［iOS开发日记］简易计算器

#import <UIKit/UIKit.h>@interface ViewController : UIViewController{    UILabel *_label;//显示框    int     a;//数字的tag    int     b;//运算符的tag    float     result;//结果    BOOL    flag;//判断是非按等号}@end

  1 #import "ViewController.h"  2 #define HEIGHT     [[UIScreen mainScreen] bounds].size.height  3 #define WIDTH      [[UIScreen mainScreen] bounds].size.width  4 @interface ViewController ()  5   6 @end  7   8 @implementation ViewController  9  10 - (void)viewDidLoad { 11     [super viewDidLoad]; 12     [self creat]; 13     // Do any additional setup after loading the view, typically from a nib. 14 } 15 - (void)creat{ 16     UIImage *num001 = [UIImage imageNamed:@"001.png"]; 17     UIImage *num002 = [UIImage imageNamed:@"002.png"]; 18     UIImage *num101 = [UIImage imageNamed:@"101.png"]; 19     UIImage *num102 = [UIImage imageNamed:@"102.png"]; 20     UIImage *num201 = [UIImage imageNamed:@"201.png"]; 21     UIImage *num202 = [UIImage imageNamed:@"202.png"]; 22     UIImage *num301 = [UIImage imageNamed:@"301.png"]; 23     UIImage *num302 = [UIImage imageNamed:@"302.png"]; 24     UIImage *num401 = [UIImage imageNamed:@"401.png"]; 25     UIImage *num402 = [UIImage imageNamed:@"402.png"]; 26     UIImage *num501 = [UIImage imageNamed:@"501.png"]; 27     UIImage *num502 = [UIImage imageNamed:@"502.png"]; 28     UIImage *num601 = [UIImage imageNamed:@"601.png"]; 29     UIImage *num602 = [UIImage imageNamed:@"602.png"]; 30     UIImage *num701 = [UIImage imageNamed:@"701.png"]; 31     UIImage *num702 = [UIImage imageNamed:@"702.png"]; 32     UIImage *num801 = [UIImage imageNamed:@"801.png"]; 33     UIImage *num802 = [UIImage imageNamed:@"801.png"]; 34     UIImage *num901 = [UIImage imageNamed:@"901.png"]; 35     UIImage *num902 = [UIImage imageNamed:@"902.png"]; 36      37      38     UIImage *calj01 = [UIImage imageNamed:@"j01.png"]; 39     UIImage *calj02 = [UIImage imageNamed:@"j02.png"]; 40     UIImage *caljj01 = [UIImage imageNamed:@"jj01.png"]; 41     UIImage *caljj02 = [UIImage imageNamed:@"jj02.png"]; 42     UIImage *calc01 = [UIImage imageNamed:@"c01.png"]; 43     UIImage *calc02 = [UIImage imageNamed:@"c02.png"]; 44     UIImage *calcc01 = [UIImage imageNamed:@"cc01.png"]; 45     UIImage *calcc02 = [UIImage imageNamed:@"cc02.png"]; 46     UIImage *cald01 = [UIImage imageNamed:@"d01.png"]; 47     UIImage *cald02 = [UIImage imageNamed:@"d02.png"]; 48     UIImage *caldd = [UIImage imageNamed:@"dd01.png"]; 49      50      51      52      53     self.view.backgroundColor = [UIColor whiteColor]; 54     _label = [[UILabel alloc]initWithFrame:CGRectMake(20, 40, WIDTH - 40, 80)]; 55     _label.backgroundColor = [UIColor blackColor]; 56     _label.textColor = [UIColor whiteColor]; 57     _label.textAlignment = NSTextAlignmentRight; 58     _label.font = [UIFont systemFontOfSize:30]; 59     _label.lineBreakMode = NSLineBreakByTruncatingHead; 60     _label.text = @"0"; 61     [self.view addSubview:_label]; 62      63     UIButton *clearBtn = [[UIButton alloc]initWithFrame:CGRectMake(20, 130, (WIDTH-55)/4, (WIDTH-55)/4)]; 64     [clearBtn setTitle:@"C" forState:UIControlStateNormal]; 65  66     [clearBtn setImage:[UIImage imageNamed:@"ccc01.png"] forState:UIControlStateNormal]; 67     clearBtn.tag = 1; 68     [clearBtn addTarget:self action:@selector(deleteInfo:) forControlEvents:UIControlEventTouchUpInside]; 69     [self.view addSubview:clearBtn]; 70      71     UIButton *deleteBtn = [[UIButton alloc]initWithFrame:CGRectMake(WIDTH-100, 130, (WIDTH-55)/4, (WIDTH-55)/4)]; 72     deleteBtn.tag = 2; 73     [deleteBtn setTitle:@"<-" forState:UIControlStateNormal]; 74  75     [deleteBtn setImage:[UIImage imageNamed:@"t02.png"] forState:UIControlStateNormal]; 76     [deleteBtn setImage:[UIImage imageNamed:@"t01.png"] forState:UIControlStateHighlighted]; 77     [deleteBtn addTarget:self action:@selector(deleteInfo:) forControlEvents:UIControlEventTouchUpInside]; 78     [self.view addSubview:deleteBtn]; 79     NSArray *arr = [NSArray arrayWithObjects:@"1",@"2",@"3",@"+",@"4",@"5",@"6",@"-",@"7",@"8",@"9",@"x",@".",@"0",@"=",@"/", nil]; 80     NSArray *back01 = @[num101,num201,num301,calj02,num401,num501,num601,caljj02,num701,num801,num901,calc02,caldd,num001,cald02,calcc02]; 81     NSArray *back02 = @[num102,num202,num302,calj01,num402,num502,num602,caljj01,num702,num802,num902,calc01,caldd,num002,cald01,calcc01]; 82     for (int i = 0; i< arr.count; i++) { 83         UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(20+i%4*((WIDTH-55)/4 + 5), 220+i/4 * ((WIDTH-55)/4 +5), (WIDTH-55)/4, (WIDTH-55)/4)]; 84         btn.tag = i+1; 85         [btn setImage:[back01 objectAtIndex:i] forState:UIControlStateNormal]; 86         [btn setImage:[back02 objectAtIndex:i] forState:UIControlStateHighlighted]; 87         [btn setTitle:[arr objectAtIndex:i] forState:UIControlStateNormal]; 88         [btn addTarget:self action:@selector(manage:) forControlEvents:UIControlEventTouchUpInside]; 89         [self.view addSubview:btn]; 90          91     } 92     flag = NO; 93     a = 0; 94 } 95 -(void)deleteInfo:(UIButton *)btn{ 96     if (btn.tag == 1) { 97         _label.text = @"0"; 98         a = 0; 99     }else{100         if (_label.text.length == 1) {101             _label.text = @"0";102             return;103         }104         _label.text = [_label.text substringToIndex:_label.text.length-1];105     }106 }107 -(void)manage:(UIButton *)btn{108     if (btn.tag%4 == 0||btn.tag == 15) {109         flag = YES;110         b = a;111         a = (int)btn.tag;112         //  NSLog(@"%f",b);113         if (b == 0) {114             result = [_label.text floatValue];115         }else{116             switch (b/4) {117                 case 1:118                     result  += [_label.text floatValue];119                     break;120                 case 2:121                     result  -= [_label.text floatValue];122                     break;123                 case 3:124                     result  *= [_label.text floatValue];125                     break;126                 case 4:127                     result  /= [_label.text floatValue];128                     break;                default:129                     130                     break;131             }132             133         }134         if (result > (int)result) {135             _label.text = [NSString stringWithFormat:@"%.2f",result];136         }else{137             _label.text = [NSString stringWithFormat:@"%d",(int)result];138         }139         if (btn.tag == 15) {140             result = 0;141             a = 0;142         }143         144     }else if(btn.tag != 13){145         if ([_label.text isEqualToString:@"0"]) {146             _label.text = @"";147         }148         if (flag == YES) {149             flag = NO;150             _label.text = @"";151         }152         if (btn.tag == 14) {153             _label.text = [_label.text stringByAppendingString:@"0"];154         }else{155             _label.text = [_label.text stringByAppendingFormat:@"%zi",btn.tag - btn.tag/4];156         }157     }else{158         NSRange range = [_label.text rangeOfString:@"."];159         if (range.location == NSNotFound) {160             _label.text = [_label.text stringByAppendingString:@"."];161         }162     }163 }164 - (void)didReceiveMemoryWarning {165     [super didReceiveMemoryWarning];166     // Dispose of any resources that can be recreated.167 }168 169 @end