UI 纯代码实现计算器

//  MHTAppDelegate.h

//  TestCa

//  Copyright (c) 2014年 Summer. All rights reserved.

#import
<UIKit/UIKit.h>

@interface MHTAppDelegate :
UIResponder <UIApplicationDelegate,UITextFieldDelegate>

@property (retain,
nonatomic) UIWindow *window;

@end

//  MHTAppDelegate.m

//  TestCal

//  Copyright (c) 2014年 Summer. All rights reserved.

#import
"MHTAppDelegate.h"

@interface
MHTAppDelegate()

{

UIView *_containerView;

UIButton *_desBut1;

UIButton *_desBut2;

UIButton *_desBut3;

UIButton *_desBut4;

UILabel *_hintLine;

UITextField *_textField;

BOOL  _isHave;

BOOL _isResult;

}

@property (retain,
nonatomic) NSString *_str;

@property (retain,
nonatomic) NSString *_number;

@end

@implementation MHTAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary
*)launchOptions

{

self.window = [[UIWindow
alloc] initWithFrame:[[UIScreen
mainScreen] bounds]];

// Override point for customization after application launch.

//创建底层的背景视图

_containerView = [[UIView
alloc] initWithFrame:CGRectMake(0,
0, 320,
568)];

_containerView.backgroundColor = [UIColor
whiteColor];

[self.window
addSubview:_containerView];

[_containerView
release];

//baseCalculate

[self
baseCalculate];

//Line

[self
line];

_isHave = NO;

_isResult = NO;

self.window.backgroundColor = [UIColor
whiteColor];

[self.window
makeKeyAndVisible];

return YES;

}

- (void)baseCalculate

{int j =
0;

NSArray *calArr =@[@"C",
@"+/-", @"%", @"÷",
@"7", @"8", @"9",
@"x", @"4", @"5",
@"6", @"-", @"1",
@"2", @"3", @"+",
@"0", @".", @"="];

NSInteger n = 0;

for (int i = 0; i <
5; i++) {

for ( j = 0; j <
4; j++) {

if (i == 4 && j ==
0) {

_desBut1 = [UIButton
buttonWithType:UIButtonTypeSystem];

_desBut1.frame =
CGRectMake(0, 488,
160, 80);

[_desBut1
setTitle:calArr[n] forState:UIControlStateNormal];

[_desBut1
setTitleColor:[UIColor
blackColor] forState:UIControlStateNormal];

[_desBut1
addTarget:self
action:@selector(numberClick:)
forControlEvents:UIControlEventTouchUpInside];

_desBut1.titleLabel.font = [UIFont
fontWithName:@"AppleSDGothicNeo-Thin"
size:30];

_desBut1.backgroundColor = [UIColor
whiteColor];

[_containerView
addSubview:_desBut1];

j =
2;

n++;

}

_desBut1 = [UIButton
buttonWithType:UIButtonTypeSystem];

_desBut1.frame =
CGRectMake(0 + j * 80,
168 + 80 * i, 80,
80);

[_desBut1
setTitle:calArr[n] forState:UIControlStateNormal];

[_desBut1
setTitleColor:[UIColor
blackColor] forState:UIControlStateNormal];

if (j == 3) {

_desBut1.backgroundColor = [UIColor
orangeColor];

_desBut1.titleLabel.font = [UIFont
fontWithName:@"AppleSDGothicNeo-Thin"
size:30];

}else
if (i == 0){

_desBut1.backgroundColor = [UIColor
lightGrayColor];

}
else

{

_desBut1.backgroundColor = [UIColor
whiteColor];

}

_desBut1.titleLabel.font = [UIFont
fontWithName:@"AppleSDGothicNeo-Thin"
size:30];

[_containerView
addSubview:_desBut1];

if (n == 4 || n ==
5 || n == 6 || n == 8 || n ==
9 || n == 10 || n ==
12 || n == 13 || n == 14 || n ==
17 || n == 16) {

[_desBut1
addTarget:self
action:@selector(numberClick:)
forControlEvents:UIControlEventTouchUpInside];

}

if (n == 0) {

[_desBut1
addTarget:self
action:@selector(clearClick:)
forControlEvents:UIControlEventTouchUpInside];

}

if (n == 1) {

[_desBut1
addTarget:self
action:@selector(oppositeClick:)
forControlEvents:UIControlEventTouchUpInside];

}

if (n == 2) {

[_desBut1
addTarget:self
action:@selector(percentClick:)
forControlEvents:UIControlEventTouchUpInside];

}

if (n == 3 || n ==
7 || n == 11 || n == 15 || n ==
14) {

[_desBut1
addTarget:self
action:@selector(operationClick:)
forControlEvents:UIControlEventTouchUpInside];

}

if (n == 18) {

[_desBut1
addTarget:self
action:@selector(resultClick:)
forControlEvents:UIControlEventTouchUpInside];

}

n++;

}

j =
0;

}

NSLog(@"test:%d", n);

[self
displayTextField];

}

- (void)displayTextField

{

_textField = [[UITextField
alloc] initWithFrame:CGRectMake(0,
40, 320,
128)];

_textField.backgroundColor = [UIColor
blackColor];

_textField.text =
@"0";

//不可写

_textField.enabled =
NO;

_textField.delegate =
self;

_textField.textColor = [UIColor
whiteColor];

_textField.font = [UIFont
fontWithName:@"AppleSDGothicNeo-Thin"
size:40];

_textField.textAlignment =
NSTextAlignmentRight;

[_containerView
addSubview:_textField];

[_textField
release];

}

- (void)oppositeClick:(UIButton *)oppositeBut

{

CGFloat num = [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g", (-num)];

}

- (void)percentClick:(UIButton *)percentBut

{

CGFloat num = [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g", (num /
100)];

}

- (void)clearClick:(UIButton *)clearBut

{

_textField.text =
nil;

}

- (void)numberClick:(UIButton *)numBut

{

if ( _isHave || [_textField.text
isEqualToString:@"0"] ||
_isResult ) {

_textField.text =
@"";

_textField.text =  [_textField.text
stringByAppendingString:numBut.currentTitle];

}else{

_textField.text =  [_textField.text
stringByAppendingString:numBut.currentTitle];

}

_isHave = NO;

_isResult = NO;

}

- (void)operationClick:(UIButton *)operationBut

{

if ([operationBut.currentTitle
isEqualToString:@"+"]) {

self._str = [_textField.text
stringByAppendingString:@"+"];

_isHave = YES;

}
else if  ([operationBut.currentTitle
isEqualToString:@"-"]) {

self._str = [_textField.text
stringByAppendingString:@"-"];

_isHave = YES;

}
else if ([operationBut.currentTitle
isEqualToString:@"x"]) {

self._str = [_textField.text
stringByAppendingString:@"x"];

_isHave = YES;

}else
if ([operationBut.currentTitle
isEqualToString:@"÷"]) {

self._str = [_textField.text
stringByAppendingString:@"÷"];

_isHave = YES;

}

}

- (void)resultClick:(UIButton *)resultBut

{

NSLog(@"aa");

if ([self._str
hasSuffix:@"+"]) {

CGFloat value1 = [self._str
floatValue];

CGFloat value2 =  [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g",(value1 + value2)];

self._str = @"";

_isResult = YES;

}else
if ([self._str
hasSuffix:@"-"]){

CGFloat value1 = [self._str
floatValue];

CGFloat value2 =  [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g",(value1 - value2)];

self._str = @"";

_isResult = YES;

}else
if([self._str
hasSuffix:@"x"]){

CGFloat value1 = [self._str
floatValue];

CGFloat value2 =  [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g",(value1 * value2)];

self._str = @"";

_isResult = YES;

}
else if([self._str
hasSuffix:@"÷"]){

CGFloat value1 = [self._str
floatValue];

CGFloat value2 =  [_textField.text
floatValue];

_textField.text = [NSString
stringWithFormat:@"%g",(value1 / value2)];

self._str = @"";

_isResult = YES;

}else{

self._str = @"";

_isResult = YES;

}

}

//收回键盘

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

return YES;

}

// Line

- (void)line

{

//Line

for (int i = 0; i <
4; i++) {

UILabel *hintLine = [[UILabel
alloc] initWithFrame:CGRectMake(0,
248 + 80 * i, 320,
0.5)];

hintLine.backgroundColor = [UIColor
blackColor];

[_containerView
addSubview:hintLine];

[hintLine
release];

}

//Line

for (int i = 0; i <
3; i++) {

if (i == 0) {

_hintLine = [[UILabel
alloc] initWithFrame:CGRectMake(80,
168, 0.5, 320)];

_hintLine.backgroundColor = [UIColor
blackColor];

[_containerView
addSubview:_hintLine];

[_hintLine
release];

}else{

_hintLine = [[UILabel
alloc] initWithFrame:CGRectMake(80 + i  *
80, 168, 0.5,
400)];

_hintLine.backgroundColor = [UIColor
blackColor];

[_containerView
addSubview:_hintLine];

[_hintLine
release];

}

}

}

- (void)applicationWillResignActive:(UIApplication *)application

{

// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition
to the background state.

// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{

// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.

// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

}

- (void)applicationWillEnterForeground:(UIApplication *)application

{

// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

}

- (void)applicationWillTerminate:(UIApplication *)application

{

// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

}

- (void)dealloc

{

[_window
release];

[super
dealloc];

}

@end