//

//  main.m

//  Hello

//

//  Created by lishujun on 14-8-28.

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

//

#import <UIKit/UIKit.h>

// 视图控制器对象

@interface HelloWorldViewController : UIViewController

@property (nonatomic, retain) IBOutlet UITextField *textField;

@end

@implementation HelloWorldViewController

-(void) loadView

{

    // 创建视图对象

    UIView *contentView = [[UIView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];

    contentView.backgroundColor = [UIColor lightGrayColor];

    self.view = contentView;

    // 创建文本框

    self.textField = [[UITextField alloc]initWithFrame:CGRectMake(, , 97.0, 31.0)];

    self.textField.borderStyle = UITextBorderStyleRoundedRect;

    self.textField.keyboardType = UIKeyboardTypeNamePhonePad;

    self.textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    [contentView addSubview:self.textField];

    // 创建按钮

    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0.0, 0.0, 320.0, 30.0)];

    [button setTitle:NSLocalizedString(@"Hello", nil) forState:UIControlStateNormal];

    button.center = contentView.center;

    [contentView addSubview:button];

    // 绑定按钮事件

    [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

}

-(void) buttonClicked:(UIButton *)button

{

    // 方法1：从视图层次里获取文本框中文字

    NSLog(@"button clicked...");

    UITextField *textField = [self.view subviews][];

    NSLog(@"hello, %@", textField.text);

    // 方法2：把textField从局部变量变更为类属性

    NSLog(@"hello, %@", self.textField.text);

    //用对话框弹出信息

    UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Hello"

        message:self.textField.text delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

    [av show];

}

@end

// 委托对象

@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate>

{

    IBOutlet UIWindow *window;

}

@property (nonatomic, retain) UIWindow *window;

@property (nonatomic, retain) HelloWorldViewController *viewController;

//window 必须声明为属性,声明为局部变量则无法绘制视图，显示为黑屏

//apple 官方文档把viewController也声明为属性了

@end

@implementation HelloWorldAppDelegate

@synthesize window;

@synthesize viewController;

-(void) applicationDidFinishLaunching:(UIApplication *)application

{

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

    self.viewController = [[HelloWorldViewController alloc]init];

    self.window.rootViewController = self.viewController;

    [self.window makeKeyAndVisible];

}

@end

// 程序入口

int main(int argc, char * argv[])

{

    @autoreleasepool {

        return UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");

    }

}