我的iphone开发学习笔记(五): 使用UIAlertView、声音播放来提示警告

今天练习的内容是：

使用UIAlertView生成警告

利用系统来播放声音警告；

练习步骤：

1. 创建view_base_application, 项目名称为GettingAttention

2. 打开GettingAlertViewController.h

    声明UILabel statusMessage

    声明:    

-(IBAction)doAlert:(id)sender;

-(IBAction)doActionSheet:(id)sender;

-(IBAction)doSound:(id)sender;

-(IBAction)doAlertSound:(id)sender;

-(IBAction)doVibrate:(id)sender;

3. 负责函数和File's Owner连接

    安装具体的UI, 按住control，连线到File's Owner, 选择正确的处理函数，

    

4。

      4. 1完成doAlert:(id)sender

      主要思路就是初始化uialertView, uialerView show, uialertView release

      4.2 doActionSheet:(id)sender       

            UIAlertView *alert = [[UIAlertViewalloc]initWithTitle:@"doActionSheet"message:@"doActionSheet"delegate:selfcancelButtonTitle:@"ok"otherButtonTitles:@"Maybe later",@"Never",nil];

[alert show];

[alert release];

           基本步骤和相同，区别在与otherButtonTitles:@"",@"",nil

     4.3  doSound:(id)sender; 

            首先导入import AudioToolBox.frame框架

            然后import <AudioToolbox/AudioToolbox.h>

            

SystemSoundID soundId;
NSString *soundFlie = [[NSBundle mainBundle]pathForResource:@"alertsound" ofType:@"wav"];
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:soundFlie], &soundId);
AudioServicesPlayAlertSound(soundId)；

4.4 doVibrate:(id)sender的方法

      这个比较简单，直接调用方法AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

整个实例相对简单，主要复杂点在于如何调用AudioToolbox框架来播放系统声音

详细代码如下

//
//  GettingAlertViewController.h
//  GettingAlert
//
//  Created by 旭 陈 on 11-12-4.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

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

@interface GettingAlertViewController : UIViewController<UIAlertViewDelegate> {

	IBOutlet UILabel *statusMessage;
}

@property(nonatomic,retain)IBOutlet UILabel *statusMessage;


-(IBAction)doAlert:(id)sender;
-(IBAction)doActionSheet:(id)sender;
-(IBAction)doSound:(id)sender;
-(IBAction)doAlertSound:(id)sender;
-(IBAction)doVibrate:(id)sender;


@end

//
//  GettingAlertViewController.m
//  GettingAlert
//
//  Created by 旭 陈 on 11-12-4.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "GettingAlertViewController.h"

@implementation GettingAlertViewController

@synthesize statusMessage;

/*
 // The designated initializer. Override to perform setup that is required before the view is loaded.
 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
 if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
 // Custom initialization
 }
 return self;
 }
 */

/*
 // Implement loadView to create a view hierarchy programmatically, without using a nib.
 - (void)loadView {
 }
 */


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


/*
 // Override to allow orientations other than the default portrait orientation.
 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
 // Return YES for supported orientations
 return (interfaceOrientation == UIInterfaceOrientationPortrait);
 }
 */

- (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.
}

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


- (void)dealloc {
    [super dealloc];
}
-(IBAction)doAlert:(id)sender{
	UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"title" message:@"message" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
	[alert show];
	[alert release]; 
}

-(IBAction)doActionSheet:(id)sender{
	UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"doActionSheet" message:@"doActionSheet" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:@"Maybe later",@"Never",nil];
	[alert show];
	[alert release];

}

-(IBAction)doSound:(id)sender{
	SystemSoundID soundId;
	NSString *soundFlie = [[NSBundle mainBundle]pathForResource:@"alertsound" ofType:@"wav"];
	AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:soundFlie], &soundId);
	AudioServicesPlayAlertSound(soundId);
}

-(IBAction)doAlertSound:(id)sender{
	SystemSoundID soundId;
	NSString *soundFile = [[NSBundle mainBundle] pathForResource:@"soundeffect" ofType:@"wav"];
	AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:soundFile], &soundId);
	AudioServicesPlayAlertSound(soundId);
}

-(IBAction)doVibrate:(id)sender{
	AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
	
}

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
	NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
	if ([title isEqualToString:@"Maybe later"]) {
		statusMessage.text = @"Maybe Later";
	}else if ([title isEqualToString:@"Never"]) {
		statusMessage.text = @"Never";
	}
}

@end

声明：

1。上述例子代码来源于书籍<<Iphone开发入门经典>>，经过本人的实际练习通过。

2。 需要本例子代码的童鞋，请留下电子邮件。