第一个实例：Draw

来源：互联网发布：mac快传编辑：程序博客网时间：2024/05/16 08:13

从2015年12月29日开始为一直在看OC的语法教程，希望在最短时间里先对语法进行学习，随后也跟着GitHub上的一个教程学做了一个app，一个打靶的小游戏。做完这个app以后为想完全自己动手写一个app，然后就有了这个叫Draw其实就是一个抽奖的app。

其实这个app功能挺简单，就是点击“开始抽奖”上方数字开始滚动，点击“停止”就会停止数字滚动，然后当前的数字就会被记录下来，当然也可以设置抽奖范围，因为默认的抽奖范围是1-500，基本功能就是这些，本来还想再设计一个一次抽奖人数，比如抽一次就出来五个数字这样的，可是能力有限暂时有点困难，等以后再完善吧。

这个app是用storyboard做的，因为是单页面嘛比较简单一点。

下面是代码：

ViewController.h

#import <UIKit/UIKit.h>@interface ViewController : UIViewController- (IBAction)beginDraw:(UIButton *)sender;//开始抽奖按钮- (IBAction)stopRoll:(UIButton *)sender;//停止抽奖按钮- (IBAction)cleanAll:(UIButton *)sender;//清空按钮- (IBAction)setButton:(UIButton *)sender;//设置按钮@property (weak, nonatomic) IBOutlet UILabel *rollLabel;//滚动显示区@property (weak, nonatomic) IBOutlet UILabel *showLabel;//中奖显示区@property (strong, nonatomic) IBOutlet UITextView *showNumber;//所有中奖显示区@property (weak, nonatomic) IBOutlet UITextField *rangeField;//抽奖人数输入框- (void)updateLabel;//更新Label文字- (void)rollshow;//滚动显示- (void)startAgain;//重新开始- (void)randomNumber;//生成随机数-(void)viewTapped:(UITapGestureRecognizer*)tapGr;//键盘隐藏- (void)timerAction:(NSTimer *)timer;//定时器@end

ViewController.m

#import "ViewController.h"@interface ViewController () {    NSInteger randomValue;    NSTimer *myTimer;    NSInteger showValue;    NSMutableString *allNumber;    NSInteger randomRange;}@end@implementation ViewController//生成随机数方法- (void)randomNumber {    if (randomRange == 0) {        randomValue = (arc4random() % 500) + 1;    }else {        randomValue = (arc4random() % randomRange) + 1;    }  }//更新Label文字的方法- (void)updateLabel {    self.rollLabel.text = [NSString stringWithFormat:@"%ld",randomValue];    self.showLabel.text = [NSString stringWithFormat:@"%ld",showValue];    self.showNumber.text = [NSString stringWithFormat:@"%@",allNumber];}//滚动显示方法- (void)rollshow {    int i = 0.1;    if (![myTimer isValid]) {        myTimer = [NSTimer scheduledTimerWithTimeInterval:i                                                   target:self                                                 selector:@selector(timerAction:)                                                 userInfo:nil                                                  repeats:YES];    }}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    if (allNumber == nil) {        allNumber = [NSMutableString stringWithFormat:@"本次中奖号码:"];    }    [self updateLabel];        // 创建自定义的触摸手势来实现对键盘的隐藏    UITapGestureRecognizer *tapGr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];    tapGr.cancelsTouchesInView = NO;    [self.view addGestureRecognizer:tapGr];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}//重新开始方法- (void)startAgain {    randomValue = 0;    showValue = 0;    allNumber = [NSMutableString stringWithFormat:@"本次中奖号码:"];    self.rangeField.text = nil;    [self updateLabel];}//开始抽奖按钮的方法- (IBAction)beginDraw:(UIButton *)sender {    [self rollshow];}//停止抽奖按钮的方法- (IBAction)stopRoll:(UIButton *)sender {    //先判断定时器是否在运行    if ([myTimer isValid]) {        [myTimer invalidate];//关闭定时器        myTimer = nil;//释放myTimer对象               //拼接字符串，将产生的中奖号码进行拼接        allNumber = [NSMutableString stringWithFormat:@"%@ %ld",allNumber,randomValue];    }    showValue = randomValue;    [self updateLabel];  }//定时器的方法- (void)timerAction:(NSTimer *)timer {    [self randomNumber];    [self updateLabel];}//清除按钮的方法- (IBAction)cleanAll:(UIButton *)sender {    //提示框    NSString *title = @"清除数据";    NSString *message = @"注意！清除数据后中奖号码将无法恢复！";    NSString *cancelButtonTitle = NSLocalizedString(@"取消", nil);    NSString *otherButtonTitle = NSLocalizedString(@"确定", nil);    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title                                                                             message:message                                                                      preferredStyle:UIAlertControllerStyleAlert];    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle                                                           style:UIAlertActionStyleCancel                                                         handler:^(UIAlertAction *action) {}];    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle                                                          style:UIAlertActionStyleDefault                                                        handler:^(UIAlertAction *action) {                                                            [self startAgain];                                                        }];    [alertController addAction:cancelAction];    [alertController addAction:otherAction];    [self presentViewController:alertController animated:YES completion:nil];    }//设置按钮的方法- (IBAction)setButton:(UIButton *)sender {    //设置一个临时变量    NSInteger rangeNow = [self.rangeField.text integerValue];    if (rangeNow > 1) {        randomRange = rangeNow;        //提示框        NSString *title = @"设置成功";        NSInteger range = [self.rangeField.text integerValue];        NSString *message = [NSString stringWithFormat:@"您已经成功将抽奖人数设置为%ld人！",range];        NSString *otherButtonTitle = NSLocalizedString(@"确定", nil);        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title                                                                                 message:message                                                                          preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle                                                              style:UIAlertActionStyleDefault                                                            handler:^(UIAlertAction *action) {                                                                self.rangeField.text = nil;                                                            }];        [alertController addAction:otherAction];        [self presentViewController:alertController animated:YES completion:nil];    }else if (rangeNow <= 1) {        //提示框        NSString *title = @"提示";        NSString *message = @"大哥，请确认人数以后再输入！\n抽奖人数要大于1人！！！";        NSString *otherButtonTitle = NSLocalizedString(@"确定", nil);        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title                                                                                 message:message                                                                          preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle                                                              style:UIAlertActionStyleDefault                                                            handler:^(UIAlertAction *action) {                                                                self.rangeField.text = nil;                                                            }];        [alertController addAction:otherAction];        [self presentViewController:alertController animated:YES completion:nil];    }}//键盘隐藏的方法-(void)viewTapped:(UITapGestureRecognizer*)tapGr{    [self.rangeField resignFirstResponder];}@end

第二个界面（纯粹为了学习做第二个界面才做的）

SetViewController.h

#import <UIKit/UIKit.h>@interface SetViewController : UIViewController- (IBAction)backButton:(UIButton *)sender;//返回按钮@end

SetViewController.m

#import "SetViewController.h"@interface SetViewController ()@end@implementation SetViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (IBAction)backButton:(UIButton *)sender {    [self dismissViewControllerAnimated:YES completion:^{}];}@end

主要学到的地方为：

定时器的创建和实用

myTimer = [NSTimer scheduledTimerWithTimeInterval:i                                           target:self                                         selector:@selector(timerAction:)                                         userInfo:nil                                          repeats:YES];

<pre name="code" class="objc">//定时器的方法- (void)timerAction:(NSTimer *)timer {    [self randomNumber];    [self updateLabel];}

判断定时器是否停止，以及停止定时器

    if ([myTimer isValid]) {        [myTimer invalidate];//关闭定时器        myTimer = nil;//释放myTimer对象    }

警告提示框的实用

    //提示框    NSString *title = @"清除数据";    NSString *message = @"注意！清除数据后中奖号码将无法恢复！";    NSString *cancelButtonTitle = NSLocalizedString(@"取消", nil);    NSString *otherButtonTitle = NSLocalizedString(@"确定", nil);    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title                                                                             message:message                                                                      preferredStyle:UIAlertControllerStyleAlert];    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle                                                           style:UIAlertActionStyleCancel                                                         handler:^(UIAlertAction *action) {}];    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle                                                          style:UIAlertActionStyleDefault                                                        handler:^(UIAlertAction *action) {                                                            [self startAgain];                                                        }];    [alertController addAction:cancelAction];    [alertController addAction:otherAction];    [self presentViewController:alertController animated:YES completion:nil];

创建自定义手势来隐藏键盘

    UITapGestureRecognizer *tapGr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];    tapGr.cancelsTouchesInView = NO;    [self.view addGestureRecognizer:tapGr];

<pre name="code" class="objc">//键盘隐藏的方法-(void)viewTapped:(UITapGestureRecognizer*)tapGr{    [self.rangeField resignFirstResponder];}

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