实例iPhone编程入门教程-第十二天

来源：互联网发布：战斗机知乎编辑：程序博客网时间：2024/06/16 15:48

DAY TWELVE – Decide

今天来建立一个 iPhone app 软件，用你的iPhone 分歧解决器。

纲要：
- 在程序显示前运行代码 -
- 关于iPhone的“Utility Application” 运用 -
- Rand, Label, Button 代码运用 -

首先运行以安装好的 xCode

选择: File->New Project.

从 "New Project" 窗口

选择 : iPhone OS ->Applications-> Utility Application
命名 : 我这里命名为 “UDecide”

(1) 在xCode打开 MainView.h 文件,加入下面代码

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

@interface MainView : UIView {
IBOutlet UILabel *result;
}
- (IBAction)abcd;
- (IBAction)agreeDisagree;
- (IBAction)headsTails;
- (IBAction)leftCenterRight;
- (IBAction)lottery;
- (IBAction)oneToHundred;
- (IBAction)positiveNegative;
- (IBAction)russianRoulette;
- (IBAction)trueFalse;
- (IBAction)yesNo;
@end

(2) 在xCode打开 MainView.m 文件,加入下面代码

#import "MainView.h"

@implementation MainView

- (IBAction)abcd {
    int rNumber = rand() % 4; //计算几率: 四分之一

switch (rNumber) {
  case 0:
   result.text = @"A";
   break;
  case 1:
   result.text = @"B";
   break;
  case 2:
   result.text = @"C";
   break;
  case 3:
   result.text = @"D";
   break;
  default:
   break;
}
}

- (IBAction)agreeDisagree {
    int rNumber = rand() % 2;

switch (rNumber) {
  case 0:
   result.text = @"Agree";
   break;
  case 1:
   result.text = @"Disagree";
   break;
  default:
   break;
}
}

- (IBAction)headsTails {
int rNumber = rand() % 4;

switch (rNumber) {
  case 0:
   result.text = @"Heads";
   break;
  case 1:
   result.text = @"Tails";
   break;
  default:
   break;
}
}

- (IBAction)leftCenterRight {
   int rNumber = rand() % 3;

switch (rNumber) {
  case 0:
   result.text = @"Left";
   break;
  case 1:
   result.text = @"Center";
   break;
  case 2:
   result.text = @"Right";
   break;
  default:
   break;
}
}

- (IBAction)lottery {
int rNumber = rand() % 3;

switch (rNumber) {
  case 0:
   result.text = @"Buy";
   break;
  case 1:
   result.text = @"Sell";
   break;
  case 2:
   result.text = @"Hold";
   break;
  default:
   break;
}
}

- (IBAction)oneToHundred {
int rNumber = rand() % 100;
result.text = [[NSString alloc] initWithFormat:@"%d", rNumber];
}

- (IBAction)positiveNegative {
int rNumber = rand() % 2;

switch (rNumber) {
  case 0:
   result.text = @"Positive";
   break;
  case 1:
   result.text = @"Negative";
   break;
  default:
   break;
}
}

- (IBAction)russianRoulette {
int rNumber = rand() % 6;

switch (rNumber) {
  case 0:
   result.text = @"BANG!!!";
   break;
  default:
   result.text = @"Click...";
   break;
}
}

- (IBAction)trueFalse {
int rNumber = rand() % 2;

switch (rNumber) {
  case 0:
   result.text = @"True";
   break;
  case 1:
   result.text = @"False";
   break;
  default:
   break;
}
}

- (IBAction)yesNo {
int rNumber = rand() % 2;

switch (rNumber) {
  case 0:
   result.text = @"Yes";
   break;
  case 1:
   result.text = @"No";
   break;
  default:
   break;
}
}

@end

(3) UIView 界面设置

双击文件： "main.xib" ；
然后 "Interface Builder" 会自动打开，在这里我们可以编辑改变界面

(4) 加入Label 在 Attributes 下, 调整合适的大小

选择: Tools -> Connection Inspector
移动鼠标在"Referencing Outlets" 后面圆圈上; 圆圈变为(+); 拖向直线连接到"Main View";
放开鼠标选择键出现 "result"; 选上它。

(5) 加入 Button ; 显示:Yes/No