IPhone Dev Notes - 1 - 基本控件使用

参照IPhone4 基础开发教程第四章：更丰富的用户界面

XCode版本：4.0.2

//

//  test04ViewController.h

//  test04

//

//  Created by lily on 12-1-27.

//  Copyright 2012年 lily. All rights reserved.

//

#import<UIKit/UIKit.h>

#define kSwithesSegmentIndex 0

@interface test04ViewController :UIViewController <UIActionSheetDelegate>{

//以下部分是指向实例的变量

    UITextField *nameField;

    UITextField *numberField;

    UILabel *sliderLabel;

    UISwitch *leftSwitch;

    UISwitch *rightSwitch;

    UIButton *doSomethingButton;    

}

//声明的IBOutlet的属性，该属性用于连接Interface Builder中的控件

//再次声明的属性，需要在对应的.m文件中，声明为@synthesis

@property (nonatomic,retain)IBOutletUITextField *nameField;

@property (nonatomic,retain)IBOutletUITextField *numberField;

@property (nonatomic,retain)IBOutletUILabel *sliderLabel;

@property (nonatomic,retain)IBOutletUISwitch *leftSwitch;

@property (nonatomic,retain)IBOutletUISwitch *rightSwitch;

@property (nonatomic,retain)IBOutletUIButton *doSomethingButton;

//以IBAction开始的是连接输入口， 将Interface Builder中的控件的事件连接到这些操作上，可以引发响应的操作

- (IBAction)textFieldDoneEditing:(id)sender;

- (IBAction)backgroundTap:(id)sender;

- (IBAction)sliderChanged:(id)sender;

- (IBAction)toggleControls:(id)sender;

- (IBAction)switchChanged:(id)sender;

- (IBAction)buttonPressed;

//actionSheet操作表用于在IPhone下放弹出警告信息

//要使该操作有效需要时当前的ViewController实现<UIActionSheetDelegate>协议

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex;

@end

//

//  test04ViewController.m

//  test04

//

//  Created by lily on 12-1-27.

//  Copyright 2012年 lily. All rights reserved.

//

#import"test04ViewController.h"

@implementation test04ViewController

//对应头文件.h中的属性@property申明

@synthesize nameField;

@synthesize numberField;

@synthesize sliderLabel;

@synthesize leftSwitch;

@synthesize rightSwitch;

@synthesize doSomethingButton; 

//在TextField控件的检查器中如果回车键改为Done键后，可以在事件中找到Did End On Exit

//将改事件连接到此操作，即可在键盘按下Done键后关闭键盘

- (IBAction)textFieldDoneEditing:(id)sender{

//关闭键盘的方法实际上是注销当前的TextField控件为第一响应者。

    [senderresignFirstResponder];

}

//在键盘没有Done键功能的情况下，实现触摸背景空白处，关闭键盘的功能

//

- (IBAction)backgroundTap:(id)sender{

//注销所有TextField为第一响应者

    [nameFieldresignFirstResponder];

    [numberFieldresignFirstResponder];

}

//Slider移动时触发此操作，触发事件为Value Changed。

- (IBAction)sliderChanged:(id)sender{

    //通过sender获取Slider的值

    UISlider *slider = (UISlider *)sender;

    int progressAsInt = (int)(slider.value +0.5);

    NSString *newText = [[NSString alloc] initWithFormat:@"%d", progressAsInt];

    sliderLabel.text = newText;

    //由于alloc了新的String，所以再结束时需要对其释放。

    [newText release];

}

//Segmented Control控件触发的操作，触发事件为Value Changed

- (IBAction)toggleControls:(id)sender{

   //kSwithcesSegmentIndex是个define常量，在.h文件中定义如下：

   //#define kSwithesSegmentIndex 0

   //目的是判断按下了Segment Control控件中的第几个键。

    if([sender selectedSegmentIndex] == kSwithesSegmentIndex){

   //hidden变量用于控制控件是否显示在屏幕上

        leftSwitch.hidden = NO;

        rightSwitch.hidden = NO;

       doSomethingButton.hidden =YES;

    }

    else{

        leftSwitch.hidden = YES;

        rightSwitch.hidden = YES;

       doSomethingButton.hidden =NO;

    }

}

//Switch 控件触发的操作，触发事件为Value Changed

- (IBAction)switchChanged:(id)sender{

    //获取传进来的Switch控件的值

    UISwitch *whichSwitch = (UISwitch *)sender;

    BOOL setting = whichSwitch.isOn;

    //将左右2个Switch控件都修改为我们得到的输入值

    [leftSwitchsetOn:settinganimated:YES];

    [rightSwitchsetOn:settinganimated:YES];

}

//Button 控件触发的操作，触发事件为Touch Up Inside

- (IBAction)buttonPressed{

   /*创建ActionSheet

   initWithTile: 操作表的标题

   delegate: 指定操作表的代理，表示处理的实例对象为自己即test04ViewController，实际上将处理指派给了(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex操作函数

   cancelButtonTitle：撤销按钮的标题

   destructiveButtonTitle： 确认按钮的标题

   otherButtonTitles：其他按钮标题，为NSString Array，以nil作为结束*/

   UIActionSheet *actionSheet = [[UIActionSheetalloc] 

                                 initWithTitle:@"Are you sure?" 

                                 delegate:self

                                 cancelButtonTitle:@"No Way!" 

                                 destructiveButtonTitle:@"Yes, I'm Sure!" 

                                 otherButtonTitles:nil];

    //显示ActionSheet， showInView指定显示的父视图

    [actionSheet showInView:self.view];

    //alloc后需要对actionSheet对象进行释放

    [actionSheet release];

}

//对 <UIActionSheetDelegate>实现，和实际actionSheet操作的实现

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{

   //判断是否为撤销按钮, 如果不是则执行子程序

    if(buttonIndex != [actionSheet cancelButtonIndex])

    {

        NSString *msg = nil;

        if(nameField.text.length >0)

            msg = [[NSStringalloc]initWithFormat:@"You can breathe easy, %@, everything went OK. ",nameField.text];

        else    

            msg =@"You can breathe easy, everything went OK. ";

        //警告视图初始化，和actionSheet的初始化雷同，只是警告视图是出现在IPhone屏幕中间的警告窗口而已

        UIAlertView *alert = [[UIAlertView alloc] 

                             initWithTitle:@"Something was done" 

                             message:msg 

                             delegate:self 

                             cancelButtonTitle:@"Phew!" 

                             otherButtonTitles:nil];   

        //警告视图的显示不需要指定父视图

        [alert show];

        //释放alert对象

        [alert release];

        //释放msg对象

        [msg release];

    }       

}

- (void)dealloc

{   

    //对所有的声明的对象进行释放

    [nameFieldrelease];

    [numberFieldrelease];

    [sliderLabelrelease];

    [leftSwitchrelease];

    [rightSwitchrelease];

    [doSomethingButtonrelease];

    [superdealloc];

}

- (void)didReceiveMemoryWarning

{

   // Releases the view if it doesn't have a superview.

    [superdidReceiveMemoryWarning];

    

   // 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.

// 在viewLoad结束后对视图进行修改

- (void)viewDidLoad

{

    //载入图像whiteButton.png, 该图像已经被实现导入到工程中

    UIImage *buttonImageNormal = [UIImage imageNamed:@"whiteButton.png"];

    //设置图像为可拉伸图像，左右不可拉伸像素为12px， 上下不可拉升像素为0px

    UIImage *strechableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];

    //设置按钮在普通状态下显示为whiteButton.png图像

    [doSomethingButtonsetBackgroundImage:strechableButtonImageNormalforState:UIControlStateNormal];

    UIImage *buttonImagePressed = [UIImage imageNamed:@"blueButton.png"];

    UIImage *strechableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];

    //设置按钮在高显状态下，即按钮被按下的状态下，显示为blueButton.png图像

    [doSomethingButtonsetBackgroundImage:strechableButtonImagePressedforState:UIControlStateHighlighted];

   //[super viewDidLoad];

}

- (void)viewDidUnload

{

   //在图像被卸载时，将所有的对象声明为nil

   //在多视图应用中，需要尤其注意，执行此操作

   self.numberField =nil;

   self.numberField =nil;

   self.sliderLabel =nil;

   self.leftSwitch =nil;

   self.rightSwitch =nil;

   self.doSomethingButton =nil;

    [superviewDidUnload];

   // Release any retained subviews of the main view.

   // e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

   // Return YES for supported orientations

    return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end