IOS研究院之应用程序第一个项目HelloWorld（一）

#import <UIKit/UIKit.h>

int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    int retVal = UIApplicationMain(argc, argv, nil, nil);
    [pool release];
    return retVal;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    //创建label视图
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 200, 30)];
    //设置显示内容
    label.text = @"雨松MOMO的程序世界";
    //设置背景颜色
    label.backgroundColor = [UIColor blueColor];
    //设置文字颜色
    label.textColor = [UIColor whiteColor];
    //设置显示位置居中
    label.textAlignment = UITextAlignmentCenter;
    //设置字体大小
    label.font = [UIFont fontWithName:[[UIFont familyNames] objectAtIndex:10] size:20];
    //将label添加到显示视图中
    [self.view addSubview:label]; 

    //释放对象
    [label release];
}

    #import <UIKit/UIKit.h> 

    @interface HelloWorldViewController : UIViewController
    {
        //定义了一个按钮buttonA
        IBOutlet UIButton *buttonA;
        //定义了一个按钮buttonB
        UIButton *buttonB; 

    }
    //声明A按钮被按下的一个方法(IBAction) 相当于(void)
    -(IBAction)bttonPressed:(id)obj;     

    -(void)showDialog;
    @end

    - (void)bttonPressed:(id)obj
    {
        [self showDialog]; 

    }   

    -(void)showDialog
    { 

        //这里说一下nil  这个东西就好比java 语言中的 null
        UIAlertView * alertA= [[UIAlertView alloc] initWithTitle:@"我的视图" message:@"点开了弹出对话框" delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];
        //objectiveC开发中调用方法是用"[]" 例如: [alertA addButtonWithTitle:@"取消"];
        //如果是为方法赋值则类似java 对象.成员 例如 :textFieldA.text
        //添加了一个取消按钮
        [alertA addButtonWithTitle:@"取消"];
        //将这个UIAlerView 显示出来
        [alertA show];
        //objective-C 不像java 有自己的垃圾回收机制 所以我们在编写程序中一定要注意释放内存 从一开始就养成良好习惯
        [alertA release];
    }

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;  

    //在这里将按钮对象释放掉
    [self.buttonA release];
    [self.buttonB release];
}

//
//  HelloWorldViewController.m
//  HelloWorld
//
//  Created by  雨松MOMO on 11-9-30.
//  Copyright 2011年 __MyCompanyName__. All rights reserved.
//

#import "HelloWorldViewController.h"

@implementation HelloWorldViewController

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];

    //创建label视图
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 200, 30)];
    //设置显示内容
    label.text = @"雨松MOMO的程序世界";
    //设置背景颜色
    label.backgroundColor = [UIColor blueColor];
    //设置文字颜色
    label.textColor = [UIColor whiteColor];
    //设置显示位置居中
    label.textAlignment = UITextAlignmentCenter;
    //设置字体大小
    label.font = [UIFont fontWithName:[[UIFont familyNames] objectAtIndex:10] size:20];
    //将label添加到显示视图中
    [self.view addSubview:label]; 

    //释放对象
    [label release];

    //创建按钮
    buttonB = [UIButton buttonWithType:1];
    //设置按钮范围
    buttonB.frame = CGRectMake(100, 250, 150, 30);
    //设置按钮显示内容
    [buttonB setTitle:@"代码添加按钮" forState:UIControlStateNormal];
    //设置按钮改变后 绑定响应方法
    [buttonB addTarget:self action:@selector(showDialog) forControlEvents:UIControlEventTouchUpInside]; 

    //将label添加到显示视图中
    [self.view addSubview:buttonB]; 

}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;

    //在这里将按钮对象释放掉
    [buttonA release];
    [buttonB release];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)bttonPressed:(id)obj
{
    [self showDialog];

}  

-(void)showDialog
{

    //这里说一下nil  这个东西就好比java 语言中的 null
    UIAlertView * alertA= [[UIAlertView alloc] initWithTitle:@"我的视图" message:@"点开了弹出对话框" delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];
    //objectiveC开发中调用方法是用"[]" 例如: [alertA addButtonWithTitle:@"取消"];
    //如果是为方法赋值则类似java 对象.成员 例如 :textFieldA.text
    //添加了一个取消按钮
    [alertA addButtonWithTitle:@"取消"];
    //将这个UIAlerView 显示出来
    [alertA show];
    //objective-C 不像java 有自己的垃圾回收机制 所以我们在编写程序中一定要注意释放内存 从一开始就养成良好习惯
    [alertA release];
}

@end