
delete.layer.cornerRadius = 10;
[containerView addSubview:delete];
[delete addTarget:self action:@selector(deletText:) forControlEvents:UIControlEventTouchUpInside];
NSArray * buttonDisplay = @[@"7",@"8",@"9",@"/",@"4",@"5",@"6",@"*",@"1",@"2",@"3",@"-",@".",@"0",@"=",@"+"];
int k = 0;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame = CGRectMake(85 * j, 248 + 85 * i, 65, 65);
self.button.backgroundColor = [UIColor grayColor];
self.button.layer.cornerRadius = 10;
self.button.layer.borderColor = [UIColor orangeColor].CGColor;
self.button.titleLabel.font = [UIFont systemFontOfSize:30];
[self.button setTitle:buttonDisplay[k] forState:UIControlStateNormal];
[containerView addSubview:self.button];
[self.button addTarget:self action:@selector(display:) forControlEvents:UIControlEventTouchUpInside];
[self.button addTarget:self action:@selector(currentSymbol:) forControlEvents:UIControlEventTouchUpInside];
[self.button addTarget:self action:@selector(calculate:) forControlEvents:UIControlEventTouchUpInside];
k++;
}
}
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
//获取当前值和前一个值
- (void)display:(UIButton *)button
{
NSArray *arry = @[@"7",@"8",@"9",@"4",@"5",@"6",@"1",@"2",@"3",@".",@"0"];
for (int i = 0; i < 11; i++) {
if ([button.titleLabel.text isEqualToString:@"." ]) {
if ([self.display.text length] == 0) {
self.display.text = [@"0" stringByAppendingString:button.titleLabel.text];
self.display.text = [self.display.text substringToIndex:[self.display.text length] - 1];
}else{
int k = 0;
for (int i = 0; i < [self.display.text length]; i++)
{
if ([self.display.text characterAtIndex:i] == ‘.‘) {
k++;
}
}
if (k > 0) {
;
}else{
self.display.text = [self.display.text stringByAppendingString:button.titleLabel.text];
}
}
}
else if ([self.display.text isEqualToString:@"0" ] && [button.titleLabel.text compare:@"."] != 0)
{
self.display.text = button.titleLabel.text;
self.display.text = [self.display.text substringToIndex:[self.display.text length] - 1];
}
else
{
if ([arry[i] isEqualToString:button.titleLabel.text ]) {
self.display.text = [self.display.text stringByAppendingString:button.titleLabel.text];
break;
}
}
}
}
//获取当前符号
- (void)currentSymbol:(UIButton *)button
{
NSArray *arry = @[@"+",@"-",@"*",@"/"];
for (int i = 0; i < 4; i++) {
if ([button.titleLabel.text isEqualToString:arry[i]]) {
self.currentSymbol = button.titleLabel.text;
self.currentSecond = self.display.text;
self.display.text = @"";
break;
}
}
}
//计算
-(void)calculate:(UIButton *)button
{
if ([button.titleLabel.text isEqualToString:@"="]) {
if ([self.currentSymbol isEqualToString:@"/"]) {
self.currentFirst = _display.text;
float a = [self.currentSecond floatValue] / [self.currentFirst floatValue];
self.display.text = [NSString stringWithFormat:@"%g",a];
}
else if ([self.currentSymbol isEqualToString:@"*"]) {
self.currentFirst = self.display.text;
double a = [self.currentSecond floatValue] * [self.currentFirst floatValue];
self.display.text = [NSString stringWithFormat:@"%g",a];
}
else if ([self.currentSymbol isEqualToString:@"-"]) {
self.currentFirst = _display.text;
float a = [self.currentSecond floatValue] - [self.currentFirst floatValue];
self.display.text = [NSString stringWithFormat:@"%g",a];
}
else if ([self.currentSymbol isEqualToString:@"+"]) {
self.currentFirst = self.display.text;
float a = [self.currentSecond floatValue] + [self.currentFirst floatValue];
self.display.text = [NSString stringWithFormat:@"%g",a];
}
}
}
//回删
- (void)deleteOne:(UIButton *)button
{
if ([self.display.text length] > 0) {
self.display.text = [self.display.text substringToIndex:[self.display.text length] - 1];
}
}
//删除
- (void)deletText:(UIButton *)button
{
self.display.text = @"";
}
标签：计算器
原文地址：http://blog.csdn.net/lixiaoshuai150/article/details/38795707
